CDDP induces p53-dependent apoptosis in tongue cancer cells |
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Authors: | Kanata H Yane K Ota I Miyahara H Matsunaga T Takahashi A Ohnishi K Ohnishi T Hosoi H |
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Affiliation: | Department of Otorhinolaryngology, NARA Medical University, Kashihara, Nara, Japan. jibika@nmu-gw.naramed-u.ac.jp |
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Abstract: | We have investigated the CDDP sensitivities of two tongue cancer cell lines with differing p53 genetic status, one with wild-type p53 (SAS) and the other with mutant-type p53 (HSC-4). SAS was about 2 times more sensitive at the D10 dose and demonstrated increased p53 and Bax protein levels at 10 h after CDDP treatment on Western blot analysis. On the other hand, overexpression of p53 in HSC-4 was observed without CDDP treatment and no elevation of Bax could be detected. Apoptosis was observed after CDDP treatment in SAS but not in HSC-4 by Hoechst 33342-staining and electrophoresis methods. These findings indicate that p53 plays an important role in apoptosis as a positive regulator of Bax expression. It is suggested that p53 status may have predictive potential with regard to response to CDDP therapy. |
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