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er stress and diabetes

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https://www.readbyqxmd.com/read/28065589/perk-and-xbp1-differentially-regulate-cxcl10-and-ccl2-production
#1
Shuang Zhu, Hua Liu, Haibo Sha, Ling Qi, Dian-Shuai Gao, Wenbo Zhang
Inflammation plays a key role in the pathogenesis of many retinal degenerative diseases related with photoreceptor dysfunction/degeneration. However the involvement of photoreceptor cells in inflammatory reactions is largely unknown as they are not considered as inflammatory cells. In this study, we assessed whether photoreceptor cells can produce CCL2 and CXCL10, two important players in inflammation during endoplasmic reticulum (ER) stress. After photoreceptor 661 W cells were treated with ER stress inducer thapsigargin (TG), induction of ER stress increased CXCL10 and CCL2 expression at both mRNA and protein levels, which was significantly blocked by an ER stress blocker 4-phenylbutyrate...
January 5, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28064130/a-new-endoplasmic-reticulum-targeted-two-photon-fluorescent-probe-for-imaging-of-superoxide-anion-in-diabetic-mice
#2
Haibin Xiao, Xiao Liu, Chuanchen Wu, Yaohuan Wu, Ping Li, Xiaomeng Guo, Bo Tang
Excessive or unfolded proteins accumulation in endoplasmic reticulum (ER) will cause ER stress, which has evolved to involve in various metabolic diseases. In particular, ER stress plays an important role in the pathogenesis of diabetes. Both ER stress and course of diabetes accompany oxidative stress and production of reactive oxygen species (ROS), among which superoxide anion (O2(•-)) is the first produced ROS and has been recognized as cell signaling mediator involved in the physiological and pathological process of diabetes...
December 31, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28062922/interferon-%C3%AE-mediates-human-beta-cell-hla-class-i-overexpression-endoplasmic-reticulum-stress-and-apoptosis-three-hallmarks-of-early-human-type-1-diabetes
#3
Laura Marroqui, Reinaldo S Dos Santos, Anne Op de Beeck, Alexandra Coomans de Brachène, Lorella Marselli, Piero Marchetti, Decio L Eizirik
AIMS/HYPOTHESIS: Three hallmarks of the pancreatic islets in early human type 1 diabetes are overexpression of HLA class I, endoplasmic reticulum (ER) stress and beta cell apoptosis. The mediators of these phenomena remain to be defined. The type I interferon IFNα is expressed in human islets from type 1 diabetes patients and mediates HLA class I overexpression. We presently evaluated the mechanisms involved in IFNα-induced HLA class I expression in human beta cells and determined whether this cytokine contributes to ER stress and apoptosis...
January 6, 2017: Diabetologia
https://www.readbyqxmd.com/read/28029143/troxerutin-attenuates-enhancement-of-hepatic-gluconeogenesis-by-inhibiting-nod-activation-mediated-inflammation-in-high-fat-diet-treated-mice
#4
Zifeng Zhang, Xin Wang, Guihong Zheng, Qun Shan, Jun Lu, Shaohua Fan, Chunhui Sun, Dongmei Wu, Cheng Zhang, Weitong Su, Junwen Sui, Yuanlin Zheng
Recent evidence suggests that troxerutin, a trihydroxyethylated derivative of natural bioflavonoid rutin, exhibits beneficial effects on diabetes-related symptoms. Here we investigated the effects of troxerutin on the enhancement of hepatic gluconeogenesis in high-fat diet (HFD)-treated mice and the mechanisms underlying these effects. Mice were divided into four groups: Control group, HFD group, HFD + Troxerutin group, and Troxerutin group. Troxerutin was treated by daily oral administration at doses of 150 mg/kg/day for 20 weeks...
