Abstract:
:Amplified in breast cancer 1 (AIB1) is a transcriptional coactivator for nuclear receptors and other transcription factors. AIB1 has an important role in malignancy of several cancers such as breast and prostate cancers. However, its involvement in human hepatocellular carcinoma (HCC) progression remains unclear. Here, we found that AIB1 protein was overexpressed in 23 of 34 human HCC specimens (68%). Down-regulation of AIB1 reduced HCC cell proliferation, migration, invasion, colony formation ability and tumorigenic potential in nude mice. These phenotypic changes caused by AIB1 knockdown correlated with increased expression of the cell cycle inhibitor p21(Cip1/Waf1) and decreased Akt activation and the expression of proliferating cell nuclear antigen (PCNA) and matrix metallopeptidase MMP-9. In agreement with these findings, clinical AIB1-positive HCC expressed higher levels of PCNA than AIB1-negative HCC. A positive correlation was established between the levels of AIB1 protein and PCNA protein in HCC, suggesting that AIB1 may contribute to HCC cell proliferation. In addition, MMP-9 expression in AIB1-postive HCC was significantly higher than that in AIB1-negative HCC, suggesting that AIB1-postive HCC may be more invasive. Collectively, our results show that overexpression of AIB1 promotes human HCC progression by enhancing cell proliferation and invasiveness. Therefore, AIB1 is a master regulator of human HCC growth and might be a useful molecular target for HCC prognosis and treatment.
journal_name
Oncogenejournal_title
Oncogeneauthors
Xu Y,Chen Q,Li W,Su X,Chen T,Liu Y,Zhao Y,Yu Cdoi
10.1038/onc.2010.90subject
Has Abstractpub_date
2010-06-10 00:00:00pages
3386-97issue
23eissn
0950-9232issn
1476-5594pii
onc201090journal_volume
29pub_type
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