TGF-β induces corneal endothelial senescence via increase of mitochondrial reactive oxygen species in chronic corneal allograft failure.

TGF-β induces corneal endothelial senescence via increase of mitochondrial reactive oxygen species in chronic corneal allograft failure.
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在慢性角膜同种异体移植失败中,TGF-β 通过增加线粒体活性氧来诱导角膜内皮衰老。

DOI:
10.18632/aging.101659
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发表时间:
2018-11-28
期刊:
Aging
影响因子:
--
通讯作者:
Zhang J
Zhang J
中科院分区:
其他
文献类型:
--
作者:
Li Z;Liu T;Ma J;Guo Q;Ma L;Lv Q;Jiang Y;Wei C;Zhang J

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角膜内皮功能障碍会损害角膜的光学透明度,导致角膜移植失败。在形态学上,CE细胞在角膜移植后期以过早衰老为特征。然而,详细的分子机制在很大程度上是未知的。我们发现,在晚期移植物衰竭的CE中,转化生长因子-β(TGF-β)升高。此外,衰老相关基因p21和p16也增加,这与TGF-β处理人角膜内皮细胞B4 G12后其升高一致。此外,TGF-β处理导致SA-β-gal的高阳性率,表明B4 G12细胞经历细胞衰老。从机制上讲,我们证明了TGF-β可以诱导线粒体ROS(mtROS)的产生,并且mtROS清除剂可以在TGF-β处理后挽救CE细胞衰老。我们的研究提供了新的证据,表明TGF-β升高在慢性角膜移植失败的CE细胞衰老和丢失中起着至关重要的作用,这可能是临床治疗的潜在靶点。
The corneal endothelium (CE) dysfunction impairs optical transparency and leads to corneal allograft failure. Morphologically, CE cells are characterized by premature senescence at the late stage of corneal graft. However, the detailed molecular mechanisms are largely unknown. Here we found that transforming growth factor-β (TGF-β) is elevated in the CE of late graft failure. In addition, senescence-associated gene p21 and p16 are increased as well, which is consistent with their elevation upon TGF-β treatment in human corneal endothelial cell B4G12. Furthermore, TGF-β treatment leads to high positive ratio of SA-β-gal, indicating B4G12 cells undergo cellular senescence. Mechanistically, we demonstrated that TGF-β could induce mitochondrial ROS (mtROS) production and mtROS scavenger could rescue CE cell senescence upon TGF-β treatment. Our study provides new evidence that elevated TGF-β plays a crucial role in the CE cell senescence and loss in chronic corneal graft failure, which could be potential targets for clinical treatment.
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