[Intervention of ERRα Expression on Apoptosis Induction of Multiple Myeloma MM.1S Cells Cultured in Vitro].

OBJECTIVE:To investigate the effect of two different approaches ERRα strategy on the apoptosis in multiple myeloma cell line MM.1S. METHODS:For the one strategy, shRNA was mediated by lentivirus. Stable cell clones were established by transfecting the lentivirus into MM.1S cells and screened by puromycin. For the other strategy, XCT790, a specific reverse agonist of ERRα, was used to treat MM.1S cells. The apoptosis of the cells was analyzed by flow cytometry after ERRα was down-regulated. Western blot assay was used to detect the apoptosis of related proteins. RESULTS:The knocked down ERRα was achieved, lentivirus with shERRα were successfully infected into MM.1S and ERRα was reduced significantly. Knockdown of ERRα could induce MM.1S cell apoptosis dramatically. Meanwhile, the expression of cleaved PARP (a kind of apoptosis related markers) was significantly increased following depletion of ERRα in MM.1S cells. XCT790 could significantly down-regulate the expression of ERRα protein in MM.1S cells, which was consistent with the effect caused by shRNA. CONCLUSION:Interference the expression of ERRα by shRNA or XCT790 can induce apparent apoptosis in MM.1S cells, which indicating that ERRα is crucial for the survival of myeloma cells.