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Islet transplantation

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https://www.readbyqxmd.com/read/29778021/the-homing-of-human-umbilical-cord-derived-mesenchymal-stem-cells-and-the-subsequent-modulation-of-macrophage-polarization-in-type-2-diabetic-mice
#1
Yaqi Yin, Haojie Hao, Yu Cheng, Jieqing Gao, Jiejie Liu, Zongyan Xie, Qi Zhang, Li Zang, Weidong Han, Yiming Mu
Umbilical cord-derived mesenchymal stem cells (UC-MSCs), with both immunomodulatory and pro-regenerative properties, are promising for the treatment of type 2 diabetes mellitus (T2DM). As efficient cell therapy largely relies on appropriate homing to target tissues, knowing where and to what extent injected UC-MSCs have homed is critically important. However, bio-distribution data for UC-MSCs in T2DM subjects are extremely limited. Beneficial effects of UC-MSCs on T2DM subjects are associated with increased M2 macrophages, but no systemic evaluation of M2 macrophages has been performed in T2DM individuals...
May 15, 2018: International Immunopharmacology
https://www.readbyqxmd.com/read/29777589/low-adhesive-ethylene-vinyl-alcohol-based-packaging-to-xenogeneic-islets-encapsulation-for-type-1-diabetes-treatment
#2
Kai-Chiang Yang, Goichi Yanai, Sin-Yu Yang, Priyadarshini Canning, Yoshio Satou, Masako Kawagoe, Shoichiro Sumi
Transplantation of encapsulated porcine islets is proposed to treat type 1 diabetes. However, envelopment of fibrous tissue and infiltration of immune cells impair islets function and eventually cause implant failure. It is known that hemodialysis using an ethylene vinyl alcohol (EVOH) membrane results in minor tissue responses. Therefore, we hypothesized that using a low adhesive EVOH membrane for encapsulation may prevent host cell accumulation and fibrous capsule formation. In this study, rat islets suspended in chitosan gel were encapsulated in bags made from highly porous EVOH membranes, and their in vitro insulin secretion function as well as in vivo performance were evaluated...
May 19, 2018: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/29776896/islet-transplantation-in-type-1-diabetes-moving-forward
#3
Shareen Forbes, Peter A Senior, A M James Shapiro
No abstract text is available yet for this article.
May 15, 2018: Lancet Diabetes & Endocrinology
https://www.readbyqxmd.com/read/29776895/islet-transplantation-versus-insulin-therapy-in-patients-with-type-1-diabetes-with-severe-hypoglycaemia-or-poorly-controlled-glycaemia-after-kidney-transplantation-trimeco-a-multicentre-randomised-controlled-trial
#4
Sandrine Lablanche, Marie-Christine Vantyghem, Laurence Kessler, Anne Wojtusciszyn, Sophie Borot, Charles Thivolet, Sophie Girerd, Domenico Bosco, Jean-Luc Bosson, Cyrille Colin, Rachel Tetaz, Sophie Logerot, Julie Kerr-Conte, Eric Renard, Alfred Penfornis, Emmanuel Morelon, Fanny Buron, Kristina Skaare, Gwen Grguric, Coralie Camillo-Brault, Harald Egelhofer, Kanza Benomar, Lionel Badet, Thierry Berney, François Pattou, Pierre-Yves Benhamou
BACKGROUND: Islet transplantation is indicated for patients with type 1 diabetes with severe hypoglycaemia or after kidney transplantation. We did a randomised trial to assess the efficacy and safety of islet transplantation compared with insulin therapy in these patients. METHODS: In this multicentre, open-label, randomised controlled trial, we randomly assigned (1:1) patients with type 1 diabetes at 15 university hospitals to receive immediate islet transplantation or intensive insulin therapy (followed by delayed islet transplantation)...
May 15, 2018: Lancet Diabetes & Endocrinology
https://www.readbyqxmd.com/read/29775636/epithelial-proliferation-in-inflammatory-skin-disease-is-regulated-by-ttc7-in-fibroblasts-and-lymphocytes
#5
Ursina Nüesch, Andrea A Mauracher, Lennart Opitz, Benjamin Volkmer, Katarzyna Michalak-Mićka, Jivko Kamarachev, Tom Hartwig, Ernst Reichmann, Burkhard Becher, Stefano Vavassori, Jana Pachlopnik Schmid
BACKGROUND: Mutations in tetratricopeptide repeat domain 7A (TTC7A) and its mouse orthologue Ttc7 result in a multisystemic disease, mostly affecting epithelial barriers and the immune system. Despite successful hematopoietic stem cell transplantation, ongoing progression of gastrointestinal manifestations can be life-threatening in TTC7A-deficient patients. OBJECTIVE: To identify whether TTC7A mutations dysregulate epithelial cells only, or whether a cell-intrinsic defect in lymphocytes or other cells contributes to disease manifestations...
