Mattia Bonsignori, MD

• Associate Professor in Medicine
• Member of the Duke Human Vaccine Institute

https://medicine.duke.edu/faculty/mattia-bonsignori-md

To prevent microbes from invading the intestine heart attack sam tsui chrissy costanza buy generic hytrin canada, several defense mechanisms arrhythmia nursing diagnosis generic hytrin 2 mg with visa, such as the epithelial cells themselves hypertension quizlet 1 mg hytrin buy fast delivery, which are tightly connected through junction proteins blood pressure norms chart cheap hytrin 1 mg buy on line, the maintenance of a mucous layer consisting of mucin glycoproteins wide pulse pressure icd 9 code cheap hytrin 5 mg line, the production of antimicrobial peptides such as defensins, cathelicidins, and C-type lectins (Hooper, 2009) and IgA-mediated inhibition of bacterial translocation all play a role. Under normal conditions, the microbiota is in homeostasis with the host and has evolved a mutualistic relationship permanently interacting with each other but not inducing excessive inflammatory responses leading to pathological conditions. Balanced microbiota contains symbionts that are beneficial to the host, commensals that are permanent residents but neither harmful nor beneficial to the host, as well as pathobionts that are potentially harmful (Compare and Nardone, 2011). The microbiota exerts diverse functions adding to the maintenance of mucosal homeostasis, such as competing with pathogens for nutrients and adherence site and thereby protecting against pathogens, triggering the production of antimicrobial factors, actively attenuating epithelial proinflammatory immune responses, helping with energetic metabolism to deliver nutrients to the intestinal epithelia, thereby promoting intestinal barrier function, proliferation, and survival of intestinal epithelial cells, producing vitamins and metabolizing toxic substances, shaping the specificity of IgA, and maintaining the mucous layer (Compare and Nardone, 2011). Pathogens have evolved different mechanisms to undermine the intestinal defense mechanism, to manipulate and evade host immune response and translocate the epithelial barrier. In contrast to the pathogenesis of colorectal cancer, the function of the microbiota in inflammatory bowel disease is elucidated more thoroughly (Brenchley and Douek, 2012). The close proximity of the intestinal microbiota to colorectal cancers and the fact that gene defects associated with the development of intestinal tumors leading to disturbed barrier integrity introduce the intestinal microbes as new players triggering inflammation and promoting colorectal carcinogenesis. A well-known connection between bacteria and colorectal cancer pathogenesis is the Helicobacter pylori infection, which is associated with enhanced risk for gastric cancer and mucosa-associated lymphoid tissue lymphoma (Compare and Nardone, 2011). Other associations between bacteria and cancer are Salmonella typhii with gallbladder cancer and Chlamydia pneumoniae with lung cancer. The first description that bacteria contribute to the pathogenesis of colorectal cancer were made in germ-free mice in the ApcMin model. There are also studies describing a dysbiosis of the microbiota in colorectal cancer patients (Sobhani et al. A recent study indicated that a Th17 signature in human colorectal cancer is associated with a poor prognosis even for early-stage disease, and a Th1 signature is more favorable (Tosolini et al. The basis for this difference is not known yet, but may be associated with the microbiome (Gallimore and Godkin, 2013) of the cancer patient, and it is already known that certain bacteria favor a Th17 response (Hooper et al. Many mouse models for colorectal cancer are established and can be grouped into genetically-engineered, chemically-induced, and inoculated mouse models. As none of these models recapitulate the pathogenesis of colorectal cancer entirely, it is a very critical step to choose the right model for the specific question that should be answered. ApcMin Mouse Model the ApcMin mouse model is the pioneer model for colorectal cancer. The resulting breakdown of mucosal epithelial barrier function allows the entry of luminal antigens and microorganisms into the mucosa, leading to an inflammatory responses (Perse and Cerar, 2012). These infiltrating lymphocytes collectively promote an orchestrated wound healing response. It is supposed that oxazolone induces a T-cellmediated response against hapten-modified autologous proteins and luminal antigens (Wirtz et al. It is also used in rodent models of delayed type hypersensitivity and for testing chemicals and drugs for their sensitizing potential. It is characterized by a rapidly developing colitis confined to the distal half of the colon, with superficial inflammation with lymphocyte infiltrates, epithelial cell loss, regenerative epithelium, depletion of goblet cells, and patchy ulcerations. In addition, epithelial­mesenchymal transition is induced, facilitating metastasis. However, whereas some of these mice develop more colonic lesions than ApcMin mice, mice with constitutional Apc mutations develop predominantly small intestinal tumors. In contrast to other known colorectal cancer models, a fraction of these tumors are invasive and progressed through all intestinal layers. However, there is still a lot of research necessary to understand the pathogenesis of colorectal cancer and the underlying inflammatory responses in the tumor microenvironment. The treatment for colitis-associated cancer includes mainly surgical resection as well as radio- and chemotherapy. Prospective anti-inflammatory drugs might be promising to reduce the development of colitis-associated cancer. Overview of molecular pathways in inflammatory bowel disease associated with colorectal cancer development. Oxazolone colitis: a murine model of T helper cell type 2 colitis treatable with antibodies to interleukin 4. A novel mouse model of inflammatory bowel disease links mammalian target of rapamycin-dependent hyperproliferation of colonic epithelium to inflammation-associated tumorigenesis. Intestinal neoplasia in the ApcMin mouse: independence from the microbial and natural killer (beige locus) status. Colitis-associated colorectal cancer driven by T-bet deficiency in dendritic cells. Qualitative and quantitative analyses of the bifidobacterial microbiota in the colonic mucosa of patients with colorectal cancer, diverticulitis and inflammatory bowel disease. Mouse model of colonic adenoma-carcinoma progression based on somatic Apc inactivation. Induction of inflammatory bowel disease accelerates adenoma formation in Min +/- mice. Lack of interferon-gamma production despite the presence of interleukin-18 during cutaneous wound healing. Targeted inhibition of Stat3 with a decoy oligonucleotide abrogates head and neck cancer cell growth. A dominant mutation that predisposes to multiple intestinal neoplasia in the mouse. Nuclear factor kappaB is activated in macrophages and epithelial cells of inflamed intestinal mucosa. MyD88-mediated signaling prevents development of adenocarcinomas of the colon: role of interleukin 18. Loss of p53 in enterocytes generates an inflammatory microenvironment enabling invasion and lymph node metastasis of carcinogen-induced colorectal tumors. Molecular characterization of mucosal adherent bacteria and associations with colorectal adenomas. Interleukin 18 is a primary mediator of the inflammation associated with dextran sulphate sodium induced colitis: blocking interleukin 18 attenuates intestinal damage. Frequent mutations of the beta-catenin gene in mouse colon tumors induced by azoxymethane. Enhanced Th1 activity and development of chronic enterocolitis in mice devoid of Stat3 in macrophages and neutrophils. A novel inflammation-related mouse colon carcinogenesis model induced by azoxymethane and dextran sodium sulfate. Clinical impact of different classes of infiltrating T cytotoxic and helper cells (Th1, th2, treg, th17) in patients with colorectal cancer. High-throughput clone library analysis of the mucosa-associated microbiota reveals dysbiosis and differences between inflamed and non-inflamed regions of the intestine in inflammatory bowel disease. Chapter 92 Overview: Mucosal Immunity