Cited by 1,323Atherosclerosis and Cardiovascular DiseasesChemokine receptors and signalingCholesterol and Lipid Metabolism

Monocyte subsets differentially employ CCR2, CCR5, and CX3CR1 to accumulate within atherosclerotic plaques

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Tacke, Frank, Alvarez, David, Kaplan, Theodore J., Jakubzick, Claudia, Spanbroek, Rainer, Llodra, Jaime, Garin, Alexandre, Liu, Jianhua +5 more·2007·Journal of Clinical Investigation

Abstract

Monocytes participate critically in atherosclerosis. There are 2 major subsets expressing different chemokine receptor patterns: CCR2(+)CX3CR1(+)Ly-6C(hi) and CCR2(-)CX3CR1(++)Ly-6C(lo) monocytes. Both C-C motif chemokine receptor 2 (CCR2) and C-X(3)-C motif chemokine receptor 1 (CX3CR1) are linked to progression of atherosclerotic plaques. Here, we analyzed mouse monocyte subsets in apoE-deficient mice and traced their differentiation and chemokine receptor usage as they accumulated within atherosclerotic plaques. Blood monocyte counts were elevated in apoE(-/-) mice and skewed toward an increased frequency of CCR2(+)Ly-6C(hi) monocytes in apoE(-/-) mice fed a high-fat diet. CCR2(+)Ly-6C(hi) monocytes efficiently accumulated in plaques, whereas CCR2(-)Ly-6C(lo) monocytes entered less frequently but were more prone to developing into plaque cells expressing the dendritic cell-associated marker CD11c, indicating that phagocyte heterogeneity in plaques is linked to distinct types of entering monocytes. CCR2(-) monocytes did not rely on CX3CR1 to enter plaques. Instead, they were partially dependent upon CCR5, which they selectively upregulated in apoE(-/-) mice. By comparison, CCR2(+)Ly-6C(hi) monocytes unexpectedly required CX3CR1 in addition to CCR2 and CCR5 to accumulate within plaques. In many other inflammatory settings, these monocytes utilize CCR2, but not CX3CR1, for trafficking. Thus, antagonizing CX3CR1 may be effective therapeutically in ameliorating CCR2(+) monocyte recruitment to plaques without impairing their CCR2-dependent responses to inflammation overall.

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  • In atherosclerosis, circulating monocytes are recruited to fatty deposits in vascular intima/subintima via CCR2 and endothelial adhesion mechanisms.

    “Briefly, in atherosclerosis, circulating monocytes are recruited to sites of fatty deposit accumulation within the vascular intima and subintima via CCR2 and endothelial adhesion mediated mechanisms [49–52].”

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Research works printed but not linked: 4

  1. Teupser, D., et al. 2004. Major reduction of athero- sclerosis in fractalkine (CX3CL1)-deficient mice is at the brachiocephalic artery, not the aortic root. Proc. Natl. Acad. Sci. U. S. A. 101:17795-17800.
  2. Llodra, J., et al. 2004. Emigration of monocyte- derived cells from atherosclerotic lesions character- izes regressive, but not progressive, plaques. Proc. Natl. Acad. Sci. U. S. A. 101:11779-117784.
  3. Swirski, F.K., et al. 2006. Monocyte accumulation in mouse atherogenesis is progressive and proportion- al to extent of disease. Proc. Natl. Acad. Sci. U. S. A. 103:10340-10345.
  4. Kuziel, W.A., et al. 1997. Severe reduction in leuko- cyte adhesion and monocyte extravasation in mice deficient in CC chemokine receptor 2. Proc. Natl. Acad. Sci. U. S. A. 94:12053-12058.

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Authors
Tacke, F., Alvarez, D., Kaplan, T. J., Jakubzick, C., Spanbroek, R., Llodra, J., Garin, A., Liu, J., Mack, M., van Rooijen, N., Lira, S. A., Habenicht, A. J., & Randolph, G. J.
Affiliations
  • Icahn School of Medicine at Mount Sinai (US)
  • Friedrich Schiller University Jena (DE)
  • Erasmus MC Transplant Institute (NL)
  • University of Regensburg (DE)
Corresponding author
Randolph, Gwendalyn J.
Venue
Journal of Clinical Investigation
Published
2007-01-02
Volume
117
Issue
1
Pages
185-194
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2052554962
Cited by
1,323
References
8
Citations by year
2026: 21 · 2025: 30 · 2024: 64 · 2023: 70 · 2022: 56 · 2021: 61 · 2020: 62 · 2019: 64 · 2018: 79 · 2017: 75 · 2016: 88 · 2015: 90 · 2014: 75 · 2013: 91 · 2012: 96
FWCI
27.78
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • University of Regensburg Publication Server (University of Regensburg) (acceptedVersion)
  • RWTH Publications (RWTH Aachen) (submittedVersion)
Funders
  • Deutsche Forschungsgemeinschaft
  • National Institutes of Health (HL69446, AI49653)
  • Canadian Institutes of Health Research
  • National Heart, Lung, and Blood Institute (HL69446, R01HL069446)
  • National Institute of Allergy and Infectious Diseases (AI49653, R01AI049653)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK 067381, R01DK067381)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Atherosclerosis and Cardiovascular Diseases
  • Health Sciences › Medicine › Oncology › Chemokine receptors and signaling
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
Keywords
monocyte subsets, atherosclerosis, atherosclerotic plaque, CCR2, CCR5, CX3CR1, chemokine receptors, Ly6C, monocyte recruitment, ApoE-deficient mice, high-fat diet, CD11c, monocyte differentiation
MeSH terms
CX3C Chemokine Receptor 1, Animals, Monocytes, Receptors, Chemokine, Receptors, CCR5, Models, Animal, Atherosclerosis, Mice, Receptors, CCR2

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