Selective suppression of glutathione S-transferase activities in rat primary hepatocytes by growth hormone.
Pharmacology
; 51(1): 13-23, 1995 Jun.
Article
en En
| MEDLINE
| ID: mdl-7568340
Glutathione S-transferases (GSTs) detoxify diverse electrophilic chemicals, including anticancer drugs. Containing at least 100 microM total GST, the adult rat liver has abundant alpha and mu class GST isoenzymes. We utilized primary cultured rat hepatocytes, maintained in chemically defined medium, to examine direct regulation of GST activities by human growth hormone (hGH). Maintenance of GST activities in this primary cultured hepatocyte system for 8 days allowed subsequent study of GST regulation by hGH. Protein concentration, cell number, DNA content, and viability did not significantly differ (p > 0.05) between the untreated and hGH (2 micrograms/ml)-treated hepatocytes. However, hGH treatment decreased mu GST activity (p < 0.05), whereas alpha GST activity was unaltered. As positive controls for our culture system and to corroborate our findings, we examined phenobarbital induction of GST activities and hGH regulation of certain cytochrome P450-dependent testosterone hydroxylases.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Hormona del Crecimiento
/
Inhibidores Enzimáticos
/
Glutatión Transferasa
/
Hígado
Límite:
Animals
/
Humans
/
Male
Idioma:
En
Revista:
Pharmacology
Año:
1995
Tipo del documento:
Article
País de afiliación:
Estados Unidos
Pais de publicación:
Suiza