Mechanism of dacron-activated monocytic cell oxidation of low density lipoprotein.

Abstract:

PURPOSE:Oxidized lipids are believed to contribute to atherogenesis and may play a role in the development of anastomotic intimal hyperplasia in prosthetic vascular grafts. This study examines the hypothesis that clinically relevant graft material activates monocytes to oxidize low density lipoprotein (LDL). METHODS:LDL and Dacron or expanded polytetrafluoroethylene (ePTFE) graft material were incubated in the presence of U937 cells, a monocytic cell line. LDL oxidation was measured by conjugated dienes, lipid peroxides, thiobarbituric acid-reacting substances, and electrophoretic mobility. Cell production of superoxide was measured by ferricytochrome c reduction. Metal ion requirement was assessed with the metal chelators, ethylenediaminetetra-acidic acid, deferoxamine, and bathocuproinedisulfonic acid. To determine whether human monocytes were capable of being activated by Dacron graft material to oxidize LDL, freshly isolated peripheral blood monocytes were also studied. RESULTS:Incubation of LDL with U937 cells and Dacron increased LDL oxidation by 5- to 20-fold. LDL incubated with ePTFE or U937 cells alone resulted in minimal oxidation. Dacron graft increased U937 cell production of superoxide by 4-fold, whereas ePTFE had no effect. Superoxide dismutase inhibited Dacron-activated U937 cell oxidation of LDL by greater than 50%, which indicates a role for superoxide. Ethylenediaminetetra-acidic acid, deferoxamine, and bathocuproinedisulfonic acid each inhibited Dacron-activated U937 cell oxidation of LDL. Human peripheral blood monocytes were activated by Dacron graft material to oxidize LDL; superoxide dismutase inhibited Dacron-activated human monocytic oxidation of LDL, which suggests a role for superoxide. CONCLUSION:These results suggest that Dacron graft material activates monocytes to oxidize LDL by a mechanism that involves superoxide and requires iron and copper ions. Our work suggests a mechanism by which lipids that have been deposited within implanted vascular grafts may become oxidized. Oxidized lipids may contribute to the cellular dysfunction that results in anastomotic intimal hyperplasia and graft failure.

journal_name

J Vasc Surg

authors

van Aalst JA,Pitsch RJ,Absood A,Fox PL,Graham LM

doi

10.1016/s0741-5214(00)70079-6

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

171-80

issue

1 Pt 1

eissn

0741-5214

issn

1097-6809

pii

S0741521400137073

journal_volume

31

pub_type

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