在Abcb11内部的一个增强器调节C57BL/6小鼠胰腺小岛中的G6pc2
Mark P Keller1, Emily M Hawes2, Kathryn L Schueler1
1Department of Biochemistry, University of Wisconsin-Madison, Madison, WI.
Diabetes
|August 8, 2023
概括
研究人员确定了一种新的增强器区域,该区域调节胰腺小岛中的葡萄糖-6-酸酶催化子单元2 (G6PC2) 表达. 删除这种增强剂部分降低了G6PC2,增强胰岛素分泌而不会改变禁食血糖水平.
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:
- G6PC2是一种葡萄糖-6-酸酶催化子单元,通过调节胰腺β细胞的胰岛素分泌敏感性,对调节禁食血糖 (FBG) 起至关重要的作用.
- 单独的G6pc2促进剂对于持续的小岛特异性表达是不够的,这表明远端调节元件的作用.
研究的目的:
- 识别和描述调节G6pc2表达的远端增强剂.
- 研究一种特定增强剂 (增强剂I) 对G6pc2表达和葡萄糖平衡的功能影响.
主要方法:
- 对人类和小鼠G6PC2位点进行生物信息分析,以确定假定增强剂.
- 在C57BL/6小鼠中通过CRISPR中介删除增强剂I.
- 在孤立的岛屿中对基因表达的分析和在体内评估葡萄糖耐受性和FBG.
主要成果:
- 确定了位于Abcb11的第25个内子中的一个新增增强器区域 (增强器I),结合了以小岛丰富的转录因子.
- 在小鼠中,CRISPR删除增强剂I导致G6pc2表达在孤立的小岛中减少了50%左右.
- 部分G6pc2降低增强了基础胰岛素分泌,但在体内没有影响FBG或葡萄糖耐受性.
结论:
- 远端增强剂在调节胰腺小岛中的G6pc2表达方面发挥着重要作用.
- 向增强剂I或类似的调节元件可能为调节胰岛素分泌和葡萄糖代谢提供治疗潜力.
更多相关视频
07:44Surgical Injury to the Mouse Pancreas through Ligation of the Pancreatic Duct as a Model for Endocrine and Exocrine Reprogramming and Proliferation
Published on: August 7, 2015
16.3K
09:23Efficient Differentiation of Pluripotent Stem Cells to NKX6-1+ Pancreatic Progenitors
Published on: March 7, 2017
8.0K
相关概念视频
01:58Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
01:05Insulin Secretory Vesicles
Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...
01:27Glucose Homeostasis: Pancreatic Islets and Insulin Secretion
The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
Insulin and C-peptide are co-secreted in...
Insulin and C-peptide are co-secreted in...