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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1989 Apr;86(8):2642–2646. doi: 10.1073/pnas.86.8.2642

Activation of glucose uptake by insulin and insulin-like growth factor I in Xenopus oocytes.

M Janicot 1, M D Lane 1
PMCID: PMC286973  PMID: 2649887

Abstract

Xenopus laevis oocytes possess a glucose transport system that is activated 3- to 5-fold by insulin-like growth factor I (Ka = 3 nM) and insulin (Ka = 200-250 nM), properties suggesting activation mediated by an insulin-like growth factor I receptor. This activation increases the Vmax of hexose uptake and has little or no effect on the Km for deoxyglucose (Km = 1-2 mM). Activation by hormone requires about 60 min and is inhibited by cytochalasin B but not by cycloheximide. The dependence of hexose uptake rate on hexose concentration exhibits cooperativity with Hill coefficients of 1.8 and 1.4 for the basal and hormone-activated states, respectively. Microinjection of a monoclonal antibody directed against the tyrosine kinase domain of the human insulin receptor blocks activation of hexose uptake by insulin-like growth factor I and insulin but has no effect on basal uptake. Taken together the results implicate the tyrosine-specific protein kinase activity of a cell-surface insulin-like growth factor I receptor in the activation of glucose transport in the Xenopus oocyte.

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Selected References

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