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er stress and diabetes

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https://www.readbyqxmd.com/read/29334763/long-non-coding-rna-linc01619-regulates-mir-27a-foxo1-and-endoplasmic-reticulum-stress-mediated-podocyte-injury-in-diabetic-nephropathy
#1
Xiaoyan Bai, Jian Geng, Xiao Li, Jiao Wan, Jixing Liu, Zhan Mei Zhou, Xiaoting Liu
AIMS: Altered activities of long non-coding RNAs (lncRNAs) have been implicated in the regulation of microRNAs. MicroRNA-27a (miR-27a) upregulation has been shown to induce endoplasmic reticulum stress (ER stress) and podocyte injury in diabetic nephropathy (DN). Herein, we aim to interrogate the mutually regulated network of miR-27a with long intergenic non-coding RNA 1619 (LINC01619) and the target gene. RESULTS: LINC01619 downregulation was found in human DN renal biopsy tissues and contributed to proteinuria and diminished renal function...
January 15, 2018: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/29329354/palmitate-induced-er-stress-and-inhibition-of-protein-synthesis-in-cultured-myotubes-does-not-require-toll-like-receptor-4
#2
Ben D Perry, Jill A Rahnert, Yang Xie, Bin Zheng, Myra E Woodworth-Hobbs, S Russ Price
Saturated fatty acids, such as palmitate, are elevated in metabolically dysfunctional conditions like type 2 diabetes mellitus. Palmitate has been shown to impair insulin sensitivity and suppress protein synthesis while upregulating proteolytic systems in skeletal muscle. Increased sarco/endoplasmic reticulum (ER) stress and subsequent activation of the unfolded protein response may contribute to the palmitate-induced impairment of muscle protein synthesis. In some cell types, ER stress occurs through activation of the Toll-like receptor 4 (TLR4)...
2018: PloS One
https://www.readbyqxmd.com/read/29317203/alpha-mangostin-attenuates-diabetic-nephropathy-in-association-with-suppression-of-acid-sphingomyelianse-and-endoplasmic-reticulum-stress
#3
Tingting Liu, Wang Duan, Paul Nizigiyimana, Lin Gao, Zhouning Liao, Boya Xu, Lerong Liu, Minxiang Lei
AIMS: Diabetic nephropathy is a common complication of diabetes, but there are currently few treatment options. The aim of this study was to gain insight into the effect of alpha-mangostin on diabetic nephropathy and possible related mechanisms. METHODS: Goto-Kakizaki rats were used as a diabetic model and received alpha-mangostin or desipramine treatment with normal saline as a control. Ten age-matched Sprague Dawley rats were used as normal controls and treated with normal saline...
January 6, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29305625/ifn-%C3%AE-induces-a-preferential-long-lasting-expression-of-mhc-class-i-in-human-pancreatic-beta-cells
#4
Alexandra Coomans de Brachène, Reinaldo S Dos Santos, Laura Marroqui, Maikel L Colli, Lorella Marselli, Raghavendra G Mirmira, Piero Marchetti, Decio L Eizirik
AIMS/HYPOTHESIS: IFN-α, a cytokine expressed in human islets from individuals affected by type 1 diabetes, plays a key role in the pathogenesis of diabetes by upregulating inflammation, endoplasmic reticulum (ER) stress and MHC class I overexpression, three hallmarks of islet histology in early type 1 diabetes. We tested whether expression of these mediators of beta cell loss is reversible upon IFN-α withdrawal or IFN-α pathway inhibition. METHODS: IFN-α-induced MHC class I overexpression, ER stress and inflammation were evaluated by flow cytometry, immunofluorescence and real-time PCR in human EndoC-βH1 cells or human islets exposed to IFN-α with or without the presence of Janus kinase (JAK) inhibitors...
January 5, 2018: Diabetologia
https://www.readbyqxmd.com/read/29304075/%C3%AE-cell-specific-overexpression-of-adiponectin-receptor-1-does-not-improve-diabetes-mellitus-in-akita-mice
#5
Jungmi Choi, Hatasu Kobayashi, Hiroko Okuda, Kouji H Harada, Midori Takeda, Hiroyuki Fujimoto, Shunsuke Yamane, Daisuke Tanaka, Shohab Youssefian, Nobuya Inagaki, Akio Koizumi
Adiponectin, a metabolically-active cytokine secreted from adipose tissue, is reported to have anti-apoptotic effects on β-cells as well as anti-hyperglycemic effects through adiponectin receptor signaling. However, the anti-apoptotic effects of adiponectin on β-cells have not been confirmed in established diabetic models, and the anti-hyperglycemic effects and their associated signal cascades remain controversial. To investigate the effects of adiponectin on β-cell protection and its down-stream signaling events, we have generated β-cell-specific rat insulin promoter (RIP)-AdipoR1 transgenic mice (AdipoR1 mice), in which the adiponectin receptor, AdipoR1, is overexpressed in β-cells in a manner synchronous with insulin demand...
