Robert A. Harrington, MD

• Professor of Medicine
• Director, Cardiovascular Clinical Trials
• Co-Director, Cardiovascular Research
• Duke Clinical Research Institute
• Department of Medicine, Division of Cardiology
• Duke University Medical Center
• Durham, North Carolina

Mesenchymal stem cell and islet co-transplantation promotes graft revascularization and function treatment jellyfish sting purchase online valif. Mesenchymal stem cells are recruited into wounded skin and contribute to wound repair by transdifferentiation into multiple skin cell type treatment yeast diaper rash cheap valif 20 mg with visa. Cardiac repair with intramyocardial injection of allogeneic mesenchymal stem cells after myocardial infarction symptoms dehydration buy 20 mg valif visa. Nitric oxide plays a critical role in suppression of T-cell proliferation by mesenchymal stem cells treatment 3rd degree burns cheap 20 mg valif. Human multipotent mesenchymal stromal cells use galectin-1 to inhibit immune effector cells medications used to treat ptsd buy valif online pills. Interleukin 1 receptor antagonist mediates the antiinflammatory and antifibrotic effect of mesenchymal stem cells during lung injury. Bioengineering and regeneration of the endocrine pancreas References 495 and angiogenesis of isolated islets after transplantation. Protection of rat pancreatic islet function and viability by coculture with rat bone marrow-derived mesenchymal stem cells. Increased expression of heme oxygenase-1 in human retinal pigment epithelial cells by transforming growth factor-beta. The X-linked inhibitor of apoptosis protein enhances survival of murine islet allografts. A method for performing islet transplantation using tissue-engineered sheets of islets and mesenchymal stem cells. Human fibroblast sheet promotes human pancreatic islet survival and function in vitro. An engineered cell sheet composed of human islets and human fibroblast, bone marrow-derived mesenchymal stem cells, or adipose-derived mesenchymal stem cells: an in vitro comparison study. Multipotent stromal cells are activated to reduce apoptosis in part by upregulation and secretion of stanniocalcin-1. The effect of fibroblast activation on vascularization in transplanted pancreatic islets. Cooperation by fibroblasts and bone marrow-mesenchymal stem cells to improve pancreatic rat-to-mouse islet xenotransplantation. Molecular links between tumor angiogenesis and inflammation: inflammatory stimuli of macrophages and cancer cells as targets for therapeutic strategy. Trophic molecules derived from human mesenchymal stem cells enhance survival, function, 90. The underlying purpose of regulatory guidance and prescriptions is to ensure the safety of the products offered by health practitioners and industry alike to the public. Two major gatekeeping steps are in place, the first allowing to test the products in humans and the second to market them. The application of these general guidance documents to pancreatic cells use depends on a combination of the risk/benefit evaluation for the specific preparation and on the local legal environment. This means that the operational stages which need to be analyzed for the risk/benefit ratio, before marketing authorization, are three: (a) procurement, (b) manipulation and storage, and (c) administration and follow-up. As guidance for this evaluation, practitioners can turn to different sources which increasing prescriptive value depending on the legal status of the procedure which they need to perform. Noncommercial, laboratory research activities require only the authorization usually applied to the use of animal models and the informed consent of the donors for the human material involved. On the other hand, clinical studies in humans require an understanding of the cumulative risk posed by the product procurement, manipulation, and administration procedures which is not always straightforward. Regulation for regenerative medicine-based therapies A brief historical perspective of the use of cells Historically, the path taken by the blood transfusion procedure in the 1800s and by bone marrow transplants during the 1940s was of trial and error in patients with little hope of survival due to terminal illnesses. Similar considerations led the transplant of organs to be considered a medical practice not subject to commercial regulation as an industrial product. The thalidomide-related public health debacle of the 1950s,4 primed the governments for the creation of a complex system of preclinical and clinical testing for medicinal products commercially produced and distributed. The current process requires the production of preclinical data sufficient to have an evaluation of the mode of action, identity, potency, and predicting the safe initial dose before authorizing experimentation on human subjects. A final evaluation based on the risk/benefit ratio assessed during the clinical trials leads to the authorization to marketing the medicinal product and the definition of the conditions to do so. This evaluation is separated from the cost/benefit assessment and price negotiation for the final product payment. This system has been in place for more than 60 years, presiding over a sustained increase in the average life-span in the first world society, and an increased infant survival in the third world. The appearance of products derived from living organism (antibodies and growth factors) in the 1980s,5 blurred the line between drugs and living cells. However, the final products were still identifiable by a chemical formula albeit with additional data needed to clarify the sequence and posttranscriptional modification like glycosylation and protein folding. These characteristics and the large-scale industrial manufacturing led to the creation of the biologicals class of medicinal products but did not require changes in the regulatory approach. This last class of medicinal products was defined as acting through the "regeneration, repair, or replacement" of the target tissue or function. This was the first time that the term regeneration was referred to for a medicinal product in a European legislative document. Differences between United States and European Union regulatory framework In the United States, as well in Japan, a central authority deals with all the stages of drug development, from the preclinical to clinical and marketing authorization. Similarly, a set of three Directives regulate Advent of cell and gene therapies the technological advances in the identification and separation of cells based on their phenotype,6, 7 the identification of numerous growth factors,8­10 the ability to obtain modification of the cell genome,11­13 and the development of defined culture media6, 14­16 allowed the B. Bioengineering and regeneration of the endocrine pancreas Therapeutic use of pancreatic cells 501 the procurement, storage and distribution of human cell and tissues for therapeutic purposes. Therapeutic use of pancreatic cells Pancreas transplant Diabetes type I is the most common pathology requiring the replacement of the pancreas, with nearly 50,000 procedures performed worldwide from the first attempt in 1966 at the University of Minnesota. The number of pancreas transplant performed yearly is decreasing steadily with alternate approaches taking its place. In a simplified way, the following general rules are applied: · For a cell population, like pancreatic cells, to be included in the cell therapy medicinal products, the cells need to be extensively manipulated or to be used to exert a function which is not normally expected in vivo. As an example, the administration at nonphysiological concentration, or in a novel location in the body, is a mechanism exploited to exert a function normally not expected. The expansion of the cell number, or inducing maturation, in vitro is considered an extensive manipulation. In the Annex I of the Regulation 1394/2007, a list of manipulation which are considered not extensive is provided. Pancreatic islet transplant-Encapsulated cells the use of pancreatic islet for transplantation was introduced by the Edmonton group in 1988. The use of the pancreatic islet does not reduce the need for immunosuppression and the related long-term morbidity. The current status of the pancreatic islets transplant is also amply discussed elsewhere in this book (Vol. The encapsulation