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islet isolation

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https://www.readbyqxmd.com/read/29676546/alginate-catechol-cross-linking-interferes-with-insulin-secretion-capacity-in-isolated-murine-islet-cells
#1
Yu Sik Kim, Seung Woo Cho, Bomin Ko, Jisoo Shin, Chul Woo Ahn
Over the past three decades, human pancreatic islet isolation and transplantation techniques have developed as a routine clinical procedure for selected patients with type 1 diabetes mellitus. However, due to the donor shortage and required chronic systemic immunosuppression, the widespread application of islet transplantation is limited. To overcome these limitations, providing a physical barrier to transplanted islet cells with encapsulating biomaterial has emerged as a promising approach to enhance engraftment and promote islet survival post-transplantation...
April 2018: Diabetes & Metabolism Journal
https://www.readbyqxmd.com/read/29675353/magnetic-particle-imaging-of-islet-transplantation-in-the-liver-and-under-the-kidney-capsule-in-mouse-models
#2
Ping Wang, Patrick W Goodwill, Prachi Pandit, Jeff Gaudet, Alana Ross, Junfeng Wang, Elaine Yu, Daniel W Hensley, Timothy C Doyle, Christopher H Contag, Steven Conolly, Anna Moore
Background: Islet transplantation (Tx) represents the most promising therapy to restore normoglycemia in type 1 diabetes (T1D) patients to date. As significant islet loss has been observed after the procedure, there is an urgent need for developing strategies for monitoring transplanted islet grafts. In this report we describe for the first time the application of magnetic particle imaging (MPI) for monitoring transplanted islets in the liver and under the kidney capsule in experimental animals...
March 2018: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/29673130/effects-of-gip-on-regional-blood-flow-during-normoglycemia-and-hyperglycemia-in-anesthetized-rats
#3
Xiang Gao, Andreas Lindqvist, Monica Sandberg, Leif Groop, Nils Wierup, Leif Jansson
The incretin hormone glucose-dependent insulinotropic polypeptide (GIP) potentiates glucose-stimulated insulin secretion, and affects β-cell turnover. This study aimed at evaluating if some of the beneficial effects of GIP on glucose homeostasis can be explained by modulation of islet blood flow. Anesthetized Sprague-Dawley rats were infused intravenously with different doses of GIP (10, 20, or 60 ng/kg*min) for 30 min. Subsequent organ blood flow measurements were performed with microspheres. In separate animals, islets were perfused ex vivo with GIP (10-6 -10-12  mol/L) during normo- and hyperglycemia and arteriolar responsiveness was recorded...
April 2018: Physiological Reports
https://www.readbyqxmd.com/read/29671030/abnormal-islet-sphingolipid-metabolism-in-type-1-diabetes
#4
Laurits J Holm, Lars Krogvold, Jane P Hasselby, Simranjeet Kaur, Laura A Claessens, Mark A Russell, Clayton E Mathews, Kristian F Hanssen, Noel G Morgan, Bobby P C Koeleman, Bart O Roep, Ivan C Gerling, Flemming Pociot, Knut Dahl-Jørgensen, Karsten Buschard
AIMS/HYPOTHESIS: Sphingolipids play important roles in beta cell physiology, by regulating proinsulin folding and insulin secretion and in controlling apoptosis, as studied in animal models and cell cultures. Here we investigate whether sphingolipid metabolism may contribute to the pathogenesis of human type 1 diabetes and whether increasing the levels of the sphingolipid sulfatide would prevent models of diabetes in NOD mice. METHODS: We examined the amount and distribution of sulfatide in human pancreatic islets by immunohistochemistry, immunofluorescence and electron microscopy...
April 18, 2018: Diabetologia
https://www.readbyqxmd.com/read/29669939/cystic-fibrosis-related-diabetes-is-caused-by-islet-loss-and-inflammation
#5
Nathaniel J Hart, Radhika Aramandla, Gregory Poffenberger, Cody Fayolle, Ariel H Thames, Austin Bautista, Aliya F Spigelman, Jenny Aurielle B Babon, Megan E DeNicola, Prasanna K Dadi, William S Bush, Appakalai N Balamurugan, Marcela Brissova, Chunhua Dai, Nripesh Prasad, Rita Bottino, David A Jacobson, Mitchell L Drumm, Sally C Kent, Patrick E MacDonald, Alvin C Powers
Cystic fibrosis-related (CF-related) diabetes (CFRD) is an increasingly common and devastating comorbidity of CF, affecting approximately 35% of adults with CF. However, the underlying causes of CFRD are unclear. Here, we examined cystic fibrosis transmembrane conductance regulator (CFTR) islet expression and whether the CFTR participates in islet endocrine cell function using murine models of β cell CFTR deletion and normal and CF human pancreas and islets. Specific deletion of CFTR from murine β cells did not affect β cell function...
