Abrogation of p53 function by HPV16 E6 gene delays apoptosis and enhances mutagenesis but does not alter radiosensitivity in TK6 human lymphoblast cells.

Journal Article (Journal Article)

In order to gain a better understanding of the role of p53 in radiation-induced mitotic failure, apoptosis and mutagenesis, we introduced the HPV16 E6 gene via a retroviral vector into the TK6 human lymphoblast cell line which expresses wild type p53. Abrogation of p53 function by E6 resulted in a delayed and reduced apoptotic response and a moderate increase in the frequency of mutations at the thymidine kinase (tk) locus following gamma-irradiation, but failed to alter radiosensitivity. The apoptotic response of the E6-transduced line was intermediate between that of wild type TK6 and the WTK1 cell line. WTK1 is derived from the same parental cell line as TK6 but expresses mutant p53. The spontaneous and gamma-ray-induced mutation frequencies in E6-transduced TK6 cells, although higher than that of the parental TK6 cell line, were still much lower than that of the WTK1 line. No effect on apoptosis, radiosensitivity or mutability was observed when the HPV16 E6 gene was introduced into the WTK1 cells. These results indicate that p53 does not regulate the radiosensitivity of TK6 cells through the apoptotic pathway. Furthermore, the previously observed enhanced radioresistance and mutability in WTK1 cells must be attributed to a more complex mechanism than p53 status alone.

Full Text

Duke Authors

Cited Authors

  • Yu, Y; Li, CY; Little, JB

Published Date

  • April 10, 1997

Published In

Volume / Issue

  • 14 / 14

Start / End Page

  • 1661 - 1667

PubMed ID

  • 9135067

International Standard Serial Number (ISSN)

  • 0950-9232

Digital Object Identifier (DOI)

  • 10.1038/sj.onc.1201026


  • eng

Conference Location

  • England