of allogeneic or xenogeneic cell population in a shell of permeable material allows the exchange of nutrients and small proteins (including insulin) but do not expose the cells to the immune detection of the host bypassing the need for immunosuppression. A full disclosure, of the characteristic of both encapsulating device/matrix and of the pancreatic islets, is required for the clinical studies and the marketing authorization. An example of the possible parameters required could be: (a) the average number of pancreatic islets for single capsule, (b) the size of the pores and exclusion limit for the matrix, (c) its stability in time, and (d) the length of pancreatic cell survival and the response to glucose challenge in vivo. From the point of view of the manufacturing, the creation of droplets containing the pancreatic islets in a reliable and consistent manner would be one of the major challenges for the scalability of the process and for the expansion of the manufacturing in multiple sites. Overall, for this particular class of medicinal products, the risk factors to be assessed are mostly linked to the encapsulating matrix and to the possible release of the pancreatic cells due to breakage for mechanical stress. The cells released could theoretically transmit infective diseases or rise an immune response undermining the lesser concerns due to their isolation to start with. Conclusion Pancreatic cell use is increasing rapidly following the capacity to expand primary cells ex vivo and to obtain progenitors which could be expanded and maintained for a long time. The rapid progression of the field is hampered by the lack of knowledge on the long-term safety of the cell population used. However, novel analytical tool allowing a genomic and proteomic scanning of single cells are now coming of age and will allow the regulatory science to better define the identity and function of cells as the active principle of this novel class of drugs. Regenerative medicine: historical roots and potential strategies in modern medicine. The molecular mechanisms of thalidomide teratogenicity and implications for modern medicine. A consensus introduction to serum replacements and serum-free media for cellular therapies. Immortalization, proliferation, and differentiation in vitro are all process which are associated with an increased risk of senescence and oncogenic transformation. The steps required to obtain pure cell population are only partially understood and analytical tools capable to assess single cells genomic alteration are only now becoming feasible. Proliferation and differentiation, in an artificial environment under a proliferative pressure, are bound to result in some form of modification from donated pancreatic cells. It is unclear at the moment if such modifications are relevant for their ability to deliver the desired functions and if they pose any significant risk. Items that the regulatory agencies identified as safety concerns where the presence of antigens derived from the culture media on the cells surface, senescence of the final cells after a fast proliferation required to expand the population to the desired cell number, presence of nondifferentiated, possible cancerous, cells in the "final product," lack of consistency in the cell population obtained from different donors, lack of three-dimensional arrangement of the cells obtained in vitro. These were all factors identified in addition to the possibility to carry infective agents, as virus, bacteria or mycoplasma. Scientific recommendation on classification of advanced therapy medicinal products. Human pluripotent stem cell differentiation to functional pancreatic cells for diabetes therapies: innovations, challenges and future directions. Children and adults living with T1D must monitor their glucose levels multiple times each day and rely on nonphysiologic exogenous insulin therapy to try and maintain a glycemic range close to physiological levels to prevent the risks or consequences of extreme blood glucose excursions. Insulin therapy to manage T1D is achieved by using short- and long-acting insulin analogs administered via subcutaneous injections or infusion pumps. Moreover, the use of novel or repurposed therapies being developed for type 2 diabetes and other diseases as adjunctive to insulin treatment has further improved glycemic control and overall metabolic homeostasis in T1D. The ability to stage the progression of the disease, from the initial presence of beta-cell autoimmunity with no signs of dysglycemia, to the occurrence of diabetic complications due to a longstanding symptomatic disease, provides the opportunity to develop diagnostic tools and multiple strategies for therapeutic interventions. Catalyzing beta-cell replacement research to achieve insulin independence in type 1 diabetes: Goals and priorities goal remains the same but has expanded its research commitment to preventing the disease and delivering new therapies or devices to improve outcomes and reduce the risks and burdens of T1D. As a patient driven organization, the main focus is to improve outcomes by allocating funds to promising research at all stages of development, from exploratory and translational research to human studies to validate clinically meaningful therapies. Given the cost and challenges of developing therapeutic products, it is critical to establish and potentiate strategic collaborations with the pharmaceutical and biotechnology industries, as well as other funding organizations, which can provide expertise and resources throughout the development stages to make products available to people with T1D. Bioengineering and regeneration of the endocrine pancreas Beta-cell replacement 507 immunosuppression therapy required to prevent rejection and the recurrence of autoimmunity. There is extensive research in the field on what constitute the most functional source of insulin-producing cells whether is a complete islet-like structure or beta cells alone, but for the purpose of this review the terminology of beta cells will refere to all insulin-producing sources under validation. While most of the funding has been assigned to support research and clinical grants from academic institutions or research centers, significant investments have been made through other mechanisms that are key to the advancement of the program. Islet transplantation the history of islet and pancreas transplantation used to treat T1D has demonstrated the apparent utility of these procedures in improving the clinical outcomes in a subset of individuals with T1D. This equipoise has changed in the past three decades as improvements in islet production, engraftment strategies, and immunosuppressive therapy, have resulted in the introduction of donor islet transplantation as a minimally invasive approach to restore glucose control in people living with T1D. Over the years, clinical outcomes have improved and patients with life-threatening hypoglycemia unawareness are now considered a population that can benefit from these procedures. Catalyzing beta-cell replacement research to achieve insulin independence in type 1 diabetes: Goals and priorities that did not involve the limited resource of human cadaver pancreatic islets. Supporting basic research to understand the signals involved in pancreatic development was a key area of focus that led to the ability to generate functional beta cells or islet-like clusters containing additional cell types of pancreatic islet, from a variety of stem cell sources using in vitro protocols. These studies have resulted in the establishment of commercial entities like Viacyte that are already in clinical trials. Others are now scaling up and further optimizing the differentiation and maturation process of stem cells into functional islet-like clusters capable of restoring glucose control in models of T1D. Lastly, the third priority was to optimize the local microenvironment of the transplant site for the long-term graft function. However, in the long run there may be alternative strategies one should consider in the design of future generation products. For example, genome editing could be applied cells to mitigate immune recognition and promote tolerance so that less or no immunosuppression or encapsulation would be required. Another potential strategy involves induction of immune tolerance toward transplanted