M344

M344 shows a potent inhibition activity against histone deacetylase with IC50 of 100 nM. M344 produces a more significant effect on cell proliferation than on cell differentiation in MEL DS19 cells. M344 shows cell toxicity at concentrations above 10 μM, while a maximum of only 20% of the surviving cell population are induced to differentiate. In vitro, M344 produces the significant anti-proliferative effects on the endometrial cancer cell line Ishikawa and the ovarian cancer cell line SK-OV-3 with EC50 of 2.3 μM and 5.1 μM, respectively. While the normal human endometrial epithelial cells shows little sensitivity to M344. In addition, M344 also decreases proportion of cells in the S-phase, increases proportion in the G0/G1 phases of the cell cycle, induces apoptosis and decreases the transmembrane potential of mitochondria. M344 show the anti-proliferative activities against embryonal nervous system tumor cells including medulloblastoma cells (D341 Med, Daoy) and neuroblastoma cells (CH-LA 90,SHSY-5Y ) with GI50 of 0.65 μM, 0.63 μM, 0.63 μM and 0.67 μM, respectively.M344 (5 μM ) in combination with cisplatin (10 μg/mL) results increased induction of ATF3 and shows enhanced cytotoxic effects than cisplatin alone in a panel of human derived cancer cell lines, such as MCF-7, PC3, SK-OV3, and A549.