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Pancreatic islet

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https://www.readbyqxmd.com/read/28926842/pharmacotherapy-with-thymoquinone-improved-pancreatic-%C3%AE-cell-integrity-and-functional-activity-enhanced-islets-revascularization-and-alleviated-metabolic-and-hepato-renal-disturbances-in-streptozotocin-induced-diabetes-in-rats
#1
Adel Galal El-Shemi, Osama Adnan Kensara, Aiman Alsaegh, Mohammed Hasan Mukhtar
AIMS: This study is aimed at evaluating the antidiabetic effects of thymoquinone (TQ) on streptozotocin (STZ)-induced diabetes in rats, and exploring the possible underlying mechanisms. METHODS: Diabetes was induced in adult male Wistar rats by intraperitoneal injection of freshly prepared STZ (65 mg/kg). After disease induction, 42 rats were equally assigned to: controls, STZ-diabetic group, and STZ-diabetic group treated with oral TQ (35 mg/kg/day) for 5 weeks...
September 20, 2017: Pharmacology
https://www.readbyqxmd.com/read/28924486/expression-of-transcription-factors-in-men1-associated-pancreatic-neuroendocrine-tumors
#2
Yasutaka Takeda, Yukihiro Fujita, Kentaro Sakai, Tomoe Abe, Tomonobu Nakamura, Tsuyoshi Yanagimachi, Hidemitsu Sakagami, Jun Honjo, Atsuko Abiko, Yuichi Makino, Masakazu Haneda
MEN1-associated pancreatic neuroendocrine tumors (pNETs) may potentially express distinct hormones, but the mechanism has not been elucidated. Transcription factors such as MafA and Pdx1 have been identified to lead to beta cell differentiation, while Arx and Brn4 to alpha cell differentiation in developing pancreas. We hypothesized those transcription factors are important to produce specific hormones in pNETs, similarly to developing pancreas, and examined the expression of transcription factors in a case of MEN1 who showed immunohistological coexistence of several hormone-producing pNETs including insulinoma...
2017: Endocrinology, Diabetes & Metabolism Case Reports
https://www.readbyqxmd.com/read/28922976/transient-impairment-of-islet-architectural-development-in-pancreas-specific-bmpr1a-deleted-prenatal-mice-involves-reduced-expression-of-e-cadherin
#3
Fang-Xu Jiang, Leonard Charles Harrison
Bone morphogenetic protein (BMP) signaling plays critical roles on the development of a large array of embryonic organs and promotes the in vitro formation of pancreatic cystoid colonies containing insulin-producing cells. However, this signaling and its underlying mechanism on in vivo development of prenatal pancreas have not been clearly understood. To address these questions, we analyzed with a variety of techniques the prenatal mouse pancreas after Pdx1 (the pancreas and duodenal homeobox factor 1 gene)-driving deletion of the BMP receptor type 1a gene (Bmpr1a)...
September 19, 2017: Stem Cells and Development
https://www.readbyqxmd.com/read/28920919/age-dependent-human-%C3%AE-cell-proliferation-induced-by-glucagon-like-peptide-1-and-calcineurin-signaling
#4
Chunhua Dai, Yan Hang, Alena Shostak, Greg Poffenberger, Nathaniel Hart, Nripesh Prasad, Neil Phillips, Shawn E Levy, Dale L Greiner, Leonard D Shultz, Rita Bottino, Seung K Kim, Alvin C Powers
Inadequate pancreatic β cell function underlies type 1 and type 2 diabetes mellitus. Strategies to expand functional cells have focused on discovering and controlling mechanisms that limit the proliferation of human β cells. Here, we developed an engraftment strategy to examine age-associated human islet cell replication competence and reveal mechanisms underlying age-dependent decline of β cell proliferation in human islets. We found that exendin-4 (Ex-4), an agonist of the glucagon-like peptide 1 receptor (GLP-1R), stimulates human β cell proliferation in juvenile but not adult islets...
September 18, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28919426/improving-glycemic-control-in-model-mice-with-type-2-diabetes-by-increasing-superoxide-dismutase-sod-activity-using-silk-fibroin-hydrolysate-sfh
#5
Harry Jung, Yoo Yeon Kim, Boyoung Kim, Hajin Nam, Jun Gyo Suh
Islet cell dysfunction in type 2 diabetes is primarily attributed to the increased apoptosis of pancreatic beta cells. Silk fibroin hydrolysate (SFH) has an effect on blood in type 2 diabetes model mice (C57BL/KsJ-db/db). However, its exact mechanism is unknown. The type 2 diabetes model mice were randomly divided into non-diabetic mice (ND), diabetic mice (DB), and diabetic mice treated with silk fibroin hydrolysate (DB-SFH). The results showed that SFH significantly decreased fasting blood glucose and hemoglobin A1c (HbA1c)...
