Blood:TRRAP对突变型和野生型p53在淋巴瘤中的积累发挥重要的调节作用

2018-04-14 MedSci MedSci原创

肿瘤会积累高水平的p53突变(mutp53),促进mutp53获得性功能(gain of function,GOF)。目前,对于这种过度积累的潜在机制尚不清楚。现Alexander Jethwa等人为探究mutp53蛋白积累的调节机制,对Burkitt淋巴瘤(BL)的细胞系模型进行大规模的RNA干扰(RNAi)筛查。研究人员发现,TRRAP,多种组蛋白乙酰化转移酶(HAT)复合物的组成成分,对mu

肿瘤会积累高水平的p53突变(mutp53),促进mutp53获得性功能(gain of function,GOF)。目前,对于这种过度积累的潜在机制尚不清楚。

现Alexander Jethwa等人为探究mutp53蛋白积累的调节机制,对Burkitt淋巴瘤(BL)的细胞系模型进行大规模的RNA干扰(RNAi)筛查

研究人员发现,TRRAP,多种组蛋白乙酰化转移酶(HAT)复合物的组成成分,对mutp53和野生型p53(wtp53)的水平都发挥重要的正性调控作用。沉默TRRAP可减少淋巴瘤结肠癌模型中p53的积累,而过表达TRRAP可增加mutp53的水平,提示TRRAP在实体肿瘤和p53突变中都发挥一定作用。

通过CRISPR-Case9筛查,研究人员发现在HEAT的N末端,有一个包含109个氨基酸的区域,与TRRAP的对mutp53稳定和细胞增殖至关重要的区域重复。对mutp53的相互作用进行质谱分析提示,沉默TRRAP可通过MDM2蛋白酶体轴导致mutp53降解。

以上结果表明TRRAP可对抗正常p53的降解机制,对维持mutp53水平至关重要。

为筛选可类似沉默TRRAP一样减少p53积累的药物,研究人员进行小分子药物筛选,发现组蛋白去乙酰化酶(HDACs),特别是HDACs1/2/3,可相对的降低p53的水平。

总而言之,本研究证实TRRAP在p53水平调控过程中发挥核心作用,并将乙酰化修饰复合物与p53蛋白的稳定性联系起来。此外,本研究或许还为淋巴瘤和其他癌症靶向mutp53治疗提供了新的思路。

原始出处:

Alexander Jethwa,et al. TRRAP is essential for regulating the accumulation of mutant and wild-type p53 in lymphoma. Blood  2018  :blood-2017-09-806679;  doi: https://doi.org/10.1182/blood-2017-09-806679

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    2018-04-15 kafei

    谢谢分享.学习学习

    0