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pancreatic beta cell

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https://www.readbyqxmd.com/read/28942280/nitrate-induces-a-type-1-diabetic-profile-in-alligator-hatchlings
#1
Thea M Edwards, Heather J Hamlin, Haley Freymiller, Stephen Green, Jenna Thurman, Louis J Guillette
Type 1 diabetes (T1D) is a chronic autoimmune disease that affects 1 in 300 children by age 18. T1D is caused by inflammation-induced loss of insulin-producing pancreatic beta cells, leading to high blood glucose and a host of downstream complications. Although multiple genes are associated with T1D risk, only 5% of genetically susceptible individuals actually develop clinical disease. Moreover, a growing number of T1D cases occur in geographic clusters and among children with low risk genotypes. These observations suggest that environmental factors contribute to T1D etiology...
September 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28939870/different-developmental-histories-of-beta-cells-generate-functional-and-proliferative-heterogeneity-during-islet-growth
#2
Sumeet Pal Singh, Sharan Janjuha, Theresa Hartmann, Özge Kayisoglu, Judith Konantz, Sarah Birke, Priyanka Murawala, Ezzaldin Ahmed Alfar, Kei Murata, Anne Eugster, Naoki Tsuji, Edward R Morrissey, Michael Brand, Nikolay Ninov
The proliferative and functional heterogeneity among seemingly uniform cells is a universal phenomenon. Identifying the underlying factors requires single-cell analysis of function and proliferation. Here we show that the pancreatic beta-cells in zebrafish exhibit different growth-promoting and functional properties, which in part reflect differences in the time elapsed since birth of the cells. Calcium imaging shows that the beta-cells in the embryonic islet become functional during early zebrafish development...
September 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28938416/pancreatic-histopathology-of-human-monogenic-diabetes-due-to-causal-variants-in-kcnj11-hnf1a-gata6-and-lmna
#3
May Sanyoura, Laura Jacobsen, David Carmody, Daniela Del Gaudio, Gorka Alkorta-Aranburu, Kelly Arndt, Ying Ying Hu, Frances Kobiernicki, Irina Kusmartseva, Mark A Atkinson, Louis H Philipson, Desmond Schatz, Martha Campbell-Thompson, Siri Atma W Greeley
Context: Monogenic diabetes is thought to account for 2% of all diabetes cases but most patients are misdiagnosed as type 1 or type 2 diabetes. To date, little is known about the histopathological features of pancreases from patients with monogenic diabetes. Objective: Retrospective study of the JDRF Network for Pancreatic Organ donors with Diabetes biorepository was used to identify possible cases with monogenic diabetes and to compare effects of genetic variants on pancreas histology...
August 16, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28933769/a-lanosteryl-triterpene-from-protorhus-longifolia-improves-glucose-tolerance-and-pancreatic-beta-cell-ultrastructure-in-type-2-diabetic-rats
#4
Sihle E Mabhida, Rebamang A Mosa, Dambudzo Penduka, Foluso O Osunsanmi, Phiwayinkosi V Dludla, Tryana G Djarova, Andy R Opoku
Type 2 diabetes remains one of the leading causes of death worldwide. Persistent hyperglycemia within a diabetic state is implicated in the generation of oxidative stress and aggravated inflammation that is responsible for accelerated modification of pancreatic beta cell structure. Here we investigated whether a lanosteryl triterpene, methyl-3β-hydroxylanosta-9,24-dien-21-oate (RA-3), isolated from Protorhus longifolia can improve glucose tolerance and pancreatic beta cell ultrastructure by reducing oxidative stress and inflammation in high fat diet and streptozotocin-induced type 2 diabetes in rats...
July 26, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28932254/branched-chain-amino-acid-supplementation-restores-reduced-insulinotropic-activity-of-a-low-protein-diet-through-the-vagus-nerve-in-rats
#5
Mami Horiuchi, Tomoya Takeda, Hiroyuki Takanashi, Yori Ozaki-Masuzawa, Yusuke Taguchi, Yuka Toyoshima, Lila Otani, Hisanori Kato, Meri Sone-Yonezawa, Fumihiko Hakuno, Shin-Ichiro Takahashi, Asako Takenaka
BACKGROUND: Previously, we reported that a low-protein diet significantly reduced insulin secretion in response to feeding within 1 h in rats, suggesting that the insulinotropic effect of dietary protein plays an important role in maintaining normal insulin release. The current study aimed to elucidate whether deficiency of certain amino acids could diminish the insulinotropic activity and to investigate whether reduced insulin secretion in response to a low-protein diet is restored by supplementation with certain amino acids...
