Three Novel Sterols Isolated from Selaginella tamariscina with Antiproliferative Activity in Leukemia Cells

Abstract

Three new sterols, 3β,16α-dihydroxy-5α,17β-cholestan-21-carboxylic acid (1), 3β-acetoxy-16α-hydroxy-5α,17β-cholestan-21-carboxylic acid (2) and 3β-(3-hydroxybutyroxy)-16α-hydroxy-5α,17β-cholestan-21-carboxylic acid (3) were isolated from Selaginella tamariscina (Beauv.) Spring (Selaginellaceae). Their structures were elucidated based on NMR analyses. The growth inhibitory effects and differentiation induction abilities of compounds 1 - 3 were determined in human leukemia HL-60 cells. Compound 1 was more effective than compounds 2 and 3 in inhibiting cell growth, but compound 3 was more effective than compounds 1 and 2 in enhancing induction of all-trans-retinoic acid differentiation.

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