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The Fc receptor (FcR) gamma-chain has been shown to be up-regulated in T cells when the TCR zeta-chain is decreased. We demonstrate that Elf-1, but not other Ets family transcription factors, bind to a cluster of GGAA sites located within the 200 bp upstream from the transcription initiation site of the FcRgamma promoter. Forced expression of Elf-1 results in the suppression of FcRgamma expression, whereas silencing its expression with small interfering RNA Elf-1 results in increased FcRgamma expression. Elf-1 represents the first transcription factor identified to be involved in the transcriptional regulation of FcRgamma, and cells that fail to express Elf-1, as is the case with human systemic lupus erythematosus T cells, will express FcRgamma-chain.

Elf-1 Binds to GGAA Elements on the FcRγ Promoter and Represses Its Expression