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pancreatic beta cell

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https://www.readbyqxmd.com/read/29775598/selective-cytotoxicity-of-the-nampt-inhibitor-fk866-toward-gastric-cancer-cells-with-markers-of-the-epithelial-mesenchymal-transition-due-to-loss-of-naprt
#1
Jooyoung Lee, Hyosil Kim, Jae Eun Lee, Su-Jin Shin, Sejin Oh, Sungjin Kwon, Hakhyun Kim, Yoon Young Choi, Michael A White, Soonmyung Paik, Jae-Ho Cheong, Hyun Seok Kim
BACKGROUND & AIMS: Markers of the epithelial-mesenchymal transition (EMT) in gastric tumor tissues are associated with poor outcomes of patients. We performed a screen to identify pharmacologic compounds that kill gastric cancer cells with EMT-associated gene expression patterns and investigate their mechanisms. METHODS: We identified 29 gastric cancer cell lines with gene expression signature previously associated with an EMT subtype, based on data from RNA sequence analyses, and confirmed their mesenchymal phenotypes of 7 lines (Hs746T, SNU1750, MKN1, SK4, SNU484, SNU668, and YCC11), based in invasive activity and protein markers...
May 15, 2018: Gastroenterology
https://www.readbyqxmd.com/read/29772703/alpha-mangostin-improves-insulin-secretion-and-protects-ins-1-cells-from-streptozotocin-induced-damage
#2
Dahae Lee, Young-Mi Kim, Kiwon Jung, Young-Won Chin, Ki Sung Kang
Alpha (α)-mangostin, a yellow crystalline powder with a xanthone core structure, is isolated from mangosteen ( Garcinia mangostana ), which is a tropical fruit of great nutritional value. The aim of the present study was to investigate the anti-diabetic effects of α-mangostin and to elucidate the molecular mechanisms underlying its effect on pancreatic beta (β)-cell dysfunction. To assess the effects of α-mangostin on insulin production, rat pancreatic INS-1 cells were treated with non-toxic doses of α-mangostin (1⁻10 μM) and its impact on insulin signaling was examined by Western blotting...
May 16, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29770908/level-of-hydrogen-peroxide-affects-expression-and-sub-cellular-localization-of-pax6
#3
Sachin Shukla, Rajnikant Mishra
The Pax6 is a multifunctional pairedbox and homeobox containing transcription factor which is involved in several functions of brain, eyes, and pancreas. It regulates expression of genes involved in cell proliferation, differentiation, inflammation, oxidative stress management, and neuropathy. Dynamic changes in the sub-cellular localization of Pax6 are proposed to regulate its activity, however, the underlying mechanism remains poorly understood. The oxidative stress mediated changes were studied in sub-cellular localization of Pax6 in cultured cells derived from the eye (cornea) and pancreas...
May 16, 2018: Molecular Biology Reports
https://www.readbyqxmd.com/read/29770834/advances-in-drug-discovery-for-human-beta-cell-regeneration
#4
REVIEW
Esra Karakose, Courtney Ackeifi, Peng Wang, Andrew F Stewart
The numbers of insulin-secreting pancreatic beta cells are reduced in people with type 1 and type 2 diabetes. Driving beta cell regeneration in the pancreases of people with diabetes would be an attractive approach to reversing diabetes. While adult human beta cells have long been believed to be terminally differentiated and, therefore, irreversibly quiescent, it has become clear over recent years that this is not true. More specifically, both candidate and unbiased high-throughput screen approaches have revealed several classes of molecules that are clearly able to induce human beta cell proliferation...
May 16, 2018: Diabetologia
https://www.readbyqxmd.com/read/29768729/adaptive-changes-in-pancreas-post-roux-en-y-gastric-bypass-induced-weight-loss
#5
A Lautenbach, M Wernecke, N Riedel, J Veigel, J Yamamura, S Keller, R Jung, P Busch, O Mann, F K Knop, J J Holst, J J Meier, J Aberle
AIMS: Obesity has been shown to trigger adaptive increases in pancreas parenchymal and fat volume. Consecutively, pancreatic steatosis may lead to beta-cell dysfunction. However, it is not known, whether the pancreatic tissue components decrease with weight loss and pancreatic steatosis is reversible following RYGB. Therefore, the objective of the study was to investigate the effects of RYGB-induced weight loss on pancreatic volume and glucose homeostasis. MATERIALS AND METHODS: 11 patients were recruited in the Obesity Centre of the University Medical Centre Hamburg-Eppendorf...
