E3 乌比奎丁结合酶 TRIM21 通过ASK1 K63-Linked Polyubiquitination加剧病理性心脏缩
Hongjie Shi1,2, Jing Xie1, Sha Hu2
1Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China.
概括
含有21的三方基因 (TRIM21) 通过激活ASK1-JNK/p38 MAPK通路来驱动病态心脏缩. 抑制这个TRIM21-ASK1轴为心脏病提供了潜在的治疗策略.
科学领域:
- 心血管生物学 心血管生物学
- 分子心脏病学分子心脏病学
- 细胞信号传输 细胞信号传输
背景情况:
- 病理性心脏缩是严重心血管结果 (如心力衰竭) 的重要危险因素.
- 导致心脏缩的复杂分子机制尚未完全阐明.
- 识别新型分子参与者对于开发向疗法至关重要.
研究的目的:
- 研究含有21的三方基因 (TRIM21) 在病理性心脏缩中的作用.
- 阐明TRIM21影响心脏缩的分子机制.
- 评估针对TRIM21途径的治疗潜力.
主要方法:
- 使用心脏缩 (横向大动脉收缩) 的小鼠模型和体外细胞培养系统 (烯刺激心肌细胞).
- 在体外和体内进行了TRIM21倒置和过度表达的研究.
- 研究了蛋白质与蛋白质的相互作用和翻译后的修改,包括ASK1.1的多比基因化.
- 分析了下游信号通路激活 (JNK/p38 MAPK) 并使用药理抑制ASK1.
主要成果:
- 在高性心脏模型中,TRIM21表达显著上调.
- TRIM21倒置减轻了心肌细胞缩,而过度表达加剧了它.
- TRIM21与ASK1直接相互作用,促进其与K63结合的多基化和随后的激活.
- 对JNK/p38 MAPK通路的激活取决于TRIM21和ASK1.
- 对ASK1的药理抑制取消了TRIM21.21的益增高效应.
结论:
- 确定了一种新的TRIM21-ASK1信号轴,它驱动病理性心脏缩.
- 通过ASK1介导的JNK/p38 MAPK通路的激活,TRIM21促进心脏缩.
- TRIM21代表了一种潜在的治疗点,用于治疗多缩性心脏病和心力衰竭.
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