2018: PloS One
https://www.readbyqxmd.com/read/29290500/palmitic-and-oleic-acid-the-yin-and-yang-of-fatty-acids-in-type-2-diabetes-mellitus
#6
REVIEW
Xavier Palomer, Javier Pizarro-Delgado, Emma Barroso, Manuel Vázquez-Carrera
Increased plasma non-esterified fatty acids (NEFAs) link obesity with insulin resistance and type 2 diabetes mellitus (T2DM). However, in contrast to the saturated FA (SFA) palmitic acid, the monounsaturated FA (MUFA) oleic acid elicits beneficial effects on insulin sensitivity, and the dietary palmitic acid:oleic acid ratio impacts diabetes risk in humans. Here we review recent mechanistic insights into the beneficial effects of oleic acid compared with palmitic acid on insulin resistance and T2DM, including its anti-inflammatory actions, and its capacity to inhibit endoplasmic reticulum (ER) stress, prevent attenuation of the insulin signaling pathway, and improve β cell survival...
December 28, 2017: Trends in Endocrinology and Metabolism: TEM
https://www.readbyqxmd.com/read/29288332/essential-role-for-egfr-tyrosine-kinase-and-er-stress-in-myocardial-infarction-in-type-2-diabetes
#7
Vishal Mali, Samuel Haddox, Corey Hornersmith, Khalid Matrougui, Souad Belmadani
We previously reported that EGFR tyrosine kinase (EGFRtk) activity and endoplasmic reticulum (ER) stress are enhanced in type 2 diabetic (T2D) mice and cause vascular dysfunction. In the present study, we determined the in vivo contribution of EGFRtk and ER stress in acute myocardial infarction induced by acute ischemia (40 min)-reperfusion (24 h) (I/R) injury in T2D (db-/db-) mice. We treated db-/db- mice with EGFRtk inhibitor (AG1478, 10 mg/kg/day) for 2 weeks. Mice were then subjected to myocardial I/R injury...
December 29, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/29277369/implication-of-altered-ubiquitin-proteasome-system-and-er-stress-in-the-muscle-atrophy-of-diabetic-rats
#8
S Sreenivasa Reddy, Karnam Shruthi, Y Konda Prabhakar, Gummadi Sailaja, G Bhanuprakash Reddy
BACKGROUND: Skeletal muscle is adversely affected in type-1 diabetes, and excessively stimulated ubiquitin-proteasome system (UPS) was found to be a leading cause of muscle wasting or atrophy. The role of endoplasmic reticulum (ER) stress in muscle atrophy of type-1 diabetes is not known. Hence, we investigated the role of UPS and ER stress in the muscle atrophy of chronic diabetes rat model. METHODS: Diabetes was induced with streptozotocin (STZ) in male Sprague-Dawley rats and were sacrificed 2- and 4-months thereafter to collect gastrocnemius muscle...
December 22, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29244751/spirulina-extract-enhanced-a-protective-effect-in-type-1-diabetes-by-anti-apoptosis-and-anti-ros-production
#9
Jiyeong Lee, Arum Park, Mi Jeong Kim, Hee-Joung Lim, Young-Ah Rha, Hee-Gyoo Kang
Interest in the nutritional value and pharmacological activities of blue-green algae has gradually increased. Spirulina extracts show protective effects against apoptosis and inflammatory damage in various cell types. Here, we investigated the protective effects of extracts from Spirulina maxima in a cytokine-mediated type 1 diabetes model in vitro and in streptozotocin-induced diabetic Wistar rats in vivo. Interleukin-1β and interferon-gamma induced substantial cytotoxicity to RINm5F rat insulinoma cells, increasing nitric oxide (NO) production, nuclear factor-kappa B (NF-κB) activity, the expression of endoplasmic reticulum (ER) stress genes, and activation of mitogen-activated protein kinases and key genes related apoptosis...
December 15, 2017: Nutrients
https://www.readbyqxmd.com/read/29233968/hrd1-prevents-apoptosis-in-renal-tubular-epithelial-cells-by-mediating-eif2%C3%AE-ubiquitylation-and-degradation
#10
Yujie Huang, Yifei Sun, Yizhi Cao, Hui Sun, Min Li, Hui You, Dongming Su, Yanjiao Li, Xiubin Liang
Apoptosis of renal tubular epithelial cells is a key feature of the pathogenicity associated with tubulointerstitial fibrosis and other kidney diseases. One factor that regulates important cellular processes like apoptosis and cell proliferation is HRD1, an E3 ubiquitin ligase that acts by promoting ubiquitylation and degradation of its target protein. However, the detailed mechanisms by which HRD1 acts as a regulator of apoptosis in renal tubular epithelial cells have not been established. In our previous liquid chromatography-tandem mass spectrometry (LC-MS/MS) study (Mol Endocrinol...
