环素D-CDK4二硫化键减弱肺血管细胞增殖的作用
Hannah Knight1, Giancarlo Abis2, Manpreet Kaur1
1School of Cardiovascular and Metabolic Medicine and Sciences, British Heart Foundation Centre of Research Excellence (H.K., M.K., H.L.H.G., J.C., O.R.), King's College London, United Kingdom.
Circulation research
|November 13, 2023
概括
研究人员在环素D-CDK4中发现了一种新的二硫化键,可以抑制其活性,阻止细胞增殖. 这一发现为开发肺高血压 (PH) 向治疗提供了潜力.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 心血管研究研究心血管研究
背景情况:
- 肺高血压 (PH) 是一种血管疾病,其特征是平滑肌肉细胞过度生长和细胞代谢改变.
- 特定的氧化还原调节蛋白在控制PH中的细胞增殖中的作用在很大程度上是未知的.
- 氧化应激可以诱导细胞循环停止,但精确的机制尚未完全理解.
研究的目的:
- 为了确定参与肺高血压中细胞增殖的新型氧化还原调节蛋白质.
- 研究新发现的环素D-CDK4中的二硫化键在调节细胞增殖和PH中的作用.
- 探索针对PH治疗这种二硫化键的治疗潜力.
主要方法:
- 在人类肺细胞中检测循环素D-CDK4的氧化变化.
- 利用了位点定向突变发生,质谱和基于细胞的测试.
- 在临床前的PH模型和患者样本中评估了 in vivo 中的cyclin D-CDK4氧化.
主要成果:
- 在环林D-CDK4中,在C7/8和C135之间形成可逆二硫化键,抑制其激酶活性,并诱导细胞循环停止.
- 在小鼠模型中,CDK4 C135的突变损害了激酶活性,减少了增殖,并减轻了PH.
- 肺动脉高血压患者的CDK4二硫化物水平降低,表明CDK4过活.
- 奥拉诺芬治疗,诱导二硫化键,在实验PH模型中降低了疾病的严重程度.
结论:
- 环林D-CDK4中的一种新型二硫化键可以作为一个开关来抑制激酶活性并停止细胞增殖.
- 在CDK4中关键的氨酸残留物中这种独特的氧化修饰是选择性共价抑制剂的目标.
- 针对这种机制有望开发有效的肺高血压治疗方法.
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