Differential regulation of the alpha/beta interferon-stimulated Jak/Stat pathway by the SH2 domain-containing tyrosine phosphatase SHPTP1.
Interferons (IFNs) induce early-response genes by stimulating Janus family (Jak) tyrosine kinases, leading to tyrosine phosphorylation of Stat transcription factors. Previous studies implicated protein-tyrosine phosphatase (PTP) activity in the control of IFN-regulated Jak/Stat signaling, but the specific PTPs responsible remained unidentified. We have found that SH2 domain-containing PTP1 (SHPTP1; also called PTP1C, HCP, or SHP) reversibly associates with the IFN-alpha receptor complex upon IFN addition. Compared with macrophages from normal littermate controls, macrophages from motheaten mice, which lack SHPTP1, show dramatically increased Jak1 and Stat1 alpha tyrosine phosphorylation, whereas Tyk2 and Stat2 activation is largely unaffected. These findings correlate with selectively increased complex formation on a gamma response element, but not an IFN-stimulated response element, in motheaten macrophages. Our results establish that SHPTP1 selectively regulates distinct components of Jak/Stat signal transduction pathways in vivo.
David
M
M
Division of Cytokine Biology, Center for Biologics Evaluation and Research, Bethesda, Maryland 20892, USA.
Chen
H E
HE
Goelz
S
S
Larner
A C
AC
Neel
B G
BG
D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D004268:DNA-Binding Proteins / Q000302:isolation & purification / Q000378:metabolism*; D005786:Gene Expression Regulation / Q000187:drug effects*; D007370:Interferon Type I / Q000494:pharmacology*; D047908:Intracellular Signaling Peptides and Proteins; D053613:Janus Kinase 1; D008264:Macrophages / Q000187:drug effects / Q000201:enzymology / Q000276:immunology; D051379:Mice; D008809:Mice, Inbred C3H; D008817:Mice, Mutant Strains; D008969:Molecular Sequence Data; D009838:Oligodeoxyribonucleotides; D011401:Promoter Regions, Genetic; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases / Q000302:isolation & purification / Q000378:metabolism*; D011505:Protein-Tyrosine Kinases / Q000302:isolation & purification / Q000378:metabolism*; D054593:SH2 Domain-Containing Protein Tyrosine Phosphatases; D050795:STAT2 Transcription Factor; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology*; D015534:Trans-Activators / Q000302:isolation & purification / Q000378:metabolism*
D004268:DNA-Binding Proteins; D007370:Interferon Type I; D047908:Intracellular Signaling Peptides and Proteins; D009838:Oligodeoxyribonucleotides; D050795:STAT2 Transcription Factor; C494085:Stat2 protein, mouse; D015534:Trans-Activators; D011505:Protein-Tyrosine Kinases; C507905:Jak1 protein, mouse; D053613:Janus Kinase 1; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases; C516725:Ptpn11 protein, mouse; C509248:Ptpn6 protein, mouse; D054593:SH2 Domain-Containing Protein Tyrosine Phosphatases