title: Fukinolic acid derivatives and triterpene glycosides from black cohosh inhibit CYP isozymes, but are not cytotoxic to Hep-G2 cells in vitro.
abstract: Black cohosh (Actaea racemosa L. [syn. Cimifuga racemosa L.]) extracts (BCE) are marketed worldwide for the management of menopausal symptoms. However, recently more than 75 cases of hepatotoxicity associated with black cohosh ingestion have been reported. While these cases have not been fully substantiated for causality, the data suggest that herb-drug interactions may be involved rather than a direct hepatotoxic event. This work describes the in vitro inhibition of four CYP450 enzymes (1A2, 2D6, 2C9, 3A4) by black cohosh extracts and identifies the active inhibitory constituents. Ethanol extracts (75 and 80% ethanol) and a 40% isopropanol extract induced a concentration-dependent inhibition of all CYP450 isozyme activities, with median inhibitory concentrations (IC(50)) ranging from 21.9 microg/ml to 65.0 microg/ml. Isolation of the active chemical constituents, showed that the triterpene glycosides were weakly active (IC(50) 25-100 microM), while fukinolic acid and cimicifugic acids A and B strongly inhibited all CYP isozymes (IC(50) 1.8-12.6 microM). None of the extracts inhibited the growth of Hep-G2 cells in concentrations up to 50 microg/ml. These data suggest that BCEs are not directly hepatotoxic, but may have the potential to induce herb-drug interactions, which may in turn explain the rare cases of hepatotoxicity observed in women using multiple medications and dietary supplements, including black cohosh.
authors.affiliation: Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, 833 S. Wood St, Chicago, IL 60612, USA.
authors.forename: Yue
authors.initials: Y
authors.lastname: Huang
authors.forename: Bei
authors.initials: B
authors.lastname: Jiang
authors.forename: Paiboon
authors.initials: P
authors.lastname: Nuntanakorn
authors.forename: Edward J
authors.initials: EJ
authors.lastname: Kennelly
authors.forename: Stacy
authors.initials: S
authors.lastname: Shord
authors.forename: Temitope O
authors.initials: TO
authors.lastname: Lawal
authors.forename: G B
authors.initials: GB
authors.lastname: Mahady
mesh_terms: D002109:Caffeic Acids / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D031885:Cimicifuga; D065607:Cytochrome P-450 Enzyme Inhibitors; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism; D003603:Cytotoxins / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D005260:Female; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D056945:Hep G2 Cells; D006801:Humans; D007527:Isoenzymes / Q000037:antagonists & inhibitors / Q000378:metabolism; D008099:Liver / Q000187:drug effects / Q000201:enzymology / Q000473:pathology; D008593:Menopause / Q000187:drug effects / Q000378:metabolism; D010648:Phenylacetates / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D018517:Plant Roots; D027343:Rhizome; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*
chemical_list: D002109:Caffeic Acids; D065607:Cytochrome P-450 Enzyme Inhibitors; D003603:Cytotoxins; D006027:Glycosides; D007527:Isoenzymes; D010648:Phenylacetates; D010936:Plant Extracts; D014315:Triterpenes; D003577:Cytochrome P-450 Enzyme System; C116090:fukinolic acid
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