May 15, 2018: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/29771178/islet-microvasculature-alterations-with-loss-of-beta-cells-in-patients-with-type-1-diabetes
#6
Joseph S Canzano, Lith H Nasif, Elizabeth A Butterworth, Dongtao A Fu, Mark A Atkinson, Martha Campbell-Thompson
Islet microvasculature provides key architectural and functional roles, yet the morphological features of islets from patients with type 1 diabetes are poorly defined. We examined islet and exocrine microvasculature networks by multiplex immunofluorescence imaging of pancreases from organ donors with and without type 1 diabetes ( n=17 and n=16, respectively) and determined vessel diameter, density, and area. We also analyzed these variables in insulin-positive and insulin-negative islets of 7 type 1 diabetes donors...
May 1, 2018: Journal of Histochemistry and Cytochemistry: Official Journal of the Histochemistry Society
https://www.readbyqxmd.com/read/29770308/allo-and-auto-percutaneous-intra-portal-pancreatic-islet-transplantation-pipit-for-diabetes-cure-and-prevention-the-role-of-imaging-and-interventional-radiology
#7
REVIEW
Massimo Venturini, Claudio Sallemi, Paolo Marra, Anna Palmisano, Giulia Agostini, Carolina Lanza, Gianpaolo Balzano, Massimo Falconi, Antonio Secchi, Paolo Fiorina, Lorenzo Piemonti, Paola Maffi, Antonio Esposito, Francesco De Cobelli, Alessandro Del Maschio
Although the life expectancy of patients with type 1 diabetes mellitus (T1DM) has improved since the introduction of insulin therapy, the acute life-threatening and long-term complications from diabetes mellitus are significant causes of both mortality and morbidity. Percutaneous intra-portal pancreatic islet transplantation (PIPIT) is a minimally invasive, repeatable procedure which allows a β-cell replacement therapy through a liver islet engraftment, leading to insulin release and glycaemic control restoration in patients with diabetes...
April 2018: Gland Surgery
https://www.readbyqxmd.com/read/29769672/pancreas-regeneration
#8
REVIEW
Qiao Zhou, Douglas A Melton
The pancreas is made from two distinct components: the exocrine pancreas, a reservoir of digestive enzymes, and the endocrine islets, the source of the vital metabolic hormone insulin. Human islets possess limited regenerative ability; loss of islet β-cells in diseases such as type 1 diabetes requires therapeutic intervention. The leading strategy for restoration of β-cell mass is through the generation and transplantation of new β-cells derived from human pluripotent stem cells. Other approaches include stimulating endogenous β-cell proliferation, reprogramming non-β-cells to β-like cells, and harvesting islets from genetically engineered animals...
May 2018: Nature
https://www.readbyqxmd.com/read/29757902/differential-impact-of-t-bet-and-ifn%C3%AE-on-pancreatic-islet-allograft-rejection
#9
Alix Besançon, Zeynep Demir, Tania Goncalves, Fabrice Valette, Emilie Panafieu, Lucienne Chatenoud, Sylvaine You
BACKGROUND: T-cell-mediated graft rejection is mostly correlated with potent Th1 responses. However, since IFNγ mice reject their graft as efficiently as wild-type (WT) mice, the exact contribution of IFNγ and its transcription factor T-bet remains a matter of debate. Here, we address this question in the context of pancreatic islet allograft to better inform the molecular pathways that hampers islet survival in vivo. METHODS: Pancreatic islets from BALB/c mice were transplanted in WT, IFNγ or T-bet C57BL/6 mice...
May 2, 2018: Transplantation
https://www.readbyqxmd.com/read/29757700/adhesion-characteristics-of-porcine-pancreatic-islets-and-exocrine-tissue-to-coating-materials
#10
Yoshiki Nakashima, Chika Miyagi-Shiohira, Naoya Kobayashi, Issei Saitoh, Masami Watanabe, Hirofumi Noguchi
Since the report of the Edmonton protocol in 2000, islet transplantation has been implemented worldwide, and xenotransplantation using porcine islets has also been reported. In addition, many basic experiments using pancreatic islets and exocrine tissue after isolation have been reported. Recently, exocrine cells have been found to be essential for inducing the differentiation of pancreatic islets. Therefore, the importance of the culture conditions for pancreatic tissue when conducting experiments using pancreatic tissue is also increasing...
