Journal
CANCER LETTERS
Volume 460, Issue -, Pages 75-85Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.canlet.2019.06.015
Keywords
Cervical cancer; HPV; E7 oncogene; TGF-beta; miR-182
Categories
Funding
- Innovation and Technology Fund Hong Kong Special Administrative Region, China [UIM/230]
- Science and Technology Foundation of Shenzhen [JCYJ20170412155231633, JSGG20170414104216477, JCYJ20150402152130696]
- Shenzhen Public Service Platform on Tumor Precision Medicine and Molecular Diagnosis
- Shenzhen Cell Therapy Public Service Platform
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Accumulating experimental evidence has shown that the aberrant expression of microRNAs (miRNAs) is involved in the development and progression of human cervical cancer. Previously, we identified miR-182 as an oncomiRNA in cervical cancer. However, the mechanism by which miR-182 is regulated and the interaction between human papillomavirus (HPV) and miR-182 in cervical cancer development remains unknown. In the present study, we explored the link between HPV E7 and miR-182 and verified that high-risk HPV E7 upregulated miR-182 expression through TGF-beta/Smad4 signaling pathway in cervical cancer. By contrast, low-risk HPV E7 did not affect the expression of TGF-beta and miR-182. Mechanistically, as high-risk HPV E7 bound to pRb, E2F was released from the complex and bound to the TGF-beta promoter region, resulting in TGF-beta overexpression. Furthermore, the Smad4 signaling pathway was activated upon TGF-beta overexpression, which led to an interaction between Smad4 and the miR-182 promoter region, subsequently inducing the upregulation of miR-182 in both cervical cancer cells and the surrounding normal cells. In conclusion, this newly identified high-risk HPV E7/TGF-beta/miR-182 regulatory network might inform the development of specific therapeutic strategies for cervical cancer.
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