cells and may be an approach that would direct the host immune system to accept grafts without the use of chronic systemic immune suppression, obviating or reducing the requirement of a fully encapsulated system. Alternative cell sources: Recent advances in cell therapy have positioned stem cell-derived islet clusters and porcine islets as the most promising replenishable alternative sources of insulin-producing cells. Bioengineering and regeneration of the endocrine pancreas Beta-cell replacement 509 the development of a renewable insulin-producing cell source from human stem cells or porcine islets. The jury is still out on whether the optimal commercial cell therapy product would incorporate a pancreatic progenitor cell population or a fully mature beta-cell population. Current stem-cell derived preparations that are already in clinical testing generate insulin-producing cells contain polyhormonal cell populations that are not fully functional at the time of transplantation, and it remains to be determined whether additional non- endocrine cells from pancreatic islets are beneficial and required to constitute the most efficacious cell therapy product for T1D. Development of stem cell-derived therapies also requires long-term safety assessment, such as the risk of uncontrolled growth and formation of teratomas, and establishment of effective manufacturing processes. Xenotransplantation of porcine islets has shown some success in restoring glucose control in T1D model systems, and is gaining acceptance as an alternative readily available cell source. Further understanding of the xenogeneic immune response and infectivity potential, as well as the ability to eradicate targeted sequences using genome editing, make xenotransplantation a promising option. Strategies to protect implanted cells: Advances in biomaterial research, 3D medical printing, immunomodulation, and drug delivery strategies, as well as preclinical models to assess fibrosis and allogeneic responses have allowed development of both device and device-less approaches to protect beta cells after implantation. Encapsulation technologies use biomaterials to create an immunoprotective physical barrier around islet cells and are thereby designed to limit, and ideally eliminate, undesirable immunological responses to the foreign graft. A permselective biocompatible material allows for exchange of small molecules such as oxygen, glucose, insulin, and selected nutrients in and out of the device via diffusion, while blocking larger molecules, such as immune cells and antibodies.

Demethylation of induced pluripotent stem cells from type 1 diabetic patients enhances differentiation into functional pancreatic cells 10 medications valif 20mg mastercard. Marked differences in differentiation propensity among human embryonic stem cell lines symptoms lymphoma valif 20 mg buy without prescription. Differential methylation of tissue- and cancer-specific CpG island shores distinguishes human induced pluripotent stem cells medications xyzal cheap 20 mg valif with visa, embryonic stem cells and fibroblasts symptoms pink eye valif 20 mg purchase mastercard. Cell type of origin influences the molecular and functional properties of mouse induced pluripotent stem cells medications jfk was on order 20 mg valif visa. Hotspots of aberrant epigenomic reprogramming in human induced pluripotent stem cells. Humanized mice reveal differential immunogenicity of cells derived from autologous induced pluripotent stem cells. Development of autoimmune-mediated cell failure after total pancreatectomy with autologous islet transplantation. The role of human leukocyte antigen matching in the development of multiethnic "haplobank" of induced pluripotent stem cell lines. Encapsulated islets for diabetes therapy: history, current progress, and critical issues requiring solution. A newly developed immunoisolated bioartificial pancreas with cell sheet engineering. Areview of the foreign-body response to subcutaneouslyW implanted devices: the role of macrophages and cytokines in biofouling and fibrosis. Maturation and function of human embryonic stem cell-derived pancreatic progenitors in macroencapsulation devices following transplant into mice. Xeno-transplantation of macro-encapsulated human islet and pluripotent stem cellderived pancreatic progenitors in absence of immunosuppression. Human leukocyte antigen I knockdown human embryonic stem cells induce host ignorance and achieve prolonged xenogeneic survival. Targeted disruption of the 2-microglobulin gene minimizes the immunogenicity of human embryonic stem cells. Scalable generation of universal platelets from human induced pluripotent stem cells. Induced pluripotency and gene editing in disease modelling: perspectives and challenges. Generation of induced pluripotent stem cells without Myc from mouse and human fibroblasts. Sequential expression of pluripotency markers during direct reprogramming of mouse somatic cells. Generation of transgene-free induced pluripotent mouse stem cells by the piggyBac transposon. Derivation and characterization of sleeping beauty transposon-mediated porcine induced pluripotent stem cells. Non-viral reprogramming of fibroblasts into induced pluripotent stem cells by Sleeping Beauty and piggyBac transposons. A small-molecule inhibitor of tgf-Beta signaling replaces sox2 in reprogramming by inducing nanog. Cell-surface markers for the isolation of pancreatic cell types derived from human embryonic stem cells. Inhibition of pluripotent stem cell-derived teratoma formation by small molecules. Selective elimination of human pluripotent stem cells by an oleate synthesis inhibitor discovered in a high-throughput screen. Protecting against wayward human induced pluripotent stem cells with a suicide gene. The disease is characterized by irreversible morphological changes and gradual fibrosis of the entire gland. Exogenous insulin therapy provides some glycemic control, but these patients are categorized as "brittle diabetics" and experience reduced lifespan and accelerated effects of hyperglycemia. For patients with chronic pancreatitis (A) a total pancreatectomy followed by (B) an islet autotransplantation is a very promising therapy for managing brittle diabetes. This requires a trained team to isolate and prepare an islet product for transplantation. Ductal cells as a potential source for beta cell regeneration Unlike highly proliferative tissues such as the skin, intestines, or the hematopoietic system, the pancreatic endocrine compartment consists of cells that have a very low turnover rate. The differentiation of islets from such cells is termed as islet neogenesis9,10; whereas, transdifferentiation is defined as the conversion of one completely different cell type to another. Theoretically, the pancreatic epithelial cells are valuable sources for beta cell reprogramming since all of them arise from the same embryonic precursor. A model describes the branching morphogenetic pattern of the embryonic pancreas,16 where the embryonic pancreas is based on several multipotent progenitor cells resting on the tips of the branching pancreatic tree, determined using genetic lineage-tracing experiments. Under specific signaling instructions, these progenitor cells give rise to the ductal and endocrine cells, with the tip progenitors eventually differentiating into acinar cells at the end of the ducts. Ngn3+ cells in the progenitor pool differentiate into endocrine cells, and the rest downregulate the pancreatic progenitor marker Pdx1 and differentiate into mature pancreatic duct cells with the sustained expression of Sox9, Hnf1, and Hnf6. Ductal cell reprograming to insulin-producing cells as a potential beta cell replacement source for islet auto-transplant recipients stimulated, rapidly enter cell-cycle arrest. Furthermore, these cells expressed beta cell markers and were able to secrete insulin, though not in a glucose-dependent manner. Bioengineering and regeneration of the endocrine pancreas Controversies regarding endocrine differentiation from ductal lineages 401 shown to induce insulin expression. Controversies regarding endocrine differentiation from ductal lineages Although several studies delineate mechanisms of spontaneous post-natal endocrine differentiation from ductal lineages, a few controversies still exist. A report has suggested that the severity and