Stimulation of tyrosine-Specific phosphorylation in vitro by insulin-Like growth factor I

Joshua B. Rubin, Michael A. Shia, Paul F. Pilch

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157 Scopus citations


Several mitogens elicit tyrosine-specific protein kinase activities 1-7. Although the physiological significance of this is unclear, the generality of these reactions implies that this may be an inherent feature of growth factor-growth factor receptor interactions. The observed mitogenic properties of the polypeptide insulin-like growth factor I (IGF-I)8,9 indicated that it might also stimulate such activity. We report here that IGF-I stimulates a tyrosine-specific protein kinase in a time- and dose-dependent fashion. The close correspondence between an approximate 50% effective dose (ED50) of phosphorylation and an approximate Kd for IGF-I binding leads us to conclude that a high-affinity IGF-I receptor, not the structurally similar insulin receptor10, is the mediator of IGF-I-stimulated kinase activity. Immunoprecipitation indicates that both the β-subunit of the IGF-I receptor and the β-subunit of the insulin receptor are targets for the IGF-I-stimulated protein kinase.

Original languageEnglish
Pages (from-to)438-440
Number of pages3
Issue number5933
StatePublished - 1983


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