Doxycycline at subantimicrobial doses inhibits matrix metalloproteinases (MMPs) activity, and is the only MMP inhibitor which is widely available in clinical practice. The aim of the study was to reveal whether non-specific MMPs inhibition by tetracycline could ameliorate development of atherosclerosis in apolipoprotein E (apoE)-knockout mice. Doxycycline (1.5 mg/ kg b.w./day) administered orally attenuated atherogenesis, measured both by "en face" method (10.25±1.7% vs. 15.7±2.0%, p<0.05) and "cross-section" method (66,254±7,468 µm2 vs. 90,687±8,521 µm2, p<0.05). In-situ zymography showed decrease of the extent of non-specific gelatinase activity in doxycycline-treated mice This is the first report to date describing the effect of doxycycline on atherogenesis in apoE-targeted mice.
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