准Eprostanoid受体EP4可以缓解由β-上腺激活诱导的心脏纤维化
Hu Xu1,2, Xiuhui Mao2,3, Yali Wang3
1Wuhu Hospital, East China Normal University, Shanghai, 200241, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|February 8, 2025
概括
在心肌细胞和心脏纤维细胞中准前列腺素E2 (PGE2) 受体EP4显著改善了由β-上腺激活引起的心脏纤维化和心脏静脉功能障碍.
科学领域:
- 心血管生物学 心血管生物学
- 纤维化研究 纤维化研究
- 药理学 药理学是指药理学的学科.
背景情况:
- 持续的β-上腺激活会导致心脏纤维化,原因是细胞外基质 (ECM) 沉积过多.
- 前列腺素E2 (PGE2) 受体EP4在维持心血管平衡中起着至关重要的作用.
- 在诱导心脏纤维化期间,EP4在心肌细胞 (CMs) 和心脏纤维细胞 (CFs) 中的特定作用尚未完全理解.
研究的目的:
- 研究心肌细胞EP4和心脏纤维细胞EP4在异二醇 (ISO) 诱导的心脏纤维化中的不同作用.
- 阐明EP4在响应β-上腺刺激时影响纤维化发育的分子机制.
主要方法:
- 产生心肌细胞特异性EP4淘汰赛 (EP4f/f-α-MyHCCre+) 和心脏纤维细胞特异性EP4淘汰赛 (EP4f/f-S100A4Cre+) 的小鼠.
- 给小鼠使用异二醇 (ISO) 诱导心脏纤维化.
- 评估心脏功能使用心声回声学和纤维化使用组织学染色.
- 研究的分子通路包括cAMP/PKA,TGF-β1,TGF-β受体复合体的形成,以及ERK1/2信号传递.
主要成果:
- 无论是心肌细胞特异性还是心脏纤维细胞特异性EP4淘汰赛小鼠,在ISO治疗后,心脏扩张功能显著改善,纤维化减少.
- 在心肌细胞中,EP4抑制通过cAMP/PKA通路抑制了ISO诱导的TGF-β1表达.
- 在心脏纤维细胞中,EP4抑制逆转了TGF-β1诱导的ECM产生,并通过干扰TGF-β受体复合体形成和抑制ERK1/2信号,阻止了增殖.
- 在两种细胞类型中对EP4进行双重淘汰,并给予EP4抗剂葡萄,显著改善了心脏功能障碍和纤维化.
结论:
- 心肌细胞EP4和心脏纤维细胞EP4都对β-上腺素激活诱导的心脏纤维化有显著的贡献.
- 向EP4为治疗心脏纤维化提供了一个潜在的新疗法策略.
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