Molecular targeted therapy by inducing cancer cell senesence

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A. We have cloned the NECCl gene from human chromosome 4 as a senescence inducing gene in choriocaracinoma cells. We investigated the placental anatomy of NECCl KO (-/-) mouse embryos. In the KO placeuta hypertrophy of giant cell layer and suppression of spongio-trophoblast layer formation were noticeable, respectively. NECCl expression was transiently detected in 8.5-11.5 dpc wild type mouse placenta. NECCl was involved in the negative regulation of differentiation from trophoblast stem cell to giant cell.B. We have cloned the EGLNl gene that has the potential to induce endometrial cancer cell senescence from lg42 region. EGLNl was a member of prolyl hydroxylase family and regulated HIF1 α protein degradation. Inhibition of HIFl α-mediated signaling by FIH or HIFlsiRNA also induced the cancer cell senescence. Overexpression of EGLNl in endometrial cancer cells was able to induce cell senescence through upregulation of p21 CDK ihibitor.C. We found the ER α activation by the oncogenic K-Ras mutant. Expression of PR or dominant-negative ER mutant elicited the cancer cell senescence. ER α inactivation resulted in the downregulation of MDM2 followed by p53 activation and subsequent p21 upregulation. We have demonstrated the efficacy of new therapies targetted i)functional inactivation of ER α and ii)suppression of MDM2 protein expression, respectively.D. We have demonstrated the anti-tumor activity of Sodium Butyrate and Valproic acid that are HDAC inhibitors. Both agents were able to induce cancer cell senescence through p21 upregulation. This effect was independent of p53. Now we are planning the clinical research by using Valproic acid.