type of pancreatic injury determines which cells are regenerated. Ductal cell reprograming to insulin-producing cells as a potential beta cell replacement source for islet auto-transplant recipients as well as their Ngn3+ precursors in the embryo, failed to contribute to the formation of islet alpha or beta cells after birth,67 as evidenced by in vivo models showing Muc1 lineage-labeled cells confined to just the exocrine compartment. This study questioned the ability of the proliferative parenchyma of the pancreas to enter into beta cell differentiation. The contradictory data in the aforementioned studies could likely be due to the differences in the genetic lineage-tracing tools or the types of injury models employed. Genetic lineage-tracing experiments with pancreatic duct-specific Cre expression have given conflicting results. It is likely that regulator sequences used to trace ductal progenitor capacities may vary. In most of the lineage-tracing models that have been studied so far, none of the studies label the entire population of duct cells, and there is a possibility that a subpopulation of duct cells that exhibit multipotency is not marked effectively by the genetic tools applied. Ductal cell reprogramming to generate insulinproducing beta-like cells has received much attention over the last two decades. Recent models explain several in vitro expansion and differentiation protocols that have achieved beta-like phenotypes within a few weeks. Islets obtained after isolation are then (A) infused (hepatic portal vein, image courtesy Schulze Diabetes Institute, University of Minnesota) back into the same patient (islet autotransplantation) from which the fibrotic pancreas was excised. Bioengineering and regeneration of the endocrine pancreas References 403 a cocktail of transcription factors (Pdx1, Ngn3, MafA, and Pax4) in combination with growth factors. Therefore, full characterization of the genome and subsequent measure of the genomic stability and in vivo behavior of the cells is warranted for further investigations. A thorough literature screen from the past decade has helped identify critical discrepancies when comparing different approaches for the initial characterization of insulin-producing cells to true beta cells. Efforts have been made to explore the progenitor cell population in the native pancreas in the event of an injury with strategies to reprogram the progenitor cell population to a beta cell phenotype. Recent in vivo work utilizing intra-ductal delivery has highlighted the reprogramming potential of the pancreatic duct epithelium as a viable approach for diabetes therapy. Acknowledgments the authors thank the Jewish Heritage Fund for Excellence for providing generous support to their program. The authors sincerely thank Kentucky Organ Donor Affiliates for the supply of human pancreases. Ductal cell reprograming to insulin-producing cells as a potential beta cell replacement source for islet auto-transplant recipients 4. Activation of pancreaticduct-derived progenitor cells during pancreas regeneration in adult rats. Purified human pancreatic duct cell culture conditions defined by serum-free high-content growth factor screening. Plasticity of adult human pancreatic duct cells by neurogenin3-mediated reprogramming. Epithelial cells within the human pancreas do not coexpress mesenchymal antigens: epithelial-mesenchymal transition is an artifact of cell culture. Insulinomaassociated antigen-1 zinc-finger transcription factor promotes pancreatic duct cell trans-differentiation. Culturing and transcriptome profiling of progenitor-like colonies derived from adult mouse pancreas. Insulin-producing cells generated from dedifferentiated human pancreatic beta cells expanded in vitro. Reprogramming mouse cells with a pancreatic duct phenotype to insulin-producing beta-like cells. Growth factors and medium hyperglycemia induce Sox9+ ductal cell differentiation into beta cells in mice with reversal of diabetes. The organoid-initiating cells in mouse pancreas and liver are phenotypically and functionally similar. Combination therapy with epidermal growth factor and gastrin induces neogenesis of human islet beta-cells from pancreatic duct cells and an increase in functional beta-cell mass. In vivo reprogramming of pancreatic acinar cells to three islet endocrine subtypes. Gastrin induces ductal cell dedifferentiation and beta-cell neogenesis after 90% pancreatectomy. Loss of Fbw7 reprograms adult pancreatic ductal cells into alpha, delta, and beta cells. Long-term correction of diabetes in mice by in vivo reprogramming of pancreatic ducts. Pancreatic duct ligation after almost complete beta-cell loss: exocrine regeneration but no evidence of beta-cell regeneration. Continuous cell supply from a Sox9-expressing progenitor zone in adult liver, exocrine pancreas and intestine. Spatiotemporal patterns of multipotentiality in Ptf1a-expressing cells during pancreas organogenesis and injury-induced facultative restoration. Adult duct-lining cells can reprogram into beta-like cells able to counter repeated cycles of toxin-induced diabetes. The ectopic expression of Pax4 in the mouse pancreas converts progenitor cells into alpha and subsequently beta cells. Exocrine-to-endocrine differentiation is detectable only prior to birth in the uninjured mouse pancreas. A single-cell transcriptomic map of the human and mouse pancreas reveals inter- and intracell population structure. Single-cell transcriptome profiling of human pancreatic islets in health and type 2 diabetes. Improved recovery of human islets from young donor pancreases utilizing increased protease dose to collagenase for digesting peri-islet extracellular matrix. Beneficial effect of recombinant rC1rC2 collagenases on human islet function: efficacy of low-dose enzymes on pancreas digestion and yield. Driven by the aim of bringing engineering principles into biology, synthetic biology utilizes existing as well as newly designed genetic materials to generate predictable effects in living cells. Synthetic biology technologies for beta cell generation and are directly activated by small, physiologically inert molecules and other stimuli. Diagnostic strategies, such as the profiling of allergens and whole blood using ex vivo cultures of designer cells, complement this approach. These cells were transfected with a plasmid containing an insulin promoter driving an antibiotic resistance gene, allowing the selection of insulin-positive cells with an appropriate antibiotic-containing medium. These cells, however, did not possess competence for glucose-stimulated insulin secretion, a hallmark of functional beta cells. Prior to the introduction of insulin into diabetes therapy, the loss of beta cells and the consequent lack of insulin were equivalent to a death sentence for these, mostly very young, patients. This was also the first application of a peptide molecule to treat a human disease, and remained so for decades B. Bioengineering and regeneration of the endocrine pancreas Introduction 409 Human pancreatic development the human pancreas is located in the upper left abdomen and is primarily responsible for the secretion of hormones. Most of the information on the development of human pancreas has been obtained from gene knock-in or knock-out experiments primarily conducted in rodents. Lineage tracing, sequencing, and epigenomics technologies coupled with computational methods has enabled reconstruction of the regulatory pathways during the course of human development. Synthetic biology technologies for beta cell generation High expression of Ngn3 overcomes Hes1 repression and subsequently triggers the development of the islet cell types (alpha, beta, delta, gamma, and epsilon) from endocrine progenitor cells. The generated beta cells can be used for cell therapy, disease modeling, and drug discovery applications. Specifically, the dynamics of key transcription factors Neurogenin-3 (Ngn3), pancreatic and duodenal homeobox 1 (Pdx1) and v-maf musculoaponeurotic fibrosarcoma oncogene family (MafA) are presumably important for establishing the gene regulatory network of glucose-sensitive insulin-secreting beta-like cells. Synthetic biology technologies for beta cell generation genome editing in mammalian cells and has also been used to activate, as well as repress, the genes involved in pancreatic differentiation.

