通过EGFR介导的HSP70酸化促进了PCNA与染色质和DNA复制的关联
Yingying Wang1, Anthony Fernandez1, Xinyu Pei1
1Department of Cancer Genetics and Epigenetics, Beckman Research Institute, City of Hope, 1500 East Duarte Road, Duarte, CA 91010, USA.
Nucleic acids research
|October 29, 2024
概括
皮表皮生长因子受体 (EGFR) 酸化热冲击蛋白70 (HSP70),增强DNA复制. 抑制HSP70会损害DNA合成,并增强EGFR突变肺癌的抗癌治疗.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 在瘤学瘤学.
背景情况:
- 高效的DNA复制依赖于精确的蛋白质复合体招募到复制叉.
- 由缺陷引起的复制压力会触发细胞循环检查点,抑制增殖,并诱导亡.
- 细胞对生长信号的反应加速DNA复制蛋白的招募,以防止压力.
研究的目的:
- 阐明细胞生长信号促进DNA复制蛋白招募的机制.
- 研究表皮生长因子受体 (EGFR) 在通过热冲击蛋白70 (HSP70) 调节DNA复制中的作用.
主要方法:
- 在DNA复制的背景下,研究了EGFR对HSP70的酸化.
- 研究了HSP70调制 (击退/抑制) 对PCNA染色体协会,DNA合成和Okazaki片段成熟的影响.
- 评估了HSP70抑制与EGFR-tyrosine激酶抑制剂结合用于瘤减少的体内疗效.
主要成果:
- EGFR酸化HSP70,促进其核局部化和染色体结合.
- 化HSP70与PCNA相互作用,促进其加载到染色体上.
- 抑制HSP70会破坏PCNA结合,损害DNA合成,并导致双链断裂和亡.
- 在体内,HSP70的抑制增强了EGFR-氨酸激酶抑制剂的抗瘤作用.
结论:
- 通过EGFR介导的HSP70酸化对于有效的DNA复制至关重要.
- 针对HSP70与EGFR抑制剂一起,为EGFR突变肺癌提供了一个潜在的治疗策略.
- 这项研究加深了对瘤发生和DNA复制调节的理解.
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