December 25, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28025459/tgp-attenuates-endoplasmic-reticulum-stress-and-regulates-the-expression-of-thioredoxin-interacting-protein-in-the-kidneys-of-diabetic-rats
#5
Yunxia Shao, Xiangming Qi, Xinxing Xu, Kun Wang, Yonggui Wu, Lingling Xia
Recent evidence suggests that the endoplasmic reticulum stress (ERS)-thioredoxin-interacting protein (TXNIP)-inflammation chain contributes to diabetic renal injury. The aim of the current study was to investigate whether total glucosides of peony (TGP) could inhibit ERS and attenuate up-regulation of TXNIP in the kidneys of rats with streptozotocin-induced diabetes. TGP was orally administered daily at a dose of 50, 100, or 200 mg/kg for 8 weeks. The expression of glucose-regulated protein 78 (GRP78), phospho-protein kinase RNA-like ER kinase (p-PERK), phosphor- eukaryotic translation initiation factor 2α (p-eIF2α), C/EBP-homologous protein (CHOP), and TXNIP was assessed...
December 24, 2016: Bioscience Trends
https://www.readbyqxmd.com/read/28024901/cyclin-dependent-kinase-5-contributes-to-endoplasmic-reticulum-stress-induced-podocyte-apoptosis-via-promoting-mekk1-phosphorylation-at-ser280-in-diabetic-nephropathy
#6
Yue Zhang, Xiang Gao, Shuanggang Chen, Min Zhao, Jing Chen, Rui Liu, Shengyang Cheng, Mengyuan Qi, Shuo Wang, Wei Liu
Endoplasmic reticulum (ER) stress has been reported to be associated with podocyte apoptosis in diabetic nephropathy, but the mechanism of ER signaling in podocyte apoptosis hasn't been fully understood. Our previous studies have demonstrated that Cyclin-dependent kinase 5 (Cdk5) was associated with podocyte apoptosis in diabetic nephropathy. The present study was designed to examine whether and how Cdk5 activity plays a role in ER stress induced podocyte apoptosis in diabetic nephropathy. The results showed that along with induction of Cdk5 and apoptosis, GRP78 and its two sensors as well as CHOP and cleaved caspase-12 were induced in high glucose treated podocytes...
December 24, 2016: Cellular Signalling
https://www.readbyqxmd.com/read/28012960/heme-oxygenase-ho-1-induction-prevents-endoplasmic-reticulum-stress-mediated-endothelial-cell-death-and-impaired-angiogenic-capacity
#7
Hatem Maamoun, Matshediso Zachariah, John H McVey, Fiona R Green, Abdelali Agouni
Most of diabetic cardiovascular complications are attributed to endothelial dysfunction and impaired angiogenesis. Endoplasmic Reticulum (ER) and oxidative stresses were shown to play a pivotal role in the development of endothelial dysfunction in diabetes. Hemeoxygenase-1 (HO-1) was shown to protect against oxidative stress in diabetes; however, its role in alleviating ER stress-induced endothelial dysfunction remains not fully elucidated. We aim here to test the protective role of HO-1 against high glucose-mediated ER stress and endothelial dysfunction and understand the underlying mechanisms with special emphasis on oxidative stress, inflammation and cell death...
December 21, 2016: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28000870/quercetin-alleviates-cell-apoptosis-and-inflammation-via-the-er-stress-pathway-in-vascular-endothelial-cells-cultured-in-high-concentrations-of-glucosamine
#8
Xiaxia Cai, Lei Bao, Ye Ding, Xiaoqian Dai, Zhaofeng Zhang, Yong Li
Glucosamine is a possible cause of vascular endothelial injury in the initial stages of atherosclerosis, through endoplasmic reticulum (ER) stress resulting in fatty streaks in the vascular wall. Quercetin is an anti‑diabetic and cardiovascular protective agent that has previously been demonstrated to reduce ER stress in human umbilical vein endothelial cells (HUVECs). The present study aimed to investigate whether quercetin prevents glucosamine‑induced apoptosis and inflammation via ER stress pathway in HUVECs...
