通过HuR控制帕内斯细胞功能,通过改变干细胞活性来调节肠道粘膜的生长
Lan Xiao1, Bridgette Warner1, Caroline G Mallard1
1Cell Biology Group, Department of Surgery, University of Maryland School of Medicine, Baltimore, MD, USA.
Life science alliance
|September 11, 2023
概括
RNA结合蛋白 HuR 通过维持 Paneth 细胞 (PC) 利基信号,对肠道干细胞 (ISC) 功能至关重要. 被破坏的HuR会损害PC/ISC的利基完整性,导致肠道粘膜缩.
科学领域:
- 胃肠病学 胃肠病学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 肠干细胞 (ISC) 驱动上皮细胞的更新,依赖于来自密码基的帕内斯细胞 (PC) 的信号.
- 个人电脑提供了重要的利基因素,调节ISC的扩散和功能.
研究的目的:
- 研究RNA结合蛋白HuR在调节帕内斯细胞功能中的作用及其对肠干细胞活性和粘膜生长的影响.
- 探索HuR,线粒体功能和肠粘膜缩的病变发生之间的联系.
主要方法:
- 在小鼠肠表皮中向删除HuR.
- 在帕内斯细胞中分析基因表达特征.
- 评估ISC功能和肠上皮的更新.
- 检查患有严重手术疾病的患者的人类肠道粘膜.
- 通过microRNA-195.5对HuR通过microRNA-195.5对禁忌素1 (PHB1) 表达的调节进行研究.
主要成果:
- 在小鼠中的HuR缺失破坏了PC基因表达,减少了利基因素,并损害了ISC功能,抑制了肠道上皮的更新.
- 组织HuR水平降低和PC/ISC利基功能障碍在患有关键外科手术疾病的患者的人类肠道粘膜中观察到.
- 通过减少与线粒体相关的蛋白质,如PHB1.1,HuR删除会损害线粒体功能.
- 通过抑制microRNA-195与Phb1mRNA结合,HuR促进PHB1的表达.
结论:
- HuR对于维护帕内斯细胞/肠干细胞的完整性至关重要.
- 缺陷的PC/ISC位功能,受HuR和线粒体完整性的影响,在肠粘膜缩的发病过程中起着重要作用.
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