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The effects of dietary soy isoflavones (IF) and conjugated equine estrogens (CEE) on circulating inflammatory markers were determined at the end of a 3-yr study of ovariectomized monkeys consuming a moderately atherogenic diet. Treatments were: 1) control, receiving alcohol-extracted soy-protein-based diet with low IF content (comparable to approximately 5 mg/d); 2) CEE, added to the control diet at a dose comparable to 0.625 mg/d; and 3) IF, consumed as a part of unextracted soy protein isolate at a dose comparable to 129 mg/d. Serum soluble vascular cell adhesion molecule-1 (sVCAM-1) was reduced by both IF (P &lt; 0.006) and CEE (P &lt; 0.0001) relative to controls. Serum monocyte chemoattractant protein (MCP)-1 was reduced by CEE (P &lt; 0.0001) but not by IF (P = 1.00). Treatments did not affect serum IL-6 (P = 0.40), soluble E-selectin (P = 0.17), or C-reactive protein (P = 0.15). Serum MCP-1 and, to a lesser extent, IL-6 significantly correlated with atherosclerosis (plaque area) in the iliac and carotid arteries (all P &lt; 0.05). Serum MCP-1 was also strongly associated with coronary artery atherosclerosis and with indices of plaque inflammation and matrix remodeling (matrix metalloproteinase-9) in the coronary artery intima (all P &lt; 0.01). We conclude that, in this well-established nonhuman primate model of atherosclerosis, this dose of soy IF provided an antiinflammatory effect specific for sVCAM-1, whereas the effects of CEE extended to both sVCAM-1 and MCP1. It is possible that the atheroprotective effects of IF and CEE are mediated, at least in part, by effects on VCAM-1. The sites of IF inhibitory effects on sVCAM-1 production are not known, but likely candidates include the liver and/or the cardiovascular system.

Effects of Soy Isoflavones and Conjugated Equine Estrogens on Inflammatory Markers in Atherosclerotic, Ovariectomized Monkeys