沉默信息调节分子SIRT1抑制剂，EX 527

生物活性

• 靶点	Sirtuin 1 IC50:38nM

• 描述EX 527 exhibits potently inhibitory effect against SIRT1 deacetylase activity in a concentration-dependent manner with an IC50 of 38 nM, displays much lower activity against SIRT2 and SIRT3 with IC50 values of 19.6 μM and 48.7 μM, respectively. EX 527 does not inhibit SIRT4-7 and class I/II HDAC activity at concentrations up to 100 μM. EX-527 alone (1 μM) has no detectable effect on the acetylation of p53 lysine 382 in NCI-H460 cells. EX-527 significantly increases the amount of acetylated p53 in NCI-H460 cells, human mammary epithelial cells, U-2 OS and MCF-7 cells subjected to genotoxic agents such as Etoposide, Doxorubicin, Hydroxyurea, and Hydrogen peroxide, which is more effective than that caused by Nicotinamide (5 mM). But surprisingly EX 527 does not result in detectable effects on p53-controled gene expression, cell survival, or cell proliferation. EX 527 causes a 90% increase in cell number of HCT116 cells after 7 days in the condition of 0.1% serum but not 10% serum, suggesting that SIRT1 is a significant regulator of cell proliferation during growth factor deprivation conditions. EX 527 abrogates resveratrol effects on glucose responses, and prevents resveratrol-induced up-regulation of Glut2, glucokinase, Pdx-1, and Tfam in INS-1E Cells, due to the opposite effect of EX 527 and resveratrol on SIRT1 deacetylase activity.
• 细胞研究
• Cell Data

  Cell Lines	Concentration	Assay Type	Time	Activity Description	Data Sources
  HEK 293	-	Growth Inhibition Assay	24 h	IC50=97.7 ± 8.1 μM	24998427
  HEK 293	-	Growth Inhibition Assay	48 h	IC50=69.0 ± 0.7 μM	24998427
  HeLa	-	Growth Inhibition Assay	24 h	IC50=37.9 ± 1.8 μM	24998427