蛋白酶激活受体-1有助于心脏重塑和缩
Rafal Pawlinski1, Michael Tencati, Craig R Hampton
1The Scripps Research Institute, Department of Immunology, 10550 N Torrey Pines Rd, La Jolla, CA 92037, USA.
Circulation
|October 31, 2007
概括
蛋白酶激活受体-1 (PAR-1) 缺乏改善心脏损伤后的心脏功能,通过减少左心室扩张. 然而,PAR-1缺乏并没有影响心脏病发作的大小,而其过度表达则诱导了异常缩.
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
- 血栓形成研究研究
背景情况:
- 蛋白酶激活受体-1 (PAR-1) 是血栓的受体,在心肌细胞和纤维细胞等心脏细胞中表达.
- PAR-1信号传递与心肌细胞缩和纤维细胞增殖有关.
- 已知组织因子 (TF) 和血栓是导致心脏缺血 - 反 (I / R) 损伤的贡献者.
研究的目的:
- 为了研究PAR-1在心脏梗塞,心脏重塑和I/R损伤后的缩中的作用.
- 分析心肌细胞特异性PAR-1过度表达对心脏功能和结构的影响.
主要方法:
- 使用PAR-1缺陷 (PAR-1-/-) 和野生型小鼠遭受心脏I/R损伤.
- 通过心声学和组织学分析研究心脏重塑和功能.
- 研究了心肌细胞特异性PAR-1过度表达和TF基因缺失的影响.
主要成果:
- 在I/R损伤2周后,PAR-1缺乏减轻了左心室扩张和改善了心脏功能.
- PAR-1 缺陷并没有改变心脏病发作的大小,但增加了受伤区域的 ERK1/2 激活.
- 特定于心肌细胞的PAR-1过度表达导致了古怪的缩和扩张性心肌病,通过删除心肌细胞中的TF基因来减少.
结论:
- 在心肌梗塞后的心脏重塑和缩中,PAR-1发挥着重要作用.
- 在心肌细胞中PAR-1的过度表达会诱导特异性缩,这表明扩张性心肌病的机制.
- 向PAR-1可能为减少心脏缩和心脏衰竭在心肌梗塞后提供一种新的治疗策略.
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