title: Antinociceptive action of diphenyl diselenide in the nociception induced by neonatal administration of monosodium glutamate in rats.
abstract: Monosodium glutamate (MSG) is a neuroexcitatory amino acid commonly used as flavoring of foods. MSG neonatal administration to animals leads to behavioral and physiological disorders in adulthood, including increased pain sensitivity. This study aimed to investigate the effect of diphenyl diselenide (PhSe)2, an organoselenium compound with pharmacological properties already documented, on nociception induced by MSG. Newborn Wistar rats received 10 subcutaneous injections of MSG at a dose of 4.0g/kg or saline (once daily). At the 60th day of life, the rats were daily treated with (PhSe)2 (1mg/kg) or vehicle (canola oil) by the intragastric route for 7 days. The behavioral tests (locomotor activity, hot plate, tail-immersion and mechanical allodynia) were carried out. Ex vivo assays were performed in samples of hippocampus to determine Na(+), K(+)-ATPase and Ca(2+)-ATPase activities, cytokine levels and [(3)H]glutamate uptake. The results demonstrated that MSG increased nociception in the hot plate test and in the mechanical allodynia stimulated by Von-Frey hair but did not alter the tail immersion test. (PhSe)2 reversed all nociceptive behaviors altered by MSG. MSG caused an increase in Na(+),K(+)-ATPase and Ca(2+)-ATPase activities and in pro-inflammatory cytokine levels and a decrease in the anti-inflammatory cytokine and in the [(3)H]glutamate uptake. (PhSe)2 was effective in reversing all alterations caused by MSG. The results indicate that (PhSe)2 had a potential antinociceptive and anti-inflammatory action in the MSG model.
authors.affiliation: Laboratório de Síntese, Reatividade e Avaliação Farmacológica e Toxicológica de Organocalcogênios, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, CEP 97105-900 RS, Brazil.
authors.forename: Suzan G
authors.initials: SG
authors.lastname: Rosa
authors.affiliation: Laboratório de Síntese, Reatividade e Avaliação Farmacológica e Toxicológica de Organocalcogênios, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, CEP 97105-900 RS, Brazil.
authors.forename: Caroline B
authors.initials: CB
authors.lastname: Quines
authors.affiliation: Laboratório de Síntese, Reatividade e Avaliação Farmacológica e Toxicológica de Organocalcogênios, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, CEP 97105-900 RS, Brazil.
authors.forename: Juliana T
authors.initials: JT
authors.lastname: da Rocha
authors.affiliation: Laboratório de Síntese, Reatividade e Avaliação Farmacológica e Toxicológica de Organocalcogênios, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, CEP 97105-900 RS, Brazil.
authors.forename: Cristiani F
authors.initials: CF
authors.lastname: Bortolatto
authors.affiliation: Programa de Pós-graduação em Farmacologia, Universidade Federal de Santa Maria, Santa Maria, CEP 97105-900 RS, Brazil.
authors.forename: Thiago
authors.initials: T
authors.lastname: Duarte
authors.affiliation: Laboratório de Síntese, Reatividade e Avaliação Farmacológica e Toxicológica de Organocalcogênios, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, CEP 97105-900 RS, Brazil. Electronic address: criswn@ufsm.br.
authors.forename: Cristina W
authors.initials: CW
authors.lastname: Nogueira
mesh_terms: D000700:Analgesics / Q000494:pharmacology / Q000627:therapeutic use*; D000818:Animals; D000831:Animals, Newborn; D001555:Benzene Derivatives / Q000494:pharmacology / Q000627:therapeutic use*; D000252:Calcium-Transporting ATPases / Q000378:metabolism; D016207:Cytokines / Q000378:metabolism; D018698:Glutamic Acid / Q000378:metabolism; D006624:Hippocampus / Q000187:drug effects / Q000378:metabolism; D009043:Motor Activity / Q000187:drug effects; D016566:Organoselenium Compounds / Q000494:pharmacology / Q000627:therapeutic use*; D010146:Pain / Q000139:chemically induced / Q000188:drug therapy*; D010147:Pain Measurement / Q000187:drug effects*; D051381:Rats; D012970:Sodium Glutamate / Q000009:adverse effects / Q000037:antagonists & inhibitors*; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism
chemical_list: D000700:Analgesics; D001555:Benzene Derivatives; D016207:Cytokines; D016566:Organoselenium Compounds; C061132:diphenyldiselenide; D018698:Glutamic Acid; D000252:Calcium-Transporting ATPases; D000254:Sodium-Potassium-Exchanging ATPase; D012970:Sodium Glutamate
keywords: ATPases; Diphenyl diselenide; Excitotoxicity; Monosodium glutamate; Nociception; Selenium