RESUMO
Objective To screen the active compounds targeting lung cancer stem cells (LCSCs) from the sponge Aaptos aaptos.Methods The A549-Nanog-GFP model of LCSCs was constructed.Western blot and immunofluorescence were used to examine the expression of pluripotency markers in screening model.The established LCSCs model was used to screen 8 fractions of Aaptos aaptos dichloromethane extract.The active fraction was separated by various chromatographic methods.CCK8 assay was used to screen the compounds for anti-LCSCs activity in vitro.Results LCSCs model with high expression of CD44 and ALDH1A1 protein was successfully constructed.The fraction D6 showed significant inhibitory activity in LCSCs(P<0.01).Four aaptamine alkaloids were isolated from this fraction.Compound AP-1 has good activity against LCSCs(P<0.01)with IC50 value(3.84±0.12) μmol/L.Conclusion AP-1 isolated from the spongeAaptos aaptos exhibited significant activity against LCSCs.