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Akt/PKB heart

Hui Li, Yiqing Mao, Qun Zhang, Qing Han, Zhenming Man, Jingyu Zhang, Xi Wang, Ruobi Hu, Xuehui Zhang, David M Irwin, Gang Niu, Huanran Tan
ETHNOPHARMACOLOGICAL RELEVANCE: Using insects, such as the cockroach, for the treatment of disease has a long history in traditional Chinese medicine. Xinmailong (XML) Injection, a bioactive composite extracted from Periplaneta americana (a species of cockroach), shows reasonable protective effects against cardiovascular injury and was approved for the use in the treatment of cardiac dysfunction in 2006, yet its cardio protective mechanisms remain unclear. AIM: The present study aims to examine the protective effects of XML against epirubicin-induced cardiotoxicity in vivo and determine its underlying mechanisms...
November 4, 2016: Journal of Ethnopharmacology
Qianqian Liang, Baoyu Wang, Lingxia Pang, Youpei Wang, Meiqin Zheng, Qing Wang, Jingbin Yan, Jinzhong Xu
OBJECTIVES: Higher cellular reactive oxygen species (ROS) levels is important in reducing cellular energy charge (EC) by increasing the levels of key metabolic protein, and nitrosative modifications, and have been shown to damage the cardiac tissue of diabetic mice. However, the relation between energy production and heart function is unclear. MATERIALS AND METHODS: Streptozotocin (STZ, 150 mg/kg body weight) was injected intraperitoneally once to mice that had been fasted overnight for induction of diabetes...
January 2016: Iranian Journal of Basic Medical Sciences
Yun-tai Yao, Ding-hua Liu, Li-huan Li
OBJECTIVE: To examine whether the combination of anesthetic preconditioning and anesthetic postconditioning could elicit additional cardio-protection as compared to either anesthetic preconditioning or anesthetic postconditioning alone and its underlying mechanism. METHODS: Isolated rat hearts were randomized into one of four groups: CTRL group (30 min of ischemia followed by 120 min of reperfusion alone); SpreC group (3% sevoflurane preconditioning was administered for 15 min followed by 10 min of washout before ischemia); SpostC group (3% sevoflurane postconditioning was administered during the first 15 min of reperfusion after ischemia); SpreC+SpostC group (the protocols of SpreC and SpostC were combined)...
March 2016: Perfusion
Amy E Mendham, Rob Duffield, Aaron J Coutts, Frank Marino, Andriy Boyko, David J Bishop
INTRODUCTION: The present study investigated whether rugby small-sided games (SSG) could be an effective alternative to continuous stationary cycling (CYC) training at reducing clinical risk factors associated with the development of type 2 diabetes mellitus (T2DM). METHODS: Thirty-three middle-aged (48.6±6.6y), inactive men were randomized into a CYC (n=11), SSG (n=11), or control (CON, n=11) group. Participants trained 3d·wk(-1) for 8 weeks, while control participants maintained normal activity and dietary patterns...
2015: PloS One
Mei Peng, Xiaoping Yang
Diabetes, particularly type II diabetes, is a severe disease condition which affects human health worldwide, with a dramatically increasing trend in Asian countries including China. Currently, no efficient drugs other than those with observable side effects are available. Chromium complexes, with the most known representative chromium picolinate, have been listed as one of most attractive health supplements to attenuate this disease condition in western countries. Recent efforts have been made to develop new chromium complexes with novel ligands...
May 2015: Journal of Inorganic Biochemistry
X-J Qian, X-L Li, X Xu, X Wang, Q-T Feng, C-J Yang
The phosphoinositide-3 kinase (PI3K) - phosphoinositide-dependent protein kinase 1 (PDK1)-Akt/protein kinase B (PKB) cascade plays a critical role in cardiovascular development and tumor genesis. But the role of PDK1 in the microenvironment of heart and tumor remains unknown. To clarify the effects of PDK1 on tissue microenvironment in vivo, here, we created α-SMA-Cre-mediated excision of PDK1 mice. And the mice were injected subcutaneously with Lewis lung carcinoma (LLC) cells. We found PDK1-deficient mice had post-natal praecox dilated cardiomyopathy, decelerated tumor growth and severe tumor metastasis...
April 2015: Pathologie-biologie
Sang-Bing Ong, Andrew R Hall, Rachel K Dongworth, Siavash Kalkhoran, Aswin Pyakurel, Luca Scorrano, Derek J Hausenloy
The mechanism through which the protein kinase Akt (also called PKB), protects the heart against acute ischaemia-reperfusion injury (IRI) is not clear. Here, we investigate whether Akt mediates its cardioprotective effect by modulating mitochondrial morphology. Transfection of HL-1 cardiac cells with constitutively active Akt (caAkt) changed mitochondrial morphology as evidenced by an increase in the proportion of cells displaying predominantly elongated mitochondria (73 ± 5.0 % caAkt vs 49 ± 5.8 % control: N=80 cells/group; p< 0...
