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J. Biol. Chem., Vol. 268, Issue 18, 13097-13102, Jun, 1993
K Izuhara and N Harada
To study the signal transduction mechanism of interleukin-4 (IL-4), we have
examined the effects of IL-4 on protein tyrosine phosphorylation in a mouse
IL-2-dependent T cell line, HT2. Mouse IL-4 induces HT2 proliferation in a
dose-dependent manner. Western blotting analyses using anti-phosphotyrosine
antibody showed that IL-4 induces tyrosine phosphorylation of four proteins
(140, 110, 100, and 92 kDa) in a dose- dependent manner. Protein tyrosine
phosphorylation was detected within 1 min and reached a plateau
approximately at 10 min after IL-4 stimulation. Immunoprecipitation using
anti-IL-4 receptor antibody revealed that the 140-kDa
tyrosine-phosphorylated protein is the IL-4 receptor (IL-4R) itself.
Furthermore, we demonstrate that phosphatidylinositol 3-kinase (PI
3-kinase) activity in immunoprecipitates with anti-IL-4R antibody increases
after IL-4 stimulation. These data indicate that IL-4 induces activation of
tyrosine kinase and also induces association between IL-4R and PI 3-
kinase.
Interleukin-4 (IL-4) induces protein tyrosine phosphorylation of the IL- 4 receptor and association of phosphatidylinositol 3-kinase to the IL-4 receptor in a mouse T cell line, HT2
Department of Immunology, DNAX Research Institute of Molecular and Cellular Biology, Inc., Palo Alto, California 94304-1104.
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