April 19, 2018: JCI Insight
https://www.readbyqxmd.com/read/29669745/gpr119-agonism-increases-glucagon-secretion-during-insulin-induced-hypoglycemia
#6
Nina Xiaoyan Li, Stacey Brown, Tim Kowalski, Margaret Wu, Liming Yang, Ge Dai, Aleksandr Petrov, Yuyan Ding, Tamara Dlugos, H Blair Woods, Liangsu Wang, Mark Erion, Robert Sherwin, David E Kelley
Insulin-induced hypoglycemia in diabetes is associated with impaired glucagon secretion. Here we tested whether stimulation of GPR119, a G-protein coupled receptor expressed in pancreatic islet as well as enteroendocrine cells, and previously shown to stimulate insulin and incretin secretion might enhance glucagon secretion during hypoglycemia. In the study, GPR119 agonists were applied to isolated islets or perfused pancreata perfusions to assess insulin and glucagon secretion during hypoglycemia or hyperglycemic conditions...
April 18, 2018: Diabetes
https://www.readbyqxmd.com/read/29662481/-listeria-monocytogenes-sequence-types-121-and-14-repeatedly-isolated-within-one-year-of-sampling-in-a-rabbit-meat-processing-plant-persistence-and-ecophysiology
#7
Frédérique Pasquali, Federica Palma, Laurent Guillier, Alex Lucchi, Alessandra De Cesare, Gerardo Manfreda
Listeria monocytogenes is a foodborne pathogen adapted to survive and persist in multiple environments. Following two previous studies on prevalence and virulence of L. monocytogenes ST121 and ST14 repeatedly collected in a the same rabbit-meat processing plant, the research questions of the present study were to: (1) assess persistence of L. monocytogenes isolates from the rabbit-plant; (2) select genes associated to physiological adaptation to the food-processing environment; (3) compare presence/absence/truncation of these genes in newly sequenced and publicly available ST121 and ST14 genomes...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29643912/association-of-rage-gene-polymorphism-with-type-2-diabetes-mellitus-in-local-population
#8
Saba Zulfiqar, Fatma Hussain, Amer Jamil, Nisar Ahmed
Objectives: Type-2 diabetes mellitus (T2DM) is an endocrine disease having a significant genetic component. Polymorphisms of many genes may affect hereditary vulnerability of the disease that is characterized by insulin resistance and islet disorder. As the genetic basis of T2DM can vary between ethnic groups, it is important to investigate the genetic link of T2DM in Pakistani populace. This study was aimed to assess the association of receptor for advanced glycation end product (RAGE) gene polymorphism (-429T>C) with Type-2 diabetes mellitus within local populace...
January 2018: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/29626110/impaired-endocrine-metabolic-homeostasis-underlying-mechanism-of-its-induction-by-unbalanced-diet
#9
Bárbara Maiztegui, Carolina Lisi Román, Juan José Gagliardino, Luis Emilio Flores
Aim : to characterize the intrinsic mechanism by which sucrose induces β-cell dysfunction. Methods : Normal rats received for 3 weeks a standard diet supplemented with 10% sucrose in the drinking water (HS) with/out an antioxidant agent (R/S α-lipoic acid). We measured plasma glucose, insulin, triglyceride, leptin and lipid peroxidation levels; homeostasis model assessment-insulin resistance (HOMA-IR) and HOMA-β indexes were also determined. Insulin secretion, β-cell apoptosis, intracellular insulin and leptin mediators, and oxidative stress (OS) markers were also measured in islets isolated from each experimental group...
April 6, 2018: Clinical Science (1979-)
https://www.readbyqxmd.com/read/29622345/early-islets-and-mesenchyme-from-an-injured-adult-pancreas-improve-syngeneic-engraftments-and-islet-graft-function-in-diabetic-rats
#10
Venant Tchokonte-Nana, Juziel Kampando Manda
A decrease in mass of isografts and a decline in islet function are major challenges in islet transplantations. Despite this, transplantation of 84 h harvested pancreatic duct ligation (PDL) tissues have been shown to have the same functional ability to foetal pancreata, but there was only 40% success in reverting hyperglycaemia. We tested the potential of early islets with mesenchymal stromal cells (MSCs) to promote isogeneic grafts survival and to restore normoglycemia in diabetic rats, in comparison with late islets...
