Cited by 1,494Cardiac Fibrosis and RemodelingAtherosclerosis and Cardiovascular DiseasesImmune cells in cancer

Embryonic and Adult-Derived Resident Cardiac Macrophages Are Maintained through Distinct Mechanisms at Steady State and during Inflammation

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Epelman, Slava, Lavine, Kory J., Beaudin, Anna E., Sojka, Dorothy K., Carrero, Javier A., Calderon, Boris, Brija, Thaddeus, Gautier, Emmanuel L. +12 more·2014·Immunity

Abstract

Cardiac macrophages are crucial for tissue repair after cardiac injury but are not well characterized. Here we identify four populations of cardiac macrophages. At steady state, resident macrophages were primarily maintained through local proliferation. However, after macrophage depletion or during cardiac inflammation, Ly6c(hi) monocytes contributed to all four macrophage populations, whereas resident macrophages also expanded numerically through proliferation. Genetic fate mapping revealed that yolk-sac and fetal monocyte progenitors gave rise to the majority of cardiac macrophages, and the heart was among a minority of organs in which substantial numbers of yolk-sac macrophages persisted in adulthood. CCR2 expression and dependence distinguished cardiac macrophages of adult monocyte versus embryonic origin. Transcriptional and functional data revealed that monocyte-derived macrophages coordinate cardiac inflammation, while playing redundant but lesser roles in antigen sampling and efferocytosis. These data highlight the presence of multiple cardiac macrophage subsets, with different functions, origins, and strategies to regulate compartment size.

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Crossref · 10.1016/j.immuni.2013.11.019

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  • During experimental autoimmune myocarditis (EAM), a significant increase in pro-inflammatory Ly6Chi monocytes and recruited CCR2+ macrophages is observed throughout the cardiac tissue.

    “During the course of experimental autoimmune myocarditis (EAM), a significant increase in the number of pro-inflammatory Ly6Chi monocytes and recruited CCR2+ macrophages is observed throughout the cardiac tissue [7,8,10].”

    From Cardiac Macrophages Exhibit Dynamic Heterogeneity and Functional Specialization During Experimental Autoimmune Myocarditis. (2026) · cites this paper as [7]

    The Results sections on cardiac macrophage expansion report Ly6chi monocyte influx and expansion of macrophage populations during angiotensin II infusion, including recruitment contributing to CCR2+ macrophages. They do not report these changes during experimental autoimmune myocarditis or establish that the increase occurs throughout cardiac tissue; searches for EAM and myocarditis found no such passage. Page numbers were not available in our copy. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Myeloid clusters 1 and 5 highly expressