Abstract
The small GTPase H-Ras is a proto-oncogene that activates a variety of different pathways including the extracellular-signal-regulated kinase (ERK)/mitogen-activated protein kinase pathway. H-Ras is mutated in many human malignancies, and these mutations cause the protein to be constitutively active. Phosphoprotein enriched in astrocytes, 15 kDa (PEA-15) blocks ERK-dependent gene transcription and inhibits proliferation by sequestering ERK in the cytoplasm. We therefore investigated whether PEA-15 influences H-Ras-mediated transformation. We found that PEA-15 does not block H-Ras-activated proliferation when H-Ras is constitutively active. We show instead that in H-Ras-transformed mouse kidney epithelial cells, co-expression of PEA-15 resulted in enhanced soft agar colony growth and increased tumor growth in vivo. Overexpression of both H-Ras and PEA-15 resulted in accelerated G1/S cell cycle transition and increased activation of the ERK signaling pathway. PEA-15 mediated these effects through activation of its binding partner phospholipase D1 (PLD1). Inhibition of PLD1 or interference with PEA-15/PLD1 binding blocked PEA-15's ability to increase ERK activation. Our findings reveal a novel mechanism by which PEA-15 positively regulates Ras/ERK signaling and increases the proliferation of H-Ras-transformed epithelial cells through enhanced PLD1 expression and activation. Thus, our work provides a surprising mechanism by which PEA-15 augments H-Ras-driven transformation. These data reveal that PEA-15 not only suppresses ERK signaling and tumorigenesis but also alternatively enhances tumorigenesis in the context of active Ras.
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Acknowledgements
We thank Dr Maarit Tiirikainen and the University of Hawaii Cancer Center Genomics Shared Resource laboratory for their assistance with the mRNA expression analysis. We also thank Anna Knapinska, Shirley Young-Robbins and Marci Takemoto for their excellent technical assistance. This work was supported by the National Institutes of Health National Cancer Institute (R01CA93849 to JWR) and National Institute of General Medicine (R01GM088266 to JWR) and the Victoria S and Bradley Geist Foundation (to JWR). MLM was supported by NIH National Center for Reasearch Resources Grant RR016453. DAN and EPW were supported by a grant from the National Institutes of Health (R37CA53370 to EPW).
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Sulzmaier, F., Valmiki, M., Nelson, D. et al. PEA-15 potentiates H-Ras-mediated epithelial cell transformation through phospholipase D. Oncogene 31, 3547–3560 (2012). https://doi.org/10.1038/onc.2011.514
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DOI: https://doi.org/10.1038/onc.2011.514
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