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Stress induced hyperglycemia

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https://www.readbyqxmd.com/read/28105734/calcium-calmodulin-dependent-protein-kinase-mediates-the-intracellular-signaling-pathways-of-cardiac-apoptosis-in-mice-with-impaired-glucose-tolerance
#1
Marilen Federico, Enrique L Portiansky, Leandro Sommese, Francisco J Alvarado, Paula G Blanco, Carolina N Zanuzzi, John Dedman, Marcia Kaetzel, Xander H T Wehrens, Alicia Mattiazzi, Julieta Palomeque
Background The impact of cardiac apoptosis in pre-diabetic stages of diabetic cardiomyopathy is unknown. We described that myocytes from fructose-rich diet (FRD) animals exhibit arrhythmias produced by exacerbated Ca(2+) /calmodulin-protein kinase (CaMKII) activity, ryanodine receptors (RyR2) phosphorylation and sarcoplasmic reticulum (SR) Ca(2+) leak. We tested the hypothesis that this mechanism also underlies cardiac apoptosis in pre-diabetes. Methods and Results We generated a pre-diabetic model in mice fed with FRD...
January 20, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28101570/inhibition-of-tlr4-protects-rat-islets-against-lipopolysaccharide-induced-dysfunction
#2
Xiao Wang, Qin Min Ge, Fan Bian, Yan Dong, Chun Mei Huang
Oxidative stress leads to dysfunction in pancreatic cells, causing a reduction in insulin secretion following exposure to glucose. Toll-like receptor 4 (TLR4) may be activated by exposure to lipopolysaccharide (LPS) stress. TLR4 may mediate the initiation of inflammatory and immune defense responses; however, the importance of the LPS/TLR4 interaction in apoptosis induced by oxidative stress in pancreatic β cells remains to be elucidated. The present study aimed to investigate the importance of TLR4 during LPS‑induced oxidative stress, apoptosis and dysfunction of insulin secretion in isolated islets of rats...
February 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28098910/hydrogen-rich-saline-improves-non%C3%A2-alcoholic-fatty-liver-disease-by-alleviating-oxidative-stress-and-activating-hepatic-ppar%C3%AE-and-ppar%C3%AE
#3
Xiao Zhai, Xiao Chen, Jiancan Lu, Yaping Zhang, Xuejun Sun, Qin Huang, Qijin Wang
Non-alcoholic fatty liver disease (NAFLD) comprises a range of liver diseases, between steatosis and non‑alcoholic steatohepatitis and liver cirrhosis, which are closely associated with diabetes mellitus. Previous studies have indicated that oxidative stress is a key factor in the development of NAFLD. Molecular hydrogen (H2) may ameliorate oxidative stress injuries by selectively neutralizing peroxynitrite and hydroxyl radicals. The present study evaluated the effects of H2 on NAFLD in rats and concluded that H2‑rich saline had significant therapeutic effects on NAFLD induced by hyperglycemia and hyperlipidemia, as demonstrated by hematoxylin and eosin and terminal deoxynucleotidyl-transferase‑mediated dUTP nick end labeling staining...
January 13, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28098811/aspalathin-protects-the-heart-against-hyperglycemia-induced-oxidative-damage-by-up-regulating-nrf2-expression
#4
Phiwayinkosi V Dludla, Christo J F Muller, Elizabeth Joubert, Johan Louw, M Faadiel Essop, Kwazi B Gabuza, Samira Ghoor, Barbara Huisamen, Rabia Johnson
Aspalathin (ASP) can protect H9c2 cardiomyocytes against high glucose (HG)-induced shifts in myocardial substrate preference, oxidative stress, and apoptosis. The protective mechanism of ASP remains unknown. However, as one of possible, it is well known that phytochemical flavonoids reduce oxidative stress via nuclear factor (erythroid-derived 2)-like 2 (Nrf2) activation resulting in up-regulation of antioxidant genes and enzymes. Therefore, we hypothesized that ASP protects the myocardium against HG- and hyperglycemia-induced oxidative damage by up-regulating Nrf2 expression in H9c2 cardiomyocytes and diabetic (db/db) mice, respectively...
January 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28092845/cinnamaldehyde-potentially-attenuates-gestational-hyperglycemia-in-rats-through-modulation-of-ppar%C3%AE-proinflammatory-cytokines-and-oxidative-stress
#5
Ahmed A Hosni, A Adel Abdel-Moneim, Eman S Abdel-Reheim, Samah M Mohamed, Hamdi Helmy
Cinnamon has a history of use for medicinal purposes and its major benefits have been linked to cinnamaldehyde. The present study aimed to investigate the hypoglycemic action of cinnamaldehyde against fatty-sucrosed diet/streptozotocin (FSD/STZ)-rat model of gestational diabetes. Female albino rats were divided into three groups. Group I fed with normal diet (ND) while group II and III were fed with FSD for eight weeks (five weeks pre-gestational and three weeks gestational). Rats of group III were administered with a daily oral dose of 20mg/kg cinnamaldehyde one week before mating onward...