September 15, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28919263/single-cell-gene-expression-analysis-of-a-human-esc-model-of-pancreatic-endocrine-development-reveals-different-paths-to-%C3%AE-cell-differentiation
#6
Maja Borup Kjær Petersen, Ajuna Azad, Camilla Ingvorsen, Katja Hess, Mattias Hansson, Anne Grapin-Botton, Christian Honoré
The production of insulin-producing β cells from human embryonic stem cells (hESCs) in vitro represents a promising strategy for a cell-based therapy for type 1 diabetes mellitus. To explore the cellular heterogeneity and temporal progression of endocrine progenitors and their progeny, we performed single-cell qPCR on more than 500 cells across several stages of in vitro differentiation of hESCs and compared them with human islets. We reveal distinct subpopulations along the endocrine differentiation path and an early lineage bifurcation toward either polyhormonal cells or β-like cells...
September 8, 2017: Stem Cell Reports
https://www.readbyqxmd.com/read/28918929/vitamin-d-receptor-targeted-treatment-to-prevent-pathological-dedifferentiation-of-pancreatic-%C3%AE-cells-under-hyperglycaemic-stress
#7
A Neelankal John, Z Iqbal, S Colley, G Morahan, M Makishima, F-X Jiang
Dedifferentiation has been identified as one of the causes of β-cell failure resulting in type 2 diabetes (T2D). This study tested whether increasing vitamin D receptor (VDR) expression prevents dedifferentiation of β cells in a high-glucose state in vitro. Culturing a mouse insulinoma cell line (MIN6) in a high-glucose environment decreased VDR expression. However, increased VDR following vitamin D3 (VD3) treatment improved insulin release of early-passage MIN6 and insulin index of db/- (heterozygous) islets to levels seen in normal functional islets...
September 11, 2017: Diabetes & Metabolism
https://www.readbyqxmd.com/read/28918509/effects-of-tetramethylpyrazine-phosphate-on-pancreatic-islet-microcirculation-in-sd-rats
#8
X Xu, L Wu, Z Q Lu, P Xia, X P Zhu, X Gao
PURPOSES: Abnormal islet microcirculation impetus the insulin production and accelerates progression of Type 1 and 2 diabetes. In this study, we investigated whether tetramethylpyrazine phosphate (TMPP), a vasoactive substance, could regulate the islet microcirculation and insulin concentration and improve glycaemia in SD rats. METHODS: SD rats were randomly divided into two groups, the control and TMPP groups. Each group was further divided into three subgroups according to the intravenous injection of either saline, 15 or 30% glucose...
September 16, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/28916910/encompassing-atp-dna-insulin-and-protein-content-for-quantification-and-assessment-of-human-pancreatic-islets
#9
Meirigeng Qi, Shiela Bilbao, Elena Forouhar, Fouad Kandeel, Ismail H Al-Abdullah
Islet transplantation has made major progress to treat patients with type 1 diabetes. Islet mass and quality are critically important to ensure successful transplantation. Currently, islet status is evaluated using insulin secretion, oxygen consumption rate, or adenosine triphosphate (ATP) measurement. These parameters are evaluated independently and do not effectively predict islet status post-transplant. Therefore, assessing human pancreatic islets by encompassing ATP, DNA, insulin, and protein content from a single tissue sample would serve as a better predictor for islet status...
September 15, 2017: Cell and Tissue Banking
https://www.readbyqxmd.com/read/28915137/xenoislets-porcine-pancreatic-islets-for-the-treatment-of-type-i-diabetes
#10
Nizar I Mourad, Pierre Rene Gianello
PURPOSE OF REVIEW: Porcine islets are being extensively investigated as alternative sources of insulin-secreting cells for transplantation in insulin-dependent diabetic patients. The present review focuses on recent advances in porcine islet transplantation with particular emphasis on new transgenic pig models, islet encapsulation, and biosafety considerations. RECENT FINDINGS: Genetic modifications aimed to reduce islet cell immunogenicity, to prolong their survival, and to improve their secretory function have been reported...
