Protein arginine methyltransferase 5 (PRMT5) activates WNT/β‐catenin signalling in breast cancer cells via epigenetic silencing of DKK1 and DKK3
<p></p><div> <p>Protein arginine methyltransferase 5 (PRMT5) activity is dysregulated in many aggressive cancers and its enhanced levels are associated with increased tumour growth and survival. However, the role of PRMT5 in breast cancer remains underexplored. In this study,...
محفوظ في:
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| مؤلفون آخرون: | , |
| منشور في: |
2023
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| الملخص: | <p></p><div> <p>Protein arginine methyltransferase 5 (PRMT5) activity is dysregulated in many aggressive cancers and its enhanced levels are associated with increased tumour growth and survival. However, the role of PRMT5 in breast cancer remains underexplored. In this study, we show that PRMT5 is overexpressed in breast cancer cell lines, and that it promotes WNT/β-CATENIN proliferative signalling through epigenetic silencing of pathway antagonists, <i>DKK1</i> and <i>DKK3</i>, leading to enhanced expression of <i>c-MYC</i>, <i>CYCLIN D1</i> and <i>SURVIVIN</i>. Through chromatin immunoprecipitation (ChIP) studies, we found that PRMT5 binds to the promoter region of WNT antagonists, <i>DKK1</i> and <i>DKK3</i>, and induces symmetric methylation of H3R8 and H4R3 histones. Our findings also show that PRMT5 inhibition using a specific small molecule inhibitor, compound 5 (CMP5), reduces PRMT5 recruitment as well as methylation of H3R8 and H4R3 histones in the promoter regions of <i>DKK1</i> and <i>DKK3</i>, which consequently results in reduced expression <i>CYCLIN D1</i> and <i>SURVIVIN</i>. Furthermore, CMP5 treatment either alone or in combination with 5-Azacytidine and Trichostatin A restored expression of <i>DKK1</i> and <i>DKK3</i> in TNBCs. PRMT5 inhibition also altered the growth characteristics of breast cancer cells and induced their death. Collectively, these results show that PRMT5 controls breast cancer cell growth through epigenetic silencing of WNT/β-CATENIN pathway antagonists, DKK1 and DKK3, resulting in up-regulation of WNT/β-CATENIN proliferative signalling.</p> </div><p></p><h2>Other Information</h2> <p> Published in: Journal of Cellular and Molecular Medicine<br> License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="http://dx.doi.org/10.1111/jcmm.16260" target="_blank">http://dx.doi.org/10.1111/jcmm.16260</a></p> |
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