December 11, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/29229738/hdac5-integrates-er-stress-and-fasting-signals-to-regulate-hepatic-fatty-acid-oxidation
#11
Xinchen Qiu, Jian Li, Sihan Lv, Jiamin Yu, Junkun Jiang, Jindong Yao, Yang Xiao, Bingxin Xu, Haiyan He, Fangfei Guo, Zhen-Ning Zhang, Chao Zhang, Bing Luan
Disregulation of fatty acid oxidation, one of the major mechanisms to maintain hepatic lipid homeostasis under fasting conditions, leads to hepatic steatosis. Although obesity and type 2 diabetes-induced ER stress contributes to hepatic steatosis, it is largely unknown how ER stress regulates fatty acid oxidation. Here we show that fasting glucagon stimulates the dephosphorylation and nuclear translocation of HDAC5, where it interacts with PPARα and promotes transcriptional activity of PPARα. As a result, overexpression of HDAC5 but not PPARα binding-deficient HDAC5 in liver improves lipid homeostasis, while RNAi-mediated knockdown of HDAC5 deteriorates hepatic steatosis...
December 11, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/29225119/d-chiro-inositol-enriched-fagopyrum-tataricum-l-gaench-extract-alleviates-mitochondrial-malfunction-and-inhibits-er-stress-jnk-associated-inflammation-in-the-endothelium
#12
Bobo Zhang, Caifeng Gao, Yunlong Li, Min Wang
ETHNOPHARMACOLOGICAL RELEVANCE: Tartary buckwheat is a food medicine dual-use crop with healing effects on cardiovascular diseases and type2 diabetes. It has been proposed that endothelial dysfunction is the initial lesion in these diseases and it's associated with mitochondrial dysfunction, endoplasmic reticulum (ER) stress and inflammation. D-chiro-inositol (DCI) is a bioactive compound of Tartary buckwheat and is always deficit in type2 diabetes. However, it remains unknown whether DCI-enriched Tartary buckwheat extract can ameliorate mitochondrial dysfunction, ER stress and inflammation in the endothelium...
December 7, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29224104/the-role-of-estrogens-in-pancreatic-islet-physiopathology
#13
Franck Mauvais-Jarvis, Cedric Le May, Joseph P Tiano, Suhuan Liu, Gamze Kilic-Berkmen, Jun Ho Kim
In rodent models of insulin-deficient diabetes, 17β-estradiol (E2) protects pancreatic insulin-producing β-cells against oxidative stress, amyloid polypeptide toxicity, gluco-lipotoxicity, and apoptosis. Three estrogen receptors (ERs)-ERα, ERβ, and the G protein-coupled ER (GPER)-have been identified in rodent and human β-cells. This chapter describes recent advances in our understanding of the role of ERs in islet β-cell function, nutrient homeostasis, survival from pro-apoptotic stimuli, and proliferation...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29221422/total-flavones-of-abelmoschus-manihot-improve-diabetic-nephropathy-by-inhibiting-the-irhom2-tace-signalling-pathway-activity-in-rats
#14
Su Liu, Lifang Ye, Jing Tao, Chao Ge, Liji Huang, Jiangyi Yu
CONTEXT: Total flavones extracted from Abelmoschus manihot L. (Malvaceae) medic (TFA) have been proven clinically effective at improving renal inflammation and glomerular injury in chronic kidney disease (CKD). OBJECTIVE: This study evaluated the function of TFA as an inhibitor of iRhom2/TACE (tumour necrosis factor-α converting enzyme) signalling and investigated its anti-DN (diabetic nephropathy) effects in a DN rat model. MATERIALS AND METHODS: In vitro, cells were treated with 200 μg/mL advanced glycation end products (AGEs), and then co-cultured with 20 μg/mL TFA for 24 h...
December 2017: Pharmaceutical Biology
https://www.readbyqxmd.com/read/29213335/liraglutide-attenuates-atherosclerosis-via-inhibiting-er-induced-macrophage-derived-microvesicles-production-in-t2dm-rats
#15
Jinjin Li, Xiaojuan Liu, Qianhua Fang, Min Ding, Chunjun Li
Background: We investigated the effects of liraglutide on the formation and progression of atherosclerosis in type 2 diabetes mellitus (T2DM) rats. Methods: Sprague-Dawley rats were divided into control group, diabetes group and liraglutide treated group. The T2DM rats model with atherosclerosis were induced by high fat diet followed small dosage streptozotocin injection. Body weight and blood glucose levels were monitored once a week for 3 months and then the rats were sacrificed...
