title: Aberrant transforming growth factor beta1 signaling and SMAD4 nuclear translocation confer epigenetic repression of ADAM19 in ovarian cancer.
abstract: Transforming growth factor-beta (TGF-beta)/SMAD signaling is a key growth regulatory pathway often dysregulated in ovarian cancer and other malignancies. Although loss of TGF-beta-mediated growth inhibition has been shown to contribute to aberrant cell behavior, the epigenetic consequence(s) of impaired TGF-beta/SMAD signaling on target genes is not well established. In this study, we show that TGF-beta1 causes growth inhibition of normal ovarian surface epithelial cells, induction of nuclear translocation SMAD4, and up-regulation of ADAM19 (a disintegrin and metalloprotease domain 19), a newly identified TGF-beta1 target gene. Conversely, induction and nuclear translocation of SMAD4 were negligible in ovarian cancer cells refractory to TGF-beta1 stimulation, and ADAM19 expression was greatly reduced. Furthermore, in the TGF-beta1 refractory cells, an inactive chromatin environment, marked by repressive histone modifications (trimethyl-H3K27 and dimethyl-H3K9) and histone deacetylase, was associated with the ADAM19 promoter region. However, the CpG island found within the promoter and first exon of ADAM19 remained generally unmethylated. Although disrupted growth factor signaling has been linked to epigenetic gene silencing in cancer, this is the first evidence demonstrating that impaired TGF-beta1 signaling can result in the formation of a repressive chromatin state and epigenetic suppression of ADAM19. Given the emerging role of ADAMs family proteins in growth factor regulation in normal cells, we suggest that epigenetic dysregulation of ADAM19 may contribute to the neoplastic process in ovarian cancer.
authors: Human Cancer Genetics Program, Comprehensive Cancer Center, Ohio State University, Columbus, OH 43210-1234, USA.
authors: Michael Wy
authors: MW
authors: Chan
authors: Yi-Wen
authors: YW
authors: Huang
authors: Corinna
authors: C
authors: Hartman-Frey
authors: Chieh-Ti
authors: CT
authors: Kuo
authors: Daniel
authors: D
authors: Deatherage
authors: Huaxia
authors: H
authors: Qin
authors: Alfred Sl
authors: AS
authors: Cheng
authors: Pearlly S
authors: PS
authors: Yan
authors: Ramana V
authors: RV
authors: Davuluri
authors: Tim H-M
authors: TH
authors: Huang
authors: Kenneth P
authors: KP
authors: Nephew
authors: Huey-Jen L
authors: HJ
authors: Lin
mesh_terms: D051722:ADAM Proteins / Q000378:metabolism*; D015153:Blotting, Western; D015536:Down-Regulation; D005260:Female; D006801:Humans; D010051:Ovarian Neoplasms / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D051901:Smad4 Protein / Q000378:metabolism*; D053773:Transforming Growth Factor beta1 / Q000378:metabolism*; D014178:Translocation, Genetic
chemical_list: C497796:SMAD4 protein, human; D051901:Smad4 Protein; D053773:Transforming Growth Factor beta1; D051722:ADAM Proteins; C411902:ADAM19 protein, human