Regulation of the murine Nfatc1 gene by NFATc2.

Zhou B, Cron RQ, Wu B, Genin A, Wang Z, Liu S, Robson P, Baldwin HS
J Biol Chem. 2002 277 (12): 10704-11

PMID: 11786533 · DOI:10.1074/jbc.M107068200

NFAT proteins play a key role in the inducible expression of cytokine genes in T lymphocytes. NFATc1 and NFATc2 are the predominant NFAT family members in the peripheral immune system. NFATc2 is found abundantly in the cytoplasm of resting T cells, whereas Nfatc1 expression is induced during T cell activation. To investigate Nfatc1 regulation, we characterized the structure of the murine Nfatc1 gene and its 5'-flanking region. A 290-bp sequence proximal to the transcription start site is highly conserved between mouse and human and possesses both basal and inducible promoter activities. Multiple binding sites for transcription factors were identified within this region, including a consensus NFAT-binding site. This promoter segment was cyclosporin A-sensitive, and mutation of the NFAT site abrogated inducible promoter activity and inhibited formation of an inducible DNA x protein complex containing NFATc2 in primary T cells. Overexpression of NFATc2 increased inducible Nfatc1 promoter activity, whereas this inducibility was attenuated in NFATc2(-/-) splenocytes. This study suggests that pre-existing NFATc2 contributes to the subsequent induction of Nfatc1 during T cell activation.

MeSH Terms (31)

Animals Base Sequence Binding Sites Blotting, Northern Blotting, Western Cell Nucleus Cells, Cultured Cytoplasm DNA, Complementary DNA-Binding Proteins Gene Expression Regulation Gene Library Genes, Reporter Humans Lymphocyte Activation Mice Mice, Inbred BALB C Models, Genetic Molecular Sequence Data Mutagenesis Mutagenesis, Site-Directed NFATC Transcription Factors Nuclear Proteins Plasmids Polymerase Chain Reaction Promoter Regions, Genetic Protein Binding Protein Structure, Tertiary Time Factors Transcription, Genetic Transcription Factors

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