December 15, 2016: Molecular Medicine Reports
https://www.readbyqxmd.com/read/27998959/exogenous-h2s-regulates-endoplasmic-reticulum-mitochondria-cross-talk-to-inhibit-apoptotic-pathways-in-stz-induced-type-i-diabetes
#9
Fan Yang, Xiangjing Yu, Ting Li, Jianjun Wu, YaJun Zhao, Aili Sun, Shiyun Dong, Jichao Wu, Xin Zhong, Changqing Xu, Fanghao Lu, Weihua Zhang
BACKGROUND: The upregulation of reactive oxygen species (ROS) is a primary cause of cardiomyocyte apoptosis in Diabetes cardiomyopathy (DCM). Mitofusin-2 (Mfn-2) is a key protein that bridges the mitochondria and endoplasmic reticulum(ER). Hydrogen sulfide (H2S)-mediated cardioprotection is related to antioxidant effects. The present study demonstrated that H2S inhibited the interaction between the ER and mitochondrial apoptotic pathway. METHODS: This study investigated cardiac function, ultrastructural changes in the ER and mitochondria, apoptotic rate using TUNEL and the expression of ER stress-associated proteins and mitochondrial apoptotic proteins in cardiac tissues in STZ-induced type I diabetic rats treated with or without NaHS (donor of H2S)...
December 20, 2016: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27984799/antidiabetic-activity-of-embelia-ribes-embelin-and-its-derivatives-a-systematic-review-and-meta-analysis
#10
REVIEW
Sharanbasappa Durg, Veeresh P Veerapur, Satrasala Neelima, Shivsharan B Dhadde
Embelia ribes (ER) has been documented in Ayurveda for treating various diseases, including diabetes mellitus (DM). The present systematic review and meta-analysis evaluated the efficacy and safety of ER and its active bio-marker, embelin and its derivatives in the treatment of DM. Literature search was performed in PubMed/MEDLINE, EMBASE, Scopus, ScienceDirect, Scifinder, and Google Scholar. Using Review Manager, meta-analysis of ER/embelin/derivatives of embelin versus diabetic control was performed with inverse-variance model, providing mean differences (MDs) and 95% confidence intervals (CIs)...
December 13, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27981457/bariatric-surgery-ameliorates-diabetic-cardiac-dysfunction-by-inhibiting-er-stress-in-a-diabetic-rat-model
#11
Xiaoqian Zhang, Shaozhuang Liu, Guangyong Zhang, Mingwei Zhong, Teng Liu, Meng Wei, Dong Wu, Xin Huang, Yugang Cheng, Qunzheng Wu, Sanyuan Hu
BACKGROUND: Cardiac dysfunction is a severe complication of diabetes, with no effective treatment. Currently, bariatric surgery is more and more widely used to attenuate diabetes-associated diseases. The mechanism is not clear. Endoplasmic reticulum (ER) stress-dependent apoptosis has been observed in the progression of diabetic myocardium damage. Therefore, this research was designed to investigate the effects of different bariatric procedures on cardiac dysfunction via ER stress-induced cardiomyocyte apoptosis pathway in a diabetic rat model...
December 15, 2016: Obesity Surgery
https://www.readbyqxmd.com/read/27957794/brd7-mediates-hyperglycaemia-induced-myocardial-apoptosis-via-endoplasmic-reticulum-stress-signalling-pathway
#12
Xiao-Meng Wang, Ying-Cui Wang, Xiang-Juan Liu, Qi Wang, Chun-Mei Zhang, Li-Ping Zhang, Hui Liu, Xin-Yu Zhang, Yang Mao, Zhi-Ming Ge
Bromodomain-containing protein 7 (BRD7) is a tumour suppressor that is known to regulate many pathological processes including cell growth, apoptosis and cell cycle. Endoplasmic reticulum (ER) stress-induced apoptosis plays a key role in diabetic cardiomyopathy (DCM). However, the molecular mechanism of hyperglycaemia-induced myocardial apoptosis is still unclear. We intended to determine the role of BRD7 in high glucose (HG)-induced apoptosis of cardiomyocytes. In vivo, we established a type 1 diabetic rat model by injecting a high-dose streptozotocin (STZ), and lentivirus-mediated short hairpin RNA (shRNA) was used to inhibit BRD7 expression...
