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Pancreas cells transplantation

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https://www.readbyqxmd.com/read/28397982/generation-of-chimeric-minipigs-by-aggregating-4-to-8-cell-stage-blastomeres-from-somatic-cell-nuclear-transfer-with-the-tracing-of-enhanced-green-fluorescent-protein
#1
Huili Ji, Chuan Long, Chong Feng, Ningning Shi, Yingdi Jiang, Guomin Zeng, Xirui Li, Jingjing Wu, Lin Lu, Shengsheng Lu, Dengke Pan
BACKGROUND: Blastocyst complementation is an important technique for generating chimeric organs in organ-deficient pigs, which holds great promise for solving the problem of a shortage of organs for human transplantation procedures. Porcine chimeras have been generated using embryonic germ cells, embryonic stem cells, and induced pluripotent stem cells; however, there are no authentic pluripotent stem cells for pigs. In previous studies, blastomeres from 4- to 8-cell-stage parthenogenetic embryos were able to generate chimeric fetuses efficiently, but the resulting fetuses did not produce live-born young...
April 11, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/28397308/improvement-of-isolated-caprine-islet-survival-and-functionality-in-vitro-by-enhancing-of-pdx1-gene-expression
#2
Homayoun Hani, Zeenathul Nazariah Allaudin, Mohd-Azmi Mohd-Lila, Kazhal Sarsaifi, Mina Rasouli, Yew Joon Tam, Tengku-Azmi Tengku-Ibrahim, Abas Mazni Othman
BACKGROUND: Dead islets replaced with viable islets are a promising offer to restore normal insulin production to a person with diabetes. The main reason for establishing a new islet source for transplantation is the insufficiency of human donor pancreas while using xenogeneic islets perhaps assists this problem. The expression of PDX1 is essential for the pancreas expansion. In mature β-cells, PDX1 has several critical roles such as glucose sensing, insulin synthesis, and insulin secretion...
April 11, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/28385600/mesenchymal-stem-cells-and-differentiated-insulin-producing-cells-are-new-horizons-for-pancreatic-regeneration-in-type-i-diabetes-mellitus
#3
Ayat M Domouky, Ashraf S Hegab, Amal Al-Shahat, Nermin Raafat
BACKGROUND: Diabetes mellitus has become the third human killer following cancer and cardiovascular disease. Millions of patients, often children, suffer from type 1 diabetes (T1D). Stem cells created hopes to regenerate damaged body tissues and restore their function. AIM: This work aimed at clarifying and comparing the therapeutic potential of differentiated and non-differentiated mesenchymal stem cells (MSCs) as a new line of therapy for T1D. METHODS: 40 Female albino rats divided into group I (control): 10 rats and group II (diabetic), III and IV, 10 rats in each, were injected with streptozotocin (50mg/kg body weight)...
April 3, 2017: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/28362046/co-microencapsulation-of-bmscs-and-mouse-pancreatic-%C3%AE-cells-for-improving-the-efficacy-of-type-i-diabetes-therapy
#4
Ruimin Long, Yuangang Liu, Shibin Wang, Li Ye, Peng He
INTRODUCTION: To overcome the shortcomings of pancreas transplantation and insulin injection treatment for type I diabetes, biocompatible materials were used to prepare alginate-chitosan-alginate microcapsules that co-encapsulated bone marrow mesenchymal stem cells and mouse pancreatic β cells to treat diabetic mice. METHODS: Blank alginate-chitosan-alginate (ACA) microcapsules and co-microencapsulated cells were prepared using a high-voltage electrostatic method and then characterized using an inverted microscope...
March 21, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28360408/senescence-of-pancreas-in-middle-aged-rats-with-normal-vascular-function
#5
Mohamad Kassem, Zahid Rasul Niazi, Malak Abbas, Ali El Habhab, Guillaume Kreutter, Sonia Khemais-Benkhiat, Cyril Auger, Maria-Cristina Antal, Valérie B Schini-Kerth, Florence Toti, Laurence Kessler
BACKGROUND In organ transplantation, particularly pancreas transplantation, donor age is a determinant factor for graft survival. Physiological aging is crucial in the progressive deterioration of organs in adulthood. We compared the senescence and function features of pancreas and vascular tissues in young rats and middle-aged rats. MATERIAL AND METHODS Islet morphology and the area of cells secreting insulin or glucagon was investigated using immunohistology in young rats (12 weeks) and middle-aged rats (52 weeks) (n=8)...
