title: The inhibition of interleukin-6-dependent STAT activation by mitogen-activated protein kinases depends on tyrosine 759 in the cytoplasmic tail of glycoprotein 130.
abstract: Mitogen-activated protein (MAP) kinases stimulated by phorbol 13-myristate 12-acetate (PMA) have been shown to inhibit interleukin-6-induced activation of STAT3 (Sengupta, T. K., Talbot, E. S., Scherle, P. A., and Ivashkiv, L. B. (1998) Proc. Natl. Acad. Sci. U. S. A. 95, 11107-11112). In the present study we demonstrate that in addition to STAT3, also tyrosine phosphorylation of STAT1, signal transducer gp130, and phosphotyrosine-phosphatase SHP2 underlies negative regulation by MAP kinases. Stimulation of Erks by basic fibroblast growth factor or a constitutively active mutant of Raf also led to down-regulation of STAT activity. Using chimeric receptor mutants we show that tyrosine 759 of glycoprotein 130 is crucial for the inhibitory effect of MAP kinases. Inhibition is also dependent on gene transcription and translation indicating that newly synthesized proteins are involved. Both PMA and basic fibroblast growth factor rapidly stimulate mRNA expression of the suppressor of cytokine signaling-3 (SOCS-3) and this induction is strongly reduced by an inhibitor of MAP kinase activation. Together with recent results demonstrating that SOCS-3 can bind in vitro to a phosphorylated tyrosine 759 peptide of glycoprotein 130 these data suggest SOCS-3 to be instrumental in the inhibition of the Janus kinase/STAT pathway by MAP kinases.
authors.affiliation: Institut für Biochemie and Interdisziplinäres Zentrum für Klinische Forschung "Biomat.," RWTH Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Terstegen
authors.forename: P
authors.initials: P
authors.lastname: Gatsios
authors.forename: J G
authors.initials: JG
authors.lastname: Bode
authors.forename: F
authors.initials: F
authors.lastname: Schaper
authors.forename: P C
authors.initials: PC
authors.lastname: Heinrich
authors.forename: L
authors.initials: L
authors.lastname: Graeve
mesh_terms: D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D003593:Cytoplasm / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism; D016222:Fibroblast Growth Factor 2 / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D015850:Interleukin-6 / Q000378:metabolism*; D051907:Lysosomal Membrane Proteins; D008562:Membrane Glycoproteins / Q000737:chemistry / Q000378:metabolism*; D051379:Mice; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D009838:Oligodeoxyribonucleotides; D011506:Proteins / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D012097:Repressor Proteins; D050794:STAT1 Transcription Factor; D050796:STAT3 Transcription Factor; D000071223:Suppressor of Cytokine Signaling 3 Protein; D050826:Suppressor of Cytokine Signaling Proteins; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D015534:Trans-Activators / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism; D014157:Transcription Factors; D014443:Tyrosine / Q000378:metabolism*; D052118:Lysosomal-Associated Membrane Protein 1
chemical_list: D004268:DNA-Binding Proteins; D016222:Fibroblast Growth Factor 2; D015850:Interleukin-6; D051907:Lysosomal Membrane Proteins; D008562:Membrane Glycoproteins; D020928:Mitogen-Activated Protein Kinases; D009838:Oligodeoxyribonucleotides; D011506:Proteins; D012333:RNA, Messenger; D012097:Repressor Proteins; D050794:STAT1 Transcription Factor; D050796:STAT3 Transcription Factor; D000071223:Suppressor of Cytokine Signaling 3 Protein; D050826:Suppressor of Cytokine Signaling Proteins; D013755:Tetradecanoylphorbol Acetate; D015534:Trans-Activators; D014157:Transcription Factors; D014443:Tyrosine; C489116:LAMP1 protein, human; D052118:Lysosomal-Associated Membrane Protein 1; C052255:Lamp1 protein, mouse; C106644:SOCS3 protein, human; C494079:STAT1 protein, human; C494086:STAT3 protein, human; C491411:Socs3 protein, mouse; C494080:Stat1 protein, mouse; C494087:Stat3 protein, mouse