title: Compounds extracted from Phyllantus and Jatropha elliptica inhibit the binding of [3H]glutamate and [3H]GMP-PNP in rat cerebral cortex membrane.
abstract: Glutamate is to be considered a nociceptive neurotransmitter and glutamatergic antagonists present antinoceptive activity. In this study we investigated the effects of the naturally occurring antinociceptive compounds rutin, geraniin and quercetine extracted from Phyllanthus, as well as the diterpene jatrophone, extracted from Jatropha elliptica on the binding of [3H]glutamate and [3H]GMP-PNP [a GTP analogue which binds to extracellular site(s), modulating the glutamatergic transmission] in rat brain membrane. Jatrophone inhibited [3H]glutamate binding and geraniin inhibited [3H]GMP-PNP binding. Quercetine inhibited the binding of both ligands. These results may indicate a neurochemical parameter possibly related to the antinoceptive activity of these natural compounds.
authors.affiliation: Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
authors.forename: L H
authors.initials: LH
authors.lastname: Martini
authors.forename: C R
authors.initials: CR
authors.lastname: Souza
authors.forename: P B
authors.initials: PB
authors.lastname: Marques
authors.forename: J B
authors.initials: JB
authors.lastname: Calixto
authors.forename: R A
authors.initials: RA
authors.lastname: Yunes
authors.forename: D O
authors.initials: DO
authors.lastname: Souza
mesh_terms: D000818:Animals; D002462:Cell Membrane / Q000378:metabolism; D002540:Cerebral Cortex / Q000378:metabolism*; D018698:Glutamic Acid / Q000378:metabolism*; D006165:Guanylyl Imidodiphosphate / Q000378:metabolism*; D010936:Plant Extracts / Q000494:pharmacology*; D010946:Plants, Medicinal / Q000737:chemistry*; D011485:Protein Binding; D051381:Rats; D017208:Rats, Wistar; D014316:Tritium
chemical_list: D010936:Plant Extracts; D014316:Tritium; D006165:Guanylyl Imidodiphosphate; D018698:Glutamic Acid