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华人声音Nature:p53介导“铁死亡”抑制肿瘤进展

2015-03-23 佚名 生物谷

近日,细胞生物学领域著名华人科学家Wei Gu在国际期刊nature在线发表了他们的最新研究进展,他们发现经典肿瘤抑制因子p53能够通过调节细胞胱氨酸代谢以及ROS应答,介导ferroptosis过程,抑制肿瘤生长,拓展了人们对p53功能的新认识。 p53是一种肿瘤抑制基因(tumor suppressor gene),在所有恶性肿瘤中,50%以上会出现该基因的突变。p53介导的细胞周期

近日,细胞生物学领域著名华人科学家Wei Gu在国际期刊nature在线发表了他们的最新研究进展,他们发现经典肿瘤抑制因子p53能够通过调节细胞胱氨酸代谢以及ROS应答,介导ferroptosis过程,抑制肿瘤生长,拓展了人们对p53功能的新认识。

p53是一种肿瘤抑制基因(tumor suppressor gene),在所有恶性肿瘤中,50%以上会出现该基因的突变。p53介导的细胞周期暂停,细胞衰老和凋亡对于抑制肿瘤发展具有重要作用,同时有研究表明p53对细胞代谢活性的调节也是其发挥抗肿瘤作用的一项重要手段。
 
研究人员发现p53能够通过下调胱氨酸/谷氨酸转运蛋白中的关键组成成分SLC7A11的表达抑制细胞对胱氨酸的摄取,并增强细胞对一种非凋亡形式的细胞死亡--"铁死亡"(ferroptosis)过程的敏感性。P53 3KR是p53蛋白的一种乙酰化缺陷突变形式,其不能够诱导细胞周期暂停,衰老和凋亡过程,但完全保留了对SLC7A11表达的调控能力,并能够促使细胞在ROS诱导的应激状态下发生"铁死亡"过程。通过对突变小鼠进行分析,研究人员发现这些p53的非经典活性能够促进胚胎发育以及与MDM2缺失相关的致死。同时,研究人员还发现SLC7A11在人类肿瘤中高表达,其过表达能够抑制ROS诱导的"铁死亡"并减弱p53 3KR介导的对肿瘤生长的抑制作用。
 
这项研究表明p53能够通过调节胱氨酸代谢,ROS应答和"铁死亡"抑制肿瘤生长的新模式,进一步拓展了人们对经典抗肿瘤因子p53的新认识,具有重要意义。

原始出处:

Le Jiang,Ning Kon,Tongyuan Li,Shang-Jui Wang,Tao Su,Hanina Hibshoosh,Richard Baer & Wei Gu.Ferroptosis as a p53-mediated activity during tumour suppression.Nature (2015) doi:10.1038/nature14344.

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    2015-10-03 liye789132251
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    2015-03-25 zhishijing
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    2015-03-23 hbwang006

    有意思

    0

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