PKCδ通过SIRT6调节染色体重塑和DNA修复.
Trisiani Affandi1, Ami Haas1, Angela M Ohm1
1Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado.
Molecular cancer research : MCR
|October 27, 2023
概括
蛋白激酶C三角酶 (PKCδ) 通过通过Sirtuin 6 (SIRT6) 控制染色质可访问性和基因素修饰来调节DNA修复和对辐射的敏感性. 抑制PKCδ增强了DNA修复,提供了潜在的辐射保护策略.
科学领域:
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
- 遗传学 是一个遗传学.
背景情况:
- 辐射 (IR) 是一种至关重要的癌症治疗方法,但会损害健康的组织,造成副作用并限制治疗.
- 蛋白激酶C三角酶 (PKCδ) 对于IR诱导的亡至关重要,其抑制提供了辐射保护.
- 尚未完全理解PKCδ在DNA损伤反应中的作用及其与染色体调节的关系.
研究的目的:
- 阐明PKCδ在照射后影响DNA修复和染色质可访问性的机制.
- 调查Sirtuin 6 (SIRT6) 作为PKCδ下游调解者在调节DNA损伤反应中的作用.
- 确定PKCδ介导的辐射诱导亡调节的新途径,并确定潜在的治疗点.
主要方法:
- 研究了PKCδ过度表达和耗尽对DNA损伤,亡和基因组稳定性的影响.
- 评估了DNA修复途径,包括非同类末端连接 (NHEJ) 和同类重组 (HR),使用光记者结构和DNA损伤焦点.
- 通过核酶灵敏度测试分析了染色质可访问性,并通过表皮蛋白质组分析检查了基因组修饰和相关蛋白质.
- 通过检查其在缺乏PKCδ的细胞中的表达及其对染色质变化和辐射保护的影响来确定SIRT6的作用.
主要成果:
- 过度表达PKCδ会增加DNA损伤和亡,而PKCδ枯竭会增强DNA修复 (NHEJ和HR) 和基因组稳定性.
- PKCδ的枯竭导致了更容易获得的染色质和改变的基因质修饰 (H3K36me2),与KDM2A解离相关.
- 鉴定出SIRT6是下游媒介;PKCδ的枯竭增加了SIRT6的表达,SIRT6的枯竭逆转了对染色质,DNA修复和辐射保护的观察效应.
- PKCδ枯竭显著增加了SIRT6表达,随后的SIRT6枯竭逆转了PKCδ枯竭细胞中观察到的辐射保护作用.
结论:
- 通过一种依赖SIRT6的机制,PKCδ调节DNA双链断裂修复和染色质的可访问性.
- 调节PKCδ活动会影响染色体结构和DNA修复通路,为癌症治疗提供一种新的策略.
- 这项研究定义了连接PKCδ,SIRT6,染色体调节和DNA修复的新途径,为辐射反应和潜在的治疗干预提供了洞察力.
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