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pancreas transplantation islets

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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
#1
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/28319566/pancreas-transplantation-from-pediatric-donors-a-unos-registry-analysis
#2
Mario Spaggiari, Martha Bissing, Maya Campara, Chun-Chieh Yeh, Ivo Tzvetanov, Hoonbae Jeon, Enrico Benedetti
BACKGROUND: Pancreas grafts from pediatric donors are still considered "not ideal". Perceived concerns are related to low islet mass and potential for graft thrombosis. METHODS: The study evaluated all pancreas transplants from January 2000 to May 2015 using the Organ Procurement and Transplant Network (OPTN) database. Comparative analysis of recipient and graft survival was performed between pediatric (≤18 years) and adult donors. In the pediatric group, the outcomes were stratified based on donor age (≤ 6 years; 7-12 years; 13-18 years) and weight (<30 kg; 30-95 Kg; >95 kg)...
March 18, 2017: Transplantation
https://www.readbyqxmd.com/read/28280376/single-donor-islet-transplantation-in-type-1-diabetes-patient-selection-and-special-considerations
#3
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
#4
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/28266040/ex-vivo-porcine-organ-perfusion-models-as-a-suitable-platform-for-translational-transplant-research
#5
Rohan Kumar, Wen Yuan Chung, Ashley Robert Dennison, Giuseppe Garcea
In transplantation surgery, extending the criteria for organ donation to include organs that may have otherwise been previously discarded has provided the impetus to improve organ preservation. The traditional method of cold static storage (CS) has been tried and tested and is suitable for organs meeting standard criteria donation. Ex vivo machine perfusion is, however, associated with evidence suggesting that it may be better than CS alone and may allow for organ donation criteria to be extended. Much of our knowledge of organ preservation is derived from animal studies...
March 6, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28252345/evidence-of-stress-in-%C3%AE-cells-obtained-with-laser-capture-microdissection-from-pancreases-of-brain-dead-donors
#6
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/28230643/mtor-inhibition-clinical-transplantation-pancreas-islet
#7
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
#8
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/28201960/hypoglycemia-and-glucocorticoid-free-immunosuppression-are-related-with-low-dehydroepiandrosterone-sulfate-level
#9
Martina Zahradnicka, Frantisek Saudek, Kvetoslav Lipar, Jelena Skibova
BACKGROUND: Low dehydroepiandrosterone sulfate (DHEAS) levels and a high cortisol/DHEAS ratio are associated with higher mortality in elderly, dialyzed, and immunocompromised patients. The role of these hormones in patients with hypoglycemia unawareness (hypo) or in pancreas or islet recipients treated by glucocorticoid-free immunosuppressive regimen (IS) has not been studied. OBJECTIVE: The aim of this study was to determine the effects of IS and of recurrent hypoglycemia on DHEAS and adrenocorticotropic hormone (ACTH) levels in patients with type-1 diabetes (T1DM)...
February 13, 2017: Endocrine, Metabolic & Immune Disorders Drug Targets
https://www.readbyqxmd.com/read/28188872/pre-transplantation-31-p-magnetic-resonance-spectroscopy-for-quality-assessment-of-human-pancreatic-grafts-a-feasibility-study
#10
Lina Carlbom, Jan Weis, Lars Johansson, Olle Korsgren, Håkan Ahlström
OBJECTIVE: To investigate the feasibility of using (31)P-MRS for objective non-invasive quality assessment of human pancreas grafts prior to transplantation or islet isolation. MATERIALS AND METHODS: Pancreata from 5 human donors, 3 males and 2 females, aged 49-78years, with body mass index (BMI) 22-31kg/m(2), were included. Pancreata were perfused with histidine-tryptophan-ketoglutarate solution during procurement and stored in hypothermic condition (4°C) for 21-44h...
