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首页> 外文期刊>The journals of gerontology.Series A. Biological sciences and medical sciences >Exercise Training Reverses Unparallel Downregulation of MaxiK Channel alpha- and beta 1-Subunit to Enhance Vascular Function in Aging Mesenteric Arteries
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Exercise Training Reverses Unparallel Downregulation of MaxiK Channel alpha- and beta 1-Subunit to Enhance Vascular Function in Aging Mesenteric Arteries

机译:运动训练逆转MaxiK通道α-和β1-亚基的无与伦比的下调,以增强老化的肠系膜动脉的血管功能

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This study was designed to determine the effects of aerobic exercise training on aging-associated selective changes of the function and expression of the large-conductance Ca2+-activated K+ (MaxiK) channels in mesenteric arteries. Male Wistar rats aged 19-21 months were randomly assigned to sedentary (O-SED) and exercise-trained groups (O-EX). Two-month-old rats were used as Young control. Addition of iberiotoxin (10(-8) M) increased the norepinephrine-induced arterial contraction in all three groups, with the greatest enhancement being in Young and the least in O-SED. Patch clamp study revealed the characteristics of aging on MaxiK channel function in mesenteric arteries, mainly including (a) decrease of iberiotoxin-sensitive whole-cell K+ current, (b) decrease of open probability and Ca2+/voltage sensitivity of single MaxiK channel, and (c) reduction of tamoxifen-induced MaxiK activation. After exercise training, all of these changes were markedly inhibited. Western blotting revealed that the protein expression of MaxiK was significantly reduced with aging and the suppression of beta 1-subunit was larger than that of alpha-subunit, although exercise training diminished this alteration. Taken together, aerobic exercise training reverses the aging-related unparallel downregulation of MaxiK alpha- and beta 1-subunit expression on mesenteric arteries, which partly underlies the beneficial effect of exercise on restoring aging-associated reduction in mesenteric artery vasodilatory properties.
机译:本研究旨在确定有氧运动训练对肠系膜动脉中与衰老相关的功能的选择性改变以及大电导Ca2 +激活的K +(MaxiK)通道表达的影响。将19-21个月大的雄性Wistar大鼠随机分为久坐(O-SED)和运动训练组(O-EX)。将两个月大的大鼠用作年轻对照。在所有三组中,添加外毒素(10(-8)M)均会增加去甲肾上腺素诱导的动脉收缩,其中年轻患者的增强最大,而O-SED患者的最小。膜片钳研究揭示了肠系膜动脉MaxiK通道功能的衰老特征,主要包括(a)降低对毒素敏感的全细胞K +电流,(b)降低单个MaxiK通道的打开概率和Ca2 + /电压敏感性,以及(c)降低他莫昔芬诱导的MaxiK活化。运动训练后,所有这些变化均被明显抑制。蛋白质印迹显示,MaxiK的蛋白质表达随年龄的增长而显着降低,而β1亚基的抑制作用大于α亚基,尽管运动训练可以减少这种改变。总之,有氧运动训练可逆转与衰老相关的肠系膜动脉上MaxiKα-和β1-亚基表达的无与伦比的下调,这部分归因于运动对恢复与衰老相关的肠系膜动脉血管舒张特性降低的有益作用。

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