Abstract
Myeloma poses a serious risk for people's health and life quality. Molecular targeted treatment of myeloma emerges as a promising therapy. This study aimed to determine the effect of Sirtuin 6 on myeloma KM-HM_(31) cell aging and provide evidence for clinical treatment. Myeloma KM-HM_(31) cell aging model induced by Carbamide peroxide (CP) was generated. Cells were transfected with Sirtuin 6 over-expression plasmid and specific siRNA. Western blot was used to study Sirtuin 6 expression, P53, P16, and Hippo in KM-HM_(31) cells. β-galactosidase assay was applied to measure cell aging. Verteporfin inhibited Hippo signal pathway and measured aging of KM-HM_(31) cells. The levels of Sirtuin 6, aging protein P53, and P16 were remarkably elevated while Hippo expression was significantly inhibited in CP-induced KM-HM_(31) cells. Transfection of Sirtuin 6 over-expression plasmid enhanced Sirtuin 6 expression in KM-HM_(31) cells and potentiated cell aging with downregulation of Hippo protein. In contrast, a block of Sirtuin 6 resulted in the opposite effect. Moreover, Verteporfin inhibited Hippo signal pathway and enhanced CP-induced KM-HM_(31) cell aging, which contributed similar effect as Sirtuin 6 did. We showed that sirtuin 6 facilitates CP-induced myeloma cell KM-HM_(31) aging via suppressing Hippo.
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