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Research Article Free access | 10.1172/JCI119417

Vitamin C blocks inflammatory platelet-activating factor mimetics created by cigarette smoking.

H A Lehr, A S Weyrich, R K Saetzler, A Jurek, K E Arfors, G A Zimmerman, S M Prescott, and T M McIntyre

Institute for Pathology, Johannes Gutenberg University, Mainz, Germany.

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Institute for Pathology, Johannes Gutenberg University, Mainz, Germany.

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Institute for Pathology, Johannes Gutenberg University, Mainz, Germany.

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Institute for Pathology, Johannes Gutenberg University, Mainz, Germany.

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Institute for Pathology, Johannes Gutenberg University, Mainz, Germany.

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Institute for Pathology, Johannes Gutenberg University, Mainz, Germany.

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Institute for Pathology, Johannes Gutenberg University, Mainz, Germany.

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Institute for Pathology, Johannes Gutenberg University, Mainz, Germany.

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Published May 15, 1997 - More info

Published in Volume 99, Issue 10 on May 15, 1997
J Clin Invest. 1997;99(10):2358–2364. https://doi.org/10.1172/JCI119417.
© 1997 The American Society for Clinical Investigation
Published May 15, 1997 - Version history
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Abstract

Cigarette smoking within minutes induces leukocyte adhesion to the vascular wall and formation of intravascular leukocyte-platelet aggregates. We find this is inhibited by platelet-activating factor (PAF) receptor antagonists, and correlates with the accumulation of PAF-like mediators in the blood of cigarette smoke-exposed hamsters. These mediators were PAF-like lipids, formed by nonenzymatic oxidative modification of existing phospholipids, that were distinct from biosynthetic PAF. These PAF-like lipids induced isolated human monocytes and platelets to aggregate, which greatly increased their secretion of IL-8 and macrophage inflammatory protein-1alpha. Both events were blocked by a PAF receptor antagonist. Similarly, blocking the PAF receptor in vivo blocked smoke-induced leukocyte aggregation and pavementing along the vascular wall. Dietary supplementation with the antioxidant vitamin C prevented the accumulation of PAF-like lipids, and it prevented cigarette smoke-induced leukocyte adhesion to the vascular wall and formation of leukocyte-platelet aggregates. This is the first in vivo demonstration of inflammatory phospholipid oxidation products and it suggests a molecular mechanism coupling cigarette smoke with rapid inflammatory changes. Inhibition of PAF-like lipid formation and their intravascular sequela by vitamin C suggests a simple dietary means to reduce smoking-related cardiovascular disease.

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