May 16, 2018: Diabetes/metabolism Research and Reviews
https://www.readbyqxmd.com/read/29768513/increased-mitochondrial-fission-is-critical-for-hypoxia-induced-pancreatic-beta-cell-death
#6
Da Zhang, Yanfang Liu, Yao Tang, Xiaofeng Wang, Zhichao Li, Rui Li, Zhenyu Ti, Weidong Gao, Jigang Bai, Yi Lv
Hypoxia-mediated pancreatic beta cell death is one of the main causes of pancreatic beta celldeath, which leads to the loss of functional pancreatic beta cell mass and type 1 diabetes andtype 2 diabetes.However, the molecular mechanisms that control life and death of pancreatic beta cells remain poorly understood. Here we showed that mitochondrial fission was strongly induced in pancreatic beta cellsmainly due to an elevation of DRP1S616 phosphorylation through HIF-1αactivation and subsequent DRP1 mitochondrial translocation...
2018: PloS One
https://www.readbyqxmd.com/read/29765386/design-of-a-type-1-diabetes-vaccine-candidate-using-edible-plants-expressing-a-major-autoantigen
#7
Edoardo Bertini, Matilde Merlin, Elisa Gecchele, Andrea Puggia, Annalisa Brozzetti, Mauro Commisso, Alberto Falorni, Vittorio Bini, Victor Klymyuk, Mario Pezzotti, Linda Avesani
Type-1 diabetes (T1D) is a metabolic disease involving the autoimmune destruction of insulin-producing pancreatic beta cells. It is often diagnosed by the detection of autoantibodies, typically those recognizing insulin itself or the 65-kDa isoform of glutamic acid decarboxylase (GAD65). Oral insulin can be used to induce systemic immunological tolerance and thus prevent or delay the onset of T1D, suggesting that combination treatments with other autoantigens such as GAD65 could be even more successful. GAD65 has induced oral tolerance and prevented T1D in preclinical studies but it is difficult to produce in sufficient quantities for clinical testing...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29758199/pafah1b2-is-a-hif1a-target-gene-and-promotes-metastasis-in-pancreatic-cancer
#8
Can Ma, Yan Guo, Yan Zhang, Aixia Duo, Yitao Jia, Ci Liu, Binghui Li
Platelet-activating factor acetylhydrolase IB subunit beta (PAFAH1B2) plays important roles in inflammation and anaphylaxis. However, its primary function in pancreatic cancer remains unclear. In the current study, we report that PAFAH1B2 is overexpressed in pancreatic ductal adenocarcinoma (PDAC) and correlated inversely with patient survival. PAFAH1B2 overexpression induced epithelial-mesenchymal transition (EMT), migration and invasion in vitro and metastasis in vivo. Conversely, silencing PAFAH1B2 inhibited these aggressive phenotypes...
May 11, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29757216/sphingosine-1-phosphate-receptor-1-is-involved-in-non-obese-diabetic-mouse-thymocyte-migration-disorders
#9
Julia P Lemos, Salete Smaniotto, Carolina V Messias, Otacilio C Moreira, Vinicius Cotta-de-Almeida, Mireille Dardenne, Wilson Savino, Daniella A Mendes-da-Cruz
NOD (non-obese diabetic) mice spontaneously develop type 1 diabetes following T cell-dependent destruction of pancreatic β cells. Several alterations are observed in the NOD thymus, including the presence of giant perivascular spaces (PVS) filled with single-positive (SP) CD4⁺ and CD8⁺ T cells that accumulate in the organ. These cells have a decreased expression of membrane CD49e (the α5 integrin chain of the fibronectin receptor VLA-5 (very late antigen-5). Herein, we observed lower sphingosine-1-phosphate receptor 1 (S1P1) expression in NOD mouse thymocytes when compared with controls, mainly in the mature SP CD4⁺CD62Lhi and CD8⁺CD62Lhi subpopulations bearing the CD49e− phenotype...
