Cited by 367Atherosclerosis and Cardiovascular DiseasesCholesterol and Lipid MetabolismCerebrovascular and Carotid Artery Diseases

Monocyte accumulation in mouse atherogenesis is progressive and proportional to extent of disease

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Swirski, Filip K., Pittet, Mikael J., Kircher, Moritz F., Aikawa, Elena, Jaffer, Farouc A., Libby, Peter, Weissleder, Ralph·2006·Proceedings of the National Academy of Sciences

Abstract

Monocytes participate importantly in the pathogenesis of atherosclerosis, but their spatial and temporal recruitment from circulation remains uncertain. This study tests the hypothesis that monocyte accumulation in atheroma correlates with the extent of disease by using a sensitive and simple quantitative assay that allows tracking of highly enriched populations of blood monocytes. A two-step isolation method yielded viable and functionally intact highly enriched peripheral blood monocyte populations (>90%). Recipient mice received syngeneic monocytes labeled in two ways: by transgenically expressing EGFP or with a radioactive tracer [ 111 In]oxine. After 5 days, more labeled cells accumulated in the aorta, principally the aortic root and ascending aorta, of 10-wk-old ApoE −/− compared with 10-wk-old C57BL/6 mice (223 ± 3 vs. 87 ± 22 cells per aorta). Considerably more monocytes accumulated in 20-wk-old ApoE −/− mice on either chow (314 ± 41 cells) or high-cholesterol diet (395 ± 53 cells). Fifty-week-old ApoE −/− mice accumulated even more monocytes in the aortic root, ascending aorta, and thoracic aorta after both chow (503 ± 67 cells) or high-cholesterol diet (648 ± 81 cells). Labeled monocyte content in the aorta consistently correlated with lesion surface area. These data indicate that monocytes accumulate continuously during atheroma formation, accumulation increases in proportion to lesion size, and recruitment is augmented with hypercholesterolemia. These results provide insights into mechanisms of atherogenesis and have implications for the duration of therapies directed at leukocyte recruitment.

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Crossref · 10.1073/pnas.0604260103

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  • Lesional macrophages mainly come from circulating monocytes that enter atherosclerosis-prone arterial wall sites and growing plaques.

    “Macrophages in atherosclerotic lesions mainly originate from circulating monocytes, which migrate into atherosclerosis-susceptible sites of the arterial wall and into the growing atherosclerotic lesions139,140.”

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Authors
Swirski, F. K., Pittet, M. J., Kircher, M. F., Aikawa, E., Jaffer, F. A., Libby, P., & Weissleder, R.
Affiliations
  • *Center for Molecular Imaging Research and Donald W. Reynolds Cardiovascular Clinical Research Center on Atherosclerosis at Harvard Medical School, Massachusetts General Hospital and Harvard Medical School, CNY 149, Charlestown, MA 02129; and
  • Harvard University (US)
  • Brigham and Women's Hospital (US)
Venue
Proceedings of the National Academy of Sciences
Published
2006-07-05
Volume
103
Issue
27
Pages
10340-10345
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1992958840
Cited by
367
References
37
Citations by year
2026: 5 · 2025: 9 · 2024: 10 · 2023: 16 · 2022: 6 · 2021: 25 · 2020: 18 · 2019: 23 · 2018: 19 · 2017: 17 · 2016: 22 · 2015: 20 · 2014: 29 · 2013: 21 · 2012: 29
FWCI
6.31
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
Funders
  • American Heart Association
  • Massachusetts General Hospital
  • National Heart, Lung, and Blood Institute (U01HL080731)
  • National Cancer Institute (R24-CA-92782, R24CA092782)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Atherosclerosis and Cardiovascular Diseases
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Cerebrovascular and Carotid Artery Diseases
Keywords
monocyte accumulation, atherogenesis, atherosclerosis, monocyte recruitment, ApoE-deficient mice, high-cholesterol diet, hypercholesterolemia, EGFP transgenic mice, indium-111 oxine, aortic root, leukocyte recruitment, disease progression
MeSH terms
Animals, Apolipoproteins E, Cell Movement, Cell Separation, Cholesterol, Monocytes, Signal Transduction, Mice, Knockout, Disease Progression, Atherosclerosis, Mice

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