and Disease of the Respiratory Tract Bart N. There is also frequent exposure to air pollutants in the form of ambient particulate matter and gaseous substances. At the same time, the lung is a very delicate organ that is crucial for gas exchange. The gas exchange of the lung occurs at the alveolocapillary membrane, which is very thin and consists of a shared basement membrane of endothelial cells lining the capillaries and the alveolar epithelial cells. Entry into the bloodstream via this delicate membrane is very easy; therefore, defense mechanisms should be mounted quickly. However, gas exchange would be immediately compromised if an overzealous inflammatory immune response would be mounted. A common characteristic of pulmonary mucosal immunity is the rapid clearance of inhaled antigen. For a long time, the deeper lung was therefore thought to be a virtually sterile environment. However, we now realize that there is a microbiome in the lung that is influenced by health and disease and by lifestyle factors such as smoking and obesity. As will be clear from Chapters 93­98 on lung immunity, the effect of this microbiome on the initiation and progression of respiratory immunity and disease is only beginning to be appreciated. In the last decade, there has been an explosion of research on the intimate interplay of respiratory epithelial cells of the conducting airways and the alveolar compartment on the functioning of the mucosal immune system of the lung. Initially, the lung epithelium was merely seen as a physical barrier, Mucosal Immunology. However, we now realize that all along the respiratory tract epithelial lining cells make a great impact on the initiation, persistence, and resolution of airway mucosal immune responses. Airway epithelial cells make the cytokines that prime the initiation of innate immunity, and they make the cytokines and growth factors that lead to resolution of mucosal injury (also see Chapter 29 for greater detail on how lung epithelial cells control pulmonary immunity). The lung is a frequent portal of entry for respiratory viruses, as described in Chapter 94. Crossprotective T cells and B cell-derived neutralizing antibodies offer the prospect of protection against future pandemic outbreaks. Infection in infants can be devastating and lead to long-term changes in lung growth in the first years of life. This might be due to latent infection with adenovirus or to an ongoing autoimmune response induced by smoking. Mycobacterium tuberculosis has been infecting humans and has been a major cause of death for as long as there have been humans on the planet (Chapter 95). The formation of the primary Ghon complex (a peripheral alveolitis combined with a lesion in the draining hilar or mediastinal lymph node) has been shown to be caused by migration of infected dendritic cells that take the mycobacterium to the nodes. We also realize now that diseases that interfere with the development of Th1 immunity. The evolutionary pressure by Mycobacteria has enormously shaped our immune response, and inactivated Mycobacteria or mycobacterial products might also be exploited for re-educating the immune system of children growing up in Western affluent societies. Maybe the best studied disease of the lungs that affects 300 million people worldwide is asthma. Asthma has been long regarded as the prototypical Th2 disease of the lungs, separated into an allergic and nonallergic form. As shown in Chapters 93 and 96, we now know a lot about the mechanisms that drive bronchial hyper-responsiveness and allergic-type inflammation, mainly from animal studies (Chapter 93); carefully designed clinical studies (Chapter 96); and work with ex vivo analysis of lung cells, lung epithelial cells, and smooth muscle cells. There has been a real paradigm shift in the way that asthma is regarded, and asthma is increasingly seen as a syndrome rather than a single disease. Distinct asthma endotypes are phenotypic variants of the disease that differ in genetic risk, environmental risk factors, age of onset, sex, prognosis, and response to corticosteroid therapy (Anderson, 2008). Some forms of the disease are clearly characterized by a Th2 cytokine signature, causing eosinophil-rich inflammation. The latter variant of the disease is typically seen in nonatopic asthmatic elderly women that also suffer from chronic rhinosinusitis (described in greater detail in Chapter 100). Some forms of asthma are characterized by neutrophilic inflammation (most likely driven by a Th17 response), and again these patients are resistant to steroids. The major risk factor for this disease is smoking or in-house air pollution from cooking on wood fires. In terms of immunology, the disease has not been as extensively studied as asthma. In bronchiectasis (widening of the bronchi), repeated injury and repair lead to dilatation of the bronchi, impaired mucociliary clearance, and stasis of mucus, often leading to colonization with Staphylococcus aureus and Pseudomonas species. A better understanding of the mucosal immune response underlying the health and disease of the lung will hopefully lead to better therapies in the future. Endotyping asthma: new insights into key pathogenic mechanisms in a complex, heterogeneous disease. Eosinophils in the spotlight: Eosinophilic airway inflammation in nonallergic asthma. Mycobacterium bovis Bacillus Calmette-Guerin killed by extended freeze-drying reduces colitis in mice. Over the past few decades, the incidence of asthma has dramatically increased with over 300 million worldwide suffering from this debilitating disease. Despite extensive investigation, the mechanisms underlying the pathogenesis of this disease still remain unclear. Consequently, the development of new treatments for asthma has not kept pace with the rise in disease incidence. Exploration of the factors that predispose to , initiate, or perpetuate allergic inflammation in humans has been hampered by the complex etiology of the disease, variability in disease expression, and ethical concerns related to the procurement of relevant tissues for study. Thus, animal models of allergic asthma have been widely used to identify the underlying mechanisms of the disease and to inform the development of new therapeutic strategies for the treatment of this debilitating disease. However, the limited efficacy of new biologic therapies aimed at suppressing Th2 cytokines has raised the question as to whether the current models are Mucosal Immunology. Recent unbiased cluster analyses in human asthmatics have highlighted the heterogeneity of the disease and identified specific "endotypes" of the disease that may not be addressed in current models, thus highlighting the need for a generation of new models with which to address the entire spectrum of the disease (Haldar et al. In this chapter, we will review the salient pathophysiological and immune characteristics of the currently utilized models, the advantages and limitations of their use in exploring the pathogenic mechanisms of the disease, the insights into disease pathogenesis gained from the use of these models to date, and the need for the development of new models of the disease that reflect the heterogeneity of human disease. Although the etiology of asthma is unknown, both genetic and environmental factors are known to contribute to the development of the disease. Based on the association of disease with IgE-mediated processes, it has been hypothesized that disease is the result of the development of aberrant immune responses to commonly inhaled allergens in genetically susceptible individuals. The elaboration of Th2 cell cytokines sets into motion a series of events leading to IgE production and recruitment and activation of a variety of downstream effector cells such as mast cells, eosinophils, basophils, and effector T cells. Repeated exposures of sensitized individuals with offending allergens also result in structural changes in the airway wall such as epithelial cell metaplasia, smooth muscle layer thickening, and subepithelial fibrosis. In general, the Th2-low cluster is associated with more severe disease characteristics (nonatopic, neutrophilic inflammation, obesity, lack of bronchodilator reversibility) and resistance to corticosteroid treatment.

