...
首页> 外文期刊>Experimental Gerontology >Cardiac calcium pump inactivation and nitrosylation in senescent rat myocardium are not attenuated by long-term treadmill training.
【24h】

Cardiac calcium pump inactivation and nitrosylation in senescent rat myocardium are not attenuated by long-term treadmill training.

机译:长期的跑步机训练不会减弱衰老大鼠心肌中的钙泵失活和亚硝化作用。

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       

摘要

The senescent heart has decreased systolic and diastolic functions, both of which could be related to alterations in cardiac sarcoplasmic reticulum (SR) calcium (Ca(2+)) handling. The purpose of this study was to determine if SR protein content and rates of Ca(2+) release and uptake and ATPase activity are lower in the senescent (34-36 mo) Fisher 344xBrown-Norway F1 hybrid rat heart and if a long-term exercise training program could maintain SR function. Late middle aged (29 mo) male rats underwent 5-7 mo of treadmill training. Aging resulted in a decrease in SERCA activity and modest decrease in the rate of Ca(2+) uptake but no change in Ca(2+) release rate. SERCA2a content was not decreased with age but nitrotyrosine accumulation was increased and Ser16 phosphorylated phospholamban (PLN) was decreased. Ryanodine receptor content was not decreased with age but dihydropyridine receptor content was decreased in the senescent heart. Treadmill training had no significant effect on any of the SR properties or protein contents in the senescent rat heart. These results suggest that decreases in Ca(2+) uptake and SERCA activity in the senescent F344BN rat heart are due to increased SERCA2a damage from nitrotyrosine accumulation and inhibition by PLN and that exercise training initiated at late middle age is unable to prevent these age-related changes in cardiac SR function.
机译:衰老的心脏的收缩和舒张功能降低,这两者都可能与心脏肌质网(SR)钙(Ca(2+))处理的改变有关。这项研究的目的是确定在衰老(34-36 mo)Fisher 344xBrown-Norway F1杂种大鼠心脏中,SR蛋白含量,Ca(2+)释放和摄取速率以及ATPase活性是否较低,以及是否长长期运动训练计划可以维持SR功能。中晚期(29 mo)雄性大鼠接受5-7 mo跑步机训练。衰老导致SERCA活性下降,Ca(2+)吸收速率适度下降,但Ca(2+)释放速率没有变化。 SERCA2a含量并没有随着年龄的增长而降低,但是硝基酪氨酸的积累却增加了,而Ser16磷酸化的磷酰胺(PLN)却减少了。衰老心脏中,Ryanodine受体含量并未随年龄而降低,但二氢吡啶受体含量却有所降低。跑步机训练对衰老大鼠心脏的任何SR特性或蛋白质含量均无明显影响。这些结果表明,衰老的F344BN大鼠心脏中Ca(2+)吸收和SERCA活性的降低归因于硝基酪氨酸积累和PLN抑制对SERCA2a的损害增加,并且中年后期开始的运动训练无法预防这些年龄-心脏SR功能的相关变化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号