May 14, 2018: Islets
https://www.readbyqxmd.com/read/29756517/local-controlled-release-in-vivo-of-vascular-endothelial-growth-factor-within-a-subcutaneous-scaffolded-islet-implant-reduces-early-islet-necrosis-and-improves-performance-of-the-graft
#11
John A Gebe, Anton Preisinger, Michel D Gooden, Leonard A D'Amico, Robert B Vernon
Islet transplantation remains the only alternative to daily insulin therapy for control of type 1 diabetes (T1D) in humans. To avoid the drawbacks of intrahepatic islet transplantation, we are developing a scaffolded islet implant to transplant islets into nonhepatic sites. The implant test bed, sized for mice, consists of a limited (2-mm) thickness, large-pore polymeric sponge scaffold perforated with peripheral cavities that contain islets suspended in a collagen hydrogel. A central cavity in the scaffold holds a 2-mm diameter alginate sphere for controlled release of the angiogenic cytokine vascular endothelial growth factor ( VEGF)...
January 1, 2018: Cell Transplantation
https://www.readbyqxmd.com/read/29756009/molecular-architecture-of-mouse-and-human-pancreatic-zymogen-granules-protein-components-and-their-copy-numbers
#12
Jin-Sook Lee, Joseph A Caruso, Garrett Hubbs, Patricia Schnepp, James Woods, Jingye Fang, Chunying Li, Kezhong Zhang, Paul M Stemmer, Bhanu P Jena, Xuequn Chen
A molecular model of pancreatic zymogen granule (ZG) is critical for understanding its functions. We have extensively characterized the composition and membrane topology of rat ZG proteins. In this study, we report the development of targeted proteomics approaches to quantify representative mouse and human ZG proteins using LC-SRM and heavy isotope-labeled synthetic peptides. The absolute quantities of mouse Rab3D and VAMP8 were determined as 1242 ± 218 and 2039 ± 151 (mean ± SEM) copies per ZG...
2018: Biophysics Reports
https://www.readbyqxmd.com/read/29755519/simulated-cholinergic-reinnervation-of-%C3%AE-ins-1-cells-antidiabetic-utility-of-heterotypic-pseudoislets-containing-%C3%AE-cell-and-cholinergic-cell
#13
Ao Jiao, Feng Li, Chengshuo Zhang, Wu Lv, Baomin Chen, Jialin Zhang
Cholinergic neurons can functionally support pancreatic islets in controlling blood sugar levels. However, in islet transplantation, the level of cholinergic reinnervation is significantly lower compared to orthotopic pancreatic islets. This abnormal reinnervation affects the survival and function of islet grafts. In this study, the cholinergic reinnervation of beta cells was simulated by 2D and 3D coculture of INS-1 and NG108-15 cells. In 2D culture conditions, 20 mM glucose induced a 1.24-fold increase ( p < 0...
2018: International Journal of Endocrinology
https://www.readbyqxmd.com/read/29749717/using-mesenchymal-stromal-cells-in-islet-transplantation
#14
EDITORIAL
Ahmed A Arzouni, Andreia Vargas-Seymour, Nance Nardi, Aileen J F King, Peter M Jones
Islet transplantation has the potential to cure Type 1 diabetes but current clinical transplantation protocols are inefficient because of the extensive loss of functional islets during the immediate post-transplantation period. Studies in rodent models have demonstrated that co-transplanting mesencyhmal stromal cells (MSCs) with islets improves graft functional survival and transplantation outcomes, and some of the beneficial effects of MSCs are attributable to bioactive molecules secreted by MSCs. Clinical islet transplantation is almost exclusively via the hepatic portal vein, which does not facilitate co-engraftment of islets and MSCs so attention is currently focused on using cell-free cocktails of MSC-derived products to treat islets prior to transplantation...
