右心室适应压力过载的性变态包括差异性血管新生反应
Erica R Seelemann1, Sheethal Panchakshari1, Parabhjot Kaur Labana1
1Department of Physiology and Biophysics, Dalhousie University, Halifax, Nova Scotia, Canada.
American journal of physiology. Heart and circulatory physiology
|January 28, 2025
概括
雌性大鼠比雄性更好地适应右心室 (RV) 对肺动脉带状 (PAB) 的适应. 这涉及到增强的RV血管性反应,由雌激醇和氨酸激酶-1 (Sphk1) 驱动,促进适应性重塑.
科学领域:
- 心血管研究研究心血管研究
- 身体生理学 身体生理学
- 疾病中的性别差异.
背景情况:
- 肺高血压可能导致右心力衰竭.
- 在右心室 (RV) 改造中的性二态性并未完全被理解.
- 调查RV适应压力过载的性别差异至关重要.
研究的目的:
- 在RV改造中研究性二态性,用于肺高血压的老鼠模型.
- 在雄性和雌性大鼠中确定适应性与不适应性RV重塑的基础机制.
- 探索血管生成和雌激醇在RV适应中的作用.
主要方法:
- 在菲舍尔CDF大鼠中的肺动脉带纹 (PAB) 模型.
- 心声学和血液动力学测量.
- 聚焦PCR阵列用于基因表达和RV血管密度评估.
- 在体外研究使用RV内皮细胞 (RVEC) 和雌激素治疗.
主要成果:
- 在两种性别中,PAB诱导了RV缩和压力过载,没有初始的性别差异.
- 在PAB后2周,雄性大鼠显示心肌细胞大小和RV直径增加.
- 雌性大鼠表现出保留的RV功能 (更高的分数面积变化和心脏指数) 和增加的RV血管密度.
- 雌性RVECs表现出增强的血管生成能力,通过Sphk1.1,由雌激素增强.
结论:
- 雌性费舍尔CDF老鼠在PAB之后显示适应性RV重塑,与雄性不适应性重塑形成对比.
- 在女性中,增强的RV血管性反应与优越的RV内皮细胞血管性能力有关.
- 雌激醇通过Sphk1作用,有助于在女性中观察到的益血管效应和适应性RV重塑.
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