Comparison of the distribution of IgA1- and IgA2-producing cells in various human lymphoid and mucosal tissues (Chapters 17 and 32); (Mestecky and Russell hypertension patho cheap hytrin online master card, 1986) indicates that blood pressure cuff size 1 mg hytrin purchase with amex, in this respect blood pressure chart log hytrin 1 mg purchase line, the female genital tract strongly resembles the lower intestinal tract but differs markedly from other tissues blood pressure zero gravity discount hytrin 5 mg with mastercard. The mechanisms involved in regulation of the distribution of IgA1- or IgA2-producing cells are at present unknown; however arrhythmia ecg cheap generic hytrin canada, in addition to various cytokines that may profoundly influence the expression of Ig isotypes (Mcghee et al. Although cytoplasmic IgA-positive cells do not differ morphologically in the various tissues, the molecular properties of the IgA secreted, for example, by cells in the bone marrow versus the properties of IgA secreted by those in the gut, differ with respect to IgA subclass and polypeptide chain composition (Chapter 17). With the exception of the large intestine, in which IgA2-containing cells predominate, cytoplasmic IgA1-positive cells are more frequent in all tissues studied (Crago et al. In addition to the differences in IgA subclasses, IgA-containing cells present in various human tissues release IgA that differs in molecular form. Most if not all of the IgA secreted by cells in the bone marrow is in the monomeric form. In contrast, IgA produced by cells from the cervix is released predominantly in the polymeric form, having two or more monomers plus J chain linked by disulfide bonds (Kutteh et al. Analyses of isolated mononuclear cells revealed the dominance of IgG- over IgA- or IgMsecreting cells, and a slight preponderance of IgA1- over IgA2-secreting cells. The origin and mechanisms involved in the homing and local differentiation of dominant IgG-producing cell population in the uterine endocervix have not been clarified. Currently, Th1, Th2, Th17, and regulatory T cells (Treg) subsets have been identified (Zhu et al. Treg facilitate immune tolerance by regulating Th1, Th2, and Th17 immune responses. In fertile nonpregnant women, Treg numbers are increased in the late follicular phase and decreased during the luteal phase. The geometric mean for secretory samples was statistically significant with the Student t-test compared with data from either proliferative or inactive uterine endometrial samples (p < 0. Mucosal Immunity in the Human Female Reproductive Tract Chapter 108 2103 activity was either low or undetectable during the secretory stage of the cycle when estradiol and progesterone are elevated in blood. The reproductive tract contains both resident cells and cells that migrate into the female reproductive tract that are able to present antigen to T cells. Distributed primarily between the epithelial and myometrial layers, macrophages are found both scattered throughout the Fallopian tubes, cervix, and vagina and in small aggregates in the uterus (Bonatz et al. Sex hormones regulate macrophage numbers in the endometrium, with an increase before menstruation, whereas vaginal macrophages remain constant throughout the menstrual cycle (Starkey et al. Antigen presentation was demonstrated in both proliferative and secretory stages, as well as in postmenopausal uteri. Whether antigen presentation in the human uterus and vagina is hormonally dependent, as has been previously demonstrated in rodents (Chapter 99), remains to be determined. With the growing interest in vaccines to enhance mucosal immune responses, these findings suggest that potential pathogens or vaccines present in the reproductive tract may be important determinants in eliciting immune protection. Lymphoid Aggregates in Human Uterine Endometrium Discrete lymphoid aggregates (follicles) in the uterine endometrium have been recognized by histopathologists for many years (as reviewed in Dahlenbach-Hellweg, 1975) and were thought to occur in response to infection. It is now apparent that these structures represent an organization of immune cells that are not dependent on the presence of infection or malignancy. To examine the relationship between immune cells and aggregates in the uterus, Yeaman et al. These aggregates were oval in shape and located between glands in the functionalis region of the uterus. Lymphoid aggregates were composed of a B-cell core surrounded by T cells and an outer halo of macrophages. The size of lymphoid aggregates was found to vary with the stage of the menstrual cycle (Yeaman et al. The change in size correlates with the stage of the menstrual cycle from the early proliferative to the secretory phase. The absence of aggregates in uteri from postmenopausal women provided further evidence that these aggregates are under hormonal control. The expanding concentric rings represent estradiol released at mid-cycle along with progesterone released during the secretory stage of the menstrual cycle. Estradiol and P4 act both directly and indirectly through growth factors and cytokines to selectively suppress and/or enhance immune parameters including immune cell migration, cytotoxic T-cell activity, coreceptor expression, antibody and antimicrobial production, and innate immune cell function. Expanding concentric rings depict the release of estradiol at mid-cycle along with progesterone released during the secretory phase of the cycle. Interestingly, the specific distribution and regulation of these chemokine receptors in the endometrial epithelium and the human blastocyst suggest a role for these receptors in the apposition and adhesion phases of human implantation (Dominguez et al. These and other cycle-dependent changes are presented in greater detail in other sections of this chapter. Evidence in primates in support of a "window" has been published (Vishwanathan et al. However, the precise values for several cytokines and chemokines vary considerably between different studies and are likely due to different recovery techniques (lavage, wick, cup, or tampon) and sample population. In the polarized epithelium of the upper tract, in vitro studies have shown that, in many cases, secretion occurs preferentially toward the apical/luminal compartment, resulting in a gradient that is important for attracting immune cells to the epithelial surface (Fahey et al. However, not all cytokine/chemokine secretion is preferential toward the apical/luminal compartment. This variable secretion profile may reflect the different immune and nonimmune functions of many cytokines and chemokines. Whether this accounts for the preferential transmission of R5 strains over X4 strains remains unknown. As previously mentioned, cytokine and chemokine secretion into the extracellular milieu can alter the phenotype of neighboring cell populations. Similarly, incubation of macrophages or monocytes with secretions from stromal cells leads to an altered gene expression profile (Eyster et al. Depending on the stage of the menstrual cycle, two types of cervico-vaginal mucus are present, estrogenic (E) and progestational (P) or gestagenic (G) (Vigil et al. Estrogenic mucus is present at the proliferative stage and is increased during ovulation. Estrogenic mucus is defined by the crystallization patterns and is subdivided into three types: S, L, and P. Type L has a fern-like morphology and prevents the ascent of abnormal spermatozoa. Type P has a structure similar to type S and shows fern-like crystallization (Vigil et al. Progestational or gestagenic mucus is thick, sticky, and present at low levels during the menstrual and early proliferative phase but is present at high concentrations following ovulation and during the secretory phase (Morales et al. Progestational mucus blocks the passage of spermatozoa (Elstein, 1978; Vigil et al. Mucus protects vaginal and uterine epithelial cells from direct contact with pathogens. Secretions: Cytokines, Chemokines, and Antimicrobials Cytokines and Chemokines Pro-inflammatory chemokines that attract and cytokines that activate immune cells contribute to normal physiological homeostasis in the female reproductive tract, and are needed to deal effectively with potential pathogenic microbes. Mucosal epithelial cells are capable of producing these factors that communicate with cells of the innate and adaptive immune systems. The constitutive secretion and compartmentalization of large quantities of bioactive chemokines and cytokines provide additional evidence for the role of epithelial cells as gatekeepers