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. 1990 Dec;87(24):9953–9957. doi: 10.1073/pnas.87.24.9953

Evidence that down-regulation of beta-cell glucose transporters in non-insulin-dependent diabetes may be the cause of diabetic hyperglycemia.

L Orci 1, M Ravazzola 1, D Baetens 1, L Inman 1, M Amherdt 1, R G Peterson 1, C B Newgard 1, J H Johnson 1, R H Unger 1
PMCID: PMC55292  PMID: 2263645

Abstract

Non-insulin-dependent diabetes mellitus (NIDDM) is attributed to a failure of pancreatic beta cells to maintain insulin secretion at a level sufficient to compensate for underlying insulin resistance. In the ZDF rat, a model of NIDDM that closely resembles the human syndrome, we have previously reported profound underexpression of GLUT-2, the high-Km facilitative glucose transporter expressed by beta cells of normal animals. Here we report that islets of diabetic rats exhibit a marked decrease in the volume of GLUT-2-positive beta cells and a reduction at the electron-microscopic level in the number of GLUT-2-immunoreactive sites per unit of beta-cell plasma membrane. The deficiency of GLUT-2 cannot be induced in normal beta cells by in vivo or in vitro exposure to high levels of glucose nor can it be prevented in beta cells of prediabetic ZDF rats by elimination of hyperglycemia. We conclude that this dearth of immunodetectable GLUT-2 in NIDDM is not secondary to hyperglycemia and therefore that it may well play a causal role in the development of hyperglycemia.

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Selected References

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