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Department of Neurology, Medical Center of Central Massachusetts-Memorial, Worcester 01605-2982.
Consuming substantial quantities of n-3 fatty acids reduces atherogenesis in experimental models of atherosclerosis. The mechanisms of this beneficial effect remain uncertain. Monocyte-derived tissue macrophages are associated with atherogenesis, and inhibition of monocyte inflammatory activity could, hypothetically, be helpful in preventing atherosclerosis. We observed that stimulated human monocyte and/or macrophage production of superoxide and the occurrence of monocyte chemiluminescence, two indices of monocyte inflammatory activity, were significantly reduced by the ingestion of 6 g n-3 fatty acids/d for 6 wk. This effect was associated with a reduction of stearic and arachidonic acids whereas eicosapentaenoic and docosahexaenoic acid concentrations rose significantly. These results indicate that modest dietary n-3 fatty acid supplementation can reduce stimulated human-monocyte free-radical production and may impair the capability of macrophages derived from monocytes to promote oxidation of low-density-lipoprotein cholesterol and associated cellular toxicity.
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