title: Methylation-mediated repression of PRDM14 contributes to apoptosis evasion in HPV-positive cancers.
abstract: Promoter methylation of the transcription factor PRDM14 (PRDI-BF1 and RIZ domain containing 14) represents a highly frequent event in human papillomavirus (HPV)-induced cervical cancers and cancer precursor lesions. Here, we aimed to assess the functional consequences of PRDM14 promoter methylation in HPV-induced carcinogenesis. PRDM14 promoter methylation, expression and consequences of ectopic PRDM14 expression were studied in HPV16-positive cervical and oral cancer cell lines (SiHa, CaSki and 93VU147T), human embryonic kidney 293 (HEK293T) cells and primary human foreskin keratinocytes (HFK). PRDM14 mRNA expression was restricted to HEK293T and HFK cells, and could be upregulated in SiHa cells upon DNA methylation inhibition. Ectopic expression of PRDM14 in SiHa, CaSki and 93VU147T cells resulted in significantly more apoptotic cells, as measured by annexin V labelling, compared to HEK293T and HFK cells. MRNA profiling of 41 apoptosis regulators identified NOXA and PUMA as candidate target genes involved in PRDM14-mediated apoptosis induction. Full-length PRDM14 transactivated both NOXA and PUMA promoters. Transactivation was abolished upon deletion of the PRDM14 DNA binding domain. This suggests that NOXA and PUMA expression is directly regulated by PRDM14, which in case of NOXA was linked to a consensus PRDM14 binding motif in the promoter region. Taken together, these results suggest that PRDM14 acts as a regulator of NOXA and PUMA-mediated apoptosis induction, thereby providing evidence for a tumour suppressive role in HPV-induced carcinogenesis. The contribution of methylation-mediated gene silencing of PRDM14 to apoptosis evasion in HPV-positive cancer cells offers novel therapeutic options for HPV-induced cancers.
authors.affiliation: Department of Pathology, Unit of Molecular Pathology, VU University Medical Center, Amsterdam, The Netherlands and.
authors.forename: Suzanne
authors.initials: S
authors.lastname: Snellenberg
authors.affiliation: Department of Pathology, Unit of Molecular Pathology, VU University Medical Center, Amsterdam, The Netherlands and.
authors.forename: Saskia A G M
authors.initials: SA
authors.lastname: Cillessen
authors.affiliation: Department of Pathology, Unit of Molecular Pathology, VU University Medical Center, Amsterdam, The Netherlands and BioBix, Department of Mathematical Modelling, Statistics and Bioinformatics, Ghent University, Ghent, Belgium.
authors.forename: Wim
authors.initials: W
authors.lastname: Van Criekinge
authors.affiliation: Department of Pathology, Unit of Molecular Pathology, VU University Medical Center, Amsterdam, The Netherlands and.
authors.forename: Leontien
authors.initials: L
authors.lastname: Bosch
authors.affiliation: Department of Pathology, Unit of Molecular Pathology, VU University Medical Center, Amsterdam, The Netherlands and.
authors.forename: Chris J L M
authors.initials: CJ
authors.lastname: Meijer
authors.affiliation: Department of Pathology, Unit of Molecular Pathology, VU University Medical Center, Amsterdam, The Netherlands and.
authors.forename: Peter J F
authors.initials: PJ
authors.lastname: Snijders
authors.affiliation: Department of Pathology, Unit of Molecular Pathology, VU University Medical Center, Amsterdam, The Netherlands and r.steenbergen@vumc.nl.
authors.forename: Renske D M
authors.initials: RD
authors.lastname: Steenbergen
mesh_terms: D017209:Apoptosis / Q000235:genetics; D019175:DNA Methylation / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000096:biosynthesis / Q000235:genetics; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D057809:HEK293 Cells; D052162:Human papillomavirus 16 / Q000472:pathogenicity; D006801:Humans; D015603:Keratinocytes / Q000821:virology; D009062:Mouth Neoplasms / Q000235:genetics* / Q000473:pathology / Q000821:virology; D011401:Promoter Regions, Genetic; D016601:RNA-Binding Proteins; D012097:Repressor Proteins / Q000096:biosynthesis / Q000235:genetics*; D014157:Transcription Factors; D002583:Uterine Cervical Neoplasms / Q000235:genetics* / Q000473:pathology / Q000821:virology
chemical_list: D004268:DNA-Binding Proteins; C524724:PRDM14 protein, human; D016601:RNA-Binding Proteins; D012097:Repressor Proteins; D014157:Transcription Factors