miRISC inhibition causes mitotic defects and synergizes with genotoxic agents in cancers
Zhang, M.; Jiao, Z.; Cendon Florez., Y.; Lessel, I.; Yao, M. A.; Weigl, M.; Ozimek., M.; Dogruluk, T.; Chen, K.; Fernandez, K. C.; Vinagolu, R. K.; Popow, O.; Paulo, J. A.; Pradella, D.; Mishra, T.; Mastroleo, C.; Delgado., J. I.; DAmico, F. E.; Cavalieri, V.; Morris, C. D.; Tsou, M.-F. B.; Haigis, K. M.; Chauduri, J.; Benezra, R.; Vidigal, J. A.; Lessel, D.; Ventura, A.; La Rocca, G.
Show abstract
Although individual microRNAs (miRNAs) can have tumorigenic or tumor-suppressive properties, their overall role in cancer remains controversial. Here, we show that cancer tissues and cell lines are characterized by preferential accumulation of the high-molecular-weight miRNA-induced silencing complex (HMWR), the functionally active form of the effector complex responsible for miRNA-mediated gene repression. Experimentally induced disassembly of the HMWR impairs the growth of human tumor xenografts and of autochthonous tumors in mouse models of human cancer in vivo. Furthermore, disassembly of the HMWR increases chromosome mis-segregation, which synergized with genotoxic agents to potentiate cancer cell vulnerability and improve therapeutic response. These findings suggest pharmacologic inhibition of HMWR as a novel anti-cancer strategy.
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