Chromosome region maintenance 1 (CRM1) is a major nuclear export receptor that mediates the transport of proteins and mRNAs. KPT-330 is a selective inhibitor of CRM1 which shows cytotoxic activity with a median IC50 value of 123 nM in a characterized cell penal with 23 cell lines[1]. In both STO and MesoII cells, the treatment of 1 μM KPT-330 markedly increased the accumulation of G1phase at 48 hours after the exposure, and reached a maximum at 72 hours. STO cells demonstrated a high sensitivity to KPT-330 with an IC50 of 0.7 μM, whereas MesoII cells with IC50 of 0.35 μM[2]. KPT-330 at the concentration between 0.1 μM–1 μM induced growth inhibition dose-dependently in eleven NSCLC cell lines. KPT-330 at 1 μM also stimulated the activation of caspase-3 and caspase-9, as well as the protein levels of several pro-apoptotic mediators, including Bax, Bim, and Puma in NSCLC cells. When evaluating the tumor volume of H1975 NSCLC cells engrafted in NOD/SCID mice, KPT-330 treatment (10 mg/kg, twice weekly for 4 weeks) markedly inhibited tumor growth compared with vehicle-treated controls[3].
作用机制
KPT-330 inactivates CRM1 by modifying the critical CRM1-binding residue, thereby irreversibly inhibiting CRM1-mediated nuclear export of proteins and mRNAs[4].
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