Mechanism of IGF-I-stimulated glucose transport in human adipocytes. Demonstration of specific IGF-I receptors not involved in stimulation of glucose transport.

Abstract:

:We demonstrate the presence of specific insulinlike growth factor I (IGF-I) receptors in human adipocytes. Competition studies with 125I-labeled IGF-I and unlabeled IGF-I, IGF-II, and insulin showed the specificity of 125I-IGF-I binding to the IGF-I receptors in adipocytes, membranes, and partially purified detergent-solubilized extracts. The monoclonal antibody to the IGF-I receptor (alpha-IR3) inhibits 125I-IGF-I binding and immunoprecipitates the IGF-I receptor. In addition, the alpha-subunit of IGF-I receptor is approximately 10,000 Mr larger than the alpha-subunit of insulin receptor, and IGF-I stimulates phosphorylation of the beta-subunit of the IGF-I receptor. IGF-I stimulates basal glucose transport in human adipocytes, but the concentrations of IGF-I required for half-maximal and maximal stimulation of glucose transport are 800- and 1000-fold greater than that of insulin. The possibility of IGF-I stimulating glucose transport by interacting predominantly with insulin receptors is suggested by data showing that 1) IGF-I competes with insulin-binding sites, 2) there is a lack of an additive effect with IGF-I and insulin in stimulating glucose transport, 3) alpha-IR3, which specifically inhibits IGF-I binding, does not inhibit IGF-I or insulin-stimulated glucose transport, 4) insulin-receptor antibody MA-10 inhibits IGF-I and insulin-stimulated glucose transport, and 5) IGF-I stimulates insulin-receptor autophosphorylation, although its effect is markedly decreased compared with insulin. In summary, human adipocytes possess specific IGF-I receptors. However, IGF-I stimulates glucose transport predominantly by interacting with the insulin receptor.

journal_name

Diabetes

journal_title

Diabetes

authors

Sinha MK,Buchanan C,Leggett N,Martin L,Khazanie PG,Dimarchi R,Pories WJ,Caro JF

doi

10.2337/diab.38.10.1217

subject

Has Abstract

pub_date

1989-10-01 00:00:00

pages

1217-25

issue

10

eissn

0012-1797

issn

1939-327X

journal_volume

38

pub_type

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