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01.12.2016 | Research article | Ausgabe 1/2016 Open Access

BMC Cancer 1/2016

Epigenetic silencing of miR-181c by DNA methylation in glioblastoma cell lines

Zeitschrift:
BMC Cancer > Ausgabe 1/2016
Autoren:
Erandi Ayala-Ortega, Rodrigo Arzate-Mejía, Rosario Pérez-Molina, Edgar González-Buendía, Karin Meier, Georgina Guerrero, Félix Recillas-Targa
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​s12885-016-2273-6) contains supplementary material, which is available to authorized users.

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

EA-O and FR-T designed the study and wrote the manuscript. EA-O, RA-M, RP-M, EG-B, GG and KM performed the experiments. FR-T, RA-M and EA-O performed the bioinformatic analysis of the corresponding genomic region. All authors read and approved the final version of the manuscript.

Abstract

Background

Post-transcriptional regulation by microRNAs is recognized as one of the major pathways for the control of cellular homeostasis. Less well understood is the transcriptional and epigenetic regulation of genes encoding microRNAs. In the present study we addressed the epigenetic regulation of the miR-181c in normal and malignant brain cells.

Methods

To explore the epigenetic regulation of the miR-181c we evaluated its expression using RT-qPCR and the in vivo binding of the CCCTC-binding factor (CTCF) to its regulatory region in different glioblastoma cell lines. DNA methylation survey, chromatin immunoprecipitation and RNA interference assays were used to assess the role of CTCF in the miR-181c epigenetic silencing.

Results

We found that miR-181c is downregulated in glioblastoma cell lines, as compared to normal brain tissues. Loss of expression correlated with a notorious gain of DNA methylation at the miR-181c promoter region and the dissociation of the multifunctional nuclear factor CTCF. Taking advantage of the genomic distribution of CTCF in different cell types we propose that CTCF has a local and cell type specific regulatory role over the miR-181c and not an architectural one through chromatin loop formation. This is supported by the depletion of CTCF in glioblastoma cells affecting the expression levels of NOTCH2 as a target of miR-181c.

Conclusion

Together, our results point to the epigenetic role of CTCF in the regulation of microRNAs implicated in tumorigenesis.
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