Abstract
The E6 and E7 regions of human papillomavirus (HPV) type 16 were present in the DNA samples from cervical cancer cell lines, SKG-IIIa and SKG-IIIb, and those from cervical cancer tissues of three different patients. T601 cells, an NIH3T3 transformant obtained by transfection of DNA from a surgical specimen of a cervical cancer, also contained the E6 and E7 regions. The E6 region of HPV type 16 was expressed as mRNA in SKG-IIIa, SKG-IIIb and T601 cells. The E6 and E7 regions of HPV type 18 were present in the DNA samples from cervical cancer cell lines, SKG-I and SKG-II, and those from cervical cancer tissues of two different patients. SKG-I and SKG-II cells expressed the E6 region of HPV type 18 as mRNAs. These results strongly suggest that the E6 and E7 regions or the sequence surrounding these regions are important for maintaining malignant phenotype of cervical cancer cells.
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