February 8, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28174674/the-evaluation-of-islet-purification-methods-that-use-large-bottles-to-create-a-continuous-density-gradient
#11
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/28150744/engineering-an-endocrine-neo-pancreas-by-repopulation-of-a-decellularized-rat-pancreas-with-islets-of-langerhans
#12
H Napierala, K-H Hillebrandt, N Haep, P Tang, M Tintemann, J Gassner, M Noesser, H Everwien, N Seiffert, M Kluge, E Teegen, D Polenz, S Lippert, D Geisel, A Reutzel Selke, N Raschzok, A Andreou, J Pratschke, I M Sauer, B Struecker
Decellularization of pancreata and repopulation of these non-immunogenic matrices with islets and endothelial cells could provide transplantable, endocrine Neo- Pancreata. In this study, rat pancreata were perfusion decellularized and repopulated with intact islets, comparing three perfusion routes (Artery, Portal Vein, Pancreatic Duct). Decellularization effectively removed all cellular components but conserved the pancreas specific extracellular matrix. Digital subtraction angiography of the matrices showed a conserved integrity of the decellularized vascular system but a contrast emersion into the parenchyma via the decellularized pancreatic duct...
February 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28135283/the-spleen-is-an-ideal-site-for-inducing-transplanted-islet-graft-expansion-in-mice
#13
Takeshi Itoh, Hitomi Nishinakamura, Kenjiro Kumano, Hiroyuki Takahashi, Shohta Kodama
Alternative islet transplantation sites have the potential to reduce the marginal number of islets required to ameliorate hyperglycemia in recipients with diabetes. Previously, we reported that T cell leukemia homeobox 1 (Tlx1)+ stem cells in the spleen effectively regenerated into insulin-producing cells in the pancreas of non-obese diabetic mice with end-stage disease. Thus, we investigated the spleen as a potential alternative islet transplantation site. Streptozotocin-induced diabetic C57BL/6 mice received syngeneic islets into the portal vein (PV), beneath the kidney capsule (KC), or into the spleen (SP)...
2017: PloS One
https://www.readbyqxmd.com/read/28130838/production-of-high-quality-islets-from-goettingen-minipigs-choice-of-organ-preservation-solution-donor-pool-and-optimal-cold-ischemia-time
#14
Anja Steffen, Thomas Kiss, Janine Schmid, Undine Schubert, Sophie Heinke, Susann Lehmann, Stefan Bornstein, Barbara Ludwig, Stefan Ludwig
BACKGROUND: The transplantation of porcine islets into man might soon become reality for patients with type 1 diabetes mellitus. Therefore, porcine islets of high quality and quantity, and a scalable isolation process with strict quality control will be an unconditional prerequisite to enable the best possible transplantation graft. In this study, we provide a comparative study evaluating islet isolation outcome and in vitro survival based upon donor age, organ preservation solution (OPS), and cold ischemia time (CIT)...
January 28, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/28101160/facile-mechanical-shaking-method-is-an-improved-isolation-approach-for-islet-preparation-and-transplantation
#15
Nina Yin, Tao Chen, Yuling Yu, Yongming Han, Fei Yan, Zhou Zheng, Zebin Chen
Successful islet isolation is crucial for islet transplantation and cell treatment for type 1 diabetes. Current isolation methods are able to obtain 500-1,000 islets per rat, which results in a waste of ≥50% of total islets. In the present study, a facile mechanical shaking method for improving islet yield (up to 1,500 per rat) was developed and summarized, which was demonstrated to be more effective than the existing well-established stationary method. The present results showed that isolated islets have a maximum yield of 1,326±152 when shaking for 15 min for the fully-cannulated pancreas...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28017506/insulin-producing-cells-generation-by-overexpression-of-mir-375-in-adipose-derived-mesenchymal-stem-cells-from-diabetic-patients
#16
Mehran Piran, Seyed Ehsan Enderami, Mehrdad Piran, Hadis Soltani Sedeh, Ehsan Seyedjafari, Abdolreza Ardeshirylajimi
Diabetes Mellitus (DM) is a systematic disease, which happens because of destruction of islets of Langerhans in the pancreas and systematic resistance to insulin. The lack of donor for pancreas transplantation and risk of transplant rejection is the main challenge in the treatment of this disease. Stem cells are proper and sufficient source for creating insulin-producing cells (IPC). In this study adipose tissue was provided from diabetic patients operated for liposuction and then adipose derived stem cells (ADSCs) were isolated, characterized and then treated by lentiviruses containing miR-375, after 7, 14 and 21 days of induction, islet-like clusters (ILC) specific genes including insulin and PDX1 were evaluated by Real Time RT-PCR...
