Phytochemistry and preliminary biological evaluation of Cyathostemma argenteum, a malaysian plant used traditionally for the treatment of breast cancer.
Bioassay guided fractionation of the roots of Cyathostemma argenteum using the brine shrimp resulted in the isolation of two uncommon flavanones, 2,5-dihydroxy-7-methoxy flavanone 1 and 2,5-dihydroxy-6,7-dimethoxy flavanone 2 while the stem bark yielded the related compounds 5-hydroxy-7-methoxy flavone 3 and 5-hydroxy-6,7-dimethoxy flavone 4. The alkaloids liriodenine 5 and discretamine 6 as well as benzyl benzoate 7 were isolated from the roots and 6 was also isolated from the stembark. In cytotoxicity tests using four human breast cancer cell lines, 1 and 2 were weakly toxic to MCF-7 cells (IC(50) = 19.6 and 19.0 microM, respectively) but showed little activity against MCF-7 cells resistant to doxorubicin or against two oestrogen receptor-deficient cell lines. Compound 5, but not 6 and 7, was moderately cytotoxic against all four cell lines. These results are discussed in the context of the traditional use of C. argenteum in the treatment of breast cancer.
Khamis
Shafii
S
Department of Pharmacy, University of Bradford, West Yorkshire BD7 1DP, UK.
Bibby
Michael C
MC
Brown
John E
JE
Cooper
Patricia A
PA
Scowen
Ian
I
Wright
Colin W
CW
D000818:Animals; D029061:Annonaceae; D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D001156:Artemia / Q000187:drug effects; D001943:Breast Neoplasms / Q000188:drug therapy / Q000473:pathology; D045744:Cell Line, Tumor / Q000187:drug effects; D005260:Female; D006801:Humans; D020128:Inhibitory Concentration 50; D008296:Malaysia; D008519:Medicine, Traditional; D008517:Phytotherapy; D010936:Plant Extracts / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D010938:Plant Oils / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use; D018517:Plant Roots
D000972:Antineoplastic Agents, Phytogenic; D010936:Plant Extracts; D010938:Plant Oils