Etiopathogenesis and pathophysiology of chronic pancreatitis Sape hypothesis Normal pancreas Initial insult (alcohol etc treatment 1st line buy 20mg valif. The inflammatory cells infiltrate into the pancreas and secrete pro-inflammatory cytokines that activated pancreatic stellate cells and can result in healing medicine queen mary cheap generic valif uk. Alternatively symptoms strep throat valif 20 mg order with amex, recurrence of insults of persistence of inflammation symptoms in dogs buy valif 20mg cheap, can lead further damage of acinar cells and development of fibrosis by activated stellate cells medicine man dispensary buy cheap valif 20mg on line. Various studies have shown no differences in pancreatic sphincter pressures among chronic pancreatitis and controls patients. Conversely, these studies linked to chronic pancreatitis patients due to alcohol consumption and in two of the studies the control patients found to have unexpected abdominal pain or suspected biliary dyskinesia. Patients with chronic pancreatitis and sphincter of Oddi dysfunction were significantly older than those with sphincter of Oddi dysfunction alone. This raises the possibility that sphincter of Oddi dysfunction precedes the development of pancreatitis. The available evidence certainly suggests a link between the sphincter of Oddi dysfunction and chronic pancreatitis. Evaluation of this data can lead to the diagnosis of posttraumatic pancreatitis, a condition which has the potential to develop into a long-standing and obstructive pancreatitis. Lab values and inspection, via both clinical presentation and imaging findings, is crucial to preventing the development of pancreatitis in such cases. Etiopathogenesis and pathophysiology of chronic pancreatitis Tropical chronic pancreatitis Tropical chronic pancreatitis represents an idiopathic, juvenile, nonalcoholic form of chronic pancreatitis that is seen mainly in tropical countries such as Indonesia, south India, and Nigeria. Protein-calorie malnutrition, macronutrient deficiency, and diets high in consumption of cassava (tapioca) predispose to the disease. Tropical chronic pancreatitis may be divided into two stages: tropical calcific pancreatitis and fibrocalculous pancreatic diabetes. Tropical calcific pancreatitis is the early prediabetic stage of the disease affecting the younger population. Tropical calcific pancreatitis is characterized by severe abdominal pain, pancreatic dysfunction without loss of endocrine function, and extensive pancreatic calcification. One of the studies showed that patients with onset of tropical chronic pancreatitis are not malnourished instead they lost weight after disease onset, thus rejecting the hypothesis of malnourishment as a causative factor for tropical chronic pancreatitis. It is likely that in the near future there will be a greater understanding of the pathophysiology of tropical chronic pancreatitis. Early diagnosis and new therapeutic approaches could help ensure better survival and prognosis for patients with tropical chronic pancreatitis. Drug toxicity-induced pancreatitis Drug-induced pancreatitis, much like trauma-induced pancreatitis, is a rare yet serious condition with potential for severe morbidity and mortality. Tests that reveal elevated serum lipase and amylase, as well as other biomarkers such as trypsinogen, C-reactive protein, and pancreatic proteases are part of confirming such a diagnosis. For classification purposes, suspected drugs are placed into five categories based on the evidence that supports the likelihood of the class of drugs being a pancreatitis-inducing agent. Islet auto-transplantation Gallbladder dysfunction 17 and the development of pancreatitis. Symptoms of chronic pancreatitis include abnormalities of the pancreatic duct, but this does not explain if gallstones directly cause chronic pancreatitis. In patients with chronic pancreatitis and cholelithiasis, symptoms in one study reflected complications that resulted from cholelithiasis: jaundice, diarrhea, and abdominal pain, to name a few. The two more obvious pathways are related to gall stone and sludge formation: inflammation (as in the case of bacterial cholecystitis)185 and bile duct obstruction180 leading to elevated pressure in the pancreatic ducts and eventual autodigestion. Persistent formation and passage of gallstones may also lead to ampullary stenosis186 and abnormalities in the sphincter of Oddi. Patients with gall stone disease also showed increase in lipid peroxidation which is a sign of oxidative stress. It can be classified into two forms: early onset (before the age of 35) or late onset (after the age of 35). Whereas late-onset patients suffer from a moderate pain and a milder disease course; however, the damage to the pancreas is extensive causing both endocrine and exocrine insufficiency at diagnosis. These idiopathic cases differ from alcoholic chronic pancreatitis in characteristics. The exact mechanisms by which these mutations affect normal physiological processes, however, still have to be elucidated. Alcohol consumption and tobacco can increase the susceptibility of developing chronic pancreatitis,172 and thus regulation and elimination of use in patients with these genetic mutations may prevent the development of this disorder. A study showed that even alcohol intake below the high consumption threshold can exacerbate A. Etiopathogenesis and pathophysiology of chronic pancreatitis however, there is no clear evidence of gall stone involvement. Additional studies on specific changes induced by gallstone formation may further increase the knowledge on the direct effect of gall stones on chronic pancreatitis. Smoking and pancreatitis Cigarette smoking is a major risk factor for the development of pancreatic disorders, including chronic pancreatitis. Suggested pathways that may be affected by smoking include: · Increased pancreatic fibrosis. Both compounds have been indicated to cause an inflammatory response in prolonged cases of exposure,199 but have additional effects unique to each compound. Nicotine is metabolized through the cytochrome p450 pathway, and chronic pancreatitis patients are noted to have elevated levels of p450,200 indicating a potential pathway through which nicotine may induce pancreatitis. In addition, animal studies have shown that treatment with the nicotinic receptor and calcium channel antagonists limits antisecretory effects seen in rats exposed to nicotine. Furthermore, exposure to nicotine causes increased amyloid precursor protein in stellate cells,202 a key step in fibrosis and yet another characteristic of chronic pancreatitis. It is clear that although research has yet to confirm the exact mechanisms by which tobacco use can lead to chronic pancreatitis, elimination or stemming the use of tobacco products may significantly lower the incidence of chronic pancreatitis. Smoking has been recognized as a major risk factor for the development of chronic pancreatitis in addition to alcohol abuse. Tobacco effect of chronic pancreatitis was first described in 1994, where heavy smokers had a significant risk of developing pancreatic