December 22, 2016: Biologicals: Journal of the International Association of Biological Standardization
https://www.readbyqxmd.com/read/28008169/advances-in-islet-encapsulation-technologies
#17
REVIEW
Tejal Desai, Lonnie D Shea
Type 1 diabetes is an autoimmune disorder in which the immune system attacks and destroys insulin-producing islet cells of the pancreas. Although islet transplantation has proved to be successful for some patients with type 1 diabetes, its widespread use is limited by islet donor shortage and the requirement for lifelong immunosuppression. An encapsulation strategy that can prevent the rejection of xenogeneic islets or of stem cell-derived allogeneic islets can potentially eliminate both of these barriers. Although encapsulation technology has met several challenges, the convergence of expertise in materials, nanotechnology, stem cell biology and immunology is allowing us to get closer to the goal of encapsulated islet cell therapy for humans...
December 23, 2016: Nature Reviews. Drug Discovery
https://www.readbyqxmd.com/read/27990829/-islet-transplantation-as-a-treatment-for-hypoglycemia-unawareness-syndrome-evaluation-of-the-pilot-program-and-comparison-with-pancreas-transplantation
#18
Martina Zahradnická, Peter Girman, Jan Kříž, Zuzana Berková, Tomáš Koblas, Ema Vávrová, Lucie Kosinová, David Habart, Eva Fábryová, Eva Dovolilová, Tomáš Neškudla, Jan Peregrin, Jozef Kováč, Květoslav Lipár, Matěj Kočík, Lenka Németová, Jiří Svoboda, František Saudek
Islet transplantation (ITx) started in 2005 in IKEM as a potentially safer alternative to pancreas transplantation (PTx), which so far had represented the method of choice in type-1 diabetic patients with conservatively intractable hypoglycemia unawareness syndrome. The aim of the study was to compare these two methods with regard to severe hypoglycemia elimination and to frequency of complications.Up to November 2015 a total number of 48 patients underwent ITx. The results from 22 patients with hypoglycemia unawareness were statistically analyzed...
2016: Casopís Lékar̆ů C̆eských
https://www.readbyqxmd.com/read/27960025/-pancreas-and-islet-transplantation-clinical-indications-and-clinical-results
#19
Antonio Secchi
No abstract text is available yet for this article.
2016: Giornale Italiano di Nefrologia: Organo Ufficiale Della Società Italiana di Nefrologia
https://www.readbyqxmd.com/read/27931513/immunogenicity-of-anti-hla-antibodies-in-pancreas-and-islet-transplantation
#20
Benjamin Chaigne, Kirsten Geneugelijk, Benot Bdat, Mohamed Alibashe Ahmed, Gideon Hnger, Sophie de Seigneux, Sandrine Demuylder-Mischler, Thierry Berney, Eric Spierings, Sylvie Ferrari-Lacraz, Jean Villard
The aim of the current study was to characterize the anti-HLA antibodies before and after pancreatic islet or pancreas transplantation. We assessed the risk of anti-donor-specific antibody (DSA) sensitization in a single-center, retrospective clinical study at Geneva University Hospital. Data regarding clinical characteristics, graft outcome, HLA mismatch, donor HLA immunogenicity, and anti-HLA antibody characteristics were collected. Between January 2008 and July 2014, 18 patients received islet transplants, and 26 patients received a pancreas transplant...
November 2016: Cell Transplantation
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