一个卵巢完整的绝经后HFpEF小鼠模型;绝经不仅仅是雌激素缺乏症
Mei Methawasin1,2, Joshua Strom1, Vito A Marino3
1Department of Cellular and Molecular Medicine and Sarver Molecular Cardiovascular Research Program, University of Arizona, Tucson, Arizona, United States.
American journal of physiology. Heart and circulatory physiology
|February 18, 2025
概括
更年期显著增加了女性心力衰竭与保存的喷射率 (HFpEF) 的风险. 使用VCD和2hit方案的新"卵巢完好"小鼠模型成功模仿绝经后的HFpEF,揭示了心肌细胞功能障碍和潜在的雄激素影响.
科学领域:
- 心血管生物学 心血管生物学
- 生殖内分泌学 生殖内分泌学
- 翻译医学是一种翻译医学.
背景情况:
- 在绝经后的女性中,心力衰竭与保留喷射分数 (HFpEF) 的发生率急剧上升.
- 现有的动物模型,如卵巢切除 (OVX) 的小鼠,无法复制绝经期的HFpEF.
- 更年期在HFpEF中的作用是复杂的,不仅仅涉及衰老或雌激素缺乏.
研究的目的:
- 在雌性小鼠中开发一种新的绝经后HFpEF动物模型.
- 在这个模型中,研究 HFpEF 背后的心脏和心肌细胞水平机制.
- 探索激素变化,特别是雄激素在HFpEF易感性方面的潜在作用.
主要方法:
- 在雌性小鼠中使用4-乙烯基环二氧化物 (VCD) 诱导"未受损的卵巢"更年期.
- 结合VCD治疗与2hit治疗方案来诱导HFpEF.
- 评估心脏功能 (透析功能障碍,心肺硬度,充满压力),心肌细胞特性和荷尔蒙水平 (,NT-pro-BNP).
主要成果:
- 雌性VCD-2被击中的小鼠表现出显著的腹功能障碍,增加左心室 (LV) 硬度,并增加LV填充压力.
- 心肌细胞分析显示细胞扩张性硬度增加和放松延迟,表明心肌细胞衍生的功能障碍.
- 血NT-pro-BNP升高和Xbp1s转录减少支持HFpEF表型;观察到血自由的增加.
结论:
- 该VCD-2hit模型有效地复制了HFpEF表型在卵巢完整的绝经后雌性小鼠中.
- 绝经后的状态,特别是在卵巢完好无损的个体中,赋予了HFpEF的脆弱性.
- 相对的雄激素过量可能会导致HFpEF易感性,强调需要考虑超越雌激素缺乏症的荷尔蒙失衡.
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