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Structure and biological evaluation of novel cytotoxic sterol glycosides from a marine red alga Peyssonnelia sp.

Lin, A.S. and Engel, S. and Smith, B.A. and Fairchild, C.R. and Aalbersberg, William G.L. and Hay, M.E. and Kubanek, J. (2010) Structure and biological evaluation of novel cytotoxic sterol glycosides from a marine red alga Peyssonnelia sp. Bioorganic and Medicinal Chemistry, 18 (23). pp. 8264-8269. ISSN 0968-0896

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Abstract

Bioactivity-guided fractionation of the extract from a Fijian red alga Peyssonnelia sp. led to the isolation of two novel sterol glycosides 19-O-β-d-glucopyranosyl-19-hydroxy-cholest-4-en-3-one (1) and 19-O-β-d-N-acetyl-2-aminoglucopyranosyl-19-hydroxy-cholest-4-en-3-one (2), and two known alkaloids indole-3-carboxaldehyde (3) and 3-(hydroxyacetyl)indole (4). Their structures were characterized by 1D and 2D NMR and mass spectral analysis. The sterol glycosides inhibited cancer cell growth with mean IC50 values (for 11 human cancer cell lines) of 1.63 and 1.41 μM for 1 and 2, respectively. The most sensitive cancer cell lines were MDA-MB-468 (breast) and A549 (lung), with IC50’s in of 0.71–0.97 μM for 1 and 2. Modification of the sterol glycoside structures revealed that the α,β-unsaturated ketone at C-3 and oxygenation at C-19 of 1 and 2 are crucial for anticancer activity, whereas the glucosidic group was not essential but contributed to enhanced activity against the most sensitive cell lines.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science, Technology and Environment (FSTE) > Institute of Applied Science
Depositing User: Ms Mereoni Camailakeba
Date Deposited: 29 Nov 2010 14:57
Last Modified: 12 Jul 2012 21:13
URI: http://repository.usp.ac.fj/id/eprint/1895
UNSPECIFIED

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