AT13387, discovered by a high-throughput x-ray craystallography fragment-based platform, is a non-geldanamycin inhibitor of heat shock proterin 90 (HPS90), a molecule chaperone regulating signal transduction pathways for cell growth and survival. It has high affinity for binding HSP90 (Kd = 0.5nM) and exhibited an in vitro cytotoxicity showing a median EC50 value of 41 nM. The antitumor activity of AT13387 against solid tumor and leukemia models is similar to alvespimycin.

(2,4-dihydroxy-5-propan-2-ylphenyl)-[5-[(4-methylpiperazin-1-yl)methyl]-1,3-dihydroisoindol-2-yl]methanone

AT13387 is a potent inhibitor of the proliferat ion and survival of many different cell lines (such as MES-SA cell line) from a variety of different tumor types. Across a panel of 30 tumor cell lines, AT13387 potently inhibits cell proliferation with GI50 values in the range 13-260 nM. AT13387 inhibits proliferation of the non-tumorigenic human prostate epithelial cell line PNT2 with a GI50 value of 480 nM. The inhibition of a number of isolated kinases by AT13387 is also investigated including CDK 1, CDK 2, CDK4, FGFR3, PKB-b, JAK2, VEGFR2, PDGFRβ and Aurora B. None of the tested kinases are significantly inhibited at concentrations below 30 µM.

Soluble in DMSO

Store at or below –20°C. Solid form is stable at least 12 months from date of receipt, when stored as directed. Do not store aqueous solutions for more than one day.

Min H. et al. Pediatr Blood Cancer. 2012; 59(1): 185-188.

HSP Inhibitor

Inhibitor