NFAT-3 is a transcriptional repressor of the growth-associated protein 43 during neuronal maturation

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Abstract

Transcription is essential for neurite and axon outgrowth during development. Recent work points to the involvement of nuclear factor of activated T cells (NFAT) in the regulation of genes important for axon growth and guidance. However, NFAT has not been reported to directly control the transcription of axon outgrowth-related genes. To identify transcriptional targets, we performed an in silico promoter analysis and found a putative NFAT site within the GAP-43 promoter. Using in vitro and in vivo experiments, we demonstrated that NFAT-3 regulates GAP-43, but unexpectedly, does not promote but represses the expression of GAP-43 in neurons and in the developing brain. Specifically, in neuron-like PC-12 cells and in cultured cortical neurons, the overexpression of NFAT-3 represses GAP-43 activation mediated by neurotrophin signaling. Using chromatin immunoprecipitation assays, we also show that prior to neurotrophin activation, endogenous NFAT-3 occupies the GAP-43 promoter in PC-12 cells, in cultured neurons, and in the mouse brain. Finally, we observe that NFAT-3 is required to repress the physiological expression of GAP-43 and other proaxon outgrowth genes in specific developmental windows in the mouse brain. Taken together, our data reveal an unexpected role for NFAT-3 as a direct transcriptional repressor of GAP-43 expression and suggest a more general role for NFAT-3 in the control of the neuronal outgrowth program. © 2009 by The American Society for Biochemistry and Molecular Biology, Inc.

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Nguyen, T., Lindner, R., Tedeschi, A., Forsberg, K., Green, A., Wuttke, A., … Di Giovanni, S. (2009). NFAT-3 is a transcriptional repressor of the growth-associated protein 43 during neuronal maturation. Journal of Biological Chemistry, 284(28), 18816–18823. https://doi.org/10.1074/jbc.M109.015719

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