Abstract
Promyelocytic leukemia (PML) protein is a tumor suppressor with complicated action mechanisms not yet fully understood. In this study, we found that the nuclear factor of activated T cell (NFAT) is an unexpected partner of PML: PML specifically enhanced the transcription activation of NFAT. In PML-null mouse embryonic fibroblasts, no transcription activity of NFAT could be detected. There was a selective requirement of PML isoform in NFAT activation: PML-I and PML-VI, but not PML-IV, increased NFAT transactivation. PML specifically promoted the expression of many, but not all, NFAT-targeted genes. We found a specific binding of PML to NFATc. The interaction of PML with NFATc in vivo was further confirmed by chromatin immunoprecipitation and DNA affinity precipitation assay analysis. The unexpected coupling of PML with NFAT reveals a novel mechanism underlying the diverse physiological functions of PML.
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Acknowledgements
This work was supported by Grants NSC93-2320-B001-029 and NSC 94-2320-B001-012 from the National Science Council, and Grant AS-95-TP-B02-2 from Academia Sinica, Taiwan, R.O.C. We thank Dr Gerd G. Maul for PML-null MEFs, Drs Gerald Crabtree, Ron Evans, Laurie H Glimcher, Hsiou-Chi Liou and Anjana Rao for plasmids, and Dr Harry Wilson for editing the manuscript.
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Lo, YH., Wu, CC., Shih, HM. et al. Selective activation of NFAT by promyelocytic leukemia protein. Oncogene 27, 3821–3830 (2008). https://doi.org/10.1038/onc.2008.2
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DOI: https://doi.org/10.1038/onc.2008.2