在人类葡萄糖代谢中,CHC22克拉林重链异型的作用
Stéphane Vassilopoulos1, Christopher Esk, Sachiko Hoshino
1Department of Bioengineering and Therapeutic Sciences, University of California, School of Pharmacy, San Francisco (UCSF), San Francisco, CA 94143, USA.
概括
克拉特林重链异型CHC22对于对胰岛素敏感的GLUT4在人体肌肉和脂肪中的运输至关重要. 它的功能障碍与2型糖尿病有关,突出了特定物种的途径.
科学领域:
- 细胞生物学 细胞生物学
- 分子内分泌学分子内分泌学
- 代谢性疾病是一种代谢性疾病.
背景情况:
- 胰岛素刺激葡萄糖载体4型 (GLUT4) 转移到肌肉和脂肪细胞中的血膜.
- 克拉特林是一种参与细胞内贩运的蛋白质,在这个过程中发挥着作用.
- 克拉特林重链异型CHC22在人类骨肌肉中高度表达.
研究的目的:
- 研究CHC22在GLUT4贩运和人类肌肉和脂肪细胞中的胰岛素反应中的作用.
- 探索CHC22与2型糖尿病的关联.
- 在哺乳动物模型中确定CHC22的功能意义.
主要方法:
- 免疫组织化学和细胞成像分析GLUT4和CHC22在人体组织和细胞中的定位.
- 在小鼠中进行基因操纵,以评估CHC22引入对葡萄糖代谢和GLUT4贩运的影响.
- 生物化学测试用于研究蛋白质相互作用.
主要成果:
- 在人体肌肉和脂肪细胞中,CHC22对于形成对胰岛素敏感的GLUT4区块至关重要.
- 增加CHC22表达与2型糖尿病患者肌肉中扩大的GLUT4区间相关.
- 在小鼠中引入CHC22导致GLUT4的异常贩运和类似糖尿病的特征.
结论:
- 依赖CHC22的膜贩运是一种对人类葡萄糖平衡至关重要的物种特异性途径.
- CHC22的失调可能会导致2型糖尿病的发病.
- 向CHC22可能为代谢障碍提供新的治疗策略.
相关概念视频
Glucose Transporters
Glucose transporters facilitate the transport of glucose across the cell membrane. In addition to glucose, some glucose transporters can also aid the movement of other hexoses such as fructose, mannose, and galactose.
Facilitated diffusion-glucose transporters (GLUTs) are encoded by the solute-linked carrier (SLC) family 2, subfamily A gene family, or SLC2A. The 14 GLUT protein members are distributed into three classes:
Facilitated diffusion-glucose transporters (GLUTs) are encoded by the solute-linked carrier (SLC) family 2, subfamily A gene family, or SLC2A. The 14 GLUT protein members are distributed into three classes:
Glucose Homeostasis: Regulation of Blood Glucose
Carbohydrates consumed through foods are converted into glucose, a crucial energy source for the body. In the prandial state, high blood glucose levels stimulate the secretion of insulin from the pancreas. Insulin inhibits hepatic glucose production and stimulates glucose uptake and metabolism by muscle and adipose tissue. The excess glucose is converted into glycogen and stored in the liver and muscles.
During fasting, when blood glucose levels are low, the pancreas secretes glucagon. it...
During fasting, when blood glucose levels are low, the pancreas secretes glucagon. it...
Glucose 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...
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Membrane Proteins
Plasma membranes have integral transmembrane proteins involved in facilitated transport. These proteins are collectively referred to as transport proteins, and they function as either channels for the material or as carriers themselves. Channel proteins have hydrophilic domains exposed to the intracellular and extracellular fluids and a hydrophilic channel through their core that provides a hydrated opening for solutes to pass through the membrane layers. Passage through the channel allows...
Glucose Absorption Into the Small Intestine
Complex carbohydrates consumed cannot be absorbed into the small intestine in their original form. First, they must be hydrolyzed to a monosaccharide form such as glucose or galactose. These monosaccharides are then transported across the intestinal membrane and into the blood via transcellular transport. The intestinal epithelial cells allow the movement of these monosaccharides with a defined 'entry' through membrane transporter proteins present on their apical membrane and 'exit' via the...
Overview of Carbohydrate Metabolism
Carbohydrate metabolism is a fundamental biochemical process that ensures a constant supply of energy to living cells. The most important carbohydrate is glucose, which can be broken down via glycolysis to enter into the Krebs cycle and eventually lead to the production of ATP through oxidative phosphorylation.
Glucose transport into cells is facilitated by a family of transport proteins called GLUT (Glucose Transporters). GLUT4 is the primary glucose transporter for insulin-stimulated glucose...
Glucose transport into cells is facilitated by a family of transport proteins called GLUT (Glucose Transporters). GLUT4 is the primary glucose transporter for insulin-stimulated glucose...


