The ability of the T lymphocyte growth factor interleukin 2 (IL-2) to activate a tyrosine protein kinase in vivo was assessed by using antibodies to phosphotyrosine in conjunction with immunoblots. Treatment of the murine IL-2-dependent cytotoxic T cell line CTLL-2 with IL-2 resulted in an increase in tyrosine phosphorylation of several proteins of molecular weights ranging from 38,000 to 120,000. The tyrosine phosphorylation in the various proteins increased in a concomitant fashion and reached a maximum level within 15 min. The concentration of IL-2 required for inducing this phosphorylation was similar to that required for stimulating [3H]thymidine uptake, indicating that the increase in tyrosine phosphorylation correlated with the ability of IL-2 to stimulate the proliferation of the CTLL-2 cells. IL-2 was also found to induce the phosphorylation of proteins on tyrosine residues in short term cultures of human T lymphocytes. These results suggest that IL-2, like other polypeptide growth factors, acts by stimulating the activity of a tyrosine protein kinase.
Activation of a tyrosine protein kinase is an early event in the stimulation of T lymphocytes by interleukin-2.
E. Saltzman,R R Thom,J. Casnellie
Published 1988 in Journal of Biological Chemistry
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PUBLICATION RECORD
- Publication year
1988
- Venue
Journal of Biological Chemistry
- Publication date
1988-05-25
- Fields of study
Biology, Medicine
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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