of innate immune protection in the female reproductive tract. Moreover, when antibacterial activity in uterine epithelial cell secretions was measured using Staphylococcus aureus, E2 increased the secretion of a soluble factor(s) with antibacterial activity. Overall, these findings indicate that the production of cytokines, chemokines, and antimicrobials by uterine epithelial cells is differentially regulated by E2. Furthermore, it suggests that, with E2 regulation, epithelial cells that line the uterine cavity have evolved immunologically to be sensitive to viral and bacterial infections as well as to the constraints of procreation. Levels of cytokines, chemokines, defensins, and other protective factors and intrinsic antimicrobial activity were determined. A possible confounding variable is the impact of the menstrual cycle on cytokine levels in cervicovaginal secretions. Subgroup analyses of antimicrobials and chemokines at different stages of the menstrual cycle revealed that the cytokines were lower on study days 7 and 14 in women relative to those measured during the follicular/proliferative phase of the cycle (n = 11). Notably, study days 7 and 14 correspond with menstrual cycle days 13­18 and 20­25, respectively. Antimicrobials these are evolutionarily ancient molecules secreted primarily by immune and epithelial cells. Their inhibitory activity against a broad range of pathogens can be mediated via direct mechanisms such as membrane pore formation, or by indirect mechanisms such as altered receptor expression and receptor blockade (Ganz, 2003). Antimicrobials are not mutually exclusive from chemokines and cytokines, and there is considerable overlap between the groups. In several cases, the dual function of these molecules can lead to contradictory roles in innate defense. Antimicrobials do not function in isolation, and the presence of other family members can dramatically alter their effect. Studies in the respiratory epithelium have demonstrated additive and synergistic effects against pathogen survival when multiple antimicrobials were combined together in vitro (Singh et al. Thus epithelial cell secretion from the upper tract is a source of antimicrobials in the lower tract. Stratified squamous epithelial cells lining both the vagina and the ectocervix are usually layers of loosely connected cells. Tight junctions are intercellular connections between adjacent cells that restrict mixing of apical and basolateral compartments as well as control paracellular permeability across epithelial monolayers (Godfrey, 1997; Simons and Wandinger-Ness, 1990). Tight junctions consist of transmembrane and peripheral membrane proteins interacting to form a complex adhesion network, as reviewed elsewhere (Matter et al. For example, the transmembrane claudins interact with the cellular occludin for structural integrity of the tight junction. In cell inserts or transwell-type cell culture systems, epithelial cells generate an electrochemical gradient across a monolayer that reflects barrier function of the tight junctions (Planchon et al. Disruption of the tight junctions or damage to the epithelial layer can lead to infection, resulting in infertility and potential life-threatening illness. The tight junction barrier permits epithelial cells to respond to different stimuli and serve as a directional conduit for different factors. For example, the epithelial cell polymeric immunoglobulin receptor (pIgR) traverses the epithelial cell from the basolateral side to the apical side to release IgA into the lumen, as has been reviewed (Kaushic and Wira, 2008). The epithelial selective semi-permeable barrier at mucosal surfaces is regulated by many factors including calcium, cytokines, growth factors, microorganisms, and steroid hormones. Fluctuating concentrations of sex steroid hormones are a primary influence for the architectural and functional changes that occur during the menstrual cycle in preparation for the implantation of a conceptus. Estradiol is the dominant hormone during the proliferative phase, whereas during the secretory phase and pregnancy both E2 and P are elevated (Gruber et al. In the nucleus, both - and -receptors for estrogen are present in uterine epithelial cells. Treatments with pathogenic microbes typically have deleterious effects on barrier integrity. Similar effects were observed with polarized epithelial cell monolayers treated with rotavirus (Ciarlet et al. This would have important implications for pathogen recognition and innate immune protection during the various phases of the menstrual cycle. Immunoglobulins Immunoglobulin (Ig) concentrations in the genital tract are dependent on hormonal and local factors such as the presence of inflammation. The albumin:IgG ratio in cervical mucus, which remains relatively constant throughout the menstrual cycle, approximates that of serum. However, several studies concerning the origin of antigen-specific IgG in female genital tract secretions and immunohistochemical examination of the uterine cervix (see above) suggest that the locally produced, as well as plasma-derived, IgG contribute to the IgG pool in genital tract secretions. The finding that specific activity of IgG antibodies in the female genital tract secretions often reflects that of plasma suggests that IgG originates from the circulation. Irrespective of the local or plasma origin, IgG apparently is efficiently and selectively transported by epithelial cells into female genital tract secretions (Li et al. In contrast to pIgR, whose extracellular part remains associated with pIgA or IgM and is therefore termed a sacrificial receptor, FcRn is a recyclable receptor (Chapters 20 and 21). This selective and receptor-mediated transport of IgG is of considerable importance in the antibody-dependent protection of the female genital tract against microbial infections (Li et al. The IgA of cervical mucus is primarily S-IgA, with a small component of monomeric IgA (mIgA) (Vaerman and Férin, 1974; Roche and Crum, 1991; Kutteh and Mestecky, 1994; Kutteh et al. With respect to the distribution of IgA subclasses, the female genital tract secretions resemble the lower intestinal tract: IgA1 and IgA2 are present in approximately equal proportions (Kutteh et al. Because of the intrinsic resistance of IgA2 to IgA1 proteases of many pathogenic bacteria, the increased proportions of IgA2 may provide functional advantage to certain specific antibodies. There are some conflicting data with regard to Ig levels in the genital tract secretions and their dependence on various hormonal and environmental factors. Schumacher (1973) demonstrated that IgA and IgG in cervical mucus varies markedly with the stage of the menstrual cycle, with the lowest concentrations measured at midcycle, the time when estradiol rises sharply and ovulation occurs. Further suppression of IgA and IgG throughout the menstrual cycle was observed when women were treated with oral contraceptives. Total Ig levels in the cervical mucus reportedly increase shortly before ovulation and then decrease during ovulation, probably because of the increased production of cervical mucus and therefore dilution of Ig (Kutteh and Mestecky, 1994; Kutteh et al. In these studies, the proportion of IgG to IgA in human cervicovaginal Mucosal Immunity in the Human Female Reproductive Tract Chapter 108 2113 secretions remains relatively constant; however, at midcycle there is a decrease in the IgG:IgA ratio, apparently because of an estrogen-dependent increase in IgA. In human vaginal and cervical fluid, IgG levels varied with the stage of the menstrual cycle (Schumacher, 1973; Kutteh and Mestecky, 1994; Kutteh et al. In vaginal secretions from postmenopausal women, the IgG levels were reduced by one-half after hysterectomy, but IgA levels were reduced 15-fold (Jilanti and Isliker, 1977); this finding demonstrates the importance of the cervical and possibly the Fallopian tube/uterine contribution to the cervicovaginal Ig pool. In uterine secretions, IgG and IgA levels are also under hormonal control, and IgG appears to be the predominant Ig (Schumacher, 1980). Inflammatory conditions also influence levels of Ig in genital tract secretions (Chipperfield and Evans, 1972). Thus, the composition of genital secretions (including IgG and IgA levels) is dependent on hormonal and inflammatory factors (Wira and Stern, 1992). As shown in Table 1, it is clear that, under normal conditions, the vagina, the Fallopian tubes, and especially the uterine cervix are involved in local production of Ig based on the number of Ig-containing cells (Kutteh et al.

