Cutting edge: TCR stimulation by antibody and bacterial superantigen induces Stat3 activation in human T cells
Research output: Contribution to journal › Journal article › Research › peer-review
Recent data show that TCR/CD3 stimulation induces activation of Stat5 in murine T cells. Here, we show that CD3 ligation by mAb and Staphylococcal enterotoxin (SE) induce a rapid, gradually accumulating, long-lasting tyrosine, and serine phosphorylation of Stat3 (but not Stat5) in allogen-specific human CD4+ T cell lines. In contrast, IL-2 induces a rapid and transient tyrosine and serine phosphorylation of Stat3. Compared with IL-2, CD3 ligation induces a delayed Stat3 binding to oligonucleotide probes from the ICAM-1 and IL-2R alpha promoter. CD3-mediated activation of Stat3 is almost completely inhibited by a Src kinase inhibitor (PP1), whereas IL-2-induced Stat3 activation is unaffected. In conclusion, we show that CD3 ligation by mAb and SE triggers a rapid, PP1-sensitive tyrosine and serine phosphorylation of Stat3 in human CD4+ T cells. Moreover, we provide evidence that TCR/CD3 and IL-2 induce Stat3 activation via distinct signaling pathways.
Original language | English |
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Journal | Journal of Immunology |
Volume | 163 |
Issue number | 4 |
Pages (from-to) | 1742-5 |
Number of pages | 3 |
ISSN | 0022-1767 |
Publication status | Published - 1999 |
Bibliographical note
Keywords: Antibodies, Monoclonal; Antigens, CD3; Binding Sites; CD4-Positive T-Lymphocytes; Cell Line; DNA; DNA-Binding Proteins; Enterotoxins; Epitopes, T-Lymphocyte; Humans; Interleukin-2; Oligonucleotides; Phosphorylation; Promoter Regions (Genetics); Receptors, Antigen, T-Cell; STAT3 Transcription Factor; Signal Transduction; Staphylococcus aureus; Superantigens; Trans-Activators; Tyrosine
ID: 8545155