2017: Nutrition & Metabolism
https://www.readbyqxmd.com/read/28929027/the-role-of-polycarbonate-monomer-bisphenol-a-in-insulin-resistance
#6
Milos Pjanic
Bisphenol A (BPA) is a synthetic unit of polycarbonate polymers and epoxy resins, the types of plastics that could be found in essentially every human population and incorporated into almost every aspect of the modern human society. BPA polymers appear in a wide range of products, from liquid storages (plastic bottles, can and glass linings, water pipes and tanks) and food storages (plastics wraps and containers), to medical and dental devices. BPA polymers could be hydrolyzed spontaneously or in a photo- or temperature-catalyzed process, providing widespread environmental distribution and chronic exposure to the BPA monomer in contemporary human populations...
2017: PeerJ
https://www.readbyqxmd.com/read/28925365/generation-of-an-induced-pluripotent-stem-cell-ipsc-line-from-a-patient-with-maturity-onset-diabetes-of-the-young-type-13-mody13-with-a-the-potassium-inwardly-rectifying-channel-subfamily-j-member-11-kcnj11-mutation
#7
Frank Griscelli, Olivier Feraud, Tony Ernault, Noufissa Oudrihri, Ali G Turhan, Amélie Bonnefond, Philippe Froguel, Annelise Bennaceur-Griscelli
Heterozygous activating mutation (p.Glu227Lys) in KCNJ11 leads to maturity-onset diabetes of the young (MODY) type 13, that is a subtype of dominant inherited young-onset non-autoimmune diabetes due to a primary defect in pancreatic beta cells. We generated induced pluripotent stem cells (iPSCs) from a patient with KCNJ11(p.Glu227Lys) mutation who developed MODY at 13years old. KCNJ11(p.Glu227Lys)-mutated cells that were reprogrammed by non-integrative viral transduction had normal karyotype, harboured the KCNJ11(p...
August 2017: Stem Cell Research
https://www.readbyqxmd.com/read/28924486/expression-of-transcription-factors-in-men1-associated-pancreatic-neuroendocrine-tumors
#8
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/28921917/changes-on-the-pancreas-in-experimental-diabetes-and-the-effect-of-lycopene-on-these-changes-pdx-1-ngn-3-and-nestin-expressions
#9
Mustafa Sandıkcı, Levent Karagenc, Mustafa Yıldız
The aim of the present study was to investigate changes occurring in the number of beta cells, as well as the expressions of Ngn-3, nestin and Pdx-1 of pancreatic progenitor cells in the pancreas of experimentally-induced adult diabetic rats and to determine the effect of orally-administered lycopene on these changes. Following the administration of 50 mg/kg streptozotocin to rats, four groups of animals were established: control+corn oil, control+lycopene, diabetic+corn oil and diabetic+lycopene. The animals in the control+lycopene and diabetic+lycopene groups received 4 mg/kg lycopene for a period of four weeks...
September 16, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
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
#10
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/28914811/leptolide-improves-insulin-resistance-in-diet-induced-obese-mice
#11
Pablo Villa-Pérez, Mercedes Cueto, Ana R Díaz-Marrero, Carmen D Lobatón, Alfredo Moreno, Germán Perdomo, Irene Cózar-Castellano
Type 2 diabetes (T2DM) is a complex disease linked to pancreatic beta-cell failure and insulin resistance. Current antidiabetic treatment regimens for T2DM include insulin sensitizers and insulin secretagogues. We have previously demonstrated that leptolide, a member of the furanocembranolides family, promotes pancreatic beta-cell proliferation in mice. Considering the beneficial effects of leptolide in diabetic mice, in this study, we aimed to address the capability of leptolide to improve insulin resistance associated with the pathology of obesity...
