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Provedor de dados:  BJMBR
País:  Brazil
Título:  Ginkgo biloba leaf extract (EGb 761) enhances catalepsy induced by haloperidol and L-nitroarginine in mice
Autores:  Fontana,L.
Souza,A.S.
Del Bel,E.A.
Oliveira,R.M.W. de
Data:  2005-11-01
Ano:  2005
Palavras-chave:  Nitric oxide
Ginkgo biloba
Catalepsy
Herbal medicine
Neuroleptic interaction
Extrapyramidal system
Resumo:  Ginkgo biloba extract EGb 761 has been reported to have therapeutic effects which have been attributed to anti-oxidant and free radical-scavenging activities, including a direct action on nitric oxide production. L G-nitro-arginine (L-NOARG), a nitric oxide synthase inhibitor, and haloperidol, a drug that blocks dopamine receptors, are both known to induce catalepsy in rodents. Nitric oxide has been shown to influence dopaminergic transmission in the striatum. The purpose of the present study was to evaluate the effect of the extract obtained from leaves of Ginkgo biloba tree EGb 761 on catalepsy induced by haloperidol or by L-NOARG. Albino Swiss mice (35-45 g, N = 8-12) received by gavage a single or repeated oral dose (twice a day for 4 days) of EGb 761 followed by ip injection of haloperidol or L-NOARG. After the treatments, the animals were submitted to behavioral evaluation using the catalepsy test. Acute treatment with 80 mg/kg EGb did not modify the catalepsy induced by L-NOARG but, the dose of 40 mg/kg significantly enhanced haloperidol-induced catalepsy measured at the 10th min of the test. After repeated treatment with 80 mg/kg EGb 761, a significant increase in the cataleptic effect produced by both haloperidol and L-NOARG was observed. These data show that repeated EGb 761 administration increases the effects of drugs that modify motor behavior in mice. Since the catalepsy test has predictive value regarding extrapyramidal effects, the possibility of pharmacological interactions between haloperidol and Ginkgo biloba extracts should be further investigated in clinical studies.
Tipo:  Info:eu-repo/semantics/other
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005001100012
Editor:  Associação Brasileira de Divulgação Científica
Relação:  10.1590/S0100-879X2005001100012
Formato:  text/html
Fonte:  Brazilian Journal of Medical and Biological Research v.38 n.11 2005
Direitos:  info:eu-repo/semantics/openAccess
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