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过度的MYC-topoisome活动会引发急性DNA损伤,MYC降解,并被p53-topoisome取代

Subhendu K Das¹, Sharmistha Karmakar², Harish Venkatachalapathy³

¹Laboratory of Pathology, National Cancer Institute, Bethesda, MD 20892, USA.

|October 31, 2024

概括

过度的MYC活动会导致DNA损伤,激活p53. 然后,p53通过形成自身的拓酶复合体来控制这种损伤,最终抑制MYC驱动的细胞增殖.

科学领域:

分子生物学分子生物学
癌症研究癌症研究
遗传学遗传学是一个

背景情况:

原生基MYC驱动细胞的过度增殖,可能导致DNA损伤.
以前的理论表明,DNA损伤是由于过度转录和过度复制引起的.
连接MYC活动与DNA损伤以及随后的细胞反应的确切机制尚不清楚.

研究的目的:

为了调查MYC-topoisomerase活性在导致DNA损伤中的直接作用.
阐明p53对MYC驱动的DNA损伤的反应机制.
了解p53如何调节MYC驱动的扩散.

主要方法:

在体外和体内研究分析MYC-topoisomerase相互作用.
检测检测DNA损伤和pATM和p53.3的激活.
对拓酶活性和DNA损伤反应途径的分析.

主要成果:

过度的MYC-拓酶活性会严重破坏DNA,激活pATM和p53.
随后MYC被降解,释放出拓酶1 (TOP1) 和拓酶2A (TOP2A).
为了应对拓压力,p53形成了独特的拓酶复合体,最初会导致DNA损伤,但随后通过DNA损伤反应 (DDR) 和氨基-DNA-基化酶 (TDP1) 和TDP2抑制进一步的损伤.

结论:

MYC-拓酶活性是急性DNA损伤的直接来源.
p53利用拓酶来调节基因表达和控制MYC驱动的增殖.
这种p53介导的拓酶活性作为MYC驱动的增殖的制动,防止不受控制的细胞生长.

关键词:

造成的DNA损伤是DNA损伤.修复DNA的修复DNA的修复这就是MYC-topoisome.在 p53 里,p53 是一个 p53 的类型.超级卷圈的超级卷圈是一种超级卷圈.毒酶酶的使用方法

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