title: Histone acetyltransferase p300 regulates the expression of human pituitary tumor transforming gene (hPTTG).
abstract: The human pituitary tumor transforming gene (hPTTG) serves as a marker for malignancy grading in several cancers. hPTTG is involved in multiple cellular pathways including cell transformation, apoptosis, DNA repair, genomic instability, mitotic control and angiogenesis induction. However, the molecular mechanisms underlying hPTTG regulation have not been fully explored. In this study, we found that overexpression of histone acetyltransferase (HAT) p300 upregulated hPTTG at the levels of promoter activity, mRNA and protein expression. Moreover, the HAT activity of p300 was critical for its regulatory function. Chromatin immunoprecipitation (ChIP) analysis revealed that overexpression of p300 elevated the level of histone H3 acetylation on the hPTTG promoter. Additionally, the NF-Y sites at the hPTTG promoter exhibited a synergistic effect on upregulation of hPTTG through interacting with p300. We also found that treatment of 293T cells with the histone deacetylase (HDAC) inhibitor Trichostatin A (TSA) increased hPTTG promoter activity. Meanwhile, we provided evidence that HDAC3 decreased hPTTG promoter activity. These data implicate an important role of the histone acetylation modification in the regulation of hPTTG.
authors.affiliation: Key Laboratory of Molecular Epigenetics of Ministry of Education, Institute of Genetics and Cytology, Northeast Normal University, Changchun, China.
authors.forename: Tian
authors.initials: T
authors.lastname: Li
authors.forename: Hui
authors.initials: H
authors.lastname: Huang
authors.forename: Binlu
authors.initials: B
authors.lastname: Huang
authors.forename: Baiqu
authors.initials: B
authors.lastname: Huang
authors.forename: Jun
authors.initials: J
authors.lastname: Lu
mesh_terms: D000107:Acetylation; D002460:Cell Line; D005786:Gene Expression Regulation; D006657:Histones / Q000235:genetics / Q000378:metabolism; D006801:Humans; D009363:Neoplasm Proteins / Q000235:genetics* / Q000378:metabolism; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D064249:Securin; D015854:Up-Regulation; D050880:p300-CBP Transcription Factors / Q000235:genetics / Q000378:metabolism*; D000099224:p300-CBP-Associated Factor
chemical_list: D006657:Histones; D009363:Neoplasm Proteins; D064249:Securin; D050880:p300-CBP Transcription Factors; D000099224:p300-CBP-Associated Factor