Abstract:
BACKGROUND AND AIMS:Increased activity of matrix metalloproteinase (MMP)-2 is observed in aortas of different models of hypertension, and its activation is directly mediated by oxidative stress. As quercetin is an important flavonoid with significant antioxidant effects, the hypothesis here is that quercetin will reduce increased MMP-2 activity by decreasing oxidative stress in aortas of hypertensive rats and then ameliorate hypertension-induced vascular remodeling. METHODS:Male two-kidney one-clip (2K1C) hypertensive Wistar rats and controls were treated with quercetin (10 mg/kg/day) or its vehicle for three weeks by gavage. Rats were then analyzed at five weeks of hypertension. Systolic blood pressure (SBP) was determined by tail-cuff plethysmography. Aortas were used to determine MMP activity by in situ zymography and reactive oxygen species (ROS) levels by dihydroethidium. Western blot was performed to detect focal adhesion kinase (FAK) and phosphorylated-FAK levels. RESULTS:SBP was increased in 2K1C rats and only a borderline reduction in SBP was observed after treating 2K1C rats with quercetin. Cross-sectional area and the number of vascular smooth muscle cells were significantly increased in aortas of hypertensive rats, and quercetin reduced them. Quercetin reduced ROS levels in aortas of 2K1C rats and the increased activity of gelatinases in situ. However, quercetin did not affect the levels of tissue inhibitor of MMP (TIMP)-2 and did not interfere with FAK and p-FAK levels in aortas of hypertensive rats. Furthermore, different concentrations of quercetin did not directly reduce the activity of human recombinant MMP-2 in vitro. CONCLUSIONS:Quercetin reduces hypertension-induced vascular remodeling, oxidative stress and MMP-2 activity in aortas.
journal_name
Atherosclerosisjournal_title
Atherosclerosisauthors
Pereira SC,Parente JM,Belo VA,Mendes AS,Gonzaga NA,do Vale GT,Ceron CS,Tanus-Santos JE,Tirapelli CR,Castro MMdoi
10.1016/j.atherosclerosis.2018.01.031subject
Has Abstractpub_date
2018-03-01 00:00:00pages
146-153eissn
0021-9150issn
1879-1484pii
S0021-9150(18)30031-5journal_volume
270pub_type
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