在人类2型糖尿病中,ARNT/HIF1beta转基因表达变化和胰岛岛功能障碍的损失介导着ARNT/HIF1beta的损失
Jenny E Gunton1, Rohit N Kulkarni, SunHee Yim
1Joslin Diabetes Center and Harvard Medical School, 1 Joslin Place, Boston, Massachusetts 02215, USA.
Cell
|August 13, 2005
概括
转录因子ARNT水平的降低会损害葡萄糖刺激的胰岛素释放,并导致2型糖尿病中的β细胞功能障碍. 这一发现突出了ARNT的ARNT.
科学领域:
- 分子生物学分子生物学
- 内分泌学 在内分泌学.
- 遗传学 是一个遗传学.
背景情况:
- 贝塔细胞功能障碍是2型糖尿病病原体的核心.
- 胰腺小岛的基因表达改变与糖尿病有关.
研究的目的:
- 研究基因表达变化的作用,特别是转录因子ARNT在人类2型糖尿病中的作用.
- 阐明降低ARNT水平对β细胞功能和葡萄糖平衡的功能影响.
主要方法:
- 从2型糖尿病患者和对照对象的人类胰腺小岛上采用寡头核酸微阵列和实时PCR.
- 小干扰RNA (siRNA) 用于降低Min6细胞中的ARNT水平.
- 产生β细胞特异性ARNT淘汰小鼠.
主要成果:
- 在2型糖尿病人群岛中观察到ARNT表达 (90%) 和其他关键β细胞基因 (HNF4alpha,胰岛素受体,IRS2,Akt2) 的显著下降.
- 在Min6细胞中减少的ARNT损害了葡萄糖刺激的胰岛素释放,改变了基因表达特征.
- 贝塔细胞特异性ARNT淘汰赛小鼠表现出葡萄糖耐受性受损,胰岛素分泌量减少和基因表达变化,反映出人类糖尿病岛屿.
结论:
- 减少ARNT表达是人类2型糖尿病的一个重要发现.
- 降低ARNT水平导致β细胞功能受损和葡萄糖失调.
- 由减少的ARNT驱动的改变基因表达,在2型糖尿病病理生理学中起着关键作用.
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