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Cell Death Dis:PRMT1通过甲基化ATF4保护心肌细胞免受ER应激诱导损伤

2019-12-10 QQY MedSci原创

内质网(ER)应激信号在控制细胞存活或死亡中起着至关重要的作用。持续的内质网应激能够激活ATF4/CHOP相关的促凋亡信号通路。虽然越来越多的证据支持内质网应激对心血管疾病具有重要贡献,但目前其潜在机制尚不明确。近日,研究人员发现了PRMT1在心肌细胞内质网应激调控中的关键作用。 抑制PRMT1可增强心肌细胞中衣霉素(TN)诱导的内质网应激反应;相反,过表达PRMT1则可减弱TN诱导的内质网应激反

内质网(ER)应激信号在控制细胞存活或死亡中起着至关重要的作用。持续的内质网应激能够激活ATF4/CHOP相关的促凋亡信号通路。虽然越来越多的证据支持内质网应激对心血管疾病具有重要贡献,但目前其潜在机制尚不明确。

近日,研究人员发现了PRMT1在心肌细胞内质网应激调控中的关键作用。

抑制PRMT1可增强心肌细胞中衣霉素(TN)诱导的内质网应激反应;相反,过表达PRMT1则可减弱TN诱导的内质网应激反应。同样的,敲除PRTN1的心脏表现为TN诱导的内质网应激和细胞死亡反应加剧。

有趣的是,ATF4缺失能够减弱PRMT1抑制所引起的内质网应激反应。ATF4甲基化缺陷突变(第239位精氨酸变为赖氨酸)则可加重内质网应激反应,伴随TN诱导的促凋亡相关的Caspase3剪切激活和γH2AX磷酸化的水平升高。进一步的研究表明PRMT1可通过甲基化调节ATF4蛋白的稳定性。

综上所述,本研究结果揭示了PRMT1对ATF4第239位精氨酸甲基化是保护心肌细胞免受内质网应激诱导的细胞死亡的一种新型的调节机制。

原始出处:

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    2020-10-18 维他命
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    2019-12-12 cy0328
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    2019-12-12 appleandpeer

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