Effects of 17 ß-estradiol on lipopolysacharride-induced intracellular adhesion molecule-1 mRNA expression and Ca²+ homeostasis alteration in human endothelial cells.
Vascul Pharmacol
; 53(5-6): 230-8, 2010.
Article
em En
| MEDLINE
| ID: mdl-20843480
ABSTRACT
Recent evidence showed that 17 ß-estradiol (E2) decreased cytokine-induced expression of cell adhesion molecules (CAM). Changes in intracellular Ca²+ concentration ([Ca²+](i)) has been shown to be associated with CAM expression in endothelial cells. Here, the effects of E2 (1 µM, 24 h) on the expression of intracellular adhesion molecule-1 (ICAM-1) and [Ca²+](i) were investigated in a lipopolysaccharide (LPS) (100 ng/mL, 18 h)-stimulated human endothelial cell line, EA.hy926, using real-time PCR and spectrofluorometry, respectively. PCR analysis revealed a significant increase in ICAM-1 expression in calcium ionophore A23187 (1 nM)- or LPS-stimulated cells. Pretreatment of cells with E(2) significantly inhibited LPS-induced ICAM-1 mRNA expression. [Ca²+](i) was monitored in Fura-2AM-loaded cells in the presence and absence of extracellular Ca²+ with thapsigargin (TG, 1 µM), a sarco/endoplasmic reticulum ATPase inhibitor or ATP (100 µM). The extent of TG- or ATP-induced [Ca²+](i) increase was significantly higher in LPS-stimulated cells than in control cells. Pre-treatment of LPS-stimulated cells with E2 limited the Ca²+ response to the same level as in control cells. Furthermore, ICI 182,780, an estrogen receptor antagonist, attenuated the inhibitory actions of E2 on ICAM-1 mRNA expression and Ca²+ responses, suggesting that estrogen receptors mediate, at least in part, the effects of estrogen. These data suggest a potential underlying mechanism for the protective effect of E2 against atherosclerosis.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
RNA Mensageiro
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Cálcio
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Molécula 1 de Adesão Intercelular
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Células Endoteliais
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Estradiol
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Estrogênios
Limite:
Humans
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article