Abstract
Human papillomavirus type 16 (HPV16) early proteins E6 and E7 have been implicated in maintenance of the malignant phenotype in cervical cancer. Transforming growth factors beta one and two (TGF betas 1 and 2), polypeptides that regulate cellular growth and differentiation, reversibly inhibited expression of the HPV16 E6 and E7 genes in several immortal genital epithelial cell lines. Loss of E6 and E7 protein expression followed a dramatic time- and dose-dependent decrease in E6 and E7 RNA levels and was accompanied by cessation of cell proliferation. TGF betas 1 and 2 inhibited HPV16 RNA expression at the transcriptional level; inhibition was dependent upon ongoing protein synthesis. TGF betas 1 and 2 also induced a six- to sevenfold increase in TGF beta 1 RNA. Cells became partially resistant to the inhibitory effects of TGF beta 1 on cell growth and HPV early gene expression after prolonged cultivation in vitro or after malignant transformation. Thus, TGF beta 1 may function as an autocrine regulator of HPV gene expression in infected genital epithelial cells.
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Selected References
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