2024-03-29T06:21:47Z
https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02011030
2023-08-03T05:32:49Z
1642838163960:1642838338003
1642838403551:1642838407795
Co-expression of low-risk HPV E6/E7 and EBV LMP-1 leads to precancerous lesions by DNA damage
Uehara, Karina
Tanabe, Yasuka
Hirota, Shintaro
Higa, Saki
Toyoda, Zensei
Kurima, Kiyoto
Kina, Shinichiro
Nakasone, Toshiyuki
Arasaki, Akira
Kinjo, Takao
Low-risk HPV
High-risk HPV
EBV LMP-1
Co-expression
Precancerous lesion
Background:Low-risk human papillomavirus (HPV), such as types 6 and 11, is considered non-oncogenic, but these types have been detected in oral cancer tissue samples, suggesting their possible involvement in oral carcinogenesis. Because double infection of high-risk HPV and Epstein-Barr virus (EBV) is known to be involved in oral carcinogenesis, we hypothesized that low-risk HPV and EBV co-infection can transform the oral cells. To verify our hypothesis, we evaluated the transformation activity of cell lines expressing both low-risk HPV E6/E7 and EBV LMP-1.\nMethods:We transduced HPV6, 11 and 16 E6/E7 genes and EBV LMP-1 gene into primary mouse embryonic fibroblasts. The cell lines were examined for indices of transformation activity such as proliferation, induction of DNA damage, resistance to apoptosis, anchorage-independent growth, and tumor formation in nude mice. To evaluate the signaling pathways involved in transformation, NF-κB and p53 activities were analyzed. We also assessed adhesion signaling molecules associated with anchorage-independent growth such as MMP-2, paxillin and Cat-1.\nResults:Co-expression of low-risk HPV6 E6 and EBV LMP-1 showed increased cell proliferation, elevated NF-κB activity and reduced p53 induction. Moreover, co-expression of low-risk HPV6 E6 and EBV LMP-1 induced DNA damage, escaped from apoptosis under genotoxic condition and suppression of DNA damage response (DDR). Co-expression of low-risk HPV11 E6/E7 and EBV LMP-1 demonstrated similar results. However, it led to no malignant characteristics such as anchorage-independent growth, invasiveness and tumor formation in nude mice. Compared with the cells co-expressing high-risk HPV16 E6 and EBV LMP-1 that induce transformation, co-expression of low-risk HPV6 E6 and EBV LMP-1 was associated with low MMP-2, paxillin and Cat-1 expression.\nConclusions:The co-expression of low-risk HPV E6/E7 and EBV LMP-1 does not induce malignant transformation, but it allows accumulation of somatic mutations secondary to increased DNA damage and suppression of DDR. Thus, double infection of low-risk HPV and EBV could lead to precancerous lesions.
論文
http://purl.org/coar/resource_type/c_6501
Springer Nature
2021-06-10
VoR
http://hdl.handle.net/20.500.12000/49986
1471-2407
BMC Cancer
1
21
eng
https://doi.org/10.1186/s12885-021-08397-0
https://doi.org/10.1186/s12885-021-08397-0
open access
© The Author(s). 2021
Creative Commons Attribution 4.0
https://creativecommons.org/licenses/by/4.0/