PMID: 19912805Jun 1, 1991Paper

Glucose transporter gene expression in rat brain: Pretranslational changes associated with chronic insulin-induced hypoglycemia, fasting, and diabetes

Molecular and Cellular Neurosciences
L KoranyiM A Permutt

Abstract

Steady-state levels of the major glucose transporter gene (GLUT-1) of the brain were evaluated under three conditions that induced chronic changes in plasma glucose and insulin in adult rats: (i) repeated injection of insulin for 5 days, resulting in plasma glucose levels of 60-70 mg/dl for at least 3 days; (ii) fasting for 3 days; and (iii) moderate streptozotocin-induced diabetes of 1 week duration. Brain GLUT-1 mRNA was measured by dot blot hybridization with a HepG2/erythrocyte (GLUT1) [(32)P]cRNA probe, and GLUT-1 protein by immunoblot analysis with a polyclonal antibody (11493). Insulin injection resulted in hypoglycemia, increased GLUT-1 mRNA (143 +/- 15%, P < 0.05), and increased GLUT-1 protein (141 +/- 6%, P < 0.05). The increase in GLUT-1 mRNA was specific for brain, as no change was observed in liver or kidney. Fasting resulted in mild hypoglycemia, lower plasma insulin, increased GLUT-1 mRNA (131 +/- 17%, P < 0.05 vs control), and no change in GLUT-1 protein (125 +/- 9%, N.S.). Mild streptozotocin diabetes resulted in hyperglycemia, undetectable plasma insulin, decreased GLUT-1 mRNA (65 +/- 6%, P < 0.05 vs control), and no change in GLUT-1 protein (84 +/- 9%, N.S.). A negative correlation (r = -0.61, P < .0001) betw...Continue Reading

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