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大鼠眼外肌细胞死亡途径的年龄相关性变化。

Age-related changes of cell death pathways in rat extraocular muscle.

机构信息

Department of Physiology, University of Kentucky, 800 Rose St., MS508, Lexington, KY 40536-0298, USA.

出版信息

Exp Gerontol. 2009 Jun-Jul;44(6-7):420-5. doi: 10.1016/j.exger.2009.03.006. Epub 2009 Mar 31.

Abstract

Changes in the structure and function of aging non-locomotor muscles remains understudied, despite their importance for daily living. Extraocular muscles (EOMs) have a high incidence of age-related mitochondrial defects possibly because of the metabolic stress resulting from their fast and constant activity. Apoptosis and autophagy (type I and II cell death, respectively) are linked to defects in mitochondrial function and contribute to sarcopenia in hind limb muscles. Therefore, we hypothesized that apoptosis and autophagy are altered with age in the EOMs. Muscles from 6-, 18-, and 30-month-old male Fisher 344-Brown Norway rats were used to investigate type I cell death, caspase-3, -8, -9, and -12 activity, and type II cell death. Apoptosis, as measured by TUNEL positive nuclei, and mono- and oligo-nucleosomal content, did not change with age. Similarly, caspase-3, -8, -9, and -12 activity was not affected by aging. By contrast, autophagy, as estimated by gene expression of Atg5 and Atg7, and protein abundance of LC3 was lower in EOMs of aged rats. Based on these data, we suggest that the decrease in autophagy with age leads to the accumulation of damaged organelles, particularly mitochondria, which results in the decrease in function observed in EOM with age.

摘要

衰老的非运动肌肉的结构和功能变化仍然研究不足,尽管它们对日常生活很重要。眼外肌(EOM)发生年龄相关性线粒体缺陷的几率较高,可能是由于其快速且持续的活动导致代谢压力所致。细胞凋亡和自噬(分别为 I 型和 II 型细胞死亡)与线粒体功能缺陷有关,并导致后肢肌肉的消耗症。因此,我们假设 EOM 中的细胞凋亡和自噬会随年龄而改变。使用来自 6、18 和 30 月龄雄性 Fisher 344-Brown Norway 大鼠的肌肉来研究 I 型细胞死亡、半胱天冬酶-3、-8、-9 和 -12 的活性以及 II 型细胞死亡。细胞凋亡(通过 TUNEL 阳性核来衡量)和单核和寡核小体含量未随年龄而改变。同样,衰老也不影响 caspase-3、-8、-9 和 -12 的活性。相比之下,自噬(通过 Atg5 和 Atg7 的基因表达以及 LC3 的蛋白丰度来估计)在老年大鼠的 EOM 中降低。根据这些数据,我们认为随着年龄的增长,自噬的减少会导致受损细胞器(尤其是线粒体)的积累,从而导致 EOM 随年龄增长而出现功能下降。

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