A new dihydroxanthenone from a plant-associated strain of the fungus Chaetomium globosum demonstrates anticancer activity

作者：Wijeratne E M Kithsiri; Turbyville Thomas J; Fritz Anne; Whitesell Luke; Gunatilaka A A Leslie^*

来源：Bioorganic & Medicinal Chemistry, 2006, 14(23): 7917-7923.

DOI：10.1016/j.bmc.2006.07.048

Bioassay-guided fractionation of a cytotoxic EtOAc extract of the fungal strain, Chaetomium globosum, inhabiting the rhizosphere of the Christmas cactus, Opuntia leptocaulis, of the Sonoran desert afforded a new dihydroxanthenone, globosuxanthone A (1), a new tetrahydroxanthenone, globosuxanthone B (2), two new xanthones, globosuxanthone C (3) and D (4), 2-hydroxyvertixanthone (5), and two known anthraquinones (6 and 7). The structures of the new compounds 1-4 were elucidated by NMR and MS techniques, and the relative stereochemistry of 1 was determined by X-ray crystallographic analysis. Of the compounds encountered, I was found to exhibit strong cytotoxicity against a panel of seven human solid tumor cell lines, disrupt the cell cycle leading to the accumulation of cells in either G(2)/M or S phase, and induce classic signs of apoptosis.

• 出版日期2006-12-1