January 13, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28089808/stress-induced-hyperglycemia-after-spontaneous-subarachnoid-hemorrhage-and-its-role-in-predicting-cerebrospinal-fluid-diversion
#6
Bappaditya Ray, Ayumi Ludwig, Lori K Yearout, David M Thompson, Bradley N Bohnstedt
BACKGROUND: Stress induced hyperglycemia (SIH) after acute cerebrovascular disease is common and is associated with adverse clinical outcomes. Incidence of SIH after spontaneous subarachnoid hemorrhage (SAH) and its role in shunt placement has not been systematically investigated. Present study is designed to investigate the incidence of SIH after spontaneous SAH and its determinants. Role of SIH and premorbid hyperglycemia (using glycated hemoglobin, HbA1c) in predicting external ventricular drainage (EVD) and ventriculoperitoneal shunt (VPS) placement is also investigated...
January 12, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28089708/hair-corticosterone-measurement-in-mouse-models-of-type-1-and-type-2-diabetes-mellitus
#7
Rebecca L Erickson, Caroline A Browne, Irwin Lucki
In diabetes, glucocorticoid secretion increases secondary to hyperglycemia and is associated with an extensive list of disease complications. Levels of cortisol in humans, or corticosterone in rodents, are usually measured as transitory biomarkers of stress in blood or saliva. Glucocorticoid concentrations accumulate in human or animal hair over weeks and could more accurately measure the cumulative stress burden of diseases like chronic diabetes. In this study, corticosterone levels were measured in hair in verified rodent models of diabetes mellitus...
January 12, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28089584/pterostilbene-attenuates-high-glucose-induced-oxidative-injury-in-hippocampal-neuronal-cells-by-activating-nuclear-factor-erythroid-2-related-factor-2
#8
Yang Yang, Chongxi Fan, Bodong Wang, Zhiqiang Ma, Dongjin Wang, Bing Gong, Shouyin Di, Shuai Jiang, Yue Li, Tian Li, Zhi Yang, Erping Luo
In the present study, neuroblastoma (SH-SY5Y) cells were used to investigate the mechanisms mediating the potential protective effects of pterostilbene (PTE) against mitochondrial metabolic impairment and oxidative stress induced by hyperglycemia for mimicking the diabetic encephalopathy. High glucose medium (100 mM) decreased cellular viability after 24 h incubation which was evidenced by: (i) reduced mitochondrial complex I and III activities; (ii) reduced mitochondrial cytochrome C; (iii) increased reactive oxygen species (ROS) generation; (iv) decreased mitochondrial membrane potential (ΔΨm); and (v) increased lactate dehydrogenase (LDH) levels...
January 9, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28065730/potential-of-cecl3-msio2-nanoparticles-in-alleviating-diabetic-cataract-development-and-progression
#9
Jin Yang, Xiaoqun Gong, Lei Fang, Qi Fan, Lei Cai, Xiaodi Qiu, Bo Zhang, Jin Chang, Yi Lu
Cataract is a major cause of visual impairment for diabetic patients. It is imperative to develop efficient therapeutic agents against diabetic cataract (DC) because diabetes confers higher risk for complications after cataract surgery. We have previously reported the role of CeCl3 loaded mesoporous silica (CeCl3@mSiO2) nanoparticles in reducing the oxidative stress of lens epithelial cells. However, the potential of CeCl3@mSiO2 in preventing diabetic cataract development remains unclear. In this study, we applied CeCl3@mSiO2 nanoparticles with a size of 87...
January 5, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28061433/lovastatin-upregulates-microrna-29b-to-reduce-oxidative-stress-in-rats-with-multiple-cardiovascular-risk-factors
#10
Fu Wang, Hui Ma, Wen-Jing Liang, Jing-Jing Yang, Xue-Qing Wang, Mei-Rong Shan, Yuan Chen, Min Jia, Ya-Ling Yin, Xue-Ying Sun, Jia-Ning Zhang, Qi-Sheng Peng, Yu-Guo Chen, Li-Ying Liu, Peng Li, Tao Guo, Shuang-Xi Wang
AIMS: Proteasome-linked oxidative stress is believed to cause endothelial dysfunction, an early event in cardiovascular diseases (CVD). Statin, as HMG-CoA reductase inhibitor, prevents endothelial dysfunction in CVD. However, the molecular mechanism of statin-mediated normalization of endothelial function is not completely elucidated. METHODS AND RESULTS: Lovastatin time/dose-dependently increased miR-29b expression and decreased proteasome activity in cultured human umbilical vein endothelial cells (HUVECs)...