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Staphylococcal toxins augment specific IgE responses by atopic patients exposed to allergen pulse pressure 58 2 mg hytrin buy with visa. Upregulation of IgE synthesis by staphylococcal toxic shock syndrome toxin-1 in peripheral blood mononuclear cells from patients with atopic dermatitis blood pressure medication can you stop purchase hytrin 2 mg on line. The anti-inflammatory effects of omalizumab confirm the central role of ige in allergic inflammation blood pressure 160 over 100 order 5 mg hytrin with visa. Staphylococcus aureus enterotoxin B facilitates allergic sensitization in experimental asthma arrhythmia guidelines 2011 discount hytrin 2 mg with mastercard. Nasal polyps and middle turbinates epithelial cells sensitivity to amphotericin B blood pressure classification purchase hytrin master card. Lysozyme levels in the nasal secretions of patients with perennial allergic rhinitis and recurrent sinusitis. Beyond inflammation: airway epithelial cells are at the interface of innate and adaptive immunity. Migration of regulatory T cells toward airway epithelial cells is impaired in chronic rhinosinusitis with nasal polyposis. Serum amyloid A, properdin, complement 3, and toll-like receptors are expressed locally in human sinonasal tissue. Differential expression pattern of antimicrobial peptides in nasal mucosa and secretion. Inducible cyclooxygenase and interleukin 6 gene expressions in nasal polyp fibroblasts: possible implication in the pathogenesis of nasal polyposis. The grateful dead: damage-associated molecular pattern molecules and reduction/oxidation regulate immunity. The role of fibronectin binding proteins in the pathogenesis of Staphylococcus aureus infections. Identification of asthma phenotypes using cluster analysis in the Severe Asthma Research Program. House dust mite sublingual immunotherapy: the role for transforming growth factorbeta and functional regulatory t cells. Human pulmonary surfactant protein D binds the extracellular domains of toll-like receptors 2 and 4 through the carbohydrate recognition domain by a mechanism different from its binding to phosphatidylinositol and lipopolysaccharide. Surfactant protein d expression in chronic rhinosinusitis patients and immune responses in vitro to Aspergillus and alternaria in a nasal explant model. Antiviral and anti-proliferative glycoproteins from the rhizome of Smilax glabra Roxb (Liliaceae). Staphylococcus aureus enterotoxin B, protein A, and lipoteichoic acid stimulations in nasal polyps. Expression of eicosanoid receptors subtypes and eosinophilic inflammation: implication on chronic rhinosinusitis. Prostaglandin, leukotriene, and lipoxin balance in chronic rhinosinusitis with and without nasal polyposis. T-cell polarization depends on concentration of the danger signal used to activate dendritic cells. Soluble receptor for advanced glycation end products triggers a proinflammatory cytokine cascade via beta2 integrin Mac-1. Th2 cytokines associated with chronic rhinosinusitis with polyps downregulate the antimicrobial immune function of human sinonasal epithelial cells. Chronic rhinosinusitis with nasal polyps is associated with decreased expression of mucosal interleukin 22 receptor. Dendritic cells in nasal mucosa of subjects with different allergic sensitizations. Immunomodulation of nasal epithelial cells by Staphylococcus aureus-derived serine proteases. Aspirin-tolerant asthmatics generate more lipoxins than aspirin-intolerant asthmatics. Direct demonstration of delayed eosinophil apoptosis as a mechanism causing tissue eosinophilia. Innate and adaptive mediators in cystic fibrosis and allergic fungal rhinosinusitis. Allergic rhinitis: definition, epidemiology, pathophysiology, detection, and diagnosis. Evidence for diminished levels of epithelial psoriasin and calprotectin in chronic rhinosinusitis. Allergen-specific immunotherapy: from therapeutic vaccines to prophylactic approaches. Dissemination and implementation of the aria guidelines for allergic rhinitis in general practice. Differentiation of chronic sinus diseases by measurement of inflammatory mediators. Staphylococcus aureus colonization and IgE antibody formation to enterotoxins is increased in nasal polyposis. Mrp8 and Mrp14 are endogenous activators of toll-like receptor 4, promoting lethal, endotoxin-induced shock. Infection rate and virus-induced cytokine secretion in experimental rhinovirus infection in mucosal organ culture: comparison between specimens from patients with chronic rhinosinusitis with nasal polyps and those from normal subjects. Expression and significance of surfactant A in nasal polyps of chronic rhinosinusitis. Sinonasal surfactant protein A1, A2, and D gene expression in cystic fibrosis: a preliminary report. Proteolytic release of the receptor for advanced glycation end products from in vitro and in situ alveolar epithelial cells. Receptor for advanced glycation end products is subjected to protein ectodomain shedding by metalloproteinases. Different types of T-effector cells orchestrate mucosal inflammation in chronic sinus disease. Overexpression of miR-125b, a novel regulator of innate immunity, in eosinophilic chronic rhinosinusitis with nasal polyps. Microarray gene analysis of toll-like receptor signaling elements in chronic rhinosinusitis with nasal polyps. The dynamics of T cells during persistent Staphylococcus aureus infection: from antigen-reactivity to in vivo anergy. Immunology of the tubotympanum has been studied primarily during infection states. Development of mucosal immune responses to antigens continues through infancy Mucosal Immunology. This chapter describes the morphology of immunological tissue within the tubotympanum, the characteristics of local immune responses to common otopathogens, and regulation of the mucosal immune responses in the middle ear. The middle ear is a unique cavity and is normally considered a "sterile" environment (Kurono and Mogi, 1996) despite its proximity to the nasopharynx, a region of extensive antigen exposure in healthy individuals (Lim et al. The middle ear is lined with a simple mucosal membrane with typically few immunocytes present (Lim, 1979; Ichimiya et al. Mucosal Tissue Organization of the Middle Ear Structurally, the human middle ear cavity may be considered anatomically partitioned at the level of the tympanic membrane into an attic or epitympanic region above the membrane, then descending through the mesotympanic region adjacent to the tympanic membrane to the hypotympanic or anterior inferior region of the middle ear cavity (Ars et al. The middle ear cavity is lined with a thin mucosal membrane that covers all structures, such as the ossicles, and is continuous with the mucosal membrane in the mastoid antrum, eustachian tube, and nasopharynx (Lim, 1976, 1979). The mucosal epithelium within the epitympanic region is composed primarily of squamous epithelia with islands of ciliated columnar cells. These islands form a functional mucociliary pathway from the mastoid antrum in the epitympanum, through the mesotympanum, toward the eustachian tube. Similarly, the squamous epithelium of the mesotympanum has two paths of ciliated columnar cells, one continuing the path from the epitympanum and mastoid antrum and the other connecting the tympanic membrane through the hypotympanum to the eustachian tube. In the healthy middle ear, the mucosal surface of the mesotympanum is composed equally of squamous and ciliated columnar cells. The number of ciliated columnar epithelial cells in the mucosal lining progressively increases toward the eustachian tube to constitute about 80% of the cells adjacent to the eustachian