title: HDAC1/DNMT3A-containing complex is associated with suppression of Oct4 in cervical cancer cells.
abstract: Octamer-binding transcription factor 4 (Oct4), an important embryonic transcriptional factor, is highly expressed in several tumors and is considered as a hallmark of cancer stem cells. Knowledge about the expression and regulatory mechanisms of Oct4 can contribute to the treatment of cancers. As for cervical cancer, however, details remain obscure about Oct4 expression and its regulatory mechanism. In this study, we found that the level of Oct4 in human papillomavirus 16 (HPV16)- positive cervical cancer cells (CaSki cells) was higher than that in HPV-negative cervical cancer cells (C-33A cells), whereas both the level of histone deacetylase 1 (HDAC1) and DNA methyltransferase 3A (DNMT3A) were lower in CaSki cells than those in C-33A cells. Treatment with valproic acid, an HDAC inhibitor, could significantly increase the expression of Oct4 in C-33A cells, but only slightly increased Oct4 in CaSki cells. Co-immunoprecipitation assays showed that HDAC1 and DNMT3A existed in a common complex. The co-immunoprecipitated DNMT3A or HDAC1 was dose-dependently decreased with valproic acid treatment. These results indicated that HDAC1/DNMT3A-containing complex is associated with the suppression of Oct4 in cervical cancer cells, and the activity of HDAC1 is required in the repression of Oct4.
authors.affiliation: Department of Biochemistry and Molecular Biology, Third Military Medical University, 400038 Chongqing, China. liu.db1980@yahoo.com.cn
authors.forename: Dongbo
authors.initials: D
authors.lastname: Liu
authors.forename: Peng
authors.initials: P
authors.lastname: Zhou
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Gong
authors.forename: Gang
authors.initials: G
authors.lastname: Huang
authors.forename: Yingru
authors.initials: Y
authors.lastname: Zheng
authors.forename: Fengtian
authors.initials: F
authors.lastname: He
mesh_terms: D004248:DNA (Cytosine-5-)-Methyltransferases / Q000378:metabolism*; D000090205:DNA Methyltransferase 3A; D005260:Female; D056284:Histone Deacetylase 1 / Q000037:antagonists & inhibitors / Q000378:metabolism*; D006801:Humans; D050814:Octamer Transcription Factor-3 / Q000037:antagonists & inhibitors* / Q000096:biosynthesis / Q000378:metabolism; D013329:Structure-Activity Relationship; D014407:Tumor Cells, Cultured; D002583:Uterine Cervical Neoplasms / Q000378:metabolism* / Q000473:pathology; D014635:Valproic Acid / Q000494:pharmacology
chemical_list: C000717967:DNMT3A protein, human; D050814:Octamer Transcription Factor-3; C494173:POU5F1 protein, human; D014635:Valproic Acid; D004248:DNA (Cytosine-5-)-Methyltransferases; D000090205:DNA Methyltransferase 3A; C110550:HDAC1 protein, human; D056284:Histone Deacetylase 1