title: Isolation and identification from Salvia officinalis of two diterpenes which inhibit t-butylbicyclophosphoro[35S]thionate binding to chloride channel of rat cerebrocortical membranes in vitro.
abstract: Ethanolic extracts from dried leaves of sage (Salvia officinalis) showed inhibition of [35S]tertiary-butylbicyclophosphorothionate ([35S]TBPS) binding to rat brain membranes in vitro. This ligand is considered to bind to the chloride channel of the GABA/benzodiazepine receptor complex in brain tissue. Substances having inhibitory activity were purified and their chemical structure identified as the diterpenes carnosic acid and carnosol (IC50 values of 33 +/- 3 microM and 57 +/- 4 microM, respectively). The two compounds did not affect binding of the ligands [3H]muscimol and [3H]diazepam to the GABA/benzodiazepine complex in vitro. Saturation experiments of [35S]TBPS binding indicated that carnosic acid decreases the binding affinity.
authors.affiliation: Psychopharmacological Research Laboratory, Sct. Hans Hospital, Roskilde, Denmark.
authors.forename: D M
authors.initials: DM
authors.lastname: Rutherford
authors.forename: M P
authors.initials: MP
authors.lastname: Nielsen
authors.forename: S K
authors.initials: SK
authors.lastname: Hansen
authors.forename: M R
authors.initials: MR
authors.lastname: Witt
authors.forename: O
authors.initials: O
authors.lastname: Bergendorff
authors.forename: O
authors.initials: O
authors.lastname: Sterner
mesh_terms: D045784:Abietanes; D000818:Animals; D001643:Bridged Bicyclo Compounds / Q000378:metabolism*; D019086:Bridged Bicyclo Compounds, Heterocyclic; D002540:Cerebral Cortex / Q000187:drug effects / Q000378:metabolism*; D002712:Chlorides / Q000378:metabolism*; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D007473:Ion Channels / Q000187:drug effects / Q000378:metabolism*; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D013058:Mass Spectrometry; D010616:Phenanthrenes / Q000494:pharmacology; D010936:Plant Extracts / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D011869:Radioligand Assay; D051381:Rats; D011919:Rats, Inbred Strains; D011963:Receptors, GABA-A / Q000187:drug effects / Q000378:metabolism
chemical_list: D045784:Abietanes; D001643:Bridged Bicyclo Compounds; D019086:Bridged Bicyclo Compounds, Heterocyclic; D002712:Chlorides; D004224:Diterpenes; D007473:Ion Channels; D010616:Phenanthrenes; D010936:Plant Extracts; D011963:Receptors, GABA-A; C068623:carnosol; C037476:tert-butylbicyclophosphorothionate