March 31, 2017: Annals of Transplantation: Quarterly of the Polish Transplantation Society
https://www.readbyqxmd.com/read/28360105/demethylation-of-induced-pluripotent-stem-cells-from-type-1-diabetic-patients-enhances-differentiation-into-functional-pancreatic-%C3%AE-cells
#6
Gohar S Manzar, Eun-Mi Kim, Nicholas Zavazava
Type 1 diabetes (T1D) can be managed by transplanting either the whole pancreas or isolated pancreatic islets. However, cadaveric pancreas is scarcely available for clinical use, limiting this approach. As such, there is a great need to identify alternative sources of clinically usable pancreatic tissues. Here, we used induced pluripotent stem (iPS) cells derived from patients with T1D to generate glucose-responsive, insulin-producing cells (IPCs) via 3D culture. Initially, T1D iPS cells were resistant to differentiation, but transient demethylation treatment significantly enhanced IPC yield...
March 30, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28324008/vessel-network-architecture-of-adult-human-islets-promotes-distinct-cell-cell-interactions-in-situ-and-is-altered-after-transplantation
#7
Christian M Cohrs, Chunguang Chen, Stephan R Jahn, Julia Stertmann, Helena Chmelova, Jürgen Weitz, Andrea Bähr, Nikolai Klymiuk, Anja Steffen, Barbara Ludwig, Virginia Kamvissi, Eckhard Wolf, Stefan R Bornstein, Michele Solimena, Stephan Speier
Islet cell hormone release is modulated by signals from endothelial and endocrine cells within the islet. However, models of intra-islet vascularization and paracrine cell signaling are mostly based on rodent pancreas. We here assessed for the first time the architecture and endocrine cell interaction of the vascular network in unperturbed human islets in situ and their potential to re-establish their endogenous vascular network after transplantation in vivo. We prepared pancreas tissue slices of fresh tissue obtained from non-diabetic patients undergoing partial pancreatectomy...
January 27, 2017: Endocrinology
https://www.readbyqxmd.com/read/28297573/magnetic-resonance-imaging-guided-delivery-of-neural-stem-cells-into-the-basal-ganglia-of-nonhuman-primates-reveals-a-pulsatile-mode-of-cell-dispersion
#8
Kristen E Malloy, Jinqi Li, Gourav R Choudhury, April Torres, Shruti Gupta, Chris Kantorak, Tim Goble, Peter T Fox, Geoffrey D Clarke, Marcel M Daadi
Optimal stem cell delivery procedures are critical to the success of the cell therapy approach. Variables such as flow rate, suspension solution, needle diameter, cell density, and tissue mechanics affect tissue penetration, backflow along the needle, and the dispersion and survival of injected cells during delivery. Most cell transplantation centers engaged in human clinical trials use custom-designed cannula needles, syringes, or catheters, sometimes precluding the use of magnetic resonance imaging (MRI)-guided delivery to target tissue...
March 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28286566/gastrointestinal-manifestations-of-mitochondrial-disorders-a-systematic-review
#9
REVIEW
Josef Finsterer, Marlies Frank
Mitochondrial disorders (MIDs) due to respiratory-chain defects or nonrespiratory chain defects are usually multisystem conditions [mitochondrial multiorgan disorder syndrome (MIMODS)] affecting the central nervous system (CNS), peripheral nervous system, eyes, ears, endocrine organs, heart, kidneys, bone marrow, lungs, arteries, and also the intestinal tract. Frequent gastrointestinal (GI) manifestations of MIDs include poor appetite, gastroesophageal sphincter dysfunction, constipation, dysphagia, vomiting, gastroparesis, GI pseudo-obstruction, diarrhea, or pancreatitis and hepatopathy...
January 2017: Therapeutic Advances in Gastroenterology
https://www.readbyqxmd.com/read/28280376/single-donor-islet-transplantation-in-type-1-diabetes-patient-selection-and-special-considerations
#10
REVIEW
Jacob A Tatum, Max O Meneveau, Kenneth L Brayman
Type 1 diabetes mellitus is an autoimmune disorder of the endocrine pancreas that currently affects millions of people in the United States. Although the disease can be managed with exogenous insulin administration, the ultimate cure for the condition lies in restoring a patient's ability to produce their own insulin. Islet cell allotransplantation provides a means of endogenous insulin production. Though far from perfected, islet transplants are now a proven treatment for type 1 diabetics. However, proper patient selection is critical for achieving optimal outcomes...
