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Mutation or inactivation of the p53 tumor suppression gene is an early alteration in the transformation of glial cells to gliomas. To study the effect of exogenous wild-type p53 on glioma cell growth, human glioma lines U251 MG, U87 MG and A172 were infected with an adenovirus vector expressing either wild-type p53 or bacterial lacZ. Rapid cell death occurred only in the p53-transduced cell lines and was characterized by nuclear condensation, formation of nucleosomal DNA ladders, and positive in situ end-labeling of DNA, suggesting that apoptosis had been induced. The U87 MG cell line that contains wild-type p53 as evidenced by wild-type p53-dependent transcription activity also underwent apoptosis within 2 to 3 days after infection. These results suggest that the presence of endogenous wild-type p53 does not preclude apoptosis by overexpression of exogenous p53.

Adenovirus-mediated Wild-type p53 Gene Transfer and Overexpression Induces Apoptosis of Human Glioma Cells Independent of Endogenous p53 Status