tube entrance. These histomorphological changes evidence the progressive transformation from flat, nonsecretory squamous epithelium to respiratory epithelium that is pseudostratified, ciliated columnar cells just proximal to the eustachian tube entrance (Bluestone and Doyle, 1988; Lim, 1976, 1979; Ars et al. Within the eustachian tube, respiratory epithelial cells are tightly interconnected and utilize occludin and various members of the claudin family at tight junctions and E-cadherin at adherin junctions to optimize physical resilience of the membrane (Tsukita et al. These epithelial cells are ciliated and, in addition to goblet cells, also secrete mucus (Lim, 1979). Within the middle ear and eustachian tube, secretory glands secrete two types of mucus: mucoid and serous (Lim, 1979). Serous fluid is less viscous and is considered the origin of the periciliary fluid that aids mucociliary clearance of these regions. For example, in children, mucoid effusions from chronically infected middle ears contain higher concentrations of lysozyme, an antimicrobial enzyme (Liu et al. Efficiency of middle ear mucociliary clearance in infants and young children is impaired by the shorter, wider, more horizontal morphology of the eustachian tube, which increases the opportunity for antigen exposure or pathogen colonization while reducing the opportunity for mucosal immune responses, compared to the adult morphology (Bluestone and Doyle, 1988). To assist mucociliary clearance of the middle ear, the epithelium of the epitympanum, although primarily squamous, is well vascularized and performs a gas exchange role with the mastoid and middle ear cavities. Intermittent opening of the eustachian tube, during swallowing and yawning, in conjunction with the mastoid antrum gas pressurization, improves clearance of secretions from the middle ear into the nasopharynx (Ars et al. Overall, healthy eustachian tube functions include protection from microbial colonization by remaining predominantly closed, ventilating to regulate air pressure, and using gas-assisted mucociliary activity to improve clearance of secretions from the middle ear and eustachian tube. Ultimately, the relative sterility of the middle ear is maintained by continuous mucociliary clearance of the middle ear cavity in combination with host innate and adaptive immune responses (Lim et al. Immunocompetent Cells in the Middle Ear Mucosa Healthy middle ear mucosa is characterized by a simple, thin membrane with typically few immunocompetent cells, as observed in both animal models (Jecker et al. Mast cells and macrophages are the most commonly observed immunocompetent cell types in non-inflamed tissue, with mast cells predominant in healthy middle ears. Mast cells are preferentially distributed in the well-vascularized mucosa or ciliated mucosal epithelial layer of the tubotympanum rather than within the subepithelial layer (Palva et al. Immunocompetent cell numbers progressively fall as the healthy middle ear is approached from the nasopharynx via the eustachian tube (Widemar et al. Furthermore, approximately 77% of these children have a virus detected in their nasal secretions (Mandel et al. Upper respiratory tract viruses also stimulate increased expression of eukaryotic receptors such as intercellular adhesion molecule 1, carcinoembryonic Middle Ear and Eustachian Tube Mucosal Immunology Chapter 101 1927 antigen-related cell adhesion molecule 1, and platelet-activating factor receptor on the mucosal or host cell surface (Griffiths et al. Bacteria use these surface receptors as adherence sites and to alter rates of mucus secretion. Viral infection also stimulates innate mucosal immune responses, including inflammation and mucosal membrane thickening and increased mucus secretion by goblet cells, leading to reduced middle ear pressurization (Giebink et al. Middle ear inflammation after viral exposure can increase the rate of mucus secretion (Chung et al. Mucosal epithelial cell synthesis of antimicrobial peptides within the mucus can be impaired by viral infection (Mcgillivary et al. Furthermore, reduction of the number and activity of epithelial cell cilia within the eustachian tube by influenza A virus has been demonstrated to reduce the opportunity for neutralizing or clearing otopathogens from the middle ear in the chinchilla model (Park et al. Clearly, viral infection results in interruption or dysregulation of normal inflammatory responses of the mucosa within the eustachian tube and middle ear and permits transit of commensal nasopharyngeal bacteria to the middle ear. Subsequent inability to open the eustachian tube provides minimal opportunity for mucociliary clearance to the nasopharynx and enhances mucosal tissue damage through generation of pressure differential and local superinfection within the middle ear. Mucosal immune responses within the middle ear and eustachian tube may be overwhelmed by the extent of early bacterial colonization and result in unresolved inflammation within the middle ear. Effective mucosal immune responses within the middle ear may reduce the impact of bacterial load and/or virulence of the otopathogen. The additive effects of deletion of these genes on bacterial colonization and virulence provides further challenge for vaccine development. For healthy children, middle ear effusion normally resolves within 7 days in 40% of cases, and in 75­90% of cases resolution occurs within 4 weeks (Mandel et al. Persistent bacterial infection of the adenoids has been the focus of recent microbial studies that demonstrated that S. Furthermore, intracellular localization of bacteria within the middle ear mucosal cells has now been confirmed and the bacterial species subsequently identified (Coates et al. Multispecies bacterial biofilms containing these species have been visualized on the middle ear mucosa and characterized using confocal microscopy. The presence of multiple bacterial species, within the same middle ear mucosal samples, could provide additional protection to each microbe, protecting them from host innate and acquired immune defenses (Armbruster et al. Biofilm formation is known to significantly increase bacterial protection from antibiotic treatment (Slinger et al. Biofilm formation has also been observed in both the nasopharynx and middle ear in the chinchilla model after initial intranasal inoculation with influenza A followed by S. Biofilm formation occurs rapidly and the presence of bacteria, not successfully cleared by local or systemic immune responses or antibiotic therapy, poses a challenge for vaccine efficacy. The resultant reduced pressurization of the middle ear causes extravasation of fluid into the middle ear chamber. Together, trapped antigens and otopathogens activate recruitment of immunocompetent cells and then stimulate local antibody secretion, providing evidence that the middle ear is an active effector site. These changes include increased numbers of mucous glands, goblet cells, and lymphoid follicles containing germinal centers. The thickened mucosa also exhibits increased mucus secretion arising from the mucosal hyperplasia within the eustachian tube (Matsune et al. Immunoregulatory mucosal immune responses may include alteration of the secretion and timing of various cytokines, interferons, and chemokines from cells located within and recruited to the mucosal epithelium. Cross-talk between these molecules may optimize activation of innate immune responses such as inflammation, but also facilitates attenuation of signaling to minimize the risk of local tissue damage. This synergistic activation of inflammation inducers occurs through multiple intracellular signaling pathways (Kweon et al.

