Inhibition of MMP-9 attenuates hypertensive cerebrovascular dysfunction in Dahl salt-sensitive rats

被引:0
作者
Anuradha Kalani
Sathnur B. Pushpakumar
Jonathan C. Vacek
Suresh C. Tyagi
Neetu Tyagi
机构
[1] University of Louisville,Department of Physiology and Biophysics, School of Medicine
来源
Molecular and Cellular Biochemistry | 2016年 / 413卷
关键词
Cerebrovascular; Hypertension; MMP-9; ROS;
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学科分类号
摘要
Hypertensive cerebropathy is a pathological condition associated with cerebral edema and disruption of the blood–brain barrier. However, the molecular pathways leading to this condition remains obscure. We hypothesize that MMP-9 inhibition can help reducing blood pressure and endothelial disruption associated with hypertensive cerebropathy. Dahl salt-sensitive (Dahl/SS) and Lewis rats were fed with high-salt diet for 6 weeks and then treated without and with GM6001 (MMP inhibitor). Treatment of GM6001 (1.2 mg/kg body weight) was administered through intraperitoneal injections on alternate days for 4 weeks. GM6001 non-administered groups were given vehicle (0.9 % NaCl in water) treatment as control. Blood pressure was measured by tail-cuff method. The brain tissues were analyzed for oxidative/nitrosative stress, vascular MMP-9 expression, and tight junction proteins (TJPs). GM6001 treatment significantly reduced mean blood pressure in Dahl/SS rats which was significantly higher in vehicle-treated Dahl/SS rats. MMP-9 expression and activity was also considerably reduced in GM6001-treated Dahl/SS rats, which was otherwise notably increased in vehicle-treated Dahl/SS rats. Similarly MMP-9 expression in cerebral vessels of GM6001-treated Dahl/SS rats was also alleviated, as devised by immunohistochemistry analysis. Oxidative/nitrosative stress was significantly higher in vehicle-treated Dahl/SS rats as determined by biochemical estimations of malondialdehyde, nitrite, reactive oxygen species, and glutathione levels. RT-PCR and immunohistochemistry analysis further confirmed considerable alterations of TJPs in hypertensive rats. Interestingly, GM6001 treatment significantly ameliorated oxidative/nitrosative stress and TJPs, which suggest restoration of vascular integrity in Dahl/SS rats. These findings determined that pharmacological inhibition of MMP-9 in hypertensive Dahl-SS rats attenuate high blood pressure and hypertension-associated cerebrovascular pathology.
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页码:25 / 35
页数:10
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