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Article

Dysregulation of microRNA expression drives aberrant DNA hypermethylation in basal-like breast cancer

  • Authors:
    • Rupninder Sandhu
    • Ashley G. Rivenbark
    • Randi M. Mackler
    • Chad A. Livasy
    • William B. Coleman
  • View Affiliations / Copyright

    Affiliations: Department of Pathology and Laboratory Medicine, University of North Carolina School of Medicine, Chapel Hill, NC 27599, USA
  • Pages: 563-572
    |
    Published online on: November 29, 2013
       https://doi.org/10.3892/ijo.2013.2197
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Abstract

Basal-like breast cancers frequently express aberrant DNA hypermethylation associated with concurrent silencing of specific genes secondary to DNMT3b overexpression and DNMT hyperactivity. DNMT3b is known to be post-transcriptionally regulated by microRNAs. The objective of the current study was to determine the role of microRNA dysregulation in the molecular mechanism governing DNMT3b overexpression in primary breast cancers that express aberrant DNA hypermethylation. The expression of microRNAs (miRs) that regulate (miR-29a, miR-29b, miR-29c, miR-148a and miR-148b) or are predicted to regulate DNMT3b (miR‑26a, miR-26b, miR-203 and miR-222) were evaluated among 70 primary breast cancers (36 luminal A-like, 13 luminal B-like, 5 HER2‑enriched, 16 basal-like) and 18 normal mammoplasty tissues. Significantly reduced expression of miR-29c distinguished basal-like breast cancers from other breast cancer molecular subtypes. The expression of aberrant DNA hypermethylation was determined in a subset of 33 breast cancers (6 luminal A-like, 6 luminal B-like, 5 HER2-enriched and 16 basal-like) through examination of methylation‑sensitive biomarker gene expression (CEACAM6, CDH1, CST6, ESR1, GNA11, MUC1, MYB, TFF3 and SCNN1A), 11/33 (33%) cancers exhibited aberrant DNA hypermethylation including 9/16 (56%) basal-like cancers, but only 2/17 (12%) non-basal-like cancers (luminal A-like, n=1; HER2-enriched, n=1). Breast cancers with aberrant DNA hypermethylation express diminished levels of miR-29a, miR-29b, miR-26a, miR-26b, miR-148a and miR-148b compared to cancers lacking aberrant DNA hypermethylation. A total of 7/9 (78%) basal-like breast cancers with aberrant DNA hypermethylation exhibit diminished levels of ≥6 regulatory miRs. The results show that i) reduced expression of miR-29c is characteristic of basal-like breast cancers, ii) miR and methylation-sensitive gene expression patterns identify two subsets of basal-like breast cancers, and iii) the subset of basal-like breast cancers with reduced expression of multiple regulatory miRs express aberrant DNA hypermethylation. Together, these findings strongly suggest that the molecular mechanism governing the DNMT3b-mediated aberrant DNA hypermethylation in primary breast cancer involves the loss of post-transcriptional regulation of DNMT3b by regulatory miRs.
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Spandidos Publications style
Sandhu R, Rivenbark AG, Mackler RM, Livasy CA and Coleman WB: Dysregulation of microRNA expression drives aberrant DNA hypermethylation in basal-like breast cancer. Int J Oncol 44: 563-572, 2014.
APA
Sandhu, R., Rivenbark, A.G., Mackler, R.M., Livasy, C.A., & Coleman, W.B. (2014). Dysregulation of microRNA expression drives aberrant DNA hypermethylation in basal-like breast cancer. International Journal of Oncology, 44, 563-572. https://doi.org/10.3892/ijo.2013.2197
MLA
Sandhu, R., Rivenbark, A. G., Mackler, R. M., Livasy, C. A., Coleman, W. B."Dysregulation of microRNA expression drives aberrant DNA hypermethylation in basal-like breast cancer". International Journal of Oncology 44.2 (2014): 563-572.
Chicago
Sandhu, R., Rivenbark, A. G., Mackler, R. M., Livasy, C. A., Coleman, W. B."Dysregulation of microRNA expression drives aberrant DNA hypermethylation in basal-like breast cancer". International Journal of Oncology 44, no. 2 (2014): 563-572. https://doi.org/10.3892/ijo.2013.2197
Copy and paste a formatted citation
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Spandidos Publications style
Sandhu R, Rivenbark AG, Mackler RM, Livasy CA and Coleman WB: Dysregulation of microRNA expression drives aberrant DNA hypermethylation in basal-like breast cancer. Int J Oncol 44: 563-572, 2014.
APA
Sandhu, R., Rivenbark, A.G., Mackler, R.M., Livasy, C.A., & Coleman, W.B. (2014). Dysregulation of microRNA expression drives aberrant DNA hypermethylation in basal-like breast cancer. International Journal of Oncology, 44, 563-572. https://doi.org/10.3892/ijo.2013.2197
MLA
Sandhu, R., Rivenbark, A. G., Mackler, R. M., Livasy, C. A., Coleman, W. B."Dysregulation of microRNA expression drives aberrant DNA hypermethylation in basal-like breast cancer". International Journal of Oncology 44.2 (2014): 563-572.
Chicago
Sandhu, R., Rivenbark, A. G., Mackler, R. M., Livasy, C. A., Coleman, W. B."Dysregulation of microRNA expression drives aberrant DNA hypermethylation in basal-like breast cancer". International Journal of Oncology 44, no. 2 (2014): 563-572. https://doi.org/10.3892/ijo.2013.2197
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