期刊
CANCER RESEARCH
卷 71, 期 21, 页码 6696-6707出版社
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/0008-5472.CAN-11-1271
关键词
-
类别
资金
- Yong Loo Lin School of Medicine, National University Health System, National University of Singapore
- BMRC-A*STAR, Singapore [R-183-000-164-305]
- NMRC-A*STAR, Singapore [R-183-000-293-213]
- Academic Research Fund Tier 1 [R-183-000-286-112]
- Ministry of Education Academic Research [R-183-000-195-112]
Human papillomavirus (HPV) is the primary cause of human cervical cancer. The viral proteins E6 and E7 are essential to transform noncancerous epithelial cells into cancerous carcinomas by targeting key tumor suppressors p53 and retinoblastoma (Rb) proteins, respectively, but the cellular factors involved in E6 and E7 transcription themselves are incompletely understood. In this study, we defined a novel isoform of the mixed lineage leukemia 5 gene (MLL5 beta) as a specific and critical regulator of E6 and E7 transcription in cervical carcinoma cells. MLL5 beta b is present in HPV16/18-positive cells including human primary cervical carcinoma specimens. Interaction of MLL5 beta with the AP-1-binding site at the distal region of the HPV18 long control region led to activation of E6/E7 transcription. Conversely, RNA interference-mediated knockdown of MLL5 beta down-regulated both E6 and E7 expression. MLL5 beta downregulation was sufficient to restore p53 protein levels and reduce Rb phosphorylation, thereby reactivating apoptosis and cell-cycle checkpoints. By defining this novel MLL5b isoform and its specific critical role in activating E6/E7 gene transcription in HPV16/18-induced cervical cancers, our work highlights the potential of MLL5 beta as a biomarker and new therapeutic target in primary HPV-induced cervical cancers. Cancer Res; 71(21); 6696-707. (C)2011 AACR.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据