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The Journal of Immunology, Vol 145, Issue 1 254-259, Copyright © 1990 by American Association of Immunologists
ARTICLES |
AK McNally, GM Chisolm 3d, DW Morel and MK Cathcart
Department of Immunology, Research Institute of the Cleveland Clinic Foundation, OH 44195.
Monocyte-mediated oxidation of low-density lipoprotein (LDL) converts the lipoprotein to a potent cytotoxin. The oxidation process requires monocyte activation and requires superoxide anion since it can be blocked by superoxide dismutase. In this study, the requirement for lipoxygenase activity is shown, in that 1) inhibitors of lipoxygenase prevent the alteration of LDL, 2) copper (II) (3,5-diisopropylsalicylic acid), an agent shown to enhance lipoxygenase activity in a cell-free system, similarly enhances monocyte-mediated LDL alteration, and 3) the (3,5-diisopropylsalicylic acid)-enhanced monocyte-mediated modification of LDL can be completely blocked by inhibitors of lipoxygenase or by superoxide dismutase. These data suggest an integral role for monocyte lipoxygenase in the generation by activated monocytes of the extracellular superoxide anion that participates in the oxidation of LDL and the conversion of LDL to a cytotoxin. Monocyte-modified LDL may be a mediator in tissue damage that accompanies atherosclerosis or occurs at sites of inflammation.
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