Clinorotation-induced autophagy via HDM2-p53-mTOR pathway enhances cell migration in vascular endothelial cells.

Clinorotation-induced autophagy via HDM2-p53-mTOR pathway enhances cell migration in vascular endothelial cells.
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通过 HDM2-p53-mTOR 通路旋转诱导的自噬增强血管内皮细胞的细胞迁移

DOI:
10.1038/s41419-017-0185-2
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发表时间:
2018-02-02
影响因子:
9
通讯作者:
Sun XQ
Sun XQ
中科院分区:
生物学1区
文献类型:
--
作者:
Li CF;Sun JX;Gao Y;Shi F;Pan YK;Wang YC;Sun XQ

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暴露于长期航天飞行的个人经常经历心血管功能障碍,其特征是直立性不耐受、体育锻炼残疾,甚至是明显的晕厥。近年来的研究表明,心血管系统的改变与内皮细胞功能的改变密切相关。我们以前已经表明,自噬可以诱导模拟微重力在人脐静脉内皮细胞(HUVECs)。然而,模拟微重力诱导自噬增强的机制及其在内皮功能调节中的作用仍不清楚。我们在这里报告,48小时旋转促进细胞迁移的HUVECs诱导自噬。此外,回转增强自噬的机制是人鼠双微体2(HDM 2)依赖性降解细胞质p53在26 S蛋白酶体,这导致抑制雷帕霉素(mTOR)的机械靶点,但不是通过激活AMPK在HUVEC。这些结果支持HDM 2-p53在直接下调mTOR中的关键作用,但不是通过AMPK在HUVEC中微重力诱导的自噬中。
Individuals exposed to long-term spaceflight often experience cardiovascular dysfunctions characterized by orthostatic intolerance, disability on physical exercise, and even frank syncope. Recent studies have showed that the alterations of cardiovascular system are closely related to the functional changes of endothelial cells. We have shown previously that autophagy can be induced by simulated microgravity in human umbilical vein endothelial cells (HUVECs). However, the mechanism of enhanced autophagy induced by simulated microgravity and its role in the regulation of endothelial function still remain unclear. We report here that 48 h clinorotation promoted cell migration in HUVECs by induction of autophagy. Furthermore, clinorotation enhanced autophagy by the mechanism of human murine double minute 2 (HDM2)-dependent degradation of cytoplasmic p53 at 26S proteasome, which results in the suppression of mechanistic target of rapamycin (mTOR), but not via activation of AMPK in HUVECs. These results support the key role of HDM2–p53 in direct downregulation of mTOR, but not through AMPK in microgravity-induced autophagy in HUVECs.
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