2017: Diabetes, Metabolic Syndrome and Obesity: Targets and Therapy
https://www.readbyqxmd.com/read/28279194/crispr-targeted-genome-editing-of-mesenchymal-stem-cell-derived-therapies-for-type-1-diabetes-a-path-to-clinical-success
#11
REVIEW
Dario Gerace, Rosetta Martiniello-Wilks, Najah Therese Nassif, Sara Lal, Raymond Steptoe, Ann Margaret Simpson
Due to their ease of isolation, differentiation capabilities, and immunomodulatory properties, the therapeutic potential of mesenchymal stem cells (MSCs) has been assessed in numerous pre-clinical and clinical settings. Currently, whole pancreas or islet transplantation is the only cure for people with type 1 diabetes (T1D) and, due to the autoimmune nature of the disease, MSCs have been utilised either natively or transdifferentiated into insulin-producing cells (IPCs) as an alternative treatment. However, the initial success in pre-clinical animal models has not translated into successful clinical outcomes...
March 9, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28272465/reconstituting-development-of-pancreatic-intraepithelial-neoplasia-from-primary-human-pancreas-duct-cells
#12
Jonghyeob Lee, Emily R Snyder, Yinghua Liu, Xueying Gu, Jing Wang, Brittany M Flowers, Yoo Jung Kim, Sangbin Park, Gregory L Szot, Ralph H Hruban, Teri A Longacre, Seung K Kim
Development of systems that reconstitute hallmark features of human pancreatic intraepithelial neoplasia (PanINs), the precursor to pancreatic ductal adenocarcinoma, could generate new strategies for early diagnosis and intervention. However, human cell-based PanIN models with defined mutations are unavailable. Here, we report that genetic modification of primary human pancreatic cells leads to development of lesions resembling native human PanINs. Primary human pancreas duct cells harbouring oncogenic KRAS and induced mutations in CDKN2A, SMAD4 and TP53 expand in vitro as epithelial spheres...
March 8, 2017: Nature Communications
https://www.readbyqxmd.com/read/28272287/risk-factors-and-outcomes-of-de-novo-cancers-excluding-nonmelanoma-skin-cancer-after-liver-transplantation-for-primary-sclerosing-cholangitis
#13
Mohamad A Mouchli, Siddharth Singh, Edward V Loftus, Lisa Boardman, Jayant Talwalkar, Charles B Rosen, Julie K Heimbach, Russell H Wiesner, Bashar Hasan, John J Poterucha, Kymberly D Watt
BACKGROUND: Patients with primary sclerosing cholangitis (PSC) may be at higher of risk of malignancy after liver transplantation (LT) compared to other LT recipients. We aimed to determine the cumulative incidence of/risk factors for and long-term cancer-related mortality in patients with PSC after LT. METHODS: All adult patients who underwent LT for PSC without cholangiocarcinoma from 1984-2012, with follow-up through June 2015. We estimated cumulative incidence, risk factors and mortality from de novo malignancies after LT RESULTS: 293 patients were identified (mean age, 47±12 years; 63...
March 8, 2017: Transplantation
https://www.readbyqxmd.com/read/28255902/imaging-spectrum-of-central-nervous-system-complications-of-hematopoietic-stem-cell-and-solid-organ-transplantation
#14
REVIEW
Andrés Server, Nuria Bargalló, Yngvar Fløisand, Jon Sponheim, Francesc Graus, John K Hald
Neurologic complications are common after hematopoietic stem cell transplantation (HSCT) and solid organ transplantation (SOT) and affect 30-60% of transplant recipients. The aim of this article is to provide a practical imaging approach based on the timeline and etiology of CNS abnormalities, and neurologic complications related to transplantation of specific organs. The lesions will be classified based upon the interval from HSCT procedure: pre-engraftment period <30 days, early post-engraftment period 30-100 days, late post-engraftment period >100 days, and the interval from SOT procedure: postoperative phase 1-4 weeks, early posttransplant syndromes 1-6 months, late posttransplant syndromes >6 months...
March 2, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28252345/evidence-of-stress-in-%C3%AE-cells-obtained-with-laser-capture-microdissection-from-pancreases-of-brain-dead-donors
#15
Aref Ebrahimi, Min-Ho Jung, Jonathan M Dreyfuss, Hui Pan, Dennis Sgroi, Susan Bonner-Weir, Gordon C Weir
Isolated islets used for transplantation are known to be stressed, which can result from the circumstances of death, in particular brain death, the preservation of the pancreas with its warm and cold ischemia, from the trauma of the isolation process, and the complex events that occur during tissue culture. The current study focused upon the events that occur before the islet isolation procedure. Pancreases were obtained from brain dead donors (n = 7) with mean age 50 (11) and normal pancreatic tissue obtained at surgery done for pancreatic neoplasms (n = 7), mean age 69 (9)...
