通过PPARγ下调调节,机械应力诱导了内皮细胞中的EndoMT
Gang Dong1, Xiaoquan Huang1, Ye Xu2
1Department of Gastroenterology and Hepatology, Zhongshan Hospital, Fudan University, Shanghai, China.
Cellular signalling
|July 19, 2023
概括
在门高血压中,机械拉伸会减少内皮细胞中PPARγ的表达,从而触发内皮细胞转变为介质细胞. 罗西格利塔治疗逆转了这些影响,提供了一个潜在的治疗策略.
科学领域:
- 血管生物学 血管生物学
- 胃肠病学 胃肠病学
- 蜂信号传输是如何进行的
背景情况:
- 门高血压涉及门系统压力增加,通常是由于肝硬化.
- 这种情况会导致门静脉内皮细胞 (ECs) 发生机械拉伸.
- 了解EC对机械拉伸的反应对于治疗门门高血压至关重要.
研究的目的:
- 在门高血压模型中研究机械拉伸对ECs的影响.
- 为了阐明背后的分子机制,拉伸诱导的变化ECs.
- 评估PPARγ激动剂在缓解这些变化的治疗潜力.
主要方法:
- 使用弹性室来模拟EC的机械拉伸.
- 通过PI3K/AKT/CREB和NEDD4途径评估PPARγ表达及其调节.
- 通过检查Smad3酸化,研究了PPARγ下调在内皮转移到介质酶过渡 (EndoMT) 中的作用.
- 评估了罗西格利塔 (PPARγ激动剂) 在体外和肝硬化小鼠模型中的作用.
主要成果:
- 机械拉伸降低了ECs中的PPARγ表达.
- 这种降低是通过阻断PI3K/AKT/CREB通路和增加NEDD4介导的PPARγ降解来调节的.
- 通过增强Smad3酸化,PPARγ下调促进了伸展诱导的EndoMT.
- 罗西格利塔治疗减轻了体外和肝硬化老鼠的伸展诱导的EndoMT.
结论:
- 机械拉伸在门静脉EC中负面调节PPARγ.
- PPARγ下调是EndoMT对机械拉伸的反应的一个关键驱动因素.
- 像罗西格利塔这样的PPARγ激动剂在治疗门高血压相关的EndoMT方面表现有前途.
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