calcifications, however, no impacts of alcohol were found. Recent studies show that tobacco intake is an independent risk factor in chronic pancreatitis, although heavy smokers tend to be heavy drinkers and this accelerates the disease. Early cessation of smoking after the clinical onset of chronic pancreatitis has been shown to reduce the risk of developing calcifications, while smoking is continually associated with an increased risk of disease progression. Pathophysiology the pathophysiology of chronic pancreatitis remains unclear and there are distinct theories of pathogenesis. Several mechanisms have been postulated to be involved in the pathophysiology of chronic pancreatitis. Islet auto-transplantation Endocrine insufficiency and diabetes mellitus 19 considers the direct toxic effect of metabolites (alcohol and tobacco) and other environmental factors on acinar cells, which results in their chronic destruction. Another theory is that an oxidative stress condition of acinar cells causes membrane lipid oxidation which results in the activation of transcription factor nuclear factor kappa B facilitating the release of pro-inflammatory cytokines. Furthermore, oxidative stress can also cause intracellular protease activation by fusion of lysosome and zymogens, causing acinar necrosis, leading to fibrosis. Exocrine insufficiency the process of chronic pancreatitis is complex with uncertain pathogenesis and unpredictable clinical course. Pancreatic exocrine insufficiency is defined as partial or complete loss of digestive enzyme and bicarbonate secretion. Progressive inflammatory destruction of pancreatic tissue in chronic pancreatitis leads to reduced synthesis and secretion of pancreatic enzymes in response to food intake. Clinically, overt malabsorption usually occurs only when enzyme secretion is reduced by >90%. Fat malabsorption leading to steatorrhea usually occurs earlier and is more severe than malabsorption of other nutrients. This is due to an earlier decrease in lipase secretion compared with amylase and proteases,219 higher susceptibility of lipase to acidic pH caused by concomitant impairment of bicarbonate secretion, higher susceptibility of lipase to proteolytic destruction during small intestinal transit, denaturation of bile acids from increased acid and marked inhibition of bile acid secretion. Pancreatic exocrine function is usually preserved longer and consequently, exocrine insufficiency is milder in "early onset" idiopathic chronic pancreatitis in comparison to alcoholic and "late onset" idiopathic chronic pancreatitis. Pancreatic exocrine insufficiency without morphologic alterations is rare (<5%) but possible. In severe cases of pancreatic exocrine insufficiency with <5% of normal enzyme output, about 40% of nutrients from a readily digestible low-calorie meal are malabsorbed. However, even with clinically appropriate doses of pancreatic lipase, duodenal enzyme delivery remains far below physiologic levels and lipid malabsorption is rarely normalized. Steatorrhoea and azotorrhoea, an excessive discharge of nitrogenous substances in the feces, occur when the secretion of lipase and trypsin fall below 5%­10% of normal levels. However, stool characteristics are neither sensitive nor specific for detection of steatorrhoea. This is at least partly due to accelerated gastric emptying and intestinal transit in patients with exocrine insufficiency. Reduced fecal elastase is observed in significantly more individuals suffering from osteoporotic bone fractures than healthy controls (reduction by 65%). Even mild-to-moderate pancreatic exocrine insufficiency has been identified as a risk factor for the development of osteoporosis. Endocrine insufficiency and diabetes mellitus Diabetes secondary to chronic pancreatitis is commonly referred to as pancreatogenic diabetes or type 3c diabetes mellitus. While there is a good understanding of type 1 and type 2 diabetes, type 3c is rarely considered in the current clinical practice. It is a clinically relevant condition with an estimated prevalence of 5%­10% among A. Etiopathogenesis and pathophysiology of chronic pancreatitis all diabetic subjects in Western populations. The incidence of diabetes in chronic pancreatitis patients ranges from 30% to 80% depending on the cohort and duration of follow-up. Chronic pancreatitis induced diabetes is due to destruction of islet cells by pancreatic inflammation. Additionally, poor digestion of nutrients leads to an impaired incretin secretion and consequently decreased insulin release of the remaining beta cells. In contrast to type 1 diabetes mellitus which involves autoimmune destruction of only beta cells in the islets, chronic pancreatitis causes simultaneous destruction of glucagon-secreting alpha-cells and pancreatic polypeptide-cells as well predisposing to a complex deranged metabolic situation. Some have established a positive relationship among control groups, with many patients experiencing relief after endoscopic decompression,139, 140, 254­256 while many others have concluded no difference at all. For these patients, hypertension from ductal obstructions at or near the common channel appears to be a genuine source of pain as surgical reconstruction and stenting (Frey procedure) have shown promise as effective treatments for long-term pain relief. Instead, pain may be relieved by surgically removing portions of the pancreatic head. The widespread effectiveness of these treatments suggests that the underlying maladies responsible for chronic pancreatitis pain in many patients are somehow endemic to the pancreatic head. Complete removal of the organ from procedures like total pancreatectomy and autoislet transplants has shown success as well. Puzzling, however, is the recurrence of pain that up to 30% of patients experience despite complete removal of the organ, which further implicates that plumbing theories provide only part of the bigger picture. Islet auto-transplantation Calcification 21 plumbing theories are to be believed, then inhibition of pancreatic exocrine production should effectively treat pain. Regardless, enzyme replacement therapy has been recognized to achieve some degree of pain relief in a small set of patients and is believed to be most effective for those with "small duct" chronic pancreatitis. Indeed, most chronic pancreatitis patients display some degree of irregular morphology, but morphology alone is a poor predictor for the presence of pain or its severity. Due to limited knowledge of the pathogenesis of chronic pancreatitis pain, treatment is also limited mostly targeting the symptoms rather than the cause of pain. In one study, surgical drainage has resulted in long-term benefit with 37% patients being pain free after 5 years. Calcifications can differ morphologically and in size and may be focal or diffuse throughout the pancreas. These calcifications are like stones present within the tissue itself or inside the pancreatic duct. It has been shown that early smoking cessation after the clinical onset of chronic pancreatitis reduces the risk of developing calcifications, while the continuation of smoking is associated