| First Author | Knobler H | Year | 1997 |
| Journal | Diabetes | Volume | 46 |
| Issue | 9 | Pages | 1414-8 |
| PubMed ID | 9287040 | Mgi Jnum | J:42576 |
| Mgi Id | MGI:1096000 | Doi | 10.2337/diab.46.9.1414 |
| Citation | Knobler H, et al. (1997) Impaired glucose-induced insulin response in transgenic mice overexpressing the L-phosphofructokinase gene. Diabetes 46(9):1414-8 |
| abstractText | The selective impairment of glucose-induced insulin secretion in NIDDM can be attributed to defects in the glucose-signaling system. An alteration in the activity of phosphofructokinase (PFK), a key enzyme in the glycolytic pathway, may play a role in the abnormal glucose-induced insulin secretion. In this study, we evaluated insulin secretion in transgenic (Tg) mice overexpressing the liver-type subunit of phosphofructokinase (PFKL). Three independently derived Tg-PFKL lines showed random and postprandial hyperglycemia with diminished acute insulin response following intravenous glucose tolerance load. Isolated islets of Tg-PFKL mice exhibited a shift to the right of the glucose insulin dose curve. However, the maximal insulin secretory capacity, as well as the potentiation effect by arginine, were retained. PFK activity in Tg-PFKL islets was increased by 30-70%, because of the overexpression of PFKL. Conceivably, a selective overexpression of the PFKL isoform in Tg-PFKL mice altered the enzymatic properties of the tetrameric PFK and thereby affected glucose metabolism. A similar phenomenon was previously observed in transfected PC12-PFKL cells. The data show that overexpression of PFKL in transgenic mice was associated with diminished glucose-induced insulin response and suggest a mechanism to explain the role of beta-cell PFK activity in glucose-induced insulin secretion. |
