胰腺β细胞功能和基因表达的动态调节由SND1核心调节器进行in vitro
Sukrati Kanojia1,2,3, Rebecca K Davidson1,2,3, Jason M Conley2,3,4
1Department of Biochemistry & Molecular Biology, Indiana University School of Medicine, Indianapolis, IN, USA.
Islets
|October 15, 2023
概括
研究人员确定了葡萄球菌核酶和Tudor域含有蛋白质 (SND1) 作为胰腺和十二指肠本体箱1 (PDX1) 的关键合作伙伴. 这种相互作用对胰岛素分泌至关重要,并且在2型糖尿病中受损.
科学领域:
- 内分泌学 在内分泌学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 胰腺β细胞通过合成和分泌胰岛素来调节血糖.
- 糖尿病导致β细胞功能障碍和PDX1.1等重要转录因子的丧失.
- 通过相互作用的转录性核心调节器调节PDX1活性.
研究的目的:
- 为了确定PDX1.1的新型相互作用伙伴.
- 研究PDX1:SND1复合体在β细胞功能中的作用.
- 确定这种相互作用在2型糖尿病病原发生的相关性.
主要方法:
- 在动物和人类β细胞模型中确认PDX1:SND1相互作用.
- 在CRISPR-Cas9基因编辑中删除小鼠β细胞系中的Snd1基因.
- 对基因表达,细胞增殖,cAMP积累和胰岛素分泌的分析.
主要成果:
- 在β细胞中SND1缺乏导致与胰岛素分泌和细胞增殖相关的基因表达改变,包括减少GLP1R.
- 缺少SND1的β细胞表现出扩张速度受损,GLP1R水平降低,cAMP积累减少,胰岛素分泌减少.
- 在2型糖尿病捐赠者的人类β细胞中,PDX1:SND1相互作用显著减少.
结论:
- PDX1:SND1复合体对于调节β细胞功能必不可少的基因至关重要.
- 在维护β细胞胰岛素分泌和增殖方面,SND1发挥着至关重要的作用.
- 破坏PDX1:SND1相互作用与2型糖尿病的发病有关.
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