Blood. 2001 Jan 1;97(1):221-6.

JAB/SOCS1/SSI-1 is an interleukin-2-induced inhibitor of IL-2 signaling.

Sporri B, Kovanen PE, Sasaki A, Yoshimura A, Leonard WJ.

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Laboratory of Molecular Immunology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD, USA.

Abstract

JAB/suppressor of cytokine signaling 1 (SOCS1) STAT-induced STAT inhibitor-1 (SSI-1) (JAB/SOCS1/SSI-1) is an SH2-domain-containing protein that is induced by and negatively regulates signaling by a number of cytokines including interleukin-4 (IL-4), IL-6, interferon (IFN)-gamma, prolactin, growth hormone, and erythropoietin. The role of JAB/SOCS1/SSI-1 in IL-2 signaling has been analyzed. JAB/SOCS1/SSI-1 is strongly induced by IL-2 in peripheral blood T cells, and JAB/SOCS1/SSI-1 overexpression strongly inhibits IL-2-induced signal transducer and activator of transcription-5 (Stat5) phosphorylation and transcriptional activity. In cotransfection experiments, JAB/SOCS1/SSI-1 associates with both Jak1 and Jak3; however, JAB/SOCS1/SSI-1 had a greater effect on Jak1 tyrosine phosphorylation and kinase activity. JAB/SOCS1/SSI-1 also interacts with IL-2Rbeta, and this interaction requires the A region (residues 313-382) of IL-2Rbeta. However, this interaction was not essential for the inhibitory action of JAB. Thus, JAB/SOCS1/SSI-1 is an IL-2-induced inhibitor of IL-2 signaling that functions by inhibiting Jak kinase activity. This suggests an important role for JAB/SOCS1/SSI-1 in regulating T-cell responses.

PMID:: 11133764; [PubMed - indexed for MEDLINE]

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Cited by 12 PubMed Central articles

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JAB/SOCS1/SSI-1 is an interleukin-2-induced inhibitor of IL-2 signaling.
JAB/SOCS1/SSI-1 is an interleukin-2-induced inhibitor of IL-2 signaling.
Blood. 2001 Jan 1 ;97(1):221-6.

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