Specialized epithelial cells blood pressure medication and coenzyme q10 buy 1 mg hytrin, so-called microfold or membrane (M) cells ulterior motive quotes buy hytrin 1 mg amex, have been identified in both organs within the epithelium facing lymphoid follicles and probably contributing to antigen uptake heart attack referred pain buy generic hytrin from india. Thus blood pressure chart to record generic hytrin 2 mg with visa, the presence percentil 95 arteria uterina purchase hytrin without prescription, and sometimes the predominance, of nonepithelial cells is characteristic of the reticular epithelium. Therefore, the reticular epithelium apparently provides a favorable environment for intimate contact between various cells of the immune system. These cells may directly present antigen to T cells by rapid upregulation of the costimulatory molecules B7. Hence, interactions between B cells and T cells in the reticular epithelium likely contribute to the first line of defense in the oropharynx against various microbial and other antigens. This unique anatomical localization of memory B cells may contribute to swift secondary antibody responses. In some articles, the term "marginal-zone B cells" has been introduced for the B cells located within and beneath the crypt epithelium (Spencer et al. This is so because they express certain characteristics similar to B cells in the marginal zone of the spleen, but strictly speaking they are not truly marginal-zone B cells. In addition, the reticular epithelium is a site for abundant Ig leakage into the crypt and, as discussed later, in the adenoid crypts there are epithelial patches with active IgA export (Brandtzaeg, 1987, 1998). Altogether, the crypt epithelium represents a specialized compartment of potential importance for several immunological functions. Naïve B and T Cells Enter Tonsils via High Endothelial Venules Migration of lymphoid cells is strictly regulated by the expression of multiple adhesion molecules and receptors for chemoattractants (chemokine receptors) that interact with corresponding ligands on endothelial and stromal cells (Kunkel and Butcher, 2002). Primary follicles of secondary lymphoid organs, such as the tonsils, consist mainly of recirculating naïve B cells positive for surface IgD and IgM (sIgD+sIgM+)-both coexpressed isotypes exhibiting the same specificity for antigen. It is still unclear why both sIgD and sIgM must be expressed to render B cells antigen reactive. The existence of these cells and their accumulation in the primary follicles depend on the presence of B cells. Altogether, the tonsils possess the biological armamentarium that should enable them to mount both primary and secondary T-cell responses (Brandtzaeg and Halstensen, 1992). The activated B cells can pick up antigen and, after processing, further present it as peptides to the cognate T cells in an interaction that provides mutual support. A variety of adhesion molecules and other receptor proteins are involved in these interactions (Brandtzaeg and Halstensen, 1992). By multiparametric flow cytometry five distinct maturation-associated B-cell subpopulations have recently been identified and isolated from tonsils by means of relevant markers: naive B cells, centroblasts, centrocytes, plasmablasts, and memory B cells (Kjeldsen et al. This approach will allow further studies of the complex tonsillar B-cell differentiation. Note that positivity for Ki-67+ is restricted to nuclei of non-T cells (presumably activated B cells, centroblasts and centrocytes). In the apical light zone, these special Th cells may interact with centrocytes to induce both proliferation and isotype switching (Moser et al. Cell-surface markers and transcription factors are currently under investigation (Linterman and Vinuesa, 2010; Yu and Vinuesa, 2010; Rasheed et al. Bcl-6 suppresses transcriptional regulators of alternative effector fates (Ma et al. This gene encodes a 15-kDa peptide, the joining (J) chain, which is a crucial structural part of dimers and trimers of IgA (collectively called polymeric IgA, pIgA) as well as pentameric IgM (Brandtzaeg, Immunobiology of the Tonsils and Adenoids Chapter 103 1993 2009). This process is often accompanied by some "nonclassical" switching to IgD (Brandtzaeg, 2010). Most strains of Haemophilus influenzae and Moraxella catarrhalis, which are common colonizers of the nasopharynx, express outer-membrane Igbinding factors that can activate sIgD+ B cells by crosslinking sIgD of the B-cell receptor (Janson et al. In this manner it seems likely that sIgD+ tonsillar centrocytes are stimulated to proliferate and differentiate polyclonally, thereby driving V-gene hypermutation and S/C gene deletion (Liu et al. Such regional microbial influence on B-cell differentiation is supported by our observation that S/C deletion is more frequently detected in diseased than in clinically healthy tonsils and adenoids (Johansen et al. It is interesting that sIgD+IgM- B cells appear to express predominantly V-gene repertoires that may allow considerable cross-reactivity, including autoimmunity, but understanding the biological significance of this observation requires further studies (Zheng et al. A minor fraction of tonsillar centroblasts undergoes nonclassical switching by deleting a variable part of S and the complete C region. The tissue samples providing these data were from children with clinically healthy or diseased (recurrent tonsillitis) palatine tonsils. Thus, the J-chain-inducing capacity of these organs is much higher than that of peripheral lymph nodes but similar to that of mesenteric lymph nodes. It is unknown how the tonsillar cytokine profiles and other microenvironmental factors impact on isotype differentiation and coexpression of J chain in local B cells (Todorovi and Zvrko, 2013). The diseased tonsils were removed because of at least three annual attacks of acute tonsillitis during the past 2 years (Korsrud and Brandtzaeg, 1981a). Our studies were performed in 1980 and we were fortunate to obtain an age- and sex-matched unique biopsy control material of normal tonsils and adenoids from a group of children undergoing surgery for inguinal hernias. None of them had had any episode of acute tonsillitis, increased frequency of common colds, or acute otitis media, and their serum Ig levels were normal. Informed consent to perform biopsy was obtained from their parents (Korsrud and Brandtzaeg, 1981b). A similar but nonsignificant trend was observed in hypertrophic adenoids removed because of obstructive symptoms in a group of age-matched children (Korsrud and Brandtzaeg, 1981b). It was also shown that the level of vitamin A in the diet is decisive for induction of the gutspecific homing molecules (Koenecke et al. By fluorescence-activated cell sorter analysis, the percentages of various T-cell subsets and different types of B cells in palatine tonsils and adenoids have been evaluated (Bernstein, 1990); because of the lymphoid follicles, there is a high percentage of B cells in these lymphoid organs (52%) compared with peripheral blood (14%), while T cells are consequently relatively less represented Table 1). In a recent much more extensive flow cytometric study of T cells isolated from pediatric tonsils, five subsets with striking similarities to various thymic developmental intermediates were identified (McClory et al. These findings made the authors speculate that the pediatric tonsils could serve as an extrathymic reservoir of T-cell precursors, which might augment the T-cell pool in settings of poor thymic function. It was concluded that the adenoidal Treg cells could contribute to the persistence of pneumococci in children. It is unknown whether the above heterogeneity of identified tonsillar Treg cells reflects the plasticity of T cells or should be ascribed to methodological differences among the studies. Thus, depletion of these Treg cells enabled tonsillar Th cells to respond to common antigens and allergens. Altogether, the study gave strong support to the notion that Treg cells exert a homeostatic function in the tonsils on encounter with aeroallergens and food proteins. Studies have reported that such cells constitute no more than 2% of all tonsillar cells (Nadal et al. Over decades several pieces of evidence have accumulated to suggest that the nasopharyngeal microbiota represents a major stimulus for tonsillar B cells, providing a persistent clonally specific and also a polyclonal stimulus (Brandtzaeg, 1987). Both bacterial and viral pathogens can make their imprint in the local antibody repertoire. Furthermore, serum IgD is increased in some patients with bacterial pneumonia and