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Molecular Endocrinology 13 (11): 1832-1843
Copyright © 1999 by The Endocrine Society

Mechanism of Inhibition of Growth Hormone Receptor Signaling by Suppressor of Cytokine Signaling Proteins

Johnny A. Hansen, Karen Lindberg, Douglas J. Hilton, Jens H. Nielsen and Nils Billestrup

Hagedorn Research Institute (J.A.H., K.L., J.H.N., N.B.) DK-2820 Gentofte, Denmark
The Walter and Eliza Hall Institute for Medical Research (D.J.H.) Parkville, Victoria 3052, Australia

In this study we have investigated the role of suppressor of cytokine signaling (SOCS) proteins in GH receptor-mediated signaling. GH-induced transcription was inhibited by SOCS-1 and SOCS-3, while SOCS-2 and cytokine inducible SH2-containing protein (CIS) had no effect. By using chimeric SOCS proteins it was found that the ability of SOCS proteins to inhibit GH-mediated transcription was located in the amino-terminal 40–80 amino acids. In SOCS-3, 46 amino acids C-terminal to the SH2 domain were required for the inhibitory activity, while a truncated SOCS-1 having only 2 amino acids C-terminal to the SH2 domain was able to inhibit GH-mediated transcription. Both SOCS-1 and SOCS-3 were able to inhibit GH-induced STAT5 (signal transducer and activator of transcription) activation. SOCS-1 inhibited the tyrosine kinase activity of Janus kinase 2 (JAK2) directly, while SOCS-3 only inhibited JAK2 when stimulated by the GH receptor. All four SOCS proteins were able to bind to a tyrosine-phosphorylated glutathione-S-transferase-GH receptor fusion protein, and SOCS-3 required the same 46 C-terminal amino acids for GH receptor binding as it did for inhibition of GH-mediated transcription and STAT5 activation. These data suggest that SOCS-1 and -3 can suppress GH-induced transcriptional activity, presumably by inhibiting the kinase activity of JAK2 either directly in the case of SOCS-1 or via binding to the tyrosine-phosphorylated GH receptor in the case of SOCS-3.




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