AIM: In an effort to identify novel, small molecules which can affect the proliferation of lung cancer cells, F-01A, a polyether antibiotic isolated from the fermentation broth of Streptomyces was tested. METHOD: F-01A was tested for its antitumor properties on the lung cancer cell line SPC-A-1, at six doses(0.1, 0.5, 1, 2.5, and 5 μmol·L-1), using various cellular assays. Cell viability was measured by the MTT assay, Hochest 33258 was used to study nuclear morphology; DNA ladder and the loss of mitochondrial membrane potential were also evaluated. RESULTS: F-01A induces apoptosis against SPC-A-1 cells in a dose-dependent manner. The IC50 is 0.65 μmol·L-1, and the inhibition at 5 μmol·L-1 is 87.89%. Further, JC-1 staining indicates F-01A could induce the loss of mitochondrial membrane potential, and the DNA fragment is evident. CONCLUSION: Mechanistic analysis showed that F-01A induced apoptosis of cancer cells probably in the mitochondrial pathway. The antitumor actions of F-01A involve activation of the apoptotic pathway against SPC-A-1 cells, and it may be valuable for further drug development.
WANG JingWU Xiao-PengSONG Xin-MingHAN Chang-RiCHEN ZhongCHEN Guang-Ying
Objective To study the chemical constituents from the barks of Lannea coromande/ica. Methods The chemical constituents were isolated and purified by column chromatography on silica gel column. NMR spectra were used for structural identification. Results Thirteen compounds were isolated and identified as quercetin （1）, （2S,3S,4R, lOLg-2-[（2＂R）-2＇-hydroxytetracosanoyl amino]-10-octadecene-l,3,4- triol （2）, aralia cerebroside （3）, 5,5＇-dibuthoxy-2,2＇-bifuran （4）, ^-sitosteryl- 3^-glucopyranoside-6＇-O-palmitate （5）, B-sitosterol palmitate （6）, myricadiol （7）, protocatechuic acid （8）, p-hydroxybenzoic acidethyl ester （9）, isovanillin （10）, trans- cinnamicacid （I 1）, palmiticacid （12）, and stearicacid （13）. Conclusion Compounds 2-13 are isolated from this plant for the first time.
