Howard Hughes Medical Institute and Program in Molecular Medicine
Animals; COS Cells; Cell Line; Cricetinae; DNA-Binding Proteins; *Gene Expression Regulation; Humans; Interleukin-2; Jurkat Cells; Mice; Mice, Transgenic; NFATC Transcription Factors; *Nuclear Proteins; Transcription Factors; Transcription, Genetic
Life Sciences | Medicine and Health Sciences
The nuclear factor of activated T cells (NFAT) transcription factor is implicated in expression of the cytokine interleukin-2 (IL-2). Binding sites for NFAT are located in the IL-2 promoter. Furthermore, pharmacological studies demonstrate that the drug cyclosporin A inhibits both NFAT activation and IL-2 expression. However, targeted disruption of the NFAT1 and NFAT2 genes in mice does not cause decreased IL-2 secretion. The role of NFAT in IL-2 gene expression is therefore unclear. Here we report the construction of a dominant-negative NFAT mutant (dnNFAT) that selectively inhibits NFAT-mediated gene expression. The inhibitory effect of dnNFAT is mediated by suppression of activation-induced nuclear translocation of NFAT. Expression of dnNFAT in cultured T cells caused inhibition of IL-2 promoter activity and decreased expression of IL-2 protein. Similarly, expression of dnNFAT in transgenic mice also caused decreased IL-2 gene expression. These data demonstrate that NFAT is a critical component of the signaling pathway that regulates IL-2 expression.
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Citation: Mol Cell Biol. 1999 Mar;19(3):2300-7.
Molecular and cellular biology
Chow, Chi-Wing; Rincon, Mercedes; and Davis, Roger J., "Requirement for transcription factor NFAT in interleukin-2 expression" (1999). Open Access Articles. 1444.