Objective-We investigated the effects of statin compared with the American Heart Association (AHA) Step I Diet on lipoproteins, vasomotor function, tumor necrosis factor (TNF)-␣, and serological markers of plaque stability. Furthermore, we investigated the mechanism of regulation suggested by experimental studies. Methods and Results-For 14 weeks, we administered AHA dietϩplacebo and AHA dietϩsimvastatin (20 mg daily) to 31 and 32 randomly selected patients with coronary artery disease, respectively. Compared with diet alone, simvastatin significantly improved the percent flow-mediated dilator response to hyperemia from 3.37Ϯ2.28% to 5.89Ϯ2.35% (PϽ0.001) and lowered plasma levels of C-reactive protein from 0.48 to 0.10 mg/dL (PϽ0.001), TNF-␣ from 3.38 to 2.79 pg/mL (PϽ0.001), total matrix metalloproteinase (MMP)-9 from 36 to 28 ng/mL (Pϭ0.006), and tissue inhibitor of matrix metalloproteinase-1 from 80Ϯ30 to 74Ϯ23 ng/mL (Pϭ0.041), and simvastatin lowered to a greater extent MMP-9 activity (from 71 to 52 ng/mL, Pϭ0.006) and MMP-9 activity/tissue inhibitor of matrix metalloproteinase-1 ratios (Pϭ0.018), although this difference did not reach statistical significance. There were significant correlations between the degree of changes in TNF-␣ and the degree of changes in MMP-9 activity (rϭ0.424, Pϭ0.016). However, no significant correlations between lipoprotein levels or flow-mediated dilation percentages and levels of plaque stability markers were determined (Ϫ0.208ՅrՅ0.243).
Conclusions-Simvastatin