Differential binding with ERá and ERâ of the phytoestrogen-rich plant Pueraria mirifica
Braz. j. med. biol. res
; 43(2): 195-200, Feb. 2010. graf
Artigo
em Inglês
| LILACS
| ID: lil-538230
Biblioteca responsável:
BR1.1
ABSTRACT
Variations in the estrogenic activity of the phytoestrogen-rich plant, Pueraria mirifica, were determined with yeast estrogen screen (YES) consisting of human estrogen receptors (hER) hERá and hERâ and human transcriptional intermediary factor 2 (hTIF2) or human steroid receptor coactivator 1 (hSRC1), respectively, together with the â-galactosidase expression cassette. Relative estrogenic potency was expressed by determining the â-galactosidase activity (EC50) of the tuber extracts in relation to 17â-estradiol. Twenty-four and 22 of the plant tuber ethanolic extracts interacted with hERá and hERâ, respectively, with a higher relative estrogenic potency with hERâ than with hERá. Antiestrogenic activity of the plant extracts was also determined by incubation of plant extracts with 17â-estradiol prior to YES assay. The plant extracts tested exhibited antiestrogenic activity. Both the estrogenic and the antiestrogenic activity of the tuber extracts were metabolically activated with the rat liver S9-fraction prior to the assay indicating the positive influence of liver enzymes. Correlation analysis between estrogenic potency and the five major isoflavonoid contents within the previously HPLC-analyzed tuberous samples namely puerarin, daidzin, genistin, daidzein, and genistein revealed a negative result.
Texto completo:
Disponível
Coleções:
Bases de dados internacionais
Base de dados:
LILACS
Assunto principal:
Extratos Vegetais
/
Pueraria
/
Receptor alfa de Estrogênio
/
Receptor beta de Estrogênio
/
Fígado
Limite:
Animais
Idioma:
Inglês
Revista:
Braz. j. med. biol. res
Assunto da revista:
Biologia
/
Medicina
Ano de publicação:
2010
Tipo de documento:
Artigo
País de afiliação:
Tailândia
Instituição/País de afiliação:
Chulalongkorn University/TH
/
Mahidol University/TH