September 15, 2017: Marine Drugs
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/28900540/treatment-of-diabetic-mice-with-the-sglt2-inhibitor-ta-1887-antagonizes-diabetic-cachexia-and-decreases-mortality
#13
Taichi Sugizaki, Shunshun Zhu, Ge Guo, Akiko Matsumoto, Jiabin Zhao, Motoyoshi Endo, Haruki Horiguchi, Jun Morinaga, Zhe Tian, Tsuyoshi Kadomatsu, Keishi Miyata, Hiroshi Itoh, Yuichi Oike
A favorable effect of an inhibitor of the sodium-glucose cotransporter 2 (SGLT2i) on mortality of diabetic patients was recently reported, although mechanisms underlying that effect remained unclear. Here, we examine SGLT2i effects on survival of diabetic mice and assess factors underlying these outcomes. To examine SGLT2i treatment effects in a model of severe diabetes, we fed genetically diabetic db/db mice a high-fat diet and then assessed outcomes including diabetic complications between SGLT2i TA-1887-treated and control mice...
2017: NPJ Aging and Mechanisms of Disease
https://www.readbyqxmd.com/read/28898917/technical-aspects-of-endoscopic-ultrasound-eus-guided-sampling-in-gastroenterology-european-society-of-gastrointestinal-endoscopy-esge-technical-guideline-march-2017
#14
Marcin Polkowski, Christian Jenssen, Philip Kaye, Silvia Carrara, Pierre Deprez, Angels Gines, Gloria Fernández-Esparrach, Pierre Eisendrath, Guruprasad P Aithal, Paolo Arcidiacono, Marc Barthet, Pedro Bastos, Adele Fornelli, Bertrand Napoleon, Julio Iglesias-Garcia, Andrada Seicean, Alberto Larghi, Cesare Hassan, Jeanin E van Hooft, Jean-Marc Dumonceau
For routine EUS-guided sampling of solid masses and lymph nodes (LNs) ESGE recommends 25G or 22G needles (high quality evidence, strong recommendation); fine needle aspiration (FNA) and fine needle biopsy (FNB) needles are equally recommended (high quality evidence, strong recommendation).When the primary aim of sampling is to obtain a core tissue specimen, ESGE suggests using 19G FNA or FNB needles or 22G FNB needles (low quality evidence, weak recommendation).ESGE recommends using 10-mL syringe suction for EUS-guided sampling of solid masses and LNs with 25G or 22G FNA needles (high quality evidence, strong recommendation) and other types of needles (low quality evidence, weak recommendation)...
September 12, 2017: Endoscopy
https://www.readbyqxmd.com/read/28898241/alterations-in-the-programming-of-energy-metabolism-in-adolescents-with-background-exposure-to-dioxins-dl-pcbs-and-pbdes
#15
Marike M Leijs, Janna G Koppe, Thomas Vulsma, Kees Olie, Wim M C van Aalderen, Pim de Voogt, Juliette Legler, Gavin W Ten Tusscher
OBJECTIVES: Dioxins and PCBs are highly toxic and persistent environmental pollutants that are measurable in humans worldwide. These persistent organic pollutants are associated with a higher incidence of diabetes mellitus. We hypothesise that perinatal (background) exposure to industrial pollutants like dioxins also influences body mass development and energy metabolism in later life. STUDY DESIGN: In The Netherlands, the perinatal exposure (prenatal exposure and postnatal lactational intake) to dioxins has been studied prospectively since 1987...
2017: PloS One
https://www.readbyqxmd.com/read/28895584/effects-of-lobeglitazone-a-novel-thiazolidinedione-on-adipose-tissue-remodeling-and-brown-and-beige-adipose-tissue-development-in-db-db-mice
#16
G Kim, Y-H Lee, M R Yun, J-Y Lee, E G Shin, B-W Lee, E S Kang, B-S Cha
BACKGROUND/OBJECTIVES: We investigated the effect of long-term treatment with lobeglitazone, a novel thiazolidinedione-based activator of PPARγ, on adipose tissue (AT), focusing on its effects on insulin resistance in obese db/db mice. METHODS: Seven-week-old male db/db mice were assigned to either a vehicle-treated (n=8) or lobeglitazone-treated (n=8) group. Lobeglitazone (1 mg/kg daily) was injected intraperitoneally for 20 weeks. RESULTS: Lobeglitazone treatment for 20 weeks resulted in a remarkably improved glycemic index, including significantly decreased glucose levels, enhanced insulin sensitivity, and preserved pancreatic beta cells...
