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Correspondence to:
Raffaele De Caterina.
Dietary long-chain fatty acids (FA) may influence pathological processes involving endothelial activation, including inflammation and atherosclerosis. We have previously shown that the n–3 FA docosahexaenoate (DHA) inhibits endothelial activation in the range of nutritionally achievable plasma concentrations. The present study assessed structural determinants for this effect. Saturated, monounsaturated, and n–6 and n–3 polyunsaturated FA were incubated with cultured endothelial cells for 24–72 h alone, and then in the presence of interleukin-1, tumor necrosis factor, or bacterial lipopolysaccharide for an additional 24 h before assessing the expression of the vascular cell adhesion molecule-1 (VCAM-1) or other products of endothelial activation. No FA tested per se elicited endothelial activation. While saturated FA did not inhibit cytokine-induced expression of adhesion molecules, a progressively increasing inhibitory activity was observed, for the same chain length, with an increase in double bonds. Comparison of FA with the same length and number of unsaturation and only differing for the double bond position or for the cis/trans configuration indicated no difference in inhibitory potency, indicating no effect of the double bond position or configuration. As judged by Northern analysis, these latter FA also inhibited VCAM-1 messenger RNA steady state levels to the same extent, indicating a pre-translational site of action attributable to the single double bond. Thus the double bond is the minimum necessary and sufficient requirement for FA inhibition of endothelial activation. These properties are likely relevant to the anti-atherogenic and anti-inflammatory properties ascribed to n–3 FA, which are able to accommodate the highest number of double bonds in a fatty acid of given chain length.—De Caterina, R., W. Bernini, M. A. Carluccio, J. K. Liao, and P. Libby. Structural requirements for inhibition of cytokine-induced endothelial activation by unsaturated fatty acids. J. Lipid Res. 1998. 39: 1062–1070.
Supplementary key words:
leukocyte adhesion molecules, VCAM-1, E-selectin, cytokines, n–3 fatty acids, omega–3 fatty acids, double bonds, atherosclerosis, inflammation
Copyright © 1998 by Lipid Research, Inc.
Original Article
Structural requirements for inhibition of cytokine-induced endothelial activation by unsaturated fatty acids
Raffaele De Caterinaa,
Walter Berninia,
Maria Annunziata Carlucciob,
James K. Liaoc, and
Peter Libbyc
a C.N.R. Institute of Clinical Physiology, Pisa, Italy
b C.N.R. Institute of Clinical Physiology, Lecce, Italy
c Women's Hospital, Boston, MA 02115
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