Abstract
A bioassay-guided fractionation of Salvia lachnostachys Benth leaf extract led to the isolation of three known diterpenes, namely fruticuline A (1), fruticuline B (2) and 7,20-dihydrofruticuline A (3), together with two new compounds, 4 and 5. The structures were mainly elucidated by 1D and 2D NMR spectroscopy and HRESIMS. The cytotoxic activity of the crude ethanol extract, the semi-purified fractions (A-E) and compounds 1, 2 and 4 were evaluated against seven human cancer cell lines and the normal cell line HaCat. The ethanol extract showed activity against all tested cell lines (GI50 25.0⿿44.0μg/mL). Among the fractions, the greatest activity was exhibited by fraction A (eluted with hexane), which inhibited the growth of all tested cell lines with GI50 of 3.9⿿19.5μg/mL. Compounds 1 and 4 were the most active, inhibiting the growth of U251, MCF-7, NCI-ADR/RES, 786.0, NCI-H460, PC-3, OVCAR-03 and HaCat cell lines with GI50<10μM. Compound 2 showed moderate activity against MCF-7, NCI-H460, OVCAR-03, K562 and HaCat, with GI50 varying 19.9⿿29.3μM.
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