葡萄糖是哺乳类动物细胞的主要能量来源 ,脑的氧化代谢需要葡萄糖的持续供给。葡萄糖通过质膜的转运依赖于两种不同机制 ,一种为Ｎａ+ -葡萄糖偶联转运体 ,依赖于Ｎａ+ 电化学梯度 ,需消耗能量 ,主要在小肠顶缘和肾上皮表达 ;另一种由易化葡萄糖转运蛋白 (ＧＬＵＴ)所介导 ,不 Glucose is the main source of energy for mammalian cells and the oxidative metabolism of the brain requires the continued supply of glucose. Glucose transport through the plasma membrane depends on two different mechanisms, one is Na + - glucose coupled transporter, depending on the Na + electrochemical gradient, energy consumption, mainly in the top of the small intestine and renal epithelial expression; the other Mediated by facilitated glucose transporter (GLUT), no