AGING CELL:维生素A受体可以预防衰老

2018-09-17 海北 MedSci原创

已有的研究显示,钙信号传递是控制细胞衰老的关键途径,细胞衰老是一种稳定的细胞增殖停滞,在病理生理条件中发挥重要作用,例如胚胎发育,伤口愈合,癌症和衰老。然而至今为止,钙信号传导如何被调节仍然只是部分被理解。

已有的研究显示,钙信号传递是控制细胞衰老的关键途径,细胞衰老是一种稳定的细胞增殖停滞,在病理生理条件中发挥重要作用,例如胚胎发育,伤口愈合,癌症和衰老。然而至今为止,钙信号传导如何被调节仍然只是部分被理解。
肌醇1,4,5-三磷酸受体2型(ITPR2),一种内质网钙释放通道,最近被发现对衰老起关键作用,但ITPR2表达如何被控制尚不清楚。
为了深入了解ITPR2表达的调控,研究人员进行了针对160种转录因子和表观遗传调节因子的siRNA筛选。有趣的是,研究人员发现属于核受体家族的类视黄醇X受体α(RXRA)通过ITPR2和线粒体钙单向转运蛋白(MCU)抑制ITPR2表达,并调节钙信号传导。
RXRA的敲低通过ITPR2-MCU钙信号轴,诱导产生活性氧(ROS)和DNA损伤,并因此通过激活p53来触发细胞衰老,而RXRA过表达降低DNA损伤积累,然后延迟复制衰老。
总而言之,该研究工作阐明了控制钙信号传导和细胞衰老的新机制,并为核受体的作用提供了新的见解。

原始出处:
Xingjie Ma et al. The nuclear receptor RXRA controls cellular senescence by regulating calcium signaling. AGING CELL 2018, DOI: https://doi.org/10.1111/acel.12831

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    2018-11-01 维他命
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    2018-09-23 guangyi1980

    谢谢分享,学习了!

    0

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    2018-09-21 guangyi1980

    学习了

    0

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    2018-09-19 guangyi1980

    学习了

    0

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    2018-09-19 wwzzly
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    2018-09-17 liumin1987

    维生素A受体可预防衰老。

    0

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