损失的Notch二元化扰乱肠道平衡通过一个机制涉及HDAC活动的机制
Quanhui Dai1,2, Kristina Preusse2, Danni Yu1
1State Key Laboratory of Genetic Engineering, School of Life Sciences, Greater Bay Area Institute of Precision Medicine (Guangzhou), Zhongshan Hospital, Fudan University, Shanghai, China.
PLoS genetics
|December 12, 2024
概括
缺口受体二分化对于维持肠道干细胞功能和免疫反应至关重要. 抑制HDAC2活动可以防止因Notch通路功能障碍引起的肠损伤.
科学领域:
- 细胞生物学 细胞生物学
- 发展生物学 发展生物学
- 免疫学 免疫学 免疫学
背景情况:
- 诺奇信号通路调节细胞与细胞之间的通信,这对于发育和组织平衡至关重要.
- 划分受体 (Notch1-4) 与DNA结合蛋白相互作用,以控制基因转录.
- 诺奇受体的二元化影响其功能,但其在肠道干细胞中的特定作用尚未完全理解.
研究的目的:
- 研究诺奇受体二分化在肠道干细胞维护和对环境侮辱的反应中的作用.
- 探索背后的分子机制 口二分化缺陷 (NDD) 现象型.
- 确定HDAC2活动是否调节Notch功能并导致肠道病理.
主要方法:
- 产生和分析具有Notch1和Notch2二分化缺陷等位基因的小鼠 (NDD小鼠).
- 结肠球状体的转录组分析,以评估基因表达变化.
- 随后进行了质谱测量,以研究人类结肠癌细胞中的蛋白质相互作用.
- 使用酸 (VPA) 抑制HDAC2的药理抑制在小鼠和球形动物中.
主要成果:
- NDD小鼠对环境侮辱具有高度敏感性,体外干细胞维护功能受损,以及先天免疫反应特征升高.
- 转录组分析没有发现二分体依赖的基因错调,但证实了干细胞缺陷.
- 质谱学显示,二分化缺陷的Notch2 (NOTCH2DD) 的蛋白相互作用发生变化,与转录机制的相互作用减少,但与HDAC2.2的相互作用保持.
- 通过VPA抑制HDAC2,改善了小鼠和球状体中NDD和玛分泌酶抑制剂 (DBZ,DAPT) 的肠道后果.
结论:
- 缺口受体二分化对于肠干细胞平衡和适当的免疫反应至关重要.
- 在Notch功能丧失的表型中,HDAC2活动起着重要作用,可能是通过调节Notch协作性.
- 准HDAC2活动可能为与Notch通路功能障碍相关的肠道疾病提供治疗策略.
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