April 2, 2018: Acta Histochemica
https://www.readbyqxmd.com/read/29621044/impact-of-oxygen-on-pancreatic-islet-survival
#11
Hirotake Komatsu, Fouad Kandeel, Yoko Mullen
Pancreatic islet transplantation is a promising treatment option for individuals with type 1 diabetes; however, maintaining islet function after transplantation remains a large challenge. Multiple factors, including hypoxia associated events, trigger pretransplant and posttransplant loss of islet function. In fact, islets are easily damaged in hypoxic conditions before transplantation including the preparation steps of pancreas procurement, islet isolation, and culture. Furthermore, after transplantation, islets are also exposed to the hypoxic environment of the transplant site until they are vascularized and engrafted...
April 4, 2018: Pancreas
https://www.readbyqxmd.com/read/29617347/flavonoid-8-o-glucuronides-from-the-aerial-parts-of-malva-verticillata-and-their-recovery-effects-on-alloxan-induced-pancreatic-islets-in-zebrafish
#12
Jung-Hwan Ko, Youn Hee Nam, Sun-Woo Joo, Hyoung-Geun Kim, Yeong-Geun Lee, Tong Ho Kang, Nam-In Baek
Malva verticillata (Cluster mallow), a leafy vegetable that has been popular in East Asia for a long time, has also been used in herbal teas and medicines. The aqueous fraction of the aerial parts of Malva verticillata, exhibiting a very high quantity of flavonoids compared to the EtOAc and n -BuOH fractions, exhibited significant recovery effects on pancreatic islets damaged by alloxan in zebrafish larvae. Thus, the bioactive components responsible for this anti-diabetic activity were investigated. A new flavonoid glucuronide (1) and five known flavonoids were isolated from the aqueous fraction...
April 4, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29605295/heparan-sulfate-in-pancreatic-%C3%AE-cells-contributes-to-normal-glucose-homeostasis-by-regulating-insulin-secretion
#13
Takuro Matsuzawa, Takeo Yoshikawa, Tomomitsu Iida, Anikó Kárpáti, Haruna Kitano, Ryuichi Harada, Tadaho Nakamura, Akira Sugawara, Yu Yamaguchi, Kazuhiko Yanai
Heparan sulfate (HS), a linear polysaccharide, is involved in diverse biological functions of various tissues. HS is expressed in pancreatic β-cells and may be involved in β-cell functions. However, the importance of HS for β-cell function remains unknown. Here, we generated mice with β-cell-specific deletion of Ext1 (βExt1CKO), which encodes an enzyme essential for HS synthesis, to investigate the detailed roles of HS in β-cell function. βExt1CKO mice decreased body weights compared with control mice, despite increased food intake...
March 29, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29603910/insulin-secretion-kinetics-from-single-islets-reveals-distinct-sub-populations
#14
Rajesh Guruswamy Damodaran, Alexandre Poussard, Benoît Côté, Parker L Andersen, Patrick Vermette
Type II diabetes progresses with inadequate insulin secretion and prolonged elevated circulating glucose levels. Also, pancreatic islets isolated for transplantation or tissue engineering can be exposed to glucose over extended timeframe. We hypothesized that isolated pancreatic islets can secrete insulin over a prolonged period of time when incubated in glucose solution and that not all islets release insulin in unison. Insulin secretion kinetics was examined and modeled from single mouse islets in response to chronic glucose exposure (2...
March 31, 2018: Biotechnology Progress
https://www.readbyqxmd.com/read/29603452/pancreas-preservation-fluid-microbial-contamination-is-associated-with-poor-islet-isolation-outcomes-a-multi-centre-cohort-study
#15
Raphael P H Meier, Diego O Andrey, Pamela Sun, Nadja Niclauss, Benoît Bédat, Sandrine Demuylder-Mischler, Sophie Borot, Pierre-Yves Benhamou, Anne Wojtusciszyn, Fanny Buron, Nadine Pernin, Yannick D Muller, Domenico Bosco, Christian van Delden, Thierry Berney
BACKGROUND: The microbiological safety of islet preparations is paramount. Preservation medium contamination is frequent and its impact on islet yield and function remains unclear. METHODS: Microbiological samples collected during islet isolations from 2006 to 2016 were analyzed and correlated to isolation and allo- and auto-transplantation outcomes. RESULTS: Microbial contamination of preservation medium was found in 64.4% of processed donor pancreases (291/452)...
