Leptomycin B_product_DataBase

Bioactivity	Leptomycin B (CI 940; LMB) is a potent inhibitor of the nuclear export of proteins. Leptomycin B inactivates CRM1/exportin 1 by covalent modification at a cysteine residue. Leptomycin B is a potent antifungal antibiotic blocking the eukaryotic cell cycle[1].
Invitro	Leptomycin B (LMB) is very potent in vitro against various cancer cell lines (IC50 values in the 0.1 to 10 nM range). Leptomycin B (LMB) inhibits SiHa, HCT-116, and SKNSH cells with IC50s of 0.4, 0.3 and 0.4 nM for a 72 hour exposure, respectively[2].Leptomycin B (LMB) (0.5 nM) displays a synergistic effect on Gefitinib (0–32 μM)-induced cytotoxicity in A549 and H460 cell line. The simultaneous treatments of Gefitinib (0–32 μM) and Leptomycin B (0.5 nM) show synergistic cytotoxic effect on A549 as compared to Gefitinib alone at both 24 and 48 hours[3]. Cell Viability Assay[3] Cell Line:
Name	Leptomycin B
CAS	87081-35-4
Formula	C33H48O6
Molar Mass	540.73
Transport	Room temperature in continental US; may vary elsewhere.
Storage	-20°C, stored under nitrogen *In solvent : -80°C, 6 months; -20°C, 1 month (stored under nitrogen)

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