Monoclonal antibody alpha IR-3 inhibits the ability of insulin-like growth factor II to stimulate a signal from the type I receptor without inhibiting its binding.

Abstract:

:We have previously shown that the protein encoded by a human insulin-like growth factor I (IGF-I) receptor cDNA binds both IGF-I and II with high affinity. In the present studies, we show that a monoclonal antibody to the IGF-I receptor, alpha IR-3, inhibits the binding of IGF-I but not IGF-II to the expressed receptor in intact cells and after solubilization. Surprisingly, this monoclonal antibody inhibits the ability of both IGF-I and II to stimulate thymidine synthesis in cells with the expressed receptor. Moreover, this antibody inhibits the ability of both IGF-I and II to stimulate the kinase activity of the IGF-I receptor in intact cells. These results indicate that alpha IR-3 binds to the IGF-I receptor in such a way that it does not inhibit the binding of IGF-II but does inhibit the subsequent ability of the receptor to be activated to transmit a signal.

authors

Steele-Perkins G,Roth RA

doi

10.1016/0006-291x(90)90819-9

subject

Has Abstract

pub_date

1990-09-28 00:00:00

pages

1244-51

issue

3

eissn

0006-291X

issn

1090-2104

pii

0006-291X(90)90819-9

journal_volume

171

pub_type

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