May 12, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29757200/a-rationally-designed-hsp70-variant-rescues-the-aggregation-associated-toxicity-of-human-iapp-in-cultured-pancreatic-islet-%C3%AE-cells
#10
Marie Nicole Bongiovanni, Francesco Antonio Aprile, Pietro Sormanni, Michele Vendruscolo
Molecular chaperones are key components of the protein homeostasis system against protein misfolding and aggregation. It has been recently shown that these molecules can be rationally modified to have an enhanced activity against specific amyloidogenic substrates. The resulting molecular chaperone variants can be effective inhibitors of protein aggregation in vitro, thus suggesting that they may provide novel opportunities in biomedical and biotechnological applications. Before such opportunities can be exploited, however, their effects on cell viability should be better characterised...
May 12, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29756464/glucose-acutely-reduces-cytosolic-and-mitochondrial-h-sub-2-sub-o-sub-2-sub-in-rat-pancreatic-beta-cells
#11
Jean-Philippe Deglasse, Leticia Prates Roma, Daniel Pastor-Flores, Patrick Gilon, Tobias P Dick, Jean-Christophe Jonas
AIMS: Whether H<sub>2</sub>O<sub>2</sub> contributes to the glucose-dependent stimulation of insulin secretion by pancreatic β-cells is highly controversial. We used two H<sub>2</sub>O<sub>2</sub>-sensitive probes, roGFP2-Orp1 and HyPer with its pH-control SypHer, to test the acute effects of glucose, monomethylsuccinate, leucine with glutamine, and α-ketoisocaproate, on β-cell cytosolic and mitochondrial H<sub>2</sub>O<sub>2</sub> concentrations...
May 14, 2018: Antioxidants & Redox Signaling
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
#12
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/29754174/targeting-mirna-for-therapy-of-juvenile-and-adult-diabetic-cardiomyopathy
#13
Shyam Sundar Nandi, Paras Kumar Mishra
Prevalence of diabetes mellitus (DM), a multifactorial disease often diagnosed with high blood glucose levels, is rapidly increasing in the world. Association of DM with multi-organ dysfunction including cardiomyopathy makes it a leading cause of morbidity and mortality. There are two major types of DM: type 1 DM (T1D) and type 2 DM (T2D). T1D is diagnosed by reduced levels of insulin and high levels of glucose in the blood. It is caused due to pancreatic beta cell destruction/loss, and mostly found in juveniles (juvenile DM)...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29751963/ameliorative-effects-of-bone-marrow-derived-pancreatic-progenitor-cells-on-hyperglycemia-and-oxidative-stress-in-diabetic-rats
#14
Hamdy Rizk, A F Tohamy, Walaa Mohamed Sayed, Abdelbary Prince
The present study aimed to investigate the effects of Bone marrow derived pancreatic progenitor cells (BM- PPCs) in diabetic rats. It was conducted on 30 adult male Sprague-Dawley rats weighing 200-220 g. They were divided into three groups: (a) Group 1 was the control group; (b) Group 2 was the diabetic (induced diabetic by a single intraperitoneal (IP) injection of streptozotocin (STZ) (60 mg/kg) and (c) Group 3 was the treated (received injection of 2.5 X 106 BM- PPCs via the tail vein twice with a 21-day time interval)...
May 8, 2018: Acta Histochemica
https://www.readbyqxmd.com/read/29751319/molecular-modelling-and-synthesis-of-spiroimidazolidine-2-4-diones-with-dual-activities-as-hypoglycemic-agents-and-selective-inhibitors-of-aldose-reductase
#15
Manar G Salem, Yasmine M Abdel Aziz, Marwa Elewa, Hosam A Elshihawy, Mohamed M Said
Novel derivatives of spiroimidazolidinedione were synthesized and evaluated as hypoglycemic agents through binding to sulfonylurea receptor 1 (SUR1) in pancreatic beta-cells. Their selectivity index was calculated against both aldehyde reductase (ALR1) and aldose reductase (ALR2). Aldehyde reductase is a key enzyme in the polyol pathway that is involved in the etiology of the secondary diabetic complications. All structures were confirmed by microanalysis and by IR, 1 H NMR, 13 C NMR and EI-MS spectroscopy...