March 30, 2018: Transplant International: Official Journal of the European Society for Organ Transplantation
https://www.readbyqxmd.com/read/29601863/culturing-functional-pancreatic-islets-on-%C3%AE-5-laminins-and-curative-transplantation-to-diabetic-mice
#16
Kristmundur Sigmundsson, Juha R M Ojala, Miina K Öhman, Anne-May Österholm, Aida Moreno-Moral, Anna Domogatskaya, Li Yen Chong, Yang Sun, Xiaoran Chai, Joseph A M Steele, Benjamin George, Manuel Patarroyo, Ann-Sofie Nilsson, Sergey Rodin, Sujoy Ghosh, Molly M Stevens, Enrico Petretto, Karl Tryggvason
The efficacy of islet transplantation for diabetes treatment suffers from lack of cadaver-derived islets, islet necrosis and long transfer times prior to transplantation. Here, we developed a method for culturing mouse and human islets in vitro on α5-laminins, which are natural components of islet basement membranes. Adhering islets spread to form layers of 1-3 cells in thickness and remained normoxic and functional for at least 7 days in culture. In contrast, spherical islets kept in suspension developed hypoxia and central necrosis within 16 h...
March 27, 2018: Matrix Biology: Journal of the International Society for Matrix Biology
https://www.readbyqxmd.com/read/29594255/enhanced-expression-of-the-key-mitosis-regulator-cyclin-b1-is-mediated-by-pdz-binding-kinase-in-islets-of-pregnant-mice
#17
Tadayoshi Uesato, Takeshi Ogihara, Akemi Hara, Hitoshi Iida, Takeshi Miyatsuka, Yoshio Fujitani, Satoru Takeda, Hirotaka Watada
The proliferation of pancreatic β cells is enhanced to enable an increase in β -cell mass and to compensate for insulin resistance during pregnancy. To elucidate the mechanisms involved, we previously investigated islets from pregnant and nonpregnant mice by gene expression profiling and found that the expression of postsynaptic density-95/Discs large/zonula occludens-1 (PDZ)-binding kinase (Pbk), a member of the mitogen-activated protein kinase kinase family, is increased in pregnant mouse islets compared with control mouse islets...
March 1, 2018: Journal of the Endocrine Society
https://www.readbyqxmd.com/read/29590649/circulating-lncrnas-analysis-in-patients-with-type-2-diabetes-reveals-novel-genes-influencing-glucose-metabolism-and-islet-%C3%AE-cell-function
#18
Yuting Ruan, Nie Lin, Qiang Ma, Rongping Chen, Zhen Zhang, Weiheng Wen, Hong Chen, Jia Sun
BACKGROUND/AIMS: The islet is an important endocrine organ to secrete insulin to regulate the metabolism of glucose and maintain the stability of blood glucose. Long noncoding RNAs (lncRNAs) are involved in a variety of biological functions and play key roles in many diseases, including type 2 diabetes (T2D). The aim of this study was to determine whether lncRNA-p3134 is associated with glucose metabolism and insulin signaling in pancreatic β cells. METHODS: LncRNA microarray technology was used to identify the differentially expressed circulating lncRNAs in T2D patients...
March 22, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29589072/the-resident-macrophages-in-murine-pancreatic-islets-are-constantly-probing-their-local-environment-capturing-beta-cell-granules-and-blood-particles
#19
Bernd H Zinselmeyer, Anthony N Vomund, Brian T Saunders, Michael W Johnson, Javier A Carrero, Emil R Unanue
AIMS/HYPOTHESIS: We studied here the interactions between the resident macrophages of pancreatic islets with beta cells and the blood vasculature. We also examined the immunological consequences of such interactions. METHODS: Islets were isolated from C57BL/6 mice expressing CX3C motif chemokine receptor 1-green fluorescent protein (CX3CR-GFP) and examined live by two-photon microscopy. Islets were also examined by electron microscopy to study the relationship of the intra-islet macrophages with the beta cells...
March 27, 2018: Diabetologia
https://www.readbyqxmd.com/read/29587369/an-scf-fbxo28-e3-ligase-protects-pancreatic-%C3%AE-cells-from-apoptosis
#20
Kanaka Durga Devi Gorrepati, Wei He, Blaz Lupse, Ting Yuan, Kathrin Maedler, Amin Ardestani
Loss of pancreatic β-cell function and/or mass is a central hallmark of all forms of diabetes but its molecular basis is incompletely understood. β-cell apoptosis contributes to the reduced β-cell mass in diabetes. Therefore, the identification of important signaling molecules that promote β-cell survival in diabetes could lead to a promising therapeutic intervention to block β-cell decline during development and progression of diabetes. In the present study, we identified F-box protein 28 (FBXO28), a substrate-recruiting component of the Skp1-Cul1-F-box (SCF) ligase complex, as a regulator of pancreatic β-cell survival...
March 24, 2018: International Journal of Molecular Sciences
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