title: Host Cell Reactivation and Transcriptional Activation of Carboplatin-Modified BRCA1.
abstract: The breast cancer susceptibility gene 1 (BRCA1) has been shown to maintain genomic stability through multiple functions in the regulation of DNA damage repair and transcription. Its translated BRCT (BRCA1 C-terminal domain) acts as a strong transcriptional activator. BRCA1 damaged by carboplatin treatment may lead to a loss of such functions. To address the possibility of the BRCA1 gene as a therapeutic target for carboplatin, we investigated the functional consequences of the 3'-terminal region of human BRCA1 following in vitro platination with carboplatin. A reduction in cellular BRCA1 repair of carboplatin-treated plasmid DNA, using a host cell reactivation assay, was dependent on the platination levels on the reporter gene. The transcriptional transactivation activity of the drug-modified BRCA1, assessed using a one-hybrid GAL4 transcriptional assay, was inversely proportional to the carboplatin doses. The data emphasized the potential of the BRCA1 gene to be a target for carboplatin treatment.
authors.affiliation: Laboratory of Pharmaceutical Biotechnology, Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat-Yai, Songkhla, Thailand.
authors.forename: Adisorn
authors.initials: A
authors.lastname: Ratanaphan
authors.affiliation: Laboratory of Pharmaceutical Biotechnology, Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat-Yai, Songkhla, Thailand.
authors.forename: Bhutorn
authors.initials: B
authors.lastname: Canyuk
keywords: BRCA1; cancer chemotherapy; carboplatin; host cell reactivation; transcriptional activity