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Monocytes and Neutrophils Oxidize Low Density Lipoprotein Making It Cytotoxic

Monocytes and Neutrophils Oxidize Low Density Lipoprotein Making It Cytotoxic Free radicals are believed to be involved in leukocyte induced tissue injury. The present studies were performed to determine whether low density lipoprotein (LDL) might serve as a mediator of tissue injury after leukocyte induced free radical oxidation of LDL. Our results show that incubation of LDL with monocytes or polymorphonuclear leukocytes (PMN) leads to oxidation of the lipoprotein rendering it toxic to proliferating fibroblasts. Monocyte activation enhances these effects. Butylated hydroxytoluene (BHT), vitamin E (vit E) and glutathione (GSH) virtually prevent the oxidation of LDL and the formation of cytotoxic LDL, indicating that these alterations are mediated by leukocyte-derived free radicals. This is the first demonstration that short-lived free radicals emanating from phagocytic cells could mediate cell injury through the action of a stable cytotoxin formed by the oxidation of LDL. The fact that lipoproteins can transfer a cytotoxic effect from leukocytes to proliferating cells reveals a pathway for cell destruction which may have implications in atherosclerotic plaque progression, macrophage mediated toxicity to tumor cells and tissue injury by inflammatory processes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Leukocyte Biology Oxford University Press

Monocytes and Neutrophils Oxidize Low Density Lipoprotein Making It Cytotoxic

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References (38)

Copyright
© 1985 Society for Leukocyte Biology
eISSN
1938-3673
DOI
10.1002/jlb.38.2.341
Publisher site
See Article on Publisher Site

Abstract

Free radicals are believed to be involved in leukocyte induced tissue injury. The present studies were performed to determine whether low density lipoprotein (LDL) might serve as a mediator of tissue injury after leukocyte induced free radical oxidation of LDL. Our results show that incubation of LDL with monocytes or polymorphonuclear leukocytes (PMN) leads to oxidation of the lipoprotein rendering it toxic to proliferating fibroblasts. Monocyte activation enhances these effects. Butylated hydroxytoluene (BHT), vitamin E (vit E) and glutathione (GSH) virtually prevent the oxidation of LDL and the formation of cytotoxic LDL, indicating that these alterations are mediated by leukocyte-derived free radicals. This is the first demonstration that short-lived free radicals emanating from phagocytic cells could mediate cell injury through the action of a stable cytotoxin formed by the oxidation of LDL. The fact that lipoproteins can transfer a cytotoxic effect from leukocytes to proliferating cells reveals a pathway for cell destruction which may have implications in atherosclerotic plaque progression, macrophage mediated toxicity to tumor cells and tissue injury by inflammatory processes.

Journal

Journal of Leukocyte BiologyOxford University Press

Published: Aug 1, 1985

Keywords: monocyte; neutrophil; low density lipoprotein; cytotoxicity; lipoprotein oxidation

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