EphA2 signaling within integrin adhesions regulates fibrillar adhesion elongation and fibronectin deposition.

EphA2 signaling within integrin adhesions regulates fibrillar adhesion elongation and fibronectin deposition.
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DOI:
10.1016/j.matbio.2021.09.001
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发表时间:
2021-09
期刊:
Matrix biology : journal of the International Society for Matrix Biology
影响因子:
--
通讯作者:
Orr AW
Orr AW
中科院分区:
其他
文献类型:
--
作者:
Finney AC;Scott ML;Reeves KA;Wang D;Alfaidi M;Schwartz JC;Chitmon CM;Acosta CH;Murphy JM;Alexander JS;Pattillo CB;Lim ST;Orr AW

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多功能糖蛋白纤连蛋白影响多种关键的细胞过程,并与多种疾病相关。虽然纤连蛋白相关疾病与受体酪氨酸激酶EphA2之间存在关联,但EphA2促进纤连蛋白基质重塑的机制仍不明确。我们之前的研究表明,EphA2缺失会减少平滑肌中纤连蛋白的沉积,并减弱动脉粥样硬化中的纤连蛋白沉积,但不影响纤连蛋白的表达。我们现在发现,EphA2的表达对于驱动纤连蛋白原纤维形成的、富含张力蛋白和α5β1整合素的纤维状黏附在收缩力依赖下的伸长是必需的。从机制上讲,EphA2定位于整合素黏附部位,在此处黏着斑激酶介导不依赖配体的Y772位点磷酸化,而该位点的突变会显著减弱纤维状黏附的长度。EphA2缺陷通过增强p190RhoGAP的激活并降低RhoA的活性,从而降低平滑肌细胞的收缩力,而在EphA2缺陷细胞中刺激RhoA信号通路则可挽救纤维状黏附的伸长。综上所述,这些数据确定EphA2是纤维状黏附伸长的新型调节因子,并首次提供了确定EphA2信号在整合素黏附中作用的数据。
The multifunctional glycoprotein fibronectin influences several crucial cellular processes and contributes to multiple pathologies. While a link exists between fibronectin-associated pathologies and the receptor tyrosine kinase EphA2, the mechanism by which EphA2 promotes fibronectin matrix remodeling remains unknown. We previously demonstrated that EphA2 deletion reduces smooth muscle fibronectin deposition and blunts fibronectin deposition in atherosclerosis without influencing fibronectin expression. We now show that EphA2 expression is required for contractility-dependent elongation of tensin- and α5β1 integrin-rich fibrillar adhesions that drive fibronectin fibrillogenesis. Mechanistically, EphA2 localizes to integrin adhesions where focal adhesion kinase mediates ligand-independent Y772 phosphorylation, and mutation of this site significantly blunts fibrillar adhesion length. EphA2 deficiency decreases smooth muscle cell contractility by enhancing p190RhoGAP activation and reducing RhoA activity, whereas stimulating RhoA signaling in EphA2 deficient cells rescues fibrillar adhesion elongation. Together, these data identify EphA2 as a novel regulator of fibrillar adhesion elongation and provide the first data identifying a role for EphA2 signaling in integrin adhesions.
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