全反式维甲酸对脑出血大鼠血肿周围脑组织基质金属蛋白酶-9表达的影响

目的 探讨全反式维甲酸(all-trans retinoic acid,ATRA)对脑出血大鼠血肿周围组织基质金属蛋白酶-9(matrixmetalloproteinase-9,MMP-9)表达的影响.方法 40只SD大鼠随机分为ATRA组和生理盐水对照组,每组分别设24 h、48 h、72 h和7 d等4个亚组,每个亚组5只.在立体定位仪引导下将自体血注入尾状核制备脑出血模型,模型制作成功后分别腹腔注射ATRA(1 mg/d)和等体积生理盐水.采用免疫组化染色法检测不同时间点脑组织MMP-9的表达情况.结果 脑出血后24 hATRA组和生理盐水对照组血肿周围微血管内皮细胞MMP-9表达均显著上调,48～72 h达高峰.在各个时间点,ATRA组MMP-9表达均显著低于生理盐水对照组(P均＜0.05).结论 ATRA能抑制脑出血大鼠血肿周围组织MMP-9表达,从而有可能减轻脑水肿.

Effect of all-trans retinoic acid on the expression of matrix metalloproteinases-9 in perihematomal brain tissue after intracerebral hemorrhage in rats

Objective To investigate the effect of all-trans retinoic acid (ATRA) on the expression of matrix metalloproteinases-9 (MMP-9) in perihematomal brain tissue after intracerebral hemorrhage in rats.Methods Forty Sprague-Dawley rats were randomly allocated into ATRA and normal saline control groups.Each group was redivided into 2 h,48 h,72 h,and 7 d subgroups (n = 5 in each subgroup).The autologous blood was injected into the rat caudate nucleus for establishing a model of intracerebral hemorrhage under the guidance of stereotaxic apparatus.Intraperitoneal ATRA (1 mg/d) and the same volume of saline were injected respectively after the success of modeling.The expression of MMP-9 at different time points was detected by using immunohistochemical staining.Results The expression of MMP-9 in microvascular endothelial cells in perihematomal brain tissue in rats was upregulated 24 h after intracerebral hemorrhage in the ATRA and normal saline control groups,and it reached the peak at 48 to 72 h.The expression of MMP-9 in the ATRA group at different time points was lower than that in the normal saline control group (all P＜0.05).Conclusions ATRA inhibits the expression of MMP-9 in perihematomal brain tissue after intracerebral hemorrhage in rats,and thus may reduce the brain edema.