title: Identification of GABA A receptor modulators in Kadsura longipedunculata and assignment of absolute configurations by quantum-chemical ECD calculations.
abstract: A petroleum ether extract of Kadsura longipedunculata enhanced the GABA-induced chloride current (I(GABA)) by 122.5±0.3% (n=2) when tested at 100 μg/ml in Xenopuslaevis oocytes expressing GABA A receptors (α(1)β(2)γ(2S) subtype) in two-microelectrode voltage clamp measurements. Thirteen compounds were subsequently identified by HPLC-based activity profiling as responsible for GABA A receptor activity and purified in preparative scale. 6-Cinnamoyl-6,7-dihydro-7-myrceneol and 5,6-dihydrocuparenic acid were thereby isolated for the first time. The determination of the absolute stereochemistry of these compounds was achieved by comparison of experimental and calculated ECD spectra. All but one of the 13 isolated compounds from K. longipedunculata potentiated I(GABA) through GABA A receptors composed of α(1)β(2)γ(2S) subunits in a concentration-dependent manner. Potencies ranged from 12.8±3.1 to 135.6±85.7 μM, and efficiencies ranged from 129.7±36.8% to 885.8±291.2%. The phytochemical profiles of petroleum ether extracts of Kadsura japonica fruits (114.1±2.6% potentiation of I(GABA) at 100 μg/ml, n=2), and Schisandra chinensis fruits (inactive at 100 μg/ml) were compared by HPLC-PDA-ESIMS with that of K. longipedunculata.
authors: Division of Pharmaceutical Biology, University of Basel, Basel, Switzerland.
authors: Janine
authors: J
authors: Zaugg
authors: Samad Nejad
authors: SN
authors: Ebrahimi
authors: Martin
authors: M
authors: Smiesko
authors: Igor
authors: I
authors: Baburin
authors: Steffen
authors: S
authors: Hering
authors: Matthias
authors: M
authors: Hamburger
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid; D018682:GABA Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D032135:Kadsura / Q000737:chemistry* / Q000378:metabolism; D009865:Oocytes / Q000187:drug effects; D018408:Patch-Clamp Techniques; D010936:Plant Extracts / Q000737:chemistry; D011963:Receptors, GABA-A / Q000737:chemistry*; D014982:Xenopus laevis
chemical_list: D018682:GABA Agents; D010936:Plant Extracts; D011963:Receptors, GABA-A