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首页> 外文期刊>Open Journal of Applied Sciences >Myosin Heavy Chain Expression and Oxidative Modifications in Diabetic Rat Hearts
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Myosin Heavy Chain Expression and Oxidative Modifications in Diabetic Rat Hearts

机译:糖尿病大鼠心脏中肌球蛋白重链的表达和氧化修饰

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In this study, we tested the hypotheses that 1) diabetes-induced disturbances in cardiac my-ATPase activity would be attributed to not only myosin heavy chain (MHC) isoform transitions, but also reduced amounts in MHC protein; and 2) if diabetes results in declines in the MHC protein content, this change would relate to oxidative damage to MHC. Diabetes was induced by a single intraperitoneal injection of streptozotocin. After 6 weeks of injection, the left ventricles were excised for mechanical and biochemical analyses. Peak twitch tension and the rate of force development in papillary muscles were decreased by 23.4% and 34.1%, respectively. A 33.5% reduction in myofibrillar ATPase activity occurred in conjunction with a 9.5% decrease in MHC protein as well as MHC isoform transitions towards a slower phenotype. The decreased MHC content was not accompanied by elevations in carbonyl groups present in MHC. Whole muscle analyses indicated that the contents of malondialdehyde and reduced glutathione were elevated. These results suggest that decreases in the MHC content may be associated, at least in part, with a diabetes-related inactivation of cardiac my-ATPase and may not be due to accumulation of oxidative damage to protein.
机译:在这项研究中,我们检验了以下假设:1)糖尿病引起的心脏my-ATPase活性紊乱不仅归因于肌球蛋白重链(MHC)同工型转变,还归因于MHC蛋白量减少; 2)如果糖尿病导致MHC蛋白含量下降,则这种变化与MHC的氧化损伤有关。腹膜内注射链脲佐菌素可诱发糖尿病。注射6周后,切除左心室进行机械和生化分析。乳头肌的峰值抽搐张力和力量发展率分别降低了23.4%和34.1%。肌原纤维ATPase活性降低了33.5%,MHC蛋白降低了9.5%,MHC亚型向较慢的表型过渡。 MHC含量的降低并没有伴随着MHC中羰基的增加。整个肌肉分析表明,丙二醛和还原型谷胱甘肽的含量升高。这些结果表明,MHC含量的降低可能至少部分与糖尿病相关的心肌my-ATPase失活有关,并且可能不是由于蛋白质氧化损伤的积累。

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