推动P16甲基化对端粒酶逆转录酶介导的不朽化和正常人体纤维细胞的转化
Xuehong Zhang1, Paiyun Li2,3, Ying Gan1
1Key Laboratory of Carcinogenesis and Translational Research (MOE/Beijing), Division of Etiology, Peking University Cancer Hospital and Institute, Beijing 100142, China.
Chinese medical journal
|February 29, 2024
概括
由端粒酶逆转录酶 (TERT) 驱动的P16甲基化促进正常人体细胞的不朽化和转化,可能有助于癌症的发展. 这项研究为P16提供了实验证据.
科学领域:
- 表观遗传学和癌症生物学
- 细胞不朽化和转化
背景情况:
- 在人类癌症中,P16基因失活和端粒酶逆转录酶 (TERT) 放大是常见的.
- 像P16甲基化这样的表观遗传变化与癌症的发展有关,但直接的因果证据有限.
研究的目的:
- 提供实验证据表明P16甲基化直接驱动癌症的发展.
- 研究P16甲基化在TERT介导的细胞过程中的作用.
主要方法:
- 使用一种基于指蛋白的P16特异性DNA甲基转移酶 (P16-Dnmt) 载体,与一个指蛋白基DNA甲基转移酶 (P16-Dnmt) 载体.
- 这就是Tet-On.
- 切换以诱导人体纤维细胞 (CCD-18Co细胞) 中的P16甲基化.
- 通过电池测试评估细胞不朽化和转化.
- 采用细胞子克隆和DNA条形码来追踪细胞进化.
主要成果:
- 单独P16甲基化促进了细胞增殖和延长细胞寿命,但没有诱导永生.
- 结合P16甲基化和TERT表达导致细胞不朽化,接触抑制的丧失,以及独立于固的生长 (细胞转化).
- 与单独的TERT细胞相比,具有P16甲基化的TERT表达细胞表现出增强的亚克隆形成能力和更大的种群多样性.
结论:
- 在正常人细胞中,P16甲基化是TERT介导的不朽化和转化的一个关键驱动因素.
- 这些发现表明,表观遗传变化有助于癌症发展的直接机制.
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