Aporphine and tetrahydroprotoberberine alkaloids from the leaves of Guatteria friesiana (Annonaceae) and their cytotoxic activities

Phytochemical investigation of the leaves of Guatteria friesiana (Annonaceae) afforded three new isoquinoline alkaloids, 13-hydroxy-discretinine, 6,6a-dehydroguatteriopsiscine and 9-dehydroxy-1-methoxy-dihydroguattouregidine. Eight known alkaloids were also isolated, 13-hydroxy-2,3,9,10-tetramethoxyprotoberberine, guatteriopsiscine, lysicamine, liriodenine, atherospermidine, lanuginosine, 7,8-dihydro-8-hydroxypalmatine and palmatine. 13-Hydroxy-2,3,9,10-tetramethoxyprotoberberine was only obtained by synthesis and is being reported as a natural product for the first time. The structures of the isolated alkaloids were established by extensive analysis of 1D and 2D nuclear magnetic resonance (NMR) and mass spectrometric (MS) data, as well as by comparison with data reported in the literature. The in vitro cytotoxic activity of the major alkaloids was evaluated against tumor and non-tumor cell lines. All of the alkaloids evaluated were determined to be inactive based on National Cancer Institute (NCI/USA) criteria. However, the alkaloid palmatine exhibited a cytostatic effect on MCF-7 (breast) and U251 (glioma) human tumor cell lines, with GI50 values lower than 20.0 µmol L-1 (10.5 and 16.2 µmol L-1, respectively), suggesting a selective cytotoxic action.

Bibliographic Details

Main Authors:	Costa,Emmanoel Vilaça, Cruz,Pedro Ernesto O. da, Pinheiro,Maria Lúcia B., Marques,Francisco A., Ruiz,Ana Lúcia T. G., Marchetti,Gabriela M., Carvalho,João Ernesto de, Barison,Andersson, Maia,Beatriz Helena L. N. S.
Format:	Digital revista
Language:	English
Published:	Sociedade Brasileira de Química 2013
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532013000500011
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