Document Detail

Induction of Jak/STAT signaling by activation of the type 1 TNF receptor.
MedLine Citation:
PMID:  9510175     Owner:  NLM     Status:  MEDLINE    
Cellular responses to TNF are initiated by either of two cell surface receptors, the type 1 TNF receptor (TNFR1) and the type 2 TNF receptor (TNFR2). Although neither receptor contains an intrinsic protein tyrosine kinase, such activity has been implicated in TNF action. In this study, we show that murine TNF induces the tyrosine phosphorylation and activation of the intracellular Janus tyrosine kinases Jak1, Jak2, and Tyk2 in murine 3T3-L1 adipocytes. Activation of Jak kinases by TNF was associated with tyrosine phosphorylation of STAT1, STAT3, STAT5, and STAT6, but not STAT2 or STAT4, showing that TNF acts on a specific subset of these latent cytoplasmic transcription factors in 3T3-L1 adipocytes. Agonist antiserum to TNFR1 induced Jak kinase and STAT protein phosphorylation. Phosphorylation of Jak proteins was also induced by human TNF, which selectively binds to TNFR1 on murine cells. 35S-labeled Jak kinases were precipitated from a cell-free system and from lysates of 3T3-L1 adipocytes by a glutathione S-transferase fusion protein containing the cytoplasmic domain of TNFR1. These results suggest that the cytoplasmic domain of TNFR1 can directly interact with and form signaling complexes with Jak kinases. Jak2 was precipitated from HeLa cells by antiserum to TNFR1, directly demonstrating their association in vivo. Thus, TNF activates a Jak/STAT signal-transduction cascade by acting through TNFR1.
D Guo; J D Dunbar; C H Yang; L M Pfeffer; D B Donner
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of immunology (Baltimore, Md. : 1950)     Volume:  160     ISSN:  0022-1767     ISO Abbreviation:  J. Immunol.     Publication Date:  1998 Mar 
Date Detail:
Created Date:  1998-03-26     Completed Date:  1998-03-26     Revised Date:  2012-06-05    
Medline Journal Info:
Nlm Unique ID:  2985117R     Medline TA:  J Immunol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2742-50     Citation Subset:  AIM; IM    
Department of Microbiology and Immunology and the Walther Oncology Center, Indiana University School of Medicine, Indianapolis 46202, USA.
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MeSH Terms
3T3 Cells
DNA / metabolism
DNA-Binding Proteins / physiology*
Janus Kinase 1
Janus Kinase 2
Milk Proteins*
Protein-Tyrosine Kinases / physiology*
Proto-Oncogene Proteins*
Receptors, Tumor Necrosis Factor / physiology*
STAT1 Transcription Factor
STAT3 Transcription Factor
STAT5 Transcription Factor
STAT6 Transcription Factor
Signal Transduction
Trans-Activators / physiology*
Tumor Necrosis Factor-alpha / pharmacology
Tyrosine / metabolism
Grant Support
Reg. No./Substance:
0/DNA-Binding Proteins; 0/Jak1 protein, mouse; 0/Milk Proteins; 0/Proto-Oncogene Proteins; 0/Receptors, Tumor Necrosis Factor; 0/STAT1 Transcription Factor; 0/STAT1 protein, human; 0/STAT3 Transcription Factor; 0/STAT3 protein, human; 0/STAT5 Transcription Factor; 0/STAT6 Transcription Factor; 0/STAT6 protein, human; 0/Stat1 protein, mouse; 0/Stat3 protein, mouse; 0/Stat6 protein, mouse; 0/Trans-Activators; 0/Tumor Necrosis Factor-alpha; 55520-40-6/Tyrosine; 9007-49-2/DNA; EC protein, human; EC Kinase 1; EC Kinase 2; EC Kinases; EC protein, human; EC protein, mouse

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