home *** CD-ROM | disk | FTP | other *** search
- Document 0535
- DOCN M9620535
- TI Early activation signal transduction pathways of Th1 and Th2 cell clones
- stimulated with anti-CD3. Roles of protein tyrosine kinases in the
- signal for IL-2 and IL-4 production.
- DT 9602
- AU Tamura T; Nakano H; Nagase H; Morokata T; Igarashi O; Oshimi Y; Miyazaki
- S; Nariuchi H; Department of Allergology, University of Tokyo, Japan.
- SO J Immunol. 1995 Nov 15;155(10):4692-701. Unique Identifier : AIDSLINE
- MED/96062285
- AB In the present experiments, TCR-CD3-associated early activation signal
- transduction pathways were examined in Th1 and Th2 clones by the
- stimulation with soluble monovalent anti-CD3 which resulted in efficient
- production of IL-2 and IL-4 in Th1 and Th2 cells, respectively. Although
- protein tyrosine kinases such as Fyn and ZAP-70 were activated in Th1
- clones shortly after stimulation, these kinases in Th2 clones were not
- activated; but, their activity in resting conditions was shown to be
- decreased by the stimulation. In accordance with these findings, neither
- phospholipase C-gamma 1 activation nor phosphatidyl
- inositol-4,5-bisphosphate breakdown was induced in Th2 clones, in
- contrast to positive responses in Th1 clones. The oscillation of
- intracellular free Ca2+ concentration ([Ca2+]i) was a common signal for
- the activation of both Th1 and Th2 clones; however, the [Ca2+]i
- elevation in Th1 clones was herbimycin A sensitive, whereas that in Th2
- was clone resistant, suggesting that the mechanism of the [Ca2+]i
- elevation in Th2 cells is different from that in Th1 cells in terms of
- the participation of protein tyrosine kinases. The anti-CD3 stimulation
- did not cause Lck activation in either the Th1 or Th2 clone, although
- remarkable activation was induced in both clones following anti-CD4
- stimulation, indicating that Lck activation was not required for either
- IL-2 or IL-4 production of Th cells. Taken together, these results
- indicate that Th1 and Th2 cells are different from each other in early
- activation signal transduction pathways, especially in the role of
- protein tyrosine kinases.
- DE Animal Antigens, CD3/*METABOLISM Clone Cells Enzyme Activation
- Interleukin-2/*BIOSYNTHESIS Interleukin-4/*BIOSYNTHESIS Mice Mice,
- Inbred C3H Mice, Inbred C57BL Protein-Tyrosine Kinase/*METABOLISM
- Proto-Oncogene Proteins/*METABOLISM *Signal Transduction Support,
- Non-U.S. Gov't Th1 Cells/*METABOLISM Th2 Cells/*METABOLISM JOURNAL
- ARTICLE
-
- SOURCE: National Library of Medicine. NOTICE: This material may be
- protected by Copyright Law (Title 17, U.S.Code).
-
-