alexa Cytotoxic activity of indole alkaloids from Alstonia macrophylla.


Organic Chemistry: Current Research

Author(s): Keawpradub N, EnoAmooquaye E, Burke PJ, Houghton PJ

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Abstract Thirteen indole alkaloids isolated from the root bark of Alstonia macrophylla and a semisynthetic bisindole O-acetylmacralstonine have been assessed for cytotoxic activity against two human lung cancer cell lines, MOR-P (adenocarcinoma) and COR-L23 (large cell carcinoma), using the SRB assay. Pronounced cytotoxic activity was exhibited by the bisindoles on both cell lines. This suggests that, in comparison with the corresponding monomeric indoles, at least part of both the ring systems present in the bisindoles is essential for cytotoxic activity. The potent alkaloids were further tested against a human normal cell line (breast fibroblasts) and other human cancer cell lines including StMI1 1a (melanoma), Caki-2 (renal cell carcinoma), MCF7 (breast adenocarcinoma), and LS174T (colon adenocarcinoma). The bisindoles O-acetylmacralstonine, villalstonine and macrocarpamine were found to possess pronounced activity against cancer cell lines with IC50 values in the range of 2-10 microM, with no discernible cell-type selectivity. However, O-acetylmacralstonine displayed discernibly less toxicity against the normal breast fibroblasts. This article was published in Planta Med and referenced in Organic Chemistry: Current Research

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