2017: Diabetology & Metabolic Syndrome
https://www.readbyqxmd.com/read/29212786/endoplasmic%C3%A2-reticulum%C3%A2-stress-autophagy%C3%A2-pathway%C3%A2-is%C3%A2-involved%C3%A2-in-diabetes-induced-neuronal%C3%A2-apoptosis%C3%A2-and-cognitive%C3%A2-decline%C3%A2-in%C3%A2-mice
#16
Fei-Juan Kong, Lei-Lei Ma, Jun-Jie Guo, Lin-Hao Xu, Yun Li, Shen Qu
Diabetes mellitus is a significant global public health problem depicting a rising prevalence worldwide. As a serious complication of diabetes, diabetes-associated cognitive decline is attracting increasing attention. However, the underlying mechanisms are yet to be fully determined. Both endoplasmic reticulum (ER) stress and autophagy have been reported to modulate neuronal survival and death and be associated with several neurodegenerative diseases...
December 6, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/29203573/mechanisms-of-%C3%AE-cell-dedifferentiation-in-diabetes-recent-findings-and-future-research-directions
#17
Mohammed Bensellam, Jean-Christophe Jonas, D Ross Laybutt
Like all the cells of an organism, pancreatic β-cells originate from embryonic stem cells through a complex cellular process termed differentiation. Differentiation involves the coordinated and tightly controlled activation/repression of specific effectors and gene clusters in a time-dependent fashion thereby giving rise to particular morphological and functional cellular features. Interestingly, cellular differentiation is not a unidirectional process. Indeed, growing evidence suggests that under certain conditions, mature β-cells can lose, to various degrees, their differentiated phenotype and cellular identity and regress to a less differentiated or a precursor-like state...
December 4, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/29203148/diabetic-retinopathy-pathogenesis-and-the-ameliorating-effects-of-melatonin-involvement-of-autophagy-inflammation-and-oxidative-stress
#18
REVIEW
Ehsan Dehdashtian, Saeed Mehrzadi, Bahman Yousefi, Azam Hosseinzadeh, Russel J Reiter, Majid Safa, Habib Ghaznavi, Masood Naseripour
Diabetic retinopathy (DR), a microvascular complication of diabetes mellitus (DM), remains as one of the major causes of vision loss worldwide. The release of pro-inflammatory cytokines and the adhesion of leukocytes to retinal capillaries are initial events in DR development. Inflammation, ER stress, oxidative stress and autophagy are major causative factors involved in the pathogenesis of DR. Diabetes associated hyperglycemia leads to mitochondrial electron transport chain dysfunction culminating in a rise in ROS generation...
December 1, 2017: Life Sciences
https://www.readbyqxmd.com/read/29197144/protein-folding-by-water-soluble-cyclic-diselenides-with-novel-oxidoreductase-and-isomerase-activities
#19
Kenta Arai, Haruhito Ueno, Yuki Asano, Gaurango Chakrabarty, Shingo Shimodaira, Govindasamy Mugesh, Michio Iwaoka
Protein disulfide isomerase (PDI) family, present in the endoplasmic reticulum (ER) of mammalian cells, catalyzes the formation and cleavage of disulfide bonds and thereby helps in protein folding. A decrease in PDI activity under ER stress conditions lead to protein misfolding, which is responsible for the progression of various human diseases, such as Alzheimers, Parkinsons, diabetes mellitus and atherosclerosis. In this paper, we report that water-soluble cyclic diselenides mimic the multifunctional activity of PDI family by facilitating oxidative folding, disulfide formation/reduction and repair of the scrambled disulfide bonds in misfolded proteins...
December 2, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/29180572/the-atpase-activity-of-asna1-trc40-is-required-for-pancreatic-progenitor-cell-survival
#20
Stefan Norlin, Vishal Parekh, Helena Edlund
Asna1, also known as TRC40, is implicated in delivery of tail anchored (TA) proteins into the ER, in vesicle-mediated transport, and in chaperoning unfolded proteins during oxidative stress/ATP depletion. We recently showed that Asna1 inactivation in β-cells resulted in impaired retrograde transport, ER stress and diabetes in mice. Here we show that Asna1 inactivation in pancreatic progenitor cells leads to redistribution of the Golgi TA SNAREs Syntaxin-5 and Syntaxin-6, Golgi fragmentation, and accumulation of cytosolic p62+ puncta...
November 27, 2017: Development
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