March 2015: Thrombosis and Haemostasis
Ruduwaan Salie, Barbara Huisamen, Amanda Lochner
BACKGROUND: Although obesity is still considered a risk factor in the development of cardiovascular disorders, recent studies suggested that it may also be associated with reduced morbidity and mortality, the so-called "obesity paradox". Experimental data on the impact of diabetes, obesity and insulin resistance on myocardial ischaemia/reperfusion injury are controversial. Similar conflicting data have been reported regarding the effects of ischaemic preconditioning on ischaemia/reperfusion injury in hearts from such animals...
2014: Cardiovascular Diabetology
Frederic Nduhirabandi, Barbara Huisamen, Hans Strijdom, Dee Blackhurst, Amanda Lochner
Chronic melatonin treatment has been shown to prevent the harmful effects of diet-induced obesity and reduce myocardial susceptibility to ischaemia-reperfusion injury (IRI). However, the exact mechanism whereby it exerts its beneficial actions on the heart in obesity/insulin resistance remains unknown. Herein, we investigated the effects of relatively short-term melatonin treatment on the heart in a rat model of diet-induced obesity. Control and diet-induced obese Wistar rats (fed a high calorie diet for 20 wk) were each subdivided into three groups receiving drinking water with or without melatonin (4 mg/kg/day) for the last 6 or 3 wk of experimentation...
October 2014: Journal of Pineal Research
Yunshan Cao, Lichan Tao, Shutong Shen, Junjie Xiao, Hang Wu, Beibei Li, Xiangqi Wu, Wen Luo, Qi Xiao, Xiaoshan Hu, Hailang Liu, Junwei Nie, Shuangshuang Lu, Baiyin Yuan, Zhonglin Han, Bo Xiao, Zhongzhou Yang, Xinli Li
Ras homologue enriched in brain 1 (Rheb1) plays an important role in a variety of cellular processes. In this study, we investigate the role of Rheb1 in the post-natal heart. We found that deletion of the gene responsible for production of Rheb1 from cardiomyocytes of post-natal mice resulted in malignant arrhythmias, heart failure, and premature death of these mice. In addition, heart growth impairment, aberrant metabolism relative gene expression, and increased cardiomyocyte apoptosis were observed in Rheb1-knockout mice prior to the development of heart failure and arrhythmias...
2013: International Journal of Molecular Sciences
Vikram Prasad, John N Lorenz, Marian L Miller, Kanimozhi Vairamani, Michelle L Nieman, Yigang Wang, Gary E Shull
Acute inhibition of the NHE1 Na(+)/H(+) exchanger protects against ischemia-reperfusion injury and chronic inhibition attenuates development of cardiac hypertrophy and failure. To determine the cardiac effects of chronic inhibition of NHE1 under non-pathological conditions we used NHE1-null mice as a model of long-term NHE1 inhibition. Cardiovascular performance was relatively normal in Nhe1(-/-) mice although cardiac contractility and relaxation were slightly improved in mutant mice of the FVB/N background...
December 2013: Journal of Molecular and Cellular Cardiology
Tanner M Fullmer, Shaobo Pei, Yi Zhu, Crystal Sloan, Robert Manzanares, Brandon Henrie, Karla M Pires, James E Cox, E Dale Abel, Sihem Boudina
It is believed that the diabetic myocardium is refractory to cardioprotection by ischemic preconditioning (IPC) mainly because of impaired insulin signaling to phosphatidylinositol 3-kinase (PI3K) and protein kinase B (PKB or Akt). However, human as well as animal studies have clearly showed that the hearts of type 2 diabetic humans and animals may exhibit increased signaling through PI3K-Akt but yet are resistant to cardioprotection by IPC or ischemic post-conditioning. Therefore, this study was designed to determine whether activation of insulin signaling prior to IPC is detrimental for cardioprotection and to assess the role of insulin receptors (IRs) and Akt in mediating this effect...
November 2013: Journal of Molecular and Cellular Cardiology
Guo-guang Wang, Wei Li, Xiao-hua Lu, Xue Zhao, Lei Xu
AIM: To investigate cardioprotective effect of taurine in diabetic rats. METHODS: Male Sprague-Dawley rats were assigned randomly into four groups of 15 rats: control group, control+taurine group, streptozotocin (STZ) group, and STZ + taurine group. Rats in STZ and STZ+ taurine groups were treated by a single injection of STZ (70 mg kg-1, intraperitoneally) dissolved in 0.01 M citrate buffer (pH 4.5) for induction of diabetes, and rats in control and control+taurine groups were treated with the same volume citrate buffer...