September 12, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28893685/protective-effects-of-a-g-lucidum-proteoglycan-on-ins-1-cells-against-iapp-induced-apoptosis-via-attenuating-endoplasmic-reticulum-stress-and-modulating-chop-jnk-pathways
#17
Yan-Ming He, Qiang Zhang, Min Zheng, Zhao-Hua Fan, Yun-Hao Li, Dan Zhang, Zeng Zhang, Sha-Sha Yuan, Yan-Yan Wang, Ping Zhou, Hong-Jie Yang
Fudan-Yueyang-G. lucidum (FYGL) is a water-soluble macromolecular proteoglycan extracted from Ganoderma lucidum which has been used for health promotion for a long time in China. The aim of this study was to investigate the protective effects of FYGL on INS-1 rat insulinoma beta cells against IAPP-induced cell apoptosis, as well as the underlying mechanisms. The results showed that apoptotic cells were significantly increased when incubated with islet amyloid polypeptide (IAPP). However, cytotoxicity of IAPP was significantly attenuated by co-incubation of the cells with FYGL...
September 8, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28892926/antidiabetic-activity-of-aqueous-extract-of-solanum-nigrum-linn-berries-in-alloxan-induced-diabetic-wistar-albino-rats
#18
M S Umamageswari, T M Karthikeyan, Yasmeen A Maniyar
INTRODUCTION: Solanum nigrum Linn. is a common medicinal plant possessing a wide variety of pharmacological activity. Current treatment of diabetes mellitus has plenty of adverse effects necessitating the search of alternate drugs. AIM: Evaluation of antidiabetic effect of Aqueous Extract of Solanum Nigrum Linn Berries (AESNB) in alloxan induced diabetic Wistar rats. MATERIALS AND METHODS: There were five groups (normal control, diabetic control, AESNB 200 mg/kg/day, ASENB 400 mg/kg/day and standard i...
July 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28892258/sitagliptin-and-roux-en-y-gastric-bypass-modulate-insulin-secretion-via-regulation-of-intra-islet-pyy
#19
Claudia Guida, Laura J McCulloch, Mahdieh Godazgar, Sam D Stephen, Charlotte Baker, Davide Basco, Jiawen Dong, Duan Chen, Anne Clark, Reshma D Ramracheya
AIMS: The gut hormone peptide tyrosine tyrosine (PYY) is critical for maintaining islet integrity and restoring islet function following Roux-en-Y gastric bypass (RYGB). The expression of PYY and its receptors (NPYRs) in islets has been documented but not fully characterized. Modulation of islet PYY by the proteolytic enzyme DPP-IV has not been investigated and the impact of DPP-IV inhibition on islet PYY function remains unexplored. Here we have addressed these gaps and their effects on glucose-stimulated insulin secretion (GSIS)...
September 11, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28891030/species-differences-in-pancreatic-binding-of-do3a-vs-cys-40-exendin4
#20
Olof Eriksson, Ulrika Rosenström, Ram K Selvaraju, Barbro Eriksson, Irina Velikyan
AIMS: Radiolabeled Exendin-4 has been proposed as suitable imaging marker for pancreatic beta cell mass quantification mediated by Glucagon-like peptide-1 receptor (GLP-1R). However, noticeable species variations in basal pancreatic uptake as well as uptake reduction degree due to selective beta cell ablation were observed. METHODS: In vitro and ex vivo autoradiography studies of pancreas were performed using [(177)Lu]Lu-DO3A-VS-Cys(40)-Exendin4, in order to investigate the mechanism of uptake as well as the islet uptake contrast in mouse, rat, pig, and non-human primate...
September 11, 2017: Acta Diabetologica
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