in cigarette smokers. Further, IgD of local origin appearing in nasopharyngeal secretions of such patients is well correlated with the IgD level in their middle ear effusions. This accords with the classic study of Ogra (1971) more than four decades ago; combined tonsillectomy and adenoidectomy had a profound detrimental effect on the local IgA response against poliovirus in nasopharyngeal fluid. His observation paralleled the increased incidence of paralytic poliomyelitis after the operation, implying that these organs play a role in the defense against bacterial and viral infections. A plexus of thinwalled, small blood vessels is present beneath the crypt epithelium, and many capillaries actually lie within its reticular parts (Curran and Jones, 1977). Thus, an abundance of extravascular Ig dominated by IgG is seen in this area (Brandtzaeg, 1987). The surface (to the right) and crypt (to the left) epithelium is indicated by dashed line. The antimicrobial peptide calprotectin (L1 protein) is produced by squamous oral epithelial cells and also by the crypt epithelium. Both the surface epithelium and the reticular crypt epithelium are strongly positive, and there are also scattered positive cells (presumably granulocytes and macrophages) in the extrafollicular areas (faintly counterstained with hematoxylin). Adenoids from 110 patients undergoing adenoidectomy for either hypertrophy or recurrent otitis media were used. It is therefore possible that colonization with inhibitory strains of viridans streptococci may be used as a relatively safe and inexpensive approach to prevention of recurrent otitis media in some children. Bacterial interference is an old concept that has been studied for over a century. Pasteur noted the effect of indigenous gastrointestinal bacteria on the anthrax bacillus in cows (Johanson et al. Subsequently, there has been very active research on the effect in vitro and in vivo of bacterial interference in the nasopharynx of children with otitis media following antibiotic therapy (Brook and Gober, 1998). Bacterial interaction among nasal colonizers, with the eradication of Staphylococcus aureus from the nasal cavities by artificial implantation of Corynebacterium spp. However, we are only beginning to understand how the microbiota living on various body surfaces are protecting or promoting against chronic disease. The characterization of the microbiom of the airways is in its infancy, and it seems that the most prevalent commensal species differ according to the anatomical level (Renz et al. Likewise, palatine tonsils of patients with pneumococcal colonization were found to contain Treg cells-a fraction of which was directly shown to be antigen specific (Pido-Lopez et al. In Neisseria meningitidis infection the effector Th response likewise seems to be subjected to Treg cell suppression (Davenport et al. Although the function of Treg cells in infection is generally considered to be beneficial because tissue integrity is maintained, the above examples show that the homeostatic goal may sometimes be counterproductive. A previous section dealt with the important role of Treg cells in homeostatic control of the immune response against principally innocuous environmental antigens such as aeroallergens and food proteins (Palomares et al. Furthermore, some renal disorders such as IgA nephropathy and glomerulonephritis (see Chapter 105) have been associated with inflammatory diseases of the upper respiratory tract (Miura et al. In the light of modern immunology, secondary disorders caused by focal infection of the tonsils may be considered in the category of autoimmune diseases. The disease is characterized by numerous pustules and erythematous patches on the palmar or plantar skin. The disease tends to have unpredictable exacerbations that often occur in periods of acute aggravation of infected foci in the tonsils. A similar pathogenic T cellmediated link between the tonsils and skin has been suggested for psoriasis (Sigurdardottir et al. IgA nephropathy is thought to be mediated by the glomerular deposition of circulating immune complexes containing IgA as the major antibody component. Upper respiratory tract infections-and particularly tonsillitis- often precede IgA nephropathy, and in some cases, tonsillectomy is effective for the treatment of this disease (Sanai and Kudoh, 1996). Thus, the tonsils appear to be a unique site causing initial and/or progressive events to generate nephritogenic immune complexes in IgA nephropathy. Thus, there appears to be a dysregulation of IgA production in the upper respiratory tract of such patients. However, IgA2, IgG, IgM, and C3 did not show any differences in distribution between the two groups. These results suggest that additional factors are needed for the progression of IgA nephropathy. Some investigators have found a high incidence of solid cancers, particularly, breast and colon neoplasms, in patients who have had appendectomy, but others have disagreed. The association of tonsillectomy and/or appendectomy with the development of malignant lymphomas has also been suggested but has been difficult to document convincingly (Lee, 1975). When cases were compared with age-matched control siblings, a significant association (P < 0. This controversy seems to have been resolved in a large retrospective study which included all Danish patients during 1977­2001 (Vestergaard et al. Furthermore, as noted previously, activated human tonsillar B cells were found to migrate to the lung, but not to the gut mucosa, when transferred to mice with severe combined immunodeficiency (Nadal et al. Notably, direct immunization of the palatine tonsils, and for the adenoids particularly vaccination by the nasal route, gave rise to local B-cell responses while the induced specific B cells circulated without being able to enter the small intestinal mucosa (Quiding-Järbrink et al. It has also been documented in several human studies that nasal immunization induces specific IgA antibodies in nasopharyngeal secretions, in addition to enhancing systemic immunity (Brandtzaeg, 1984, 2007). The extravasation of activated memory/effector B and T cells into effector tissues takes place through the local microvascular endothelium and is controlled in a sitespecific manner. This process is much better defined for the intestinal lamina propria than for other secretory tissues (Kunkel and Butcher, 2002; Brandtzaeg and Johansen, 2005). Thus, the B-cell homing dichotomy between the gut and the upper aerodigestive tract clearly has a molecular basis in terms of adhesion molecules and chemokines. Also the endometrium shows some secretory immunity activity, depending on the phase of the menstrual cycle, and the endometrial glands can apparently take up plasmaderived pIgA (and pIgM) in a pIgR-dependent manner (Brandtzaeg, 1997). Moreover, studies in mice have directly shown that antigen-specific IgA+ plasmablasts induced by nasal immunization migrate to the uterus (Cha et al. There is interest in the possibility that nasal immunization might be exploited in the combat against sexually transmitted infections, and this vaccination route has induced high levels of IgG and IgA antibodies in vaginal secretions of both nonhuman primates (Russell et al. However, it is difficult to determine with certainty the proportion of plasma-derived antibodies in vaginal secretions, especially after nasal immunization which elicits high levels of circulating IgG and IgA antibodies (Cuburu et al. The latter molecular pair is apparently also important for homing of tonsillar B-cell blasts to the upper respiratory tract (Brandtzaeg, 2010; Kunkel et al. In recent mouse experiments, it has been shown that the low expression of 47 after intranasal immunization is the direct reason for exclusion of the disseminated B cells on a competitive basis from the small intestinal mucosa (Agnello et al. This concept has been maintained by our laboratory over several decades (Brandtzaeg, 1987, 1996; Brandtzaeg and Halstensen, 1992). The principal homing receptor profiles of the respective B-cell populations, and compartmentalized adhesion/chemokine cues directing their extravasation at different effector sites, are indicated in the boxes. The gland-associated distribution of plasma cells, after terminal differentiation of the extravasated mucosal B cells, is schematically depicted at the bottom. These results have been strongly corroborated by tonsillar immunization in rabbits, leading to specific IgA antibody responses in salivary glands to a much higher level than by enteric immunization (Inoue et al.

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