January 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/28056419/chamomile-matricaria-recutita-l-decoction-extract-inhibits-in-vitro-intestinal-glucose-absorption-and-attenuates-high-fat-diet-induced-lipotoxicity-and-oxidative-stress
#11
Mohamed-Amine Jabri, Mohsen Sakly, Lamjed Marzouki, Hichem Sebai
The present study aimed to investigate the inhibitory effect of chamomile decoction extract (CDE) on intestinal glucose absorption as well as its protective role against high fat diet (HFD)-induced obesity and lipotoxicity in rats. We used the Ussing chamber system to investigate the effect of CDE on intestinal transport of glucose. Male Wistar rats were fed HFD for six weeks to provoke obesity. CDE (100mg/kg, b.w. p.o.) has been per orally administered to HFD fed rats. Ex vivo, we found that CDE significantly and dose-dependently increased intestinal absorption of glucose...
January 2, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28042546/tempol-effect-on-epithelial-mesenchymal-transition-induced-by-hyperglycemia
#12
Mohammad Jafari, Farahnaz Dadras, Hamid Reza Ghadimipour, Mohamad Ali Seif Rabiei, Farhad Khoshjou
BACKGROUND: One of common mechanisms in pathophysiology of chronic kidney diseases is epithelial-mesenchymal transition (EMT). On the other hand oxidative stress has been known to participate in kidney damage of diabetic nephropathy (DN). OBJECTIVES: We studied if tempol, a well-known antioxidant agent, can ameliorate EMT in DN induced in male rats. MATERIALS AND METHODS: Twenty-seven male rats were equally divided in to 4 groups. Group I (control or C), group II (diabetic or D), group III (T) rats which was given tempol (100 mg/kg/day) by gavages for 28 days and group IV (D&T) was diabetic rats that also received same dose of tempol...
January 2017: Journal of Nephropathology
https://www.readbyqxmd.com/read/28030991/galangin-a-dietary-flavonoid-improves-antioxidant-status-and-reduces-hyperglycemia-mediated-oxidative-stress-in-streptozotocin-induced-diabetic-rats
#13
Amal A Aloud, Chinnadurai Veeramani, Chandramohan Govindasamy, Mohammed A Alsaif, Ahmed S El Newehy, Khalid S Al-Numair
OBJECTIVE: To examine the effect of galangin on hyperglycemia-mediated oxidative stress in streptozotocin (STZ)-induced diabetic rats. METHODS: Diabetes was induced by intraperitoneal administration of low-dose STZ (40 mg/kg body weight (BW)) into male albino Wistar rats. Galangin (8 mg/kg BW) or glibenclamide (600 µg/kg BW) was given orally, once daily for 45 days to normal and STZ-induced diabetic rats. RESULTS: Diabetic rats showed significantly increased levels of plasma glucose, thiobarbituric acid reactive substances, lipid hydroperoxides, and conjugated dienes...
December 28, 2016: Redox Report: Communications in Free Radical Research
https://www.readbyqxmd.com/read/28011166/hyperglycemia-and-high-nitric-oxide-level-induced-oxidative-stress-in-the-brain-and-molecular-alteration-in-the-neurons-and-glial-cells-of-laboratory-mouse-mus-musculus
#14
Rashmi Richa, Arun Kumar Yadawa, Chandra Mohini Chaturvedi
Chronic hyperglycemia (glucotoxicity) is reported to have detrimental effects on various brain functions leading to neurodegenerative changes. However, the effect of hyperglycemia in combination with high nitric oxide (NO) level (reported to be increased during glucotoxicity), on brain functions is not clear yet. The present study was designed to investigate the effects of hyperglycemic drug Streptozotocin (STZ) and NO donor Sodium nitroprusside (SNP) on the brain of laboratory mouse, Mus musculus. Effects of these conditions were studied on the markers of oxidative stress, NF-κB signalling and the markers of neuronal and glial cell activation/inflammation...
