长时间暴露于胰岛素可能会导致表观遗传改变,导致胰岛素耐药性
Shehnaz Bano1,2, Shyam More1,2, Dattatray S Mongad1
1National Centre for Cell Science, Pune, India.
FEBS open bio
|October 29, 2024
概括
在没有高葡萄糖的情况下,长时间暴露于胰岛素会通过损害PI3K/AKT信号来引起胰岛素抵抗. 这种胰岛素抵抗与表观遗传变化有关,可以通过表观遗传修饰剂逆转.
科学领域:
- 代谢研究的研究.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 蜂信号传输是如何进行的
背景情况:
- 胰岛素对葡萄糖平衡至关重要,但胰岛素抵抗 (IR) 的机制尚未完全理解.
- 超胰岛素血症往往是IR和2型糖尿病的先发症.
- 以前的研究表明,长时间暴露于胰岛素而没有高葡萄糖会在细胞中诱导IR.
研究的目的:
- 研究因长时间暴露于胰岛素而引起的胰岛素抵抗的分子机制.
- 探索表观遗传改变在维持胰岛素耐药性的作用.
- 为了验证肝细胞系和小鼠模型中的发现.
主要方法:
- 长期暴露于胰岛素的胰岛素反应细胞和BRL-3A肝细胞没有高葡萄糖.
- 对PI3K/AKT通路的分析.
- 转录基因分析.转录基因分析.
- 历史素修饰分析 (H3K4me3).
- 在体内研究中,小鼠在禁食期间注射低剂量胰岛素.
主要成果:
- 在没有高葡萄糖的情况下长时间暴露于胰岛素导致通过PI3K/AKT通路的胰岛素信号受损.
- 抗胰岛素在几代人中一直存在,并由表观遗传修饰剂逆转,这表明表观遗传参与.
- 转录组分析揭示了染色体重塑,Rho GTPases和无处不在的改变网络.
- 在胰岛素耐药细胞中观察到氨酸4 (H3K4me3) 时素H3三甲基化增加.
- 在禁食期间暴露于低剂量胰岛素的小鼠产生了胰岛素耐药性,降低了葡萄糖耐受性和增加了HOMA-IR.
结论:
- 在没有葡萄糖刺激的情况下,失调的胰岛素合成可以诱导表观遗传变化,导致胰岛素抵抗.
- PI3K/AKT通路是这种胰岛素抵抗的关键媒介.
- 表观遗传修饰在胰岛素抵抗的发展和维持中起着重要作用.
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