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Detection of ornithine decarboxylase mRNA in human breast cancer MCF-7 cells by in situ RT-PCR.

We have studied the expression of ornithine decarboxylase (ODC) mRNA by in situ hybridization and in situ RT-PCR in human breast cancer MCF-7 cell line. In situ RT-PCR demonstrated the overexpression of ODC mRNA, localized over the cytoplasm, while a very low signal was detected by in situ hybridization. Our findings indicate that in situ RT-PCR could represent a useful tool to study different levels of ODC expression in normal and tumor tissues. Since ODC expression is regulated by c-Myc oncoprotein, this model could be useful to monitor in vivo the effects of new anti-neoplastic molecules, specific inhibitors of c-Myc.