December 13, 2016: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/27931122/modulation-of-pancreatic-islets-function-and-survival-during-aging-involves-the-differential-regulation-of-endoplasmic-reticulum-stress-by-p21-and-chop
#13
Chrysovalantou Mihailidou, Ioulia Chatzistamou, Athanasios Papavassiliou, Hippokratis Kiaris
AIMS: While endoplasmic reticulum (ER) stress is recognized as a major mechanism causing pancreatic dysfunction in diabetes, little is known on how aging modulates the process. Here we compared the response to ER stress, viability and insulin release from pancreatic islets of young (6 weeks) or aged (14 months) mice. RESULTS: Islets from aged mice were more sensitive to ER stress than their younger counterparts, they exhibited more pronounced unfolded protein response (UPR) and caspase activation and displayed compromised insulin release after high glucose stimulation...
December 8, 2016: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/27914514/protective-effects-of-fish-oil-and-pioglitazone-on-pancreatic-tissue-in-obese-kk-mice-with-type-2-diabetes
#14
Yuzuru Iizuka, Hyounju Kim, Takuya Izawa, Koji Sakurai, Satoshi Hirako, Masahiro Wada, Akiyo Matsumoto
n-3 Polyunsaturated fatty acids, such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), have protective effects against the pancreatic β-cell dysfunction through several mechanisms. Thiazolidines are insulin sensitizers and are used in treating patients with type 2 diabetes. Our previous study demonstrated that a combination of fish oil, which is rich with EPA and DHA, and pioglitazone exerts beneficial effects on obesity and diabetes through their actions on the liver and adipose tissue. However, it remains largely unknown whether such combination therapy affects the pancreas...
December 2016: Prostaglandins, Leukotrienes, and Essential Fatty Acids
https://www.readbyqxmd.com/read/27909574/characterization-of-5-2-18-f-fluoroethoxy-l-tryptophan-for-pet-imaging-of-the-pancreas
#15
Ahmed Abbas, Christine Beamish, Rebecca McGirr, John Demarco, Neil Cockburn, Dawid Krokowski, Ting-Yim Lee, Michael Kovacs, Maria Hatzoglou, Savita Dhanvantari
Purpose: In diabetes, pancreatic beta cell mass declines significantly prior to onset of fasting hyperglycemia. This decline may be due to endoplasmic reticulum (ER) stress, and the system L amino acid transporter LAT1 may be a biomarker of this process. In this study, we used 5-(2- (18)F-fluoroethoxy)-L-tryptophan ( (18)F-L-FEHTP) to target LAT1 as a potential biomarker of beta cell function in diabetes. Procedures: Uptake of (18)F-L-FEHTP was determined in wild-type C57BL/6 mice by ex vivo biodistribution...
2016: F1000Research
https://www.readbyqxmd.com/read/27879249/glucosamine-induces-er-stress-by-disrupting-lipid-linked-oligosaccharide-biosynthesis-and-n-linked-protein-glycosylation
#16
Daniel R Beriault, Vi T Dang, Lexy H Zhong, Christina I Petlura, Cameron S McAlpine, Yuanyuan Shi, Geoff H Werstuck
Glucosamine is an essential substrate for N-linked protein glycosylation. However, elevated levels of glucosamine can induce endoplasmic reticulum (ER) stress. Glucosamine-induced ER stress has been implicated in the development of diabetic complications, including atherosclerosis and hepatic steatosis. In this study, we investigate the potential relationship between the effects of glucosamine on lipid-linked oligosaccharide (LLO) biosynthesis, N-linked glycosylation, and ER homeostasis. Mouse embryonic fibroblasts (MEFs) were cultured in the presence of 0-5 mM glucosamine for up to 18 h, and LLO biosynthesis was monitored by fluorescence-assisted carbohydrate electrophoresis...
