Effects of acacetin on Sirt1 and the dominant signal molecules. A, Western blots and relative level of Sirt1 in rat cardiomyoblasts in the absence and presence of 0.3, 1 or 3 μM acacetin. B, Western blots and mean relative levels of Sirt1 in rat cardiomyoblasts treated with 1 μM doxorubicin in the absence and presence of 0.3, 1 or 3 μM acacetin. C, Western blots and mean relative levels of pAMPK in rat cardiomyoblasts with the same treatment as in B. D, Western blots and mean relative levels of pLKB in rat cardiomyoblasts with the same treatment as in B. E, Western blots and relative level of pLKB and total LKB (t‐LKB) in rat cardiomyoblasts transfected with control siRNA or Sirt1 siRNA in the absence (V, vehicle) or presence of 3 μM acacetin. F, Western blots and relative level of pAMPK and total AMPK (t‐AMPK) in rat cardiomyoblasts transfected with control siRNA or Sirt1 siRNA and treated as in E. G, Western blots and relative level of Nrf2 in rat cardiomyoblasts with the same treatment as in E. H, Western blots and relative level of nuclei Nrf2 in rat cardiomyoblasts with the same treatment as in E. I, Relative Nrf2 mRNA level measured with real‐time PCR in rat cardiomyoblasts with the same treatment as in E. (n = 5 individual experiments, *
P < 0.05, **
P < 0.01 vs control or vehicle of control siRNA; #
P < 0.05, ##
P < 0.01 vs control siRNA with acacetin)