在HFpEF中通过Wnt5a介导的脂肪心脏器官间通信
Anam Fatima1,2, Faris Abusharkh1,2, Zoe Zanetta1,2,3
1Department of Veterans Affairs, Tennessee Valley Healthcare System, Nashville, TN, USA.
bioRxiv : the preprint server for biology
|November 24, 2025
概括
脂肪细胞中天然尿素清除受体 (Nprc) 干扰通过恢复Wnt5a信号来逆转与肥胖相关的心力衰竭与保存的喷射分数 (HFpEF). 这揭示了肥胖相关心脏重塑的一个关键机制.
科学领域:
- 心血管生物学 心血管生物学
- 代谢性疾病研究研究
- 心脏衰竭的分子机制
背景情况:
- 肥胖是心力衰竭的重要危险因素,具有保存的喷射分数 (HFpEF).
- 在HFpEF中,将肥胖与心脏重塑联系在一起的确切机制尚不清楚.
- 以前的研究表明,增加尿素清除受体 (Nprc) 表达可能有助于心脏重塑,以应对高脂肪饮食.
研究的目的:
- 研究Nprc在实验性HFpEF的发展和逆转中的作用.
- 测试Nprc对于预防和逆转HFpEF的核心作用的假设.
- 阐明涉及Nprc在与肥胖相关的心脏功能障碍中的特定细胞机制.
主要方法:
- 生成的Nprc淘汰赛小鼠具有全球性,心肌细胞特异性或脂肪细胞特异性基因破坏.
- 使用两次成功模型 (L-NAME和高脂肪饮食) 诱导的HFpEF.
- 通过心声学,运动测试,导管和组织学评估结果;利用大量RNA测序用于脂肪组织中的基因表达分析.
主要成果:
- 全球诱导性Nprc淘汰赛改善了HFpEF特征,包括结构性,血液动力学和运动耐受性缺陷.
- 这些有益影响归因于脂肪细胞特异性的Nprc破坏,而不是心肌细胞特异性的.
- 脂肪细胞Nprc淘汰导致Wnt通路的下调,特别是Wnt5a;Wnt5a的使用增加了心肌细胞缩,同时阻断Wnt连接体释放改善了HFpEF中的心脏重塑.
结论:
- 在与肥胖相关的HFpEF中确定了脂肪细胞和心肌细胞之间的新型交叉声.
- 证明通过尿酸介导的Wnt5a从脂肪细胞释放的抑制驱动心脏重塑.
- Nprc在脂肪细胞心脏交叉中发挥着关键作用,为与肥胖相关的HFpEF提供了潜在的治疗标.
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