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J. Biol. Chem., Vol. 277, Issue 2, 1076-1084, January 11, 2002

This Article Full Text Full Text (PDF) All Versions of this Article: 277/2/1076    most recent M108415200v1 Submit a Letter to Editor Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Request Permissions Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Poy, M. N. Articles by Najjar, S. M. Search for Related Content PubMed PubMed Citation Articles by Poy, M. N. Articles by Najjar, S. M. Social Bookmarking                      What's this?

Shc and CEACAM1 Interact to Regulate the Mitogenic Action of Insulin^*

Matthew N. Poy^§, Randall J. Ruch^¶, Mats A. Fernström, Yoshinori Okabayashi, and Sonia M. Najjar^**

From the  Departments of Pharmacology and Therapeutics and ^¶ Pathology, Medical College of Ohio, Toledo, Ohio 43614 and the  Second Department of Internal Medicine, Kobe University School of Medicine, Kobe 650, Japan

CEACAM1, a tumor suppressor (previously known as pp120), is a plasma membrane protein that undergoes phosphorylation on Tyr⁴⁸⁸ in its cytoplasmic tail by the insulin receptor tyrosine kinase. Co-expression of CEACAM1 with insulin receptors decreased cell growth in response to insulin. Co-immunoprecipitation experiments in intact NIH 3T3 cells and glutathione S-transferase pull-down assays revealed that phosphorylated Tyr⁴⁸⁸ in CEACAM1 binds to the SH2 domain of Shc, another substrate of the insulin receptor. Overexpressing Shc SH2 domain relieved endogenous Shc from binding to CEACAM1 and restored MAP kinase activity, growth of cells in response to insulin, and their colonization in soft agar. Thus, by binding to Shc, CEACAM1 sequesters this major coupler of Grb2 to the insulin receptor and down-regulates the Ras/MAP kinase mitogenesis pathway. Additionally, CEACAM1 binding to Shc enhances its ability to compete with IRS-1 for phosphorylation by the insulin receptor. This leads to a decrease in IRS-1 binding to phosphoinositide 3'-kinase and to the down-regulation of the phosphoinositide 3'-kinase/Akt pathway that mediates cell proliferation and survival. Thus, binding to Shc appears to constitute a major mechanism for the down-regulatory effect of CEACAM1 on cell proliferation.

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