Article ; Online: Brd4 inhibition suppresses HPV16 E6 expression and enhances chemoresponse: A potential new target in cervical cancer therapy.
International journal of cancer
2019 Volume 144, Issue 9, Page(s) 2330–2338
Abstract: Although a vast amount of research underlines the roles of the HR HPV E6 and E7 oncogenes in HPV-induced carcinogenesis of cervical cancer, it remains unclear whether these oncogenes are also involved in the resistance of the cancer against chemotherapy. ...
Abstract | Although a vast amount of research underlines the roles of the HR HPV E6 and E7 oncogenes in HPV-induced carcinogenesis of cervical cancer, it remains unclear whether these oncogenes are also involved in the resistance of the cancer against chemotherapy. We examined the role of the HPV16 E6 oncogene in cisplatin resistance by analyzing its expression in newly established cisplatin-sensitive versus -resistant cervical cancer cell lines (CC7, CC10). Resistant variants were obtained by interval exposure treatment with 1-2 μM cisplatin for 8-9 months. Our results demonstrate that the expression level of HPV16 E6 directly correlates with the extent of cisplatin resistance in novel as well as established (SiHa) drug resistant cervical cancer cell lines. Overexpression of HPV16 E6 in cisplatin-naïve cells rendered these cells more resistant to cisplatin. Reducing E6 expression by JQ1 treatment reversed the drug resistant phenotype and strongly enhanced chemoresponse only in HPV-positive cisplatin-resistant variants and not in HPV-negative C33A cervical cancer cells. The level of E6 directly correlated with the extent of cisplatin sensitivity and was shown to be increased in newly established drug-resistant cell line variants, while reducing E6 expression using Brd4-inhibitors enhanced chemoresponse when co-delivered with cisplatin. Inhibition of Brd4 could represent a new therapeutic option by increasing treatment response in cervical cancer cells and might allow lower cisplatin dosages, thus reducing negative side effects. |
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MeSH term(s) | Antineoplastic Agents/therapeutic use ; Azepines/pharmacology ; Cell Line, Tumor ; Cisplatin/therapeutic use ; Drug Resistance, Neoplasm/physiology ; Female ; Human papillomavirus 16/metabolism ; Humans ; Nuclear Proteins/antagonists & inhibitors ; Oncogene Proteins, Viral/biosynthesis ; Repressor Proteins/biosynthesis ; Transcription Factors/antagonists & inhibitors ; Triazoles/pharmacology ; Uterine Cervical Neoplasms/therapy ; Uterine Cervical Neoplasms/virology |
Chemical Substances | (+)-JQ1 compound ; Antineoplastic Agents ; Azepines ; BRD4 protein, human ; E6 protein, Human papillomavirus type 16 ; Nuclear Proteins ; Oncogene Proteins, Viral ; Repressor Proteins ; Transcription Factors ; Triazoles ; Cisplatin (Q20Q21Q62J) |
Language | English |
Publishing date | 2019-01-16 |
Publishing country | United States |
Document type | Journal Article ; Research Support, Non-U.S. Gov't |
ZDB-ID | 218257-9 |
ISSN | 1097-0215 ; 0020-7136 |
ISSN (online) | 1097-0215 |
ISSN | 0020-7136 |
DOI | 10.1002/ijc.31986 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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