表观遗传疗法诱导逆转SINE的转录和ADAR1的依赖性
Parinaz Mehdipour1, Sajid A Marhon2, Ilias Ettayebi2,3
1Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada. parinaz.mehdipour@uhnresearch.ca.
Nature
|October 22, 2020
概括
表观遗传疗法通过双链RNA (dsRNA) 激活杀死癌细胞的反元素. 将这些疗法与ADAR1抑制剂相结合,可以通过增强病毒模拟反应来加强癌症治疗.
科学领域:
- 癌症学
- 免疫学
- 分子生物学
背景情况:
- 表观遗传疗法激活内源逆位元,产生双链RNA (dsRNA),从而触发癌细胞中的抗病毒反应.
- 表观遗传疗法的临床疗效有限,因此需要加强其抗癌作用的策略.
- 鉴定表观遗传药物激活的特定反元素对于协同治疗方法至关重要.
研究的目的:
- 鉴定药物诱导的免疫性dRNA生成的特定反元素.
- 阐明表观遗传疗法诱导病毒模拟的机制.
- 探索向ADAR1以加强表观遗传癌症治疗的可能性.
主要方法:
- 在癌细胞中通过表观遗传疗法激活反元素的分析.
- 研究dRNA的产生和MDA5受体的激活.
- 评估ADAR1在调节病毒仿真反应中的作用.
- 在临床前癌症模型中评估结合表观遗传疗法和ADAR1抑制.
主要成果:
- 药物诱导的免疫性dsRNA主要来自反转重复的Alu元素,一种SINE反元素.
- 作为病毒仿真反应的负反调节剂,ADAR1酶会破坏反转重复的Alu dsRNA的稳定性.
- 减少ADAR1增强了表观遗传疗法的效果,抑制了患者细胞中的瘤生长和癌症发病.
结论:
- 表观遗传疗法通过激活特定的反向重复 Alu 元素来诱导病毒模拟,从而产生对 ADAR1 的依赖.
- 将表观遗传疗法与ADAR1抑制剂相结合,是克服局限性并改善癌症治疗结果的有希望的策略.
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