OncoTargets and Therapy (May 2020)
Interfering Human Papillomavirus E6/E7 Oncogenes in Cervical Cancer Cells Inhibits the Angiogenesis of Vascular Endothelial Cells via Increasing miR-377 in Cervical Cancer Cell-Derived Microvesicles
Abstract
Ying Zhang,1 Yao Liu,2 Xingrong Guo,2 Zhenhua Hu,1 Huirong Shi1 1Department of Gynaecology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450000, People’s Republic of China; 2Department of Gynaecology, Hami Central Hospital, Hami, Xinjiang 839000, People’s Republic of ChinaCorrespondence: Huirong ShiDepartment of Gynaecology, The First Affiliated Hospital of Zhengzhou University, No. 1 Jianshe East Road, 27 District, Zhengzhou City, Henan Province 450052, People’s Republic of ChinaEmail [email protected]: The dysregulation of the human papillomavirus 18 E6 and E7 oncogenes plays a critical role in the angiogenesis of cervical cancer (CC), including the proliferation, migration, and tube formation of vascular endothelial cells. Interfering E6/E7 increases the number of CC cell-derived microvesicles (CC-MVs). Additionally, microRNAs (miRNAs) can modulate CC angiogenesis and can be encapsulated in MVs.Objective: We aim to investigate whether E6/E7 affects CC angiogenesis via regulating miRNAs in CC-MVs.Methods: CC-MVs were isolated from a CC cell line (HeLa) which were transfected with small interfering RNAs (siRNAs) against E6/E7 or co-transfected with miR-377 mimics/inhibitors. The expression of several miRNAs in CC-MVs was detected using quantitative real-time PCR. After co-incubating CC-MVs with human umbilical vein endothelial cells (HUVECs), cell proliferation, migration, and tube formation of HUVECs were determined using cell counting kit-8, transwell, and tube formation assays, respectively.Results: MiR-377 was increased in E6/E7-interfering CC-MVs. Overexpressing miR-377 in CC-MVs suppressed HUVEC proliferation, migration, and tube formation. LPAR2, the cell surface G protein-coupled receptor, was the downstream target of miR-377 in HUVECs. The co-transfection of E6/E7 siRNAs and miR-377 inhibitors in CCs negated the effect of E6/E7 siRNAs on the elevation of miR-377 in CC-MVs. In HUVECs, the co-transfection of E6/E7 siRNAs and miR-377 inhibitors restored the LPAR2 expression which was reduced by the E6/E7 siRNA transfection. Meanwhile, miR-377 mimic reduced LPAR2 expression and inhibited HUVEC proliferation, migration, and tube formation, while such response was negated by LPAR2 overexpression.Conclusion: Interfering E6/E7 increased miR-377 in CC-MVs, and overexpressing miR-377 in CC-MVs inhibited angiogenesis of HUVECs via reducing LPAR2.Keywords: human papillomavirus E6/E7, microvesicle, miR-377, LPAR2, angiogenesis
