Effect of compound EXP-2528 on angiotensin Ⅱ-induced E-selectin and VCAM-1 expression in rat brain microvascular endothelial cells in vitro
- Author:
- No author available
- Journal Title:
- ACTA PHARMACEUTICA SINICA
- Issue:
- 8
- DOI:
- 10.3321/j.issn:0513-4870.2007.08.004
- Key Word:
- 脑;内皮细胞;血管紧张素II;拮抗剂;E-选择素;血管细胞粘附分子-1;brain;endothelial cell;angiotensin II;antagonist;E-selectin;vascular cell adhesion molecule-1
Abstract： The aim of this study is to investigate the effect and mechanism of angiotensin (Ang) II on E-selectin and vascular cell adhesion molecule-1 (VCAM-1) expression in rat brain microvascular endothelial cells (BMEC) and evaluate the effect of compound EXP-2528, a novel Ang Ⅱ type 1 (AT1) receptor antagonist. The experiment was performed in cultured BMEC of rat. The mRNA and protein expression of E-selectin and VCAM-1 in BMEC was analyzed by RT-PCR and Western blotting, respectively. The results showed that the mRNA and protein expression of E-selectin and VCAM-1 in BMEC were significantly upregulated by 4 h or 18 h exposure to 1×10-7 mol·L-1 Ang Ⅱ. These effects were abolished by pretreatment with the selective AT1 receptor antagonists losartan and compound EXP-2528, but not with the AT2 selective antagonist PD123319. Combining losartan with PD123319 also significantly inhibited Ang Ⅱ-induced E-selectin and VCAM-1 expression in BMEC, but there was no significant difference compared with losartan group. These findings indicated that Ang Ⅱ upregulated E-selectin and VCAM-1 in BMEC by activating AT1 receptor and then involved in the development of cerebrovascular disease.
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