孕产妇肥胖导致肌肉功能障碍通过H19介导的胰岛素类生长因子2信号编程
Sharmeen Islam1, Xinrui Li1, M D Nazmul Hossain1
1Nutrigenomics and Growth Biology Laboratory, Department of Animal Sciences, Washington State University, Pullman, WA.
孕产妇肥胖 (MO) 会增加H19的表达,破坏胰岛素样生长因子2 (IGF2) 信号传递,并影响后代的肌肉发育. 这种表观遗传干扰导致长期肌肉功能障碍,突出显示了潜在的治疗标.
科学领域:
- 发育生物学是发展生物学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 代谢障碍 代谢障碍 代谢障碍
背景情况:
- 孕产妇肥胖 (MO) 影响了42%的美国生育年龄妇女,影响后代的肌肉和新陈代谢.
- 胰岛素样生长因子2 (IGF2) 途径对肌肉生长至关重要,但其由MO调节的作用尚不清楚.
- H19是一种长非编码RNA,与IGF2相互调节,并与EZH2相互作用,这是一个关键的表观遗传修饰剂.
研究的目的:
- 通过H19/IGF2途径,研究孕产妇肥胖 (MO) 如何通过表观遗传调节后代的肌肉发育.
- 确定H19-EZH2相互作用在调解MO对后代肌肉影响中的作用.
- 探索减轻MO诱导的肌肉功能障碍的潜在治疗点.
主要方法:
- 利用高脂肪饮食诱导的孕产妇肥胖症的小鼠模型.
- 评估后代的肌肉功能,新陈代谢和基因表达.
- 研究了IGF2 P3促进体的H19-EZH2相互作用和表观遗传修饰 (H3K27me3,DNA甲基化).
- 采用了肌体细胞特异的H19过度表达和体外细胞模型 (C2C12,人类骨肌细胞).
主要成果:
- 孕产妇肥胖增加了H19表达和H19-EZH2相互作用在后代的肌肉.
- H19增强了EZH2招募和H3K27me3沉积在IGF2 P3促进剂,导致高甲基化和抑制IGF2表达.
- 暴露于MO的后代表现出肌肉质量,力量,耐力和肌肉结构的改变.
- 肌体细胞中的H19过度表达抑制了IGF2信号传递,肌体发生和肌肉发育,IGF2治疗逆转了效应.
- 抑制EZH2减轻了IGF2 P3促进体的H3K27me3沉积和DNA甲基化.
结论:
- 孕产妇的肥胖症通过表观遗传抑制IGF2通过H19-EZH2轴传递信号来破坏后代的肌肉发育.
- H19-EZH2-IGF2途径调解肥胖母亲后代的长期肌肉功能障碍.
- 准H19-EZH2轴为预防或治疗MO诱导的肌肉缺陷和改善后代代谢健康提供了潜在的治疗策略.
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