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Science 16 June 1978:
Vol. 200. no. 4347, pp. 1283 - 1284
DOI: 10.1126/science.663609
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Articles

Science, Vol 200, Issue 4347, 1283-1284
Copyright © 1978 by American Association for the Advancement of Science

articles

Antibodies to purified insulin receptor have insulin-like activity

S Jacobs, KJ Chang, and P Cuatrecasas

Antibodies to insulin receptors purified from rat liver membranes do not complete with [125I]insulin for binding to the insulin receptor but do precipitate solubilized receptors labeled with [125I]insulin. These antibodies have the insulin-like activities of enhancing glucose oxidation and inhibiting epinephrine-induced lipolysis in rat adipocytes. Thus, antibody binds to the receptor at a different site from that to which insulin binds, yet the interaction can initiate an effective biological response. These results indicate that the previously studied insulin-binding sites are the physiological macromolecular receptors for insulin.


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