滴毒素的抗血管效应取决于ROS引起的RhoA/ROCK通路激活
Carlotta Boscaro1, Gudula Schimdt2, Andrea Cignarella1
1Department of Medicine, University of Padova, Padova, Italy.
Biochemical pharmacology
|February 11, 2024
概括
滴滴毒素通过激活RhoA通过活性氧物种 (ROS) 生产来抑制癌细胞迁移和血管生成,独立于FAK抑制. 这一途径涉及内皮NADPH氧化酶 (NOX) 和RhoA/ROCK信号级联.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 癌症研究 癌症研究
背景情况:
- 滴滴毒素之前已经证明了与蛋白氨酸激酶2 (FAK) 抑制相关的抗血管性和抗增殖作用.
- 罗亚GTPases,RhoA和Rac1,是细胞细胞骨和运动性的关键调节者.
- 了解Rho GTPase在数字毒素抗血管原作用中的特定参与是必不可少的.
研究的目的:
- 调查RhoA和Rac1在数字毒素抗血管原效应中的作用.
- 阐明信号通路调解数字毒素对内皮细胞行为的影响.
- 确定数字毒素,活性氧物种 (ROS) 和RhoA激活之间的关系.
主要方法:
- 人类静脉内皮细胞 (HUVEC) 用数字毒素进行治疗.
- 洛伊丁染色评估了应力纤维的形成.
- 罗特基因和Pak1拉下测试检测到与GTP结合的RhoA和Rac1.
- 罗亚沉默和Y-27632治疗抑制了罗亚-ROCK轴.
- 测量了细胞内ROS水平.
- 使用了NADPH氧化酶 (NOX) 抑制剂 (DPI,VAS-2870).
主要成果:
- 数字毒素诱导了压力纤维的形成和持续的RhoA激活在HUVEC中,而不会影响Rac1.
- 通过向RhoA-ROCK通路,逆转了Digitoxin对HUVEC迁移和管形成的抑制作用.
- 滴毒素治疗以剂量依赖的方式增加了细胞内ROS水平.
- 通过内皮NOX产生的ROS被确定为数字毒素诱导的RhoA激活的关键媒介.
- 通过数字毒素激活RhoA独立于FAK抑制.
结论:
- 滴毒素的抗血管性作用是由内皮NOX产生的ROS产生的,导致RhoA/ROCK通路的激活.
- 这项研究揭示了一种涉及ROS和RhoA在digitoxin抗血管新生活性中的新机制.
- 这些发现表明,通过影响细胞骨组织和细胞运动性,数字毒素对癌症进展的影响具有更广泛的含义.
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