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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1985 Sep;82(17):5949–5953. doi: 10.1073/pnas.82.17.5949

Endothelial cell-derived chemotactic activity for mouse peritoneal macrophages and the effects of modified forms of low density lipoprotein.

M T Quinn, S Parthasarathy, D Steinberg
PMCID: PMC390671  PMID: 3862109

Abstract

Cultured rabbit and bovine aortic endothelial cells generated chemotactic activity for mouse resident peritoneal macrophages, demonstrable in the conditioned medium. This chemotactic activity was heat stable and was not extracted into chloroform/methanol. It was inhibited by addition of endothelial cell-modified low density lipoprotein (EC-modified LDL), a form of LDL shown previously to contain peroxidized lipids, increased lysophosphatidylcholine, and partially degraded apoprotein B. The chemotactic activity was also inhibited by LDL previously oxidized in the absence of cells with 5 microM Cu2+. Inhibitory activity was present in the lipid extract of EC-modified LDL but not in that of native LDL, presumably representing peroxidized lipid components. EC-modified LDL also inhibited the chemotactic activity of zymosan-activated serum. Because EC-modified LDL is taken up in part by way of the acetyl-LDL receptor, the effects of acetyl-LDL were tested. Rather than inhibiting chemotaxis, acetyl LDL showed intrinsic positive chemotactic activity as did also fucoidin and polyinosinic acid, both of which also interact with the acetyl-LDL receptor. These studies suggest mechanisms by which macrophages may be recruited into the subendothelial space by endothelial cell-derived chemotactic factors or by natural polyanions structurally related to fucoidin or polyinosinic acid and then become "trapped" there because of the inhibitory effects of peroxidized lipid components in modified forms of LDL.

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Selected References

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