with an increased risk of disease progression. Etiopathogenesis and pathophysiology of chronic pancreatitis Pancreatic calcification is a diagnostic feature of chronic pancreatitis even without clinical signs and symptoms. Pancreatic calcification is observed on radiographs in approximately 30%­50% of patients with chronic pancreatitis in adults. Pancreatic calcification is rarely reported in children under the age of 10, and the incidence increases after this age. The etiopathogenesis of fatty replacement of pancreas still remains elusive; however, several predisposing factors have been suggested. These include age-related, obesity, diabetes mellitus, chronic pancreatitis, hereditary pancreatitis, pancreatic duct obstruction by calculus or tumor, and cystic fibrosis. In normal individuals, only 10% of the parenchyma is enough to maintain normal exocrine function. Ultrasonography has a limited role and can be misleading due to the overlying bowel gas causing obstruction of the pancreas and its fatty infiltration results in increased echogenicity of the pancreatic tissue making its differentiation difficult from normal retroperitoneal fat. Pseudocysts Pancreatic pseudocysts arise as a consequence of pancreatic injury and are a well-known complication of chronic pancreatitis, with a prevalence of 20%­40%. Damage to the acinar cells caused by injury, inflammation, infection, oxidant stress, and ethanol can cause activation of pancreatic stellate cells via pro-inflammatory molecules and growth factors. The activated stellate cells can further release molecules that lead to autocrine activation of pancreatic stellate cells.

The defective glucagon response from transplanted intrahepatic pancreatic islets during hypoglycemia is transplantation site-determined symptoms lead poisoning 20mg valif free shipping. The spleen as an optimal site for islet transplantation and a source of mesenchymal stem cells art of medicine purchase valif 20mg line. The effect of transplantation site and islet mass on longterm survival and metabolic and hormonal function of canine purified islet autografts symptoms 5dp5dt buy 20mg valif with visa. Canine pancreatic islet transplantation: a comparison of two isolation techniques medications via endotracheal tube valif 20mg order fast delivery. Normoglycemia after reflux of islet-containing pancreatic fragments into the splenic vascular bed in dogs treatment type 2 diabetes purchase valif online. Exocrine contamination impairs implantation of pancreatic islets transplanted beneath the kidney capsule. Insulin and glucagon secretion in streptozotocin-diabetic rats: influences of islets transplanted to the renal subcapsular space. Islet transplantation to the renal subcapsular space in streptozotocin-diabetic rats: short-term effects on glucose-stimulated insulin secretion. Islet transplantation to the renal subcapsular space improves late complications in streptozotocin-diabetic rats. Comparison of the portal vein and kidney subcapsule as sites for primate islet autotransplantation. Prolongation of islet graft survival using concomitant transplantation of islets and vascular endothelial cells in diabetic rats. Co-transplantation of mesenchymal stem cells maintains islet organisation and morphology in mice. Expansion of transplanted islets in mice by cotransplantation with adipose tissue-derived mesenchymal stem cells. Intraportal vs kidney subcapsular site for human pancreatic islet transplantation. Transplantation of pancreatic islets to adrenal gland is promoted by agonists of growth-hormone-releasing hormone. Anti-diabetic and neuroprotective effects of pancreatic islet transplantation into the central nervous system. Successful intracerebral allotransplantation of purified pancreatic endocrine cells in diabetic rat. Intracerebral allotransplantation of purified pancreatic endocrine cells and pancreatic islets in diabetic rats. Intracerebral xenotransplantation of semipermeable membrane-encapsuled pancreatic islets. Intracranial pancreatic islet transplantation increases islet hormone expression in the 54. Effects of intratesticular islet transplantation on hepatic glycogen metabolism in the rat. Testicular immune privilege promotes transplantation tolerance by altering the balance between memory and regulatory T cells. Long-term survival of intratesticular porcine islets in nonimmunosuppressed beagles. Induction of donor-specific unresponsiveness by intrathymic islet transplantation. Survival and function of syngeneic rat islet grafts placed within the thymus versus under the kidney capsule. Successful engraftment of autologous and allogeneic islets into the porcine thymus. Histological and functional evidence of autologous intrathymic islet engraftment and survival in pancreatectomized recipients. Morphological findings in long-term pancreatic tissue transplants in the anterior eye chamber of rats. Noninvasive high-resolution in vivo imaging of cell biology in the anterior chamber of the mouse eye. Noninvasive in vivo model demonstrating the effects of autonomic innervation on pancreatic islet function. Light scattering as an intrinsic indicator for pancreatic islet cell mass and secretion. The anterior chamber of the eye is a transplantation site that supports and enables visualisation of beta cell development in mice. The anterior chamber of the eye as a clinical transplantation site for the treatment of diabetes: a study in a baboon model of diabetes. Implanted islets in the anterior chamber of the eye are prone to autoimmune attack in a mouse model of diabetes. Islet allotransplantation in the bone marrow of patients with type 1 diabetes: a pilot randomized trial. Evaluation of alternative sites for islet transplantation in the minipig: interest and limits of the gastric submucosa. Gastric submucosa is inferior to the liver as transplant site for autologous islet transplantation in pancreatectomized diabetic Beagles. Small bowel subserosal space as a site for islet transplantation and local drug delivery. Pancreas Islet transplantation in the genitourinary tract associated with renal transplantation: an experimental study. More than 1,000 cases of total parathyroidectomy with forearm autograft for renal hyperparathyroidism. Tissue culture preservation and intramuscular transplantation of pancreatic islets. Intramuscular autotransplantation of pancreatic islets in a 7-year-old child: a 2-year follow-up. High vascular density and oxygenation of pancreatic islets transplanted in clusters into striated muscle. Sustained reversal of diabetes following islet transplantation to striated musculature in the rat. Islet survival and function following intramuscular autotransplantation in the minipig. Bioartificial pancreas transplantation at prevascularized intermuscular space: effect of angiogenesis induction on islet survival. Effects of systemic immunosuppression on islet engraftment and function into a subcutaneous biocompatible device. A novel device for islet transplantation providing immune protection and oxygen 116. Transplantation of macroencapsulated human islets within the bioartificial pancreas Air to patients