Hypericum androsaemum infusion increases tert-butyl hydroperoxide-induced mice hepatotoxicity in vivo

• Tipo: Artigo em Revista Científica Internacional
• Data: 2004

Autores

Valentao, P (Autor) FFUP; Carvalho, M (Autor) Outra; Carvalho, F (Autor) FFUP; Fernandes, E (Autor) FFUP; das Neves, RP (Autor) Outra; Pereira, ML (Autor) Outra; Andrade, PB (Autor) FFUP; Seabra, RM (Autor) Outra; Bastos, ML (Autor) FFUP

Revista

Título: Journal of Ethnopharmacology

Vol. 94

Páginas: 345-351

ISSN: 0378-8741

Editora: Elsevier

Indexação

ISI Web of Knowledge - 14 Citações

Scopus - 18 Citações

Classificação Científica

FOS: Ciências médicas e da saúde > Medicina básica

Outras Informações

ID Authenticus: P-000-8AX

DOI: 10.1016/j.jep.2004.06.012

Abstract (EN): Increasing evidence regarding free radical generating agents indicates that the sustained production of high levels of reactive oxygen species (ROS) can cause hepatotoxicity. Being a short chain analog of lipid peroxide, tert-butyl hydroperoxide (t-BHP) is metabolized into free radical intermediates by cytochrome P450 in hepatocytes, which initiate lipid peroxidation, glutathione depletion and cell damage. The aim of the present study was to evaluate the putative protective effect of Hypericum androsaemum lyophilised infusion against t-BHP-induced mice hepatotoxicity in vivo, which has already been shown to be antioxidant in vitro. However, the results showed that the oral pretreatment with Hypericum androsaemum infusion (4, 20 and 100 mg/kg) for 4 days before a single intraperitoneal dose of t-BHP (1.8 mmol/kg) potentiated the t-BHP-induced hepatotoxicity. In fact, it was observed a potentiation in the depletion of total glutathione and reduced glutathione (GSH) contents and increase in oxidised glutathione (GSSG) level. Also the histopathological evaluation of the mice livers revealed that the infusion raised the incidence of liver lesions induced by t-BHP. These data do not corroborate any effect of Hypericum androsaemum infusion as hepatoprotector, but rather as a potentiator of hepatotoxicity in the present experimental conditions.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7