December 20, 2016: Neurochemistry International
https://www.readbyqxmd.com/read/28003360/downregulation-of-insulin-receptor-substrate-1-during-hyperglycemia-induces-vascular-smooth-muscle-cell-dedifferentiation
#15
Gang Xi, Christine Wai, Morris F White, David R Clemmons
Diabetes is a major risk factor for the development of atherosclerosis but the mechanism by which hyperglycemia accelerates lesion development is not well defined. Insulin and insulin like growth factor-I (IGF-I)1 signal through the scaffold protein insulin receptor substrate-1(IRS-1). In diabetes IRS-1 is down regulated and cells become resistant to insulin. Under these conditions the IGF-I receptor signals through an alternate scaffold protein, SHPS-1, resulting in pathophysiologic stimulation of vascular smooth muscle cell (VSMC) migration and proliferation...
December 21, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27998959/exogenous-h2s-regulates-endoplasmic-reticulum-mitochondria-cross-talk-to-inhibit-apoptotic-pathways-in-stz-induced-type-i-diabetes
#16
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/27989876/iridoid-glycoside-from-cornus-officinalis-ameliorated-diabetes-mellitus-induced-testicular-damage-in-male-rats-involvement-of-suppression-of-the-ages-rage-p38-mapk-signaling-pathway
#17
Yuping Chen, Yunhao Wu, Xiaoyang Gan, Kai Liu, L V Xing, Hongsheng Shen, Guoying Dai, Huiqin Xu
ETHNOPHARMACOLOGICAL RELEVANCE: Cornus officinalis (CO) has been widely used as a traditional Chinese medicine for treating diabetes mellitus (DM) and its complications. Iridoid glycoside from C. officinalis (IGCO) can resist apoptosis, hyperglycemia, oxidation and so on. The aim of this study was to investigate the therapeutic effects of IGCO on DM-induced testicular damage through inhibition of the AGEs/RAGE/p38 MAPK signaling pathway. MATERIALS AND METHODS: A DM model of male Wistar rats was induced with streptozotocin injection (30mg/kg, i...
October 27, 2016: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/27988841/so4-uptake-and-catalase-role-in-preconditioning-after-h2o2-induced-oxidative-stress-in-human-erythrocytes
#18
Rossana Morabito, Alessia Remigante, Maria Letizia Di Pietro, Antonino Giannetto, Giuseppina La Spada, Angela Marino
Preconditioning (PC) is an adaptive response to a mild and transient oxidative stress, shown for the first time in myocardial cells and not described in erythrocytes so far. The possible adaptation of human erythrocytes to hydrogen peroxide (H2O2)-induced oxidative stress has been here verified by monitoring one of band 3 protein functions, i.e., Cl(-)/HCO3(-) exchange, through rate constant for SO4(=) uptake measurement. With this aim, erythrocytes were exposed to a mild and transient oxidative stress (30 min to either 10 or 100 μM H2O2), followed by a stronger oxidant condition (300- or, alternatively, 600-μM H2O2 treatment)...
December 17, 2016: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/27981484/uric-acid-is-protective-after-cerebral-ischemia-reperfusion-in-hyperglycemic-mice
#19
Carles Justicia, Angélica Salas-Perdomo, Isabel Pérez-de-Puig, Lisette H Deddens, Geralda A F van Tilborg, Clara Castellví, Rick M Dijkhuizen, Ángel Chamorro, Anna M Planas
Hyperglycemia at stroke onset is associated with poor long-term clinical outcome in numerous studies. Hyperglycemia induces intracellular acidosis, lipid peroxidation, and peroxynitrite production resulting in the generation of oxidative and nitrosative stress in the ischemic tissue. Here, we studied the effects of acute hyperglycemia on in vivo intercellular adhesion molecule-1 (ICAM-1) expression, neutrophil recruitment, and brain damage after ischemia/reperfusion in mice and tested whether the natural antioxidant uric acid was protective...
December 15, 2016: Translational Stroke Research
https://www.readbyqxmd.com/read/27975068/quercetin-isolated-from-toona-sinensis-leaves-attenuates-hyperglycemia-and-protects-hepatocytes-in-high-carbohydrate-high-fat-diet-and-alloxan-induced-experimental-diabetic-mice
#20
Yali Zhang, Huanhuan Dong, Mimi Wang, Jingfang Zhang
The development of diabetes mellitus is related to oxidant stress induced by a high carbohydrate/high-fat diet (HFD). Quercetin, as a major bioactive component in Toona sinensis leaves (QTL), is a natural antioxidant. However, the exact mechanism by which QTL ameliorate diabetes mellitus is still unknown. In this study, we investigated the hypoglycemic effects and hepatocytes protection of QTL on HFD and alloxan induced diabetic mice. Intragastric administration of QTL significantly reduced body weight gain, serum glucose, insulin, total cholesterol, triglyceride, low density lipoprotein-cholesterol, alanine aminotransferase, and aspartate aminotransferase serum levels compared to those of diabetic mice...
2016: Journal of Diabetes Research
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