March 4, 2017: Islets
https://www.readbyqxmd.com/read/28249332/pancreas-transplantation-delays-the-progression-of-morphological-morphometric-and-ultrastructural-changes-in-testes-of-alloxan-induced-diabetic-rats
#16
César Tadeu Spadella, Amélia Arcângela Teixeira Trindade, Amanda Natália Lucchesi, Célia Sperandéo de Macedo
Aim: The aim of this study was to assess the effects of pancreas transplantation on the progression of testicular lesions in diabetic rats. Methods: Diabetic rats were subjected to pancreas transplantation and sacrificed after 6, 14, 26 and 50 weeks of follow-up, using non-diabetic and untreated diabetic rats as controls. Results: Successful pancreas transplantation corrected all of the metabolic changes observed in diabetic rats, including low levels of testosterone. The testicular mass was decreased, and the relative weight of the testes was high in diabetic rats...
February 2017: Experimental and Clinical Endocrinology & Diabetes
https://www.readbyqxmd.com/read/28230643/mtor-inhibition-clinical-transplantation-pancreas-islet
#17
Thierry Berney, Axel Andres, Christian Toso, Pietro Majno, Jean-Paul Squifflet
This brief overview discusses the beneficial and deleterious effects of mTOR inhibitors on beta-cells, and how sirolimus- and everolimus-based immunosuppression have impacted on practices and outcomes of pancreas and islet transplantation. Sirolimus was the cornerstone of immunosuppressive regimens in islet transplantation at the turn of the millenium, but utilization of mTOR inhibitors has progressively decreased from >80% to <50% of islet transplant recipients in more recent years. For whole pancreas transplantation, mTOR inhibitors were used in approximately 20% of patients in the early 2000s, but this dropped over the years to <10% currently...
February 23, 2017: Transplantation
https://www.readbyqxmd.com/read/28222054/ucp2-expression-is-increased-in-pancreas-from-brain-dead-donors-and-involved-in-cytokine-induced-%C3%AE-cells-apoptosis
#18
Leticia A Brondani, Tatiana H Rech, Gabriela Boelter, Andrea C Bauer, Cristiane B Leitão, Décio L Eizirik, Daisy Crispim
BACKGROUND: Systemic inflammation associated with brain death (BD) decreases islet yield and quality, negatively affecting outcomes of human islet transplantation. A recent study from our group showed an increased expression of uncoupling protein-2 (UCP2) in pancreas from rats with BD as compared with controls. UCP2 is located in the mitochondrial inner membrane and regulates production of reactive oxygen species and glucose-stimulated insulin secretion. It has been suggested that UCP2 also plays a role in β cell apoptosis, but these findings remain controversial...
March 2017: Transplantation
https://www.readbyqxmd.com/read/28174674/the-evaluation-of-islet-purification-methods-that-use-large-bottles-to-create-a-continuous-density-gradient
#19
Chika Miyagi-Shiohira, Naoya Kobayashi, Issei Saitoh, Masami Watanabe, Yasufumi Noguchi, Masayuki Matsushita, Hirofumi Noguchi
Islet purification is one of the most important steps of islet isolation for pancreatic islet transplantation. The most common method of islet purification is density gradient centrifugation using a COBE 2991 cell processor. However, this method can damage islets mechanically through its high shearing force. We recently reported that a new purification method using large plastic bottles effectively achieves a high yield of islets from the porcine pancreas. In the present study, we evaluated the methods of making a continuous density gradient...
January 8, 2017: Cell Medicine
https://www.readbyqxmd.com/read/28164137/immune-responses-to-tissue-restricted-nonmajor-histocompatibility-complex-antigens-in-allograft-rejection
#20
REVIEW
Ankit Bharat, T Mohanakumar
Chronic diseases that result in end-stage organ damage cause inflammation, which can reveal sequestered self-antigens (SAgs) in that organ and trigger autoimmunity. The thymus gland deletes self-reactive T-cells against ubiquitously expressed SAgs, while regulatory mechanisms in the periphery control immune responses to tissue-restricted SAgs. It is now established that T-cells reactive to SAgs present in certain organs (e.g., lungs, pancreas, and intestine) are incompletely eliminated, and the dysregulation of peripheral immuneregulation can generate immune responses to SAgs...
2017: Journal of Immunology Research
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