May 11, 2018: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/29742420/self-condensation-culture-enables-vascularization-of-tissue-fragments-for-efficient-therapeutic-transplantation
#15
Yoshinobu Takahashi, Keisuke Sekine, Tatsuya Kin, Takanori Takebe, Hideki Taniguchi
Clinical transplantation of tissue fragments, including islets, faces a critical challenge because of a lack of effective strategies that ensure efficient engraftment through the timely integration of vascular networks. We recently developed a complex organoid engineering method by "self-condensation" culture based on mesenchymal cell-dependent contraction, thereby enabling dissociated heterotypic lineages including endothelial cells to self-organize in a spatiotemporal manner. Here, we report the successful adaptation of this method for generating complex tissues from diverse tissue fragments derived from various organs, including pancreatic islets...
May 8, 2018: Cell Reports
https://www.readbyqxmd.com/read/29740442/stability-of-chimerism-in-non-obese-diabetic-mice-achieved-by-rapid-t-cell-depletion-is-associated-with-high-levels-of-donor-cells-very-early-after-transplant
#16
Jiaxin Lin, William F N Chan, Louis Boon, Colin C Anderson
Stable mixed hematopoietic chimerism is a robust method for inducing donor-specific tolerance with the potential to prevent rejection of donor islets in recipients with autoimmune type-1 diabetes. However, with reduced intensity conditioning, fully allogeneic chimerism in a tolerance resistant autoimmune-prone non-obese diabetic (NOD) recipient has rarely been successful. In this setting, successful multilineage chimerism has required either partial major histocompatability complex matching, mega doses of bone marrow, or conditioning approaches that are not currently clinically feasible...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29740396/redox-dependent-inflammation-in-islet-transplantation-rejection
#17
REVIEW
Jessie M Barra, Hubert M Tse
Type 1 diabetes is an autoimmune disease that results in the progressive destruction of insulin-producing pancreatic β-cells inside the islets of Langerhans. The loss of this vital population leaves patients with a lifelong dependency on exogenous insulin and puts them at risk for life-threatening complications. One method being investigated to help restore insulin independence in these patients is islet cell transplantation. However, challenges associated with transplant rejection and islet viability have prevented long-term β-cell function...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29737242/bms-493-modulates-retinoic-acid-induced-differentiation-during-expansion-of-human-hematopoietic-progenitor-cells-for-islet-regeneration
#18
Ruth Marise Elgamal, Gillian I Bell, Sarah Krause, David A Hess
Cellular therapies are emerging as a novel treatment strategy for diabetes. Thus, the induction of endogenous islet regeneration in situ represents a feasible goal for diabetes therapy. Umbilical cord blood (UCB)-derived hematopoietic progenitor cells (HPC) isolated by high aldehyde dehydrogenase activity (ALDH<sup>hi</sup>) have previously been shown to reduce hyperglycemia after intrapancreatic (iPan) transplantation into streptozotocin (STZ)-treated non-obese diabetic (NOD) severe combined immunodeficient (SCID) mice...
May 8, 2018: Stem Cells and Development
https://www.readbyqxmd.com/read/29735923/the-spleen-as-an-optimal-site-for-islet-transplantation-and-a-source-of-mesenchymal-stem-cells
#19
REVIEW
Naoaki Sakata, Gumpei Yoshimatsu, Shohta Kodama
This review demonstrates the unique potential of the spleen as an optimal site for islet transplantation and as a source of mesenchymal stem cells. Islet transplantation is a cellular replacement therapy used to treat severe diabetes mellitus; however, its clinical outcome is currently unsatisfactory. Selection of the most appropriate transplantation site is a major factor affecting the clinical success of this therapy. The spleen has long been studied as a candidate site for islet transplantation. Its advantages include physiological insulin drainage and regulation of immunity, and it has recently also been shown to contribute to the regeneration of transplanted islets...
May 7, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29725602/study-on-association-of-pentraxin-3-and-diabetic-nephropathy-in-a-rat-model
#20
Xuehai Chen, Jiao Luo, Minmin Wu, Zhuo Pan, Yue Xie, Hongwei Wang, Bicheng Chen, Hong Zhu
Diabetic nephropathy (DN) is a serious microvascular complication of diabetes. Compared with other therapies for diabetic patients, islet transplantation can effectively prevent and reverse diabetes-induced microvascular disease, such as diabetic retinopathy and nephropathy. PTX3 is the only long pentraxin that can be detected in renal tissue. In this study, we investigated the expression of PTX3 when early DN was reversed after islet transplantation. Methods . Diabetes was induced in rats by injecting streptozotocin (STZ)...
2018: Journal of Diabetes Research
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