Abstract
The P53 tumor suppressor protein is a multifunctional transcription factor that prevents the malignant transformation of normal cells. In human malignancies, p53 is the most frequently altered gene and is mutated in approximately 50% of all malignancies. In contrast, p53 gene mutation has been rarely detected in feline malignancies, and most feline malignancies conceivably retain the wild-type p53 (wt-p53) gene. MDM2 negatively regulates the P53 protein by inhibiting its transcriptional activity and nuclear transport and by inducing its degradation. Inhibition of P53-MDM2 interaction stabilizes P53 protein and activates P53 pathway. Nutlin-3, a small molecule that inhibits P53-MDM2 interaction, was shown to have an antitumor effect in several human cancer cells retaining the wt-p53 gene. In the present study, we evaluated and compared the antitumor effect of nutlin-3 in 5 different feline lymphoma cell lines, of which 3 harbored wt-p53, and 2, mutated p53 (mt-p53). Treatment with nutlin-3 resulted in increased amounts of P53 protein in conjunction with augmented expression of P53-target genes in 3 feline lymphoma cell lines with the wt-p53 gene, but not in 2 feline lymphoma cell lines with the mt-p53 gene. Nutlin-3 treatment al...Continue Reading
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