Rapid and long-term effects of 17 beta-estradiol on PIP2-phospholipase C-specific activity of MCF-7 cells.
Cell Signal
; 5(2): 181-6, 1993 Mar.
Article
em En
| MEDLINE
| ID: mdl-8388702
ABSTRACT
Activity of the enzyme phosphatidylinositol 4,5-bisphosphate phospholipase C (PIP2-PLC) was demonstrated in MCF-7 human breast cancer cell homogenate. The addition of 10(-9) M 17 beta-estradiol to the culture medium elicited in the cells two types of responses depending on the period of exposure. Enzyme activity was rapidly activated at 15 s of incubation. After 5 min, PIP2-PLC activity was inhibited, and this effect continued at least until 24 h of exposure to the hormone. When 17 beta-estradiol was added in vitro to the total homogenate of untreated cells, enzyme activity was stimulated in a dose-dependent manner. These findings indicate that 17 beta-estradiol induces early and long-term modifications of the phosphoinositide signal pathway in intact MCF-7 cells as well as in vitro. The rapidity of the early effect suggests a non-genomic action of estradiol.
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Base de dados:
MEDLINE
Assunto principal:
Transdução de Sinais
/
Diester Fosfórico Hidrolases
/
Estradiol
Limite:
Humans
Idioma:
En
Ano de publicação:
1993
Tipo de documento:
Article