首页> 外文会议>Proceedings of Life in space for life on earth >EXPRESSION OF IGF-I AND PROTEIN DEGRADTION MARKERS DURING HINDLIMB UNLOADING AND GROWTH HORMONE ADMINISTRATION IN RATS
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EXPRESSION OF IGF-I AND PROTEIN DEGRADTION MARKERS DURING HINDLIMB UNLOADING AND GROWTH HORMONE ADMINISTRATION IN RATS

机译:大鼠下肢卸载和生长激素管理过程中IGF-I和蛋白降解标志物的表达

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摘要

It is known that hindlimb unloading or spaceflightrnproduce atrophy and a number of phenotypic alterationsrnin skeletal muscles. Many of these processes are triggeredrnby the axis growth hormone/insulin-like growth factor I.rnHowever growth hormone (GH) and insulin-like growthrnfactor I (IGF-I) expression relationship in rodent modelsrnof gravitational unloading is weakly investigated. Wernsupposed the IGF-I is involved in regulation of proteinrnturnover. In this study we examined the IGF-I expressionrnby RT-PCR assay in the rat soleus, tibialis anterior andrnliver after 3 day of hindlimb suspension with growthrnhormone administration. Simultaneously were studiedrnexpression levels of MuRF-1 and MAFbx/atrogin as a keyrnmarkers of intracellular proteolysis. We demonstrated thatrnGH administration did not prevent IGF-I expressionrndecreasing under the conditions of simulatedrnweightlessness. It was concluded there are separaternmechanisms of action of GH and IGF-I on proteinrnmetabolism in skeletal muscles. Gravitational unloadingrnactivate proteolysis independently of growth hormonernactivity.
机译:已知后肢卸载或太空飞行会引起骨骼肌萎缩和许多表型改变。这些过程中的许多是由轴生长激素/胰岛素样生长因子I触发的。但是,在啮齿动物模型中,对重力卸载的生长激素(GH)和胰岛素样生长因子I(IGF-1)的表达关系进行了研究。假设IGF-I参与蛋白质周转的调节。在这项研究中,我们通过RT-PCR法检测了生长激素的后肢悬吊3天后大鼠比目鱼,胫骨前和肝脏的IGF-I表达。同时研究了MuRF-1和MAFbx / atrogin的表达水平作为细胞内蛋白水解的关键指标。我们证明,在模拟失重条件下,GH的给药并不能阻止IGF-I的表达下降。结论是,GH和IGF-I对骨骼肌蛋白代谢有不同的作用机制。引力卸荷独立于生长激素活性激活蛋白水解作用。

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  • 会议地点 Aberdeen(GB)
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    State Research Center of Russian Federation Institute for Biomedical Problems RAS, Khoroshevskoe shosse, 76a, Moscow, Russia, Email: myolab@mail.ru;

    State Research Center of Russian Federation Institute for Biomedical Problems RAS, Khoroshevskoe shosse, 76a, Moscow, Russia;

    State Research Center of Russian Federation Institute for Biomedical Problems RAS, Khoroshevskoe shosse, 76a, Moscow, Russia;

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