Stimulation with a monoclonal antibody (mAb4E4) of scavenger receptor-mediated uptake of chemically modified low density lipoproteins by THP-1-derived macrophages enhances foam cell generation
| Autor: | Hilde Bernar, Maryvonne Rosseneu, Desire Collen, Paul Holvoet, Els Brouwers, Berlinda Vanloo, G. Perez |
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| Rok vydání: | 1994 |
| Předmět: |
Carotid Artery Diseases
Apolipoprotein B 1 2-Dipalmitoylphosphatidylcholine Arteriosclerosis Receptor expression Fc receptor Endocytosis Cell Line Mice Structure-Activity Relationship Animals Humans Scavenger receptor Receptors Immunologic Receptor Foam cell Receptors Lipoprotein Receptors Scavenger Endarterectomy Carotid Mice Inbred BALB C biology Apolipoprotein A-I Macrophages Antibodies Monoclonal Membrane Proteins Biological Transport General Medicine Scavenger Receptors Class B Molecular biology Lipoproteins LDL Kinetics Biochemistry LDL receptor biology.protein lipids (amino acids peptides and proteins) Cholesterol Esters Foam Cells Protein Binding Research Article |
| Zdroj: | The Journal of clinical investigation. 93(1) |
| ISSN: | 0021-9738 |
| Popis: | mAb4E4, a murine monoclonal antibody that is specific for acetylated LDL and malondialdehyde-treated LDL, binds specifically to modified LDL present in human atherosclerotic lesions. It is directed against an epitope that is poorly exposed in delipidated and solubilized apolipoprotein B-100 from modified LDL. mAb4E4, as well as its F(ab')2 and Fab fragments, enhanced the uptake of both acetylated LDL and malondialdehyde-treated LDL by THP-1-derived macrophages resulting in a sixfold increase of cytoplasmic cholesteryl ester levels. The increased uptake of modified LDL/mAb4E4 complexes did not occur via the Fc receptor and did not depend on aggregation of modified LDL particles. However, their uptake was inhibited by blocking the scavenger receptors with fucoidin or by downregulation of receptor expression with endotoxins or interferon-gamma, indicating that their uptake is mediated via these receptors. Thus, generation of autoimmune antibodies against modified LDL and subsequent endocytosis of soluble modified LDL/antibody complexes via scavenger receptors may enhance foam cell generation. This mechanism may contribute to the progression of atherosclerotic lesions. |
| Databáze: | OpenAIRE |
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