Cited by 509Phagocytosis and Immune RegulationAtherosclerosis and Cardiovascular DiseasesCholesterol and Lipid Metabolism

Phagocytosis of apoptotic cells by macrophages is impaired in atherosclerosis

Schrijvers, Dorien M., De Meyer, Guido R.Y., Kockx, Mark M., Herman, Arnold G., Martinet, Wim·2005·Arteriosclerosis Thrombosis and Vascular Biology

Abstract

OBJECTIVE: Apoptotic cell death has been demonstrated in advanced human atherosclerotic plaques. Apoptotic cells (ACs) should be rapidly removed by macrophages, otherwise secondary necrosis occurs, which in turn elicits inflammatory responses and plaque progression. Therefore, we investigated the efficiency of phagocytosis of ACs by macrophages in atherosclerosis. METHODS AND RESULTS: Human endarterectomy specimens and human tonsils were costained for CD68 (macrophages) and terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling (TUNEL) (apoptosis). Free and phagocytized ACs were counted in both tissues. The ratio of free versus phagocytized AC was 19-times higher in human atherosclerotic plaques as compared with human tonsils, indicating a severe defect in clearance of AC. Impaired phagocytosis of AC was also detected in plaques from cholesterol-fed rabbits and did not further change with plaque progression. In vitro experiments with J774 or peritoneal mouse macrophages showed that several factors caused impaired phagocytosis of AC including cytoplasmic overload of macrophages with indigestible material (beads), free radical attack, and competitive inhibition among oxidized red blood cells, oxidized low-density lipoprotein and ACs for the same receptor(s) on the macrophage. CONCLUSIONS: Our data demonstrate that phagocytosis of ACs is impaired in atherosclerotic plaques, which is at least partly attributed to oxidative stress and cytoplasmic saturation with indigestible material.

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  • Impaired macrophage efferocytosis enhances atherogenesis and atherosclerotic plaque instability.

    “The impaired ability of macrophage efferocytosis would enhance atherogenesis [139,140,141] and atherosclerotic plaque instability [142,143,144].”

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Research works printed but not linked: 3

  1. Hermann M, Niemitz C, Marafioti T, Schriever F. Reduced phagocytosis of apoptotic cells in malignant lymphoma. Int J Cancer. 1998;75: 675-679.
  2. Manfredi AA, Rovere P, Galati G, Heltai S, Bozzolo E, Soldini L, Davoust J, Balestrieri G, Tincani A, Sabbadini MG. Apoptotic cell clearance in systemic lupus erythematosus. I. Opsonization by antiphos- pholipid antibodies. Arthritis Rheum. 1998;41:205-214.
  3. Kockx MM, Knaapen MW. The role of apoptosis in vascular disease. J Pathol. 2000;190:267-280.

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Authors
Schrijvers, D. M., De Meyer, G. R. Y., Kockx, M. M., Herman, A. G., & Martinet, W.
Affiliations
  • University of Antwerp (BE)
  • From the Division of Pharmacology (D.M.S., G.R.Y.D.M., M.M.K., A.G.H., W.M.), University of Antwerp, Wilrijk, Belgium; and the Department of Pathology (M.M.K.), AZ Middelheim, Antwerp, Belgium
Venue
Arteriosclerosis Thrombosis and Vascular Biology
Published
2005-06
Volume
25
Issue
6
Pages
1256-1261
ISSN
  • 1079-5642 (ISSN-L)
  • 1524-4636
OpenAlex
W2163327518
Cited by
509
References
42
Citations by year
2026: 13 · 2025: 32 · 2024: 34 · 2023: 31 · 2022: 34 · 2021: 33 · 2020: 21 · 2019: 24 · 2018: 29 · 2017: 32 · 2016: 20 · 2015: 25 · 2014: 21 · 2013: 24 · 2012: 16
FWCI
6.74
Type
journal article
Language
en
Open access
closed
Locations
  • Arteriosclerosis Thrombosis and Vascular Biology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
  • Life Sciences › Immunology and Microbiology › Immunology › Atherosclerosis and Cardiovascular Diseases
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
Keywords
phagocytosis of apoptotic cells, macrophages, atherosclerosis, atherosclerotic plaque, secondary necrosis, oxidative stress, oxidized LDL, plaque progression, cholesterol-fed rabbits, tonsil
MeSH terms
Aged, Animals, Carotid Artery Diseases, Cytoplasm, Erythrocytes, Female, Humans, Lipoproteins, LDL, Male, Necrosis, Phagocytosis, Rabbits, Palatine Tonsil, Apoptosis, Macrophages, Peritoneal, Oxidative Stress, U937 Cells, Mice

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