January 1, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27872147/primary-human-and-rat-beta-cells-release-the-intracellular-autoantigens-gad65-ia-2-and-proinsulin-in-exosomes-together-with-cytokine-induced-enhancers-of-immunity
#17
Chiara Cianciaruso, Edward A Phelps, Miriella Pasquier, Romain Hamelin, Davide Demurtas, Mohamed Alibashe Ahmed, Lorenzo Piemonti, Sachiko Hirosue, Melody A Swartz, Michele De Palma, Jeffrey A Hubbell, Steinunn Baekkeskov
The target autoantigens in several organ-specific autoimmune diseases, including type 1 diabetes (T1D), are intracellular membrane proteins, whose initial encounter with the immune system is poorly understood. Here we propose a new model for how these proteins can initiate autoimmunity. We found that rat and human pancreatic islets release the intracellular β-cell autoantigens in human T1D, GAD65, IA-2 and proinsulin, in exosomes, which are taken up by and activate dendritic cells. Accordingly, anchoring of GAD65 to exosome-mimetic liposomes strongly boosted antigen presentation and T cell activation in the context of the human type 1 diabetes susceptibility haplotype HLA-DR4...
November 21, 2016: Diabetes
https://www.readbyqxmd.com/read/27871808/new-mechanism-of-lipotoxicity-in-diabetic-cardiomyopathy-deficiency-of-endogenous-h2s-production-and-er-stress
#18
Runmin Guo, Zijun Wu, Jiamei Jiang, Chang Liu, Bin Wu, Xingyue Li, Teng Li, Hailiang Mo, Songjian He, Shanghai Li, Hai Yan, Ruina Huang, Qiong You, Keng Wu
OBJECTIVE: To investigate the roles and mechanisms of endogenous hydrogen sulfide (H2S) and endoplasmic reticulum (ER) stress in the development of diabetic cardiomyopathy (DCM). METHODS: Blood of DCM patients included in the study were collected. The model of DCM rats was established using streptozotocin (STZ) injection. Cardiac lipotoxicity in vitro models were established using 500μM palmitic acid (PA) treatment for 24h in AC16 cardiomyocytes. Endogenous H2S production in plasma, culture supernatant and heart was measured by sulphur ion-selective electrode assay...
November 18, 2016: Mechanisms of Ageing and Development
https://www.readbyqxmd.com/read/27859785/increased-monocyte-derived-reactive-oxygen-species-in-type-2-diabetes-role-of-endoplasmic-reticulum-stress
#19
Robert M Restaino, Shekhar H Deo, Alan R Parrish, Paul J Fadel, Jaume Padilla
Recent evidence suggests that exposure of human monocytes to glucolipotoxic media to mimic the composition of plasma of patients with type 2 diabetes (T2D) results in the induction of endoplasmic reticulum stress markers and formation of reactive oxygen species (ROS). The extent to which these findings translate to patients with T2D remains unclear. Thus, we first measured ROS (dihydroethidium fluorescence) in peripheral blood mononuclear cells (PBMCs) from whole blood of T2D patients (n = 8) and compared to age matched healthy controls (n = 8)...
November 18, 2016: Experimental Physiology
https://www.readbyqxmd.com/read/27856609/ppar%C3%AE-is-required-for-exercise-to-attenuate-endoplasmic-reticulum-stress-and-endothelial-dysfunction-in-diabetic-mice
#20
Wai San Cheang, Wing Tak Wong, Lei Zhao, Jian Xu, Li Wang, Chi Wai Lau, Zhen Yu Chen, Ronald Ching Wan Ma, Aimin Xu, Nanping Wang, Xiao Yu Tian, Yu Huang
Physical activity has profound benefits on health especially cardiometablic wellness. Experiments on rodents with trained exercise showed that exercise improves vascular function and reduces vascular inflammation by modulating the balance between nitric oxide (NO) and oxidative stress. However, it is unclear what is the upstream regulator of exercise-induced vascular benefits. We aim to investigate the involvement of peroxisome proliferator-activated receptor δ (PPARδ) in exercise-induced vascular functional improvement...
November 17, 2016: Diabetes
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