Abstract
Recently, SIRT1 was found to play an important role in a variety of solid and hematologic malignancies. The expression and function of SIRT1 may differ completely depending on cell type and gene subtype, and it can act as a tumor suppressor or oncogene. We describe how SIRT1 mRNA and protein levels are overexpressed in t(8;21) AML cells. AML1-ETO triggers the activation of SIRT1 by binding at AML1 binding sites on the SIRT1 promoter. Pharmacologic targeting or RNAi-mediated inhibition of SIRT1 induces G1 arrest, apoptosis, and proliferation inhibition that is more sensitive in AML1-ETO-positive than AML1-ETO-negative cell lines. Our data suggest that targeting SIRT1 may be an attractive therapeutic strategy in t(8;21) AML.
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