AGING CELL:IGF-1异构体对肌肉生长和肌萎缩的影响

2019-04-12 海北 MedSci原创

衰老中发生的骨骼肌质量和强度的下降,称为肌肉减少症,这是许多因素的结果,包括蛋白质合成和降解之间的不平衡,代谢/激素状态的变化,以及炎症介质的循环水平。

衰老中发生的骨骼肌质量和强度的下降,称为肌肉减少症,这是许多因素的结果,包括蛋白质合成和降解之间的不平衡,代谢/激素状态的变化,以及炎症介质的循环水平。因此,增加肌肉量和促进合成代谢途径的因素可能对抵抗肌肉减少症具有治疗益处。

其中,胰岛素样生长因子-1(IGF-1)与骨骼肌中的许多合成代谢途径有关。 IGF-1以不同的同种型存在,可能在骨骼肌中发挥不同的作用。

最近,研究人员探究了两种完整的前肽IGF-1Ea和IGF-1Eb在骨骼肌中的作用,目的是确定它们的过表达是否以及通过哪种机制影响肌肉衰老。

研究人员发现,只有IGF-1Ea的表达在年轻小鼠中促进明显的肥大表型,其在老年小鼠中维持。然而,对老年转基因小鼠的检查显示,IGF-1Ea或IGF-1Eb转基因的局部表达对年龄相关的肌肉质量和力的损失具有保护作用。

在分子水平上,两种同种型均激活自噬/溶酶体系统,通常在衰老过程中发生改变,并增加PGC1-α表达,调节线粒体功能,ROS解毒和老年时发生的基础炎症状态。

此外,在老化期间,MLC / IGF-1Ea和MLC / IGF-1Eb在小鼠中维持并保持神经肌肉接头的形态完整性。

这些数据表明IGF-1是一种很有前途的治疗药物,可以防止肌肉无力。


原始出处:

Francesca Ascenzi et al. Effects of IGF‐1 isoforms on muscle growth and sarcopenia. AGING CELL, 2019; doi:  https://doi.org/10.1111/acel.12954


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    2019-12-29 qingrejiedu
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    2019-10-21 维他命
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    2019-09-25 仁医06
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    2019-10-28 chendoc252
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