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1996-02-26
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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).