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- W2185552507 abstract "Amino-adenosine (8-NH2-Ado)isaribosesugarnucleoside analoguethatreducescellularATPlevelsand inhibits mRNA synthesis. Estrogen receptor-negative (ER� ) metastatic breast cancers often contain mutant p53; therefore, we asked if 8-NH2-Ado could kill breast cancer cells without activating the p53-pathway. Regardless of the breast cancer subtype tested or the p53 status of the cells, 8-NH2-Ado was more cytotoxic than either gemcitabine or etoposide. 8-NH2-Ado treatment inhibited cell proliferation, activated cell death, and did not activate transcription of the p53 target gene p21 or increase protein levels of either p53 or p21. This occurred in the estrogen receptor-positive (ERþ) MCF-7 cells that express wild-type p53, the ERþ T47-D cells that express mutant p53, and the ERMDA-MB-468 cells or MDA-MB-231 cells that both express mutant p53. 8-NH2-Ado induced apoptotic death of MCF-7 cells and apoptosis was not inhibited by knockdown of functional p53. Moreover, the pan-caspase inhibitor Z-VAD blocked the 8-NH2-Ado-induced MCF-7 cell death. Interestingly, 8-NH2-Ado caused the MDA-MB-231 cells to detach from the plate with only limited evidence of apoptotic cell death markers and the cell death was not inhibited by Z-VAD. Inhibition of MDA- MB-231 cell autophagy, by reduction of ATG7 or 3-methyladenine treatment, did not block this 8-NH2-Ado- mediated cytotoxicity. Importantly 8-NH2-Ado was highly cytotoxic to triple-negative breast cancer cells and worked through a pathway that did not require wild-type p53 for cytoxicity. Therefore, 8-NH2-Ado should be considered for thetreatment of triple-negative breast cancers thatare chemotherapy resistant.MolCancer Ther; 11(11); 2495-504. � 2012 AACR." @default.
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- W2185552507 date "2012-01-01" @default.
- W2185552507 modified "2023-09-27" @default.
- W2185552507 title "8-Amino-AdenosineActivatesp53-IndependentCellDeathof Metastatic Breast Cancers" @default.
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