home *** CD-ROM | disk | FTP | other *** search
- Document 0035
- DOCN M9620035
- TI Costimulation requirement for AP-1 and NF-kappa B transcription factor
- activation in T cells.
- DT 9602
- AU Jung S; Yaron A; Alkalay I; Hatzubai A; Avraham A; Ben-Neriah Y;
- Lautenberg Center for General and Tumor Immunology, Hebrew; University,
- Hadassah Medical School, Jerusalem, Israel.
- SO Ann N Y Acad Sci. 1995 Sep 7;766:245-52. Unique Identifier : AIDSLINE
- MED/96049646
- AB The transcriptional activity of the IL-2 promoter requires T-cell
- costimulation delivered by the TCR and the auxiliary receptor CD28.
- Several transcription factors participate in IL-2 promoter activation,
- among which are AP-1-like factors and NF-kappa B. Protein
- phosphorylation has an important role in the regulation of these two
- factors: (1) it induces the transactivating capacity of the AP-1 protein
- c-Jun; and (2) it is involved in the release of the cytoplasmic
- inhibitor, I kappa B, from NF-kappa B, allowing translocation of the
- latter into the nucleus. We have recently shown that both
- phosphorylation processes require T-cell costimulation. Furthermore, in
- activated T cells, the kinetics of the two phosphorylation events are
- essentially similar. According to our results, however, the kinases
- responsible for the two processes are distinct entities. Whereas TPCK
- inhibits phosphorylation of I kappa B and, consequently, activation of
- NF-kappa B, it markedly enhances the activity of JNK, the MAP
- kinase-related kinase that phosphorylates the transactivation domain of
- c-Jun. We, therefore, propose the activation scheme presented in FIGURE
- 3 for T-cell costimulation. Costimulation results in the activation of a
- signaling pathway that leads to the simultaneous induction of the two
- transcription factors, AP-1 and NF-kappa B. Integration of the signals
- generated by TCR and CD28 engagement occurs along this pathway, which
- then bifurcates to induce I kappa B phosphorylation and NF-kappa B
- activation on the one hand, and JNK activation and c-Jun phosphorylation
- on the other. We are currently engaged in defining where the two signals
- integrate along the AP-1/NF-kappa B pathway.
- DE Antibodies/PHARMACOLOGY Antigens, CD28/IMMUNOLOGY Calmodulin-Dependent
- Protein Kinases/METABOLISM Cell Line Enzyme Activation Human *HIV
- Long Terminal Repeat Interleukin-2/*BIOSYNTHESIS/GENETICS
- Luciferase/BIOSYNTHESIS *Lymphocyte Transformation Models, Biological
- Muromonab-CD3/PHARMACOLOGY NF-kappa B/*METABOLISM Phosphorylation
- Promoter Regions (Genetics) Proto-Oncogene Proteins c-jun/METABOLISM
- Recombinant Proteins/BIOSYNTHESIS T-Lymphocytes/*IMMUNOLOGY/*METABOLISM
- Tetradecanoylphorbol Acetate/PHARMACOLOGY Transcription Factor
- AP-1/*METABOLISM Transfection Tumor Cells, Cultured JOURNAL ARTICLE
-
- SOURCE: National Library of Medicine. NOTICE: This material may be
- protected by Copyright Law (Title 17, U.S.Code).
-
-