A systematic study has been performed using a series of differentiated rat thyroid epithelial cell lines either uninfected or infected with Kirsten murine sarcoma virus (KiMSV), to determine the levels of the p21 product of the oncogene in transformed and normal cell lines. The p21 levels have been assayed by SDS-polyacrylamide gel electrophoresis of immunoprecipitates of S-labelled cell extracts and by a GDP binding assay. All cell lines analysed showed a significant increase in the levels of p21 after transformation with KiMSV compared to the p21 levels of uninfected and untransformed differentiated thyroid cells. The results reported here confirm the potential ability of the oncogene product to transform epithelial cells. They show, furthermore, that not only is p21 present in some epithelial cells transformed by KiMSV, but also that it is functionally active, as has been shown for fibroblasts transformed by the same virus, and that its functioning is maintained after passaging of the transformed cells.

Keyword(s): epithelial , KiMSV , p21 and thyroid

Article metrics loading...

Loading full text...

Full text loading...


Most cited this month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error