Green Tea Polyphenols Cause Apoptosis and Autophagy in HPV-16 Subgene-Immortalized Human Cervical Epithelial Cells via the Activation of the Nrf2 Pathway. (26th November 2022)

• Record Type: Journal Article
• Authors: Tang, Yi; Chen, Quan; Chen, Jiaoquan; Mo, Ziyin; Li, Huaping; Peng, Liqian; Ke, Yanan; Liang, Bihua; Li, Runxiang; Zhu, Huilan
• Is Part Of: Nutrition and cancer. Volume 74:Number 10(2022)
• Page Start: 3769
• Page End: 3778
• Publication Date: 2022-11-26
• Subjects: Cancer -- Periodicals; Nutrition -- Periodicals; Cancer; Nutrition; Periodicals; 616.9940654
• DOI: 10.1080/01635581.2022.2093922
• Languages: English
• ISSNs: 0163-5581

Abstract

Abstract: Infection with human papillomavirus (HPV) is relatively common and certain high-risk HPV strains can induce epithelial dysplasia, increasing the risk of cervical cancer. Green tea polyphenol (GTP) preparations exhibit diverse anti-inflammatory, antioxidative, and antitumor properties In Vitro and In Vivo. Topical GTP application has been recommended as a treatment for genital warts, but the effect of GTP treatment on HPV infection and HPV-associated cancer remains to be established. The present study aimed to explore the mechanism by which GTP affected HPV type 16 (HPV-16)-positive immortalized human cervical epithelial cells. Survival, apoptosis, and autophagocytosis of these cells following GTP treatment was assessed using CCK-8 assay, flow cytometry, and monodansylcadaverine (MDC) staining. These cells were further transfected with an shRNA specific for Nrf2 to generate stable Nrf2-knockdown cells. The levels of Caspase-3, Bcl-2, Bax, P53, Rb, HPV-16 E6, HPV-16 E7, P62, Beclin1 and LC3B were determined via Western blotting. These analyses revealed that GTP treatment induced autophagy and apoptosis in HPV-16-positive cells, while Nrf2 gene knockdown reversed GTP-induced autophagic and apoptotic effects. Together, these results suggested that GTP could alleviate HPV infection and HPV-associated precancerous lesions In Vitro by regulating the Nrf2 pathway, highlighting the therapeutic potential of GTP in treating HPV infection.