with type 1 diabetes mellitus. Diabetes is reversed in a murine model by marginal mass syngeneic islet transplantation using a subcutaneous cell pouch device. A prevascularized subcutaneous device-less site for islet and cellular transplantation. Long-term function and optimization of mouse and human islet transplantation in the subcutaneous device-less site. The efficacy of intraperitoneal pancreatic islet isografts in the reversal of diabetes in rats. Indefinite islet protection from autoimmune destruction in nonobese diabetic mice by agarose microencapsulation without immunosuppression1. Intraperitoneal transplantation of microencapsulated canine islet allografts with short-term, low-dose cyclosporine for treatment of pancreatectomy-induced diabetes in dogs. A recommended laparoscopic procedure for implantation of microcapsules in the peritoneal cavity of non-human primates. Intraperitoneal alginate-encapsulated neonatal porcine islets in a placebocontrolled study with 16 diabetic cynomolgus primates. Microencapsulated pancreatic islet allografts into nonimmunosuppressed patients with type 1 diabetes: first two cases. Long-term metabolic and immunological follow-up of nonimmunosuppressed patients with type 1 diabetes treated with microencapsulated islet allografts: four cases. Site for unpurified islet transplantation is an important parameter for determination of the outcome of graft survival and function. Islet autotransplantation into an omental or splenic site results in a normal beta cell but abnormal alpha cell response to mild non-insulininduced hypoglycemia. Survival and function of purified islets in the omental pouch site of outbred dogs. A novel technique for the transplantation of pancreatic islets within a vascularized device into the greater omentum to achieve insulin independence. Islet allo-transplantation Index Note: Page numbers followed by f indicate figures and t indicate tables. Etiopathogenesis and pathophysiology of chronic pancreatitis Chronic pancreatitis is commonly defined as a continuous, chronic, fibro-inflammatory process of the pancreas, characterized by irreversible morphologic changes. The endocrine compartment contains the islet cells (islets of Langerhans) that synthesize and release hormones including insulin, glucagon, somatostatin, and pancreatic polypeptide into the bloodstream to maintain glucose homeostasis in the body. The exocrine components comprise >95% and the islets makeup 1%­2% of pancreatic mass. Pancreatitis can be either acute or chronic: the two conditions are characterized by significantly different clinical, morphological, and histological changes. Chronic pancreatitis is an inflammatory disease primarily affecting the exocrine compartment, but in later stages, it can affect the endocrine function as well. It is characterized by progressive inflammation and fibrosis of pancreas leading to irreversible damage. This leads to irreversible morphological and structural changes resulting in impairment of exocrine and endocrine functions. The incidence, prevalence, morbidity, and mortality of chronic pancreatitis vary between countries due to differences in study design, diagnostic criteria, and geography. In the United States, the annual incidence of chronic pancreatitis is estimated to be approximately 5­12/100,000 persons and the prevalence is about 50/100,000 persons. A recent survey conducted in Asia reveals much greater incidence rates of chronic pancreatitis than the United States. Islet auto-transplantation Alcohol-induced chronic pancreatitis 7 Although diverse risk factors can cause chronic pancreatitis, alcohol abuse is the major cause in the western population constituting up to 90% of the cases. Moreover, certain genetic mutation/hereditary conditions predispose individuals to acute/ chronic pancreatic inflammation which may be exacerbated by environmental factors. Acinar cell damage by gain/loss of function by mutation of key proteins involved in activation and inhibition of digestive enzymes may lead to chronic pancreatitis. Genetic/hereditary pancreatitis and cystic fibrosis leading to chronic pancreatitis have an early onset and are characterized by prominent pancreatic calcification. In some cases, obstruction of the duct by stones causes an increase in pancreas ductal pressure and eventual autodigestion of the acinar cells which can progress to develop into chronic pancreatitis. Duct obstruction or blockage by protein plugs or gall stones have been associated with the disease. Chronic obstructive pancreatitis can result from congenital ductal anomalies such as pancreas divisum. The pathogenesis of chronic pancreatitis due to pancreas divisum and sphincter of Oddi disorders remains somewhat uncertain. Tropical pancreatitis is another type of chronic pancreatitis seen mainly in tropical countries. It occurs usually in young people, involves the main pancreatic duct and causes ductal calculi. Fortunately, the pancreas has a good functional reserve, and nearly 90% of function can be lost before any clinical manifestation. The parenchymal architecture of the pancreas is completely lost, with major changes in the duct ranging from obstruction to dilatation and/or distortion. Pancreatic inflammation causes intense abdominal pain, and, over time, chronic inflammation can cause irreversible morphological changes and fibrosis. The exocrine pancreatic function includes the acinar cells, which secrete digestive enzymes that are transported through the pancreatic duct into the small intestine. The endocrine function regulated by the islets of Langerhans cells involves the secretion of pancreatic hormones glucagon, insulin, and somatostatin by alpha, beta, and delta cells respectively. Continuous insults lead to recurrent episodes of acute pancreatitis, which activates pancreatic stellate cells and initiate pancreatic fibrosis. The pain begins to reduce in frequency and intensity over time, but gland destruction is underlying which leads to exocrine and endocrine insufficiency. The pancreas becomes severely fibrotic and atrophic in the later stages of the disease. Alcoholic chronic pancreatitis patients have a higher risk of developing pancreatic ductal adenocarcinoma. Protein precipitation resulting from alcohol consumption may lead to ductal blockage causing acinar atrophy and fibrosis. Ethanol has a pro-secretory effect on gastric acid at lower concentrations and inhibitory effect on secretion at higher concentrations. Although the exact mechanisms of these pathways to cause damage have yet to be elucidated, hypotheses that range from hypoxia 41 due to decreased blood flow and pancreatic fibrosis due to stellate cell activation 42 all provide a greater perspective on how these pathways are integrated. Preclinical models of pancreatitis have reported a shift toward necrotic from apoptotic cell death pathway upon ethanol uptake. Persistent increase in calcium concentration leads to mitochondrial depolarization. Pancreatic stellate cells are activated by ethanol via its metabolite acetaldehyde (Ac) and the generation of oxidant stress.

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