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Regulation of non-AU-rich element containing c-fms proto-oncogene expression by HuR in breast cancer

Abstract

The role of RNA-binding proteins in cancer biology is recognized increasingly. The nucleocytoplasmic shuttling and AU-rich RNA-binding protein HuR stabilizes several cancer-related target mRNAs. The proto-oncogene c-fms, whose 3′untranslated region (3′UTR) is not AU-rich, is associated with poor prognosis in breast cancer. Using a large breast-cancer tissue array (N=670), we found nuclear HuR expression to be associated with nodal metastasis and independently with poor survival (P=0.03, RR 1.45), as well as to be co-expressed with c-fms in the breast tumors (P=0.0007). We described c-fms mRNA as a direct target of HuR in vivo, and that HuR bound specifically to a 69-nt region containing ‘CUU’ motifs in 3′UTR c-fms RNA. Overexpressing or silencing HuR significantly up- or down-regulated c-fms RNA expression, respectively. We also found that known glucocorticoid stimulation of c-fms RNA and protein is largely dependent on the presence of HuR. HuR, by binding to the 69-nt wild type, but not mutant, c-fms sequence can regulate reporter gene expression post-transcriptionally. We are the first to describe that HuR can regulate gene expression by binding non-AU-rich sequences in 3′UTR c-fms RNA. Collectively, our findings suggest that HuR plays a supportive role for c-fms in breast cancer progression by binding a 69-nt element in its 3′UTR, thus regulating its expression.

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Abbreviations

ARE:

AU-rich elements

3′UTR:

3′untranslated region; dex, dexamethasone

IP:

immunoprecipitation

qRT–PCR:

reverse transcription and quantitative real-time polymerase chain reaction (real-time PCR)

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Acknowledgements

This work was supported by Department of Defense Grant DAMD 17-02-1-0633 (to SKC), and in part by the Susan G Komen Breast Cancer Foundation and by the Breast Cancer Alliance (to HMK). We thank Joan A Steitz for providing the GST plasmids, and Ite A Laird-Offringa for providing purified HuR protein.

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Correspondence to S K Chambers.

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Supplementary Information accompanies the paper on the Oncogene website (http://www.nature.com/onc)

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Woo, HH., Zhou, Y., Yi, X. et al. Regulation of non-AU-rich element containing c-fms proto-oncogene expression by HuR in breast cancer. Oncogene 28, 1176–1186 (2009). https://doi.org/10.1038/onc.2008.469

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