April 2013: Croatian Medical Journal
B Huisamen, C George, D Dietrich, S Genade
AIM: Obesity and type 2 diabetes present with two debilitating complications, namely, hypertension and heart disease. The dried and ground pods of Prosopis glandulosa (commonly known as the Honey mesquite tree) which is part of the Fabaceae (or legume) family are currently marketed in South Africa as a food supplement with blood glucose-stabilising and anti-hypertensive properties. We previously determined its hypoglycaemic effects, and in the current study we determined the efficacy of P glandulosa as anti-hypertensive agent and its myocardial protective ability...
March 2013: Cardiovascular Journal of Africa
Bénédicte Demeulder, Elham Zarrinpashneh, Audrey Ginion, Benoit Viollet, Louis Hue, Mark H Rider, Jean-Louis Vanoverschelde, Christophe Beauloye, Sandrine Horman, Luc Bertrand
Eukaryotic elongation factor 2 (eEF-2) and mammalian target of rapamycin (mTOR)-p70 ribosomal protein S6 kinase (p70S6K) signaling pathways control protein synthesis and are inhibited during myocardial ischemia. Intracellular acidosis and AMP-activated protein kinase (AMPK) activation, both occurring during ischemia, have been proposed to participate in this inhibition. We evaluated the contribution of AMPKα2, the main cardiac AMPK catalytic subunit isoform, in eEF2 and mTOR-p70S6K regulation using AMPKα2 KO mice...
June 2013: Biochimica et Biophysica Acta
Bao-shan Li, Hou-xun Ma, Yan-jiao Wang, Ping Wu
OBJECTIVE: To assess the effect of Klotho gene transduction on the progression of hypertension and heart damage in spontaneous hypertensive rats (SHRs). METHODS: An adeno-associated virus (AAV) carrying full-length mouse Klotho cDNA (rAAV.mKL) was constructed for in vivo expression of Klotho. Three different groups of male SHRs and a control group of sex and age-matched Sprague Dawley (SD) rats (5 rats per group) were used. The experimental groups of SHRs received an IV injection of phosphate buffered saline (PBS), rAAV...
December 2012: Zhonghua Yi Xue Yi Chuan Xue za Zhi, Zhonghua Yixue Yichuanxue Zazhi, Chinese Journal of Medical Genetics
Bing Sun, Jing Xiao, Xiao-Bo Sun, Ying Wu
BACKGROUND AND PURPOSE: Notoginsenoside R1 (NG-R1), a novel phytoestrogen isolated from Panax notoginseng, is believed to have anti-inflammatory, anti-oxidative and anti-apoptotic properties. However, its cardioprotective properties and underlying mechanisms are largely unknown. Here we have assessed the contribution of the anti-inflammatory effects of NG-R1 to the amelioration of septic cardiac dysfunction and inflammation in mice. EXPERIMENTAL APPROACH: We assessed cardiac function in mice by echocardiography...
April 2013: British Journal of Pharmacology
Daniel Donner, John P Headrick, Jason N Peart, Eugene F du Toit
Obesity with associated metabolic disturbances worsens ischaemic heart disease outcomes, and rodent studies confirm that obesity with insulin-resistance impairs myocardial resistance to ischemia-reperfusion (I-R) injury. However, the effects of obesity per se are unclear, with some evidence for paradoxic cardioprotection (particularly in older subjects). We tested the impact of dietary obesity on I-R tolerance and reperfusion injury salvage kinase (RISK) signalling in hearts from middle-aged (10 months old) insulin-insensitive rats...
March 2013: Disease Models & Mechanisms
Nicolas Noiseux, Mélanie Borie, Alexandra Desnoyers, Ahmed Menaouar, Louis Mathieu Stevens, Samer Mansour, Bogdan A Danalache, Denis-Claude Roy, Marek Jankowski, Jolanta Gutkowska
Principal limitation of cell therapy is cell loss after transplantation because of the interplay between ischemia, inflammation, and apoptosis. We investigated the mechanism of preconditioning of mesenchymal stem cells (MSCs) with oxytocin (OT), which has been proposed as a novel strategy for enhancing therapeutic potential of these cells in ischemic heart. In this study, we demonstrate that rat MSCs express binding sites for OT receptor and OT receptor transcript and protein as detected by RT-PCR and immunofluorescence, respectively...
November 2012: Endocrinology
Robert W Schwenk, Yeliz Angin, Laura K M Steinbusch, Ellen Dirkx, Nicole Hoebers, Will A Coumans, Arend Bonen, Jos L V Broers, Guillaume J J M van Eys, Jan F C Glatz, Joost J F P Luiken
Cardiac glucose utilization is regulated by reversible translocation of the glucose transporter GLUT4 from intracellular stores to the plasma membrane. During the onset of diet-induced insulin resistance, elevated lipid levels in the circulation interfere with insulin-stimulated GLUT4 translocation, leading to impaired glucose utilization. Recently, we identified vesicle-associated membrane protein (VAMP) 2 and 3 to be required for insulin- and contraction-stimulated GLUT4 translocation, respectively, in cardiomyocytes...
October 26, 2012: Journal of Biological Chemistry
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