September 14, 2017: Current Opinion in Organ Transplantation
https://www.readbyqxmd.com/read/28911248/single-synchronous-delivery-of-fk506-loaded-polymeric-microspheres-with-pancreatic-islets-for-the-successful-treatment-of-streptozocin-induced-diabetes-in-mice
#11
Shiva Pathak, Shobha Regmi, Biki Gupta, Bijay K Poudel, Tung Thanh Pham, Chul Soon Yong, Jong Oh Kim, Jae-Ryong Kim, Min Hui Park, Young Kyung Bae, Simmyung Yook, Cheol-Hee Ahn, Jee-Heon Jeong
Immune rejection after transplantation is common, which leads to prompt failure of the graft. Therefore, to prolong the survival time of the graft, immunosuppressive therapy is the norm. Here, we report a robust immune protection protocol using FK506-loaded microspheres (FK506M) in injectable hydrogel. Pancreatic islets were codelivered with the FK506M into the subcutaneous space of streptozocin-induced diabetic mice. The islets codelivered with 10 mg/kg FK506M maintained normal blood glucose levels during the study period (survival rate: 60%)...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/28911206/identification-of-the-molecular-dysfunction-caused-by-glutamate-dehydrogenase-s445l-mutation-responsible-for-hyperinsulinism-hyperammonemia
#12
Mariagrazia Grimaldi, Melis Karaca, Livia Latini, Estelle Brioudes, Thomas Schalch, Pierre Maechler
Congenital hyperinsulinism/hyperammonemia (HI/HA) syndrome gives rise to unregulated protein-induced insulin secretion from pancreatic beta-cells, fasting hypoglycemia and elevated plasma ammonia levels. Mutations associated with HI/HA were identified in the Glud1 gene, encoding for glutamate dehydrogenase (GDH). We aimed at identifying the molecular causes of dysregulation in insulin secretion and ammonia production conferred by the most frequent HI/HA mutation Ser445Leu. Following transduction with adenoviruses carrying the human GDH-wild type or GDH-S445L-mutant gene, immunoblotting showed efficient expression of the transgenes in all the investigated cell types...
September 15, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28911142/deficient-endogenous-glucose-production-during-exercise-after-total-pancreatectomy-islet-autotransplantation
#13
Lindsey D Bogachus, Elizabeth Oseid, Melena Bellin, Adrian Vella, R Paul Robertson
Context: Total pancreatectomy followed by intrahepatic islet autotransplantation (TP/IAT) is performed to alleviate severe, unrelenting abdominal pain caused by chronic pancreatitis, to improve quality of life, and to prevent diabetes. Objective: To determine the cause of exercise-induced hypoglycemia that is a common complaint in TP/IAT recipients. Design: Participants completed 1 hour of steady-state exercise. Setting: Hospital research unit...
September 1, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28904022/pi3k%C3%AE-ablation-does-not-promote-diabetes-in-db-db-mice-but-improves-insulin-sensitivity-and-reduces-pancreatic-%C3%AE-cell-apoptosis
#14
Ludovic Breasson, Claudia Sardi, Barbara Becattini, Fabio Zani, Giovanni Solinas
PI3Kγ has emerged as a promising target for the treatment of obesity and insulin resistance; however, previous studies have indicated that PI3Kγ activity in pancreatic β-cells is required for normal insulin secretion in response to glucose. Hence, a possible deterioration of insulin secretion capacity in patients who are predisposed to the failure of pancreatic β-cell function is a major concern for the pharmacologic inhibition of PI3Kγ. To address this issue, we investigated the effects of PI3Kγ ablation in db/db diabetic mice, a genetic model of obesity-driven β-cell failure and diabetes...
September 13, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28903914/long-term-treatment-with-the-ghrelin-receptor-antagonist-d-lys3-ghrp-6-does-not-improve-glucose-homeostasis-in-non-obese-diabetic-mkr-mice
#15
Rasha Mosa, Lili Huang, Hongzhuo Li, Michael Grist, Derek LeRoith, Chen Chen
Ghrelin secretion has been associated with increased caloric intake and adiposity. The expressions of ghrelin and its receptor (GHS-R1a) in pancreas have raised the interest about the role of ghrelin in glucose homeostasis. Most of the studies showed that ghrelin promoted hyperglycaemia and inhibited insulin secretion. This raised the interest in using GHS-R1a antagonists as therapeutic targets for type 2 diabetes. Available data of GHS-R antagonists are on a short-term basis. Moreover, the complexity of GHS-R1a signalling makes it difficult to understand the mechanism of action of GHS-R1a antagonists...
September 13, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28902801/the-characteristics-of-aborted-procedures-in-total-pancreatectomy-with-islet-autotransplantation-for-chronic-pancreatitis
#16
Rauf Shahbazov, Gumpei Yoshimatsu, Ali Dabous, Michael C Lawrence, Peter T Kim, Nicholas Onaca, Ernest Beecherl, Bashoo Naziruddin, Marlon F Levy
No abstract text is available yet for this article.
October 2017: Pancreas
https://www.readbyqxmd.com/read/28902069/antiinflammatory-strategies-in-intrahepatic-islet-transplantation-a-comparative-study-in-preclinical-models
#17
A Citro, E Cantarelli, S Pellegrini, E Dugnani, L Piemonti
BACKGROUND: The identification of pathway(s) playing a pivotal role in peritransplant detrimental inflammatory events represents the crucial step towards a better management and outcome of pancreatic islet transplanted patients. Recently, we candidate the CXCR1/2 inhibition as a relevant strategy in enhancing pancreatic islet survival after transplantation. METHODS: Here, the most clinically used antiinflammatory compounds (IL1-receptor antagonist, steroids and TNF-α inhibitor) alone or in combination with a CXCR1/2 inhibitor were evaluated in their ability to improve engraftment or delay graft rejection...
September 8, 2017: Transplantation
https://www.readbyqxmd.com/read/28901416/protective-role-of-berberine-and-coptischinensis-extract-on-t2md-rats-and-associated-islet-rin%C3%A2-5f-cells
#18
Yu-Yu Jiang, Han-Ming Cui, Jia-Long Wang, Hui Liu, Meng-Meng Dang, Qiu-Yan Zhang, Fang Yang, Jian-Tao Kou, Xiao-Lin Tong
The aim of the present study was to compare the different effects of berberine (Ber) and Coptischinensis extract (CCE) on a rat model of type 2 diabetes mellitus (T2DM), and the islet Rin‑5f cell line was used to examine the differences between Ber and CCE and the underlying mechanisms. CCE was extracted and purified prior to analysis. Male Sprague‑Dawley rats were provided with a high‑fat diet to induce insulin resistance prior to injecting with streptozotocinto establish the T2DM model, the T2DM rats were treated with Ber and CCE, and blood samples and pancreatic tissues were obtained and compared to examine T2DM metabolic syndromes among the groups of rats, which included healthy rats, model rats, and model rats treated with Ber and CCE at different doses between 0 and 8 weeks...
September 12, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28901184/ex-vivo-pretreatment-of-islets-with-mitomycin-c-reduction-in-immunogenic-potential-of-islets-by-suppressing-secretion-of-multiple-chemotactic-factors
#19
Naoya Sato, Junichiro Haga, Takayuki Anazawa, Akira Kenjo, Takashi Kimura, Ikuo Wada, Tsutomu Mori, Shigeru Marubashi, Mitsukazu Gotoh
Strategies to reduce the immunogenicity of pancreatic islets and to prevent the activation of proinflammatory events are essential for successful islet engraftment. Pretransplant islet culture presents an opportunity for preconditioning to improve outcomes of islet transplantation. We previously demonstrated that ex vivo mitomycin C (MMC) pretreatment and subsequent culture significantly prolonged graft survival. Fully understanding the biological process of pretreatment could result in the development of a protocol to improve the survival of islet grafts...
August 2017: Cell Transplantation
https://www.readbyqxmd.com/read/28895017/total-pancreatectomy-with-islet-autotransplantation-for-acute-recurrent-and-chronic-pancreatitis
#20
REVIEW
Varvara A Kirchner, Ty B Dunn, Gregory J Beilman, Srinath Chinnakotla, Timothy L Pruett, Joshua J Wilhelm, Sarah J Schwarzenberg, Martin L Freeman, Melena D Bellin
PURPOSE OF REVIEW: The first total pancreatectomy and islet autotransplantation (TP-IAT) was performed for chronic pancreatitis in 1977 with the goal to ameliorate the pain and simultaneously preserve islet function. We reviewed the recent medical literature regarding indications, patient suitability, current outcomes, and challenges in TP-IAT. RECENT FINDINGS: Current indications for TP-IAT include intractable pain secondary to chronic pancreatitis (CP) or acute recurrent pancreatitis (ARP) with failed medical and endoscopic/surgical management...
September 11, 2017: Current Treatment Options in Gastroenterology
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