May 2, 2018: Bioorganic Chemistry
https://www.readbyqxmd.com/read/29749986/-urtica-dioica-distillate-regenerates-pancreatic-beta-cells-in-streptozotocin-induced-diabetic-rats
#16
Ali Gohari, Ali Noorafshan, Masoumeh Akmali, Fahimeh Zamani-Garmsiri, Atefeh Seghatoleslam
Background: Urtica dioica is known as an anti-hyperglycemic plant. Urtica dioica distillate (UD) is a traditional Iranian drink, locally known as "aragh gazaneh". In spite of its widespread consumption in Iran, according to traditional Iranian medicine, there is no scientific report on the usefulness of UD for diabetic patients. This survey was designed to evaluate its protective effects for the recovery from diabetes by determining the serum insulin, blood glucose, volume of pancreatic islets, and the number and volume of β-cells in diabetic rats...
March 2018: Iranian Journal of Medical Sciences
https://www.readbyqxmd.com/read/29739054/dioscin-promotes-proliferation-of-pancreatic-beta-cells-via-wnt-%C3%AE-catenin-signaling-pathways
#17
Fengyun Yu, Leilei Bing, Yanrong Xie, Wenjuan Yu
BACKGROUND: Dysfunction of pancreatic beta cells is related with type 2 diabetes mellitus. Dioscin, a natural steroid saponin, has many pharmacological effects. The aim of this study was to investigate the effects of dioscin on apoptosis of pancreatic beta cells induced by high glucose. METHODS: Pancreatic cell line RNAKT-15 was treated with 20 mM glucose with or without different concentrations of dioscin and viability and apoptosis of cells were measured. Western blot assay was used to measure the expression levels of some proteins such as phosphorylated glycogen synthase kinase 3β (GSK-3β) and β-catenin...
May 1, 2018: Clinical Laboratory
https://www.readbyqxmd.com/read/29736712/cell-based-methods-to-identify-inducers-of-human-pancreatic-beta-cell-proliferation
#18
Courtney A Ackeifi, Ethan A Swartz, Peng Wang
Diabetes is the result of the insufficiency or dysfunction of pancreatic beta cells alone or in combination with insulin resistance. The replacement or regeneration of beta cells can effectively reverse diabetes in humans and rodents. Therefore, the identification of novel small molecules that promote pancreatic beta-cell proliferation is an attractive approach for diabetic therapy. While numerous hormones, small molecules, and growth factors are able to drive rodent beta cells to replicate, only a few small molecules have demonstrated the ability to stimulate human beta-cell proliferation...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29734117/nkx6-1-induced-pluripotent-stem-cell-reporter-lines-for-isolation-and-analysis-of-functionally-relevant-neuronal-and-pancreas-populations
#19
Shailesh Kumar Gupta, Agata Wesolowska-Andersen, Anna K Ringgaard, Himjyot Jaiswal, Luyan Song, Benoit Hastoy, Camilla Ingvorsen, Amir Taheri-Ghahfarokhi, Björn Magnusson, Marcello Maresca, Rikke R Jensen, Nicola L Beer, Johannes J Fels, Lars G Grunnet, Melissa K Thomas, Anna L Gloyn, Ryan Hicks, Mark I McCarthy, Mattias Hansson, Christian Honoré
Recent studies have reported significant advances in the differentiation of human pluripotent stem cells to clinically relevant cell types such as the insulin producing beta-like cells and motor neurons. However, many of the current differentiation protocols lead to heterogeneous cell cultures containing cell types other than the targeted cell fate. Genetically modified human pluripotent stem cells reporting the expression of specific genes are of great value for differentiation protocol optimization and for the purification of relevant cell populations from heterogeneous cell cultures...
April 23, 2018: Stem Cell Research
https://www.readbyqxmd.com/read/29731775/three-dimensional-bioreactor-technologies-for-the-cocultivation-of-human-mesenchymal-stem-stromal-cells-and-beta-cells
#20
REVIEW
Florian Petry, Tobias Weidner, Peter Czermak, Denise Salzig
Diabetes is a prominent health problem caused by the failure of pancreatic beta cells. One therapeutic approach is the transplantation of functional beta cells, but it is difficult to generate sufficient beta cells in vitro and to ensure these cells remain viable at the transplantation site. Beta cells suffer from hypoxia, undergo apoptosis, or are attacked by the host immune system. Human mesenchymal stem/stromal cells (hMSCs) can improve the functionality and survival of beta cells in vivo and in vitro due to direct cell contact or the secretion of trophic factors...
2018: Stem Cells International
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