Interleukin-2-induced tyrosine phosphorylation of p52shc in T lymphocytes.
Stimulation of activated T cells with interleukin-2 (IL-2) results in the tyrosine phosphorylation of several intracellular proteins. The present studies demonstrate that IL-2 stimulation induces phosphorylation of the src homology 2 domain-containing protein, p52shc, on both tyrosine and serine residues. The level of p52shc phosphorylation was maximal within 5 min after growth factor addition and declined gradually thereafter. In addition, anti-Shc immunoprecipitates from IL-2-stimulated T cells contained a co-precipitating protein tyrosine kinase (PTK) activity that phosphorylated p52shc on tyrosine residues in immune complex kinase assays. These results demonstrate that p52shc is an early substrate for IL-2 receptor-coupled PTK activity(s) and suggest that this protein may be involved in the transduction of PTK-dependent regulatory signals in IL-2-stimulated T cells.
Burns
L A
LA
Department of Immunology, Mayo Clinic and Foundation, Rochester, Minnesota 55905.
Karnitz
L M
LM
Sutor
S L
SL
Abraham
R T
RT
D048868:Adaptor Proteins, Signal Transducing; D033942:Adaptor Proteins, Vesicular Transport; D000818:Animals; D002460:Cell Line; D006801:Humans; D007376:Interleukin-2 / Q000494:pharmacology*; D051379:Mice; D010766:Phosphorylation; D019000:Phosphotyrosine; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D011506:Proteins / Q000302:isolation & purification / Q000378:metabolism*; D015375:Receptors, Interleukin-2 / Q000378:metabolism; D011994:Recombinant Proteins / Q000494:pharmacology; D055765:Shc Signaling Adaptor Proteins; D015398:Signal Transduction; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D013602:T-Lymphocytes, Cytotoxic / Q000187:drug effects / Q000378:metabolism*; D014443:Tyrosine / Q000031:analogs & derivatives / Q000032:analysis / Q000378:metabolism*
D048868:Adaptor Proteins, Signal Transducing; D033942:Adaptor Proteins, Vesicular Transport; D007376:Interleukin-2; D011506:Proteins; D015375:Receptors, Interleukin-2; D011994:Recombinant Proteins; C528024:SHC1 protein, human; D055765:Shc Signaling Adaptor Proteins; C528034:Shc1 protein, mouse; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D019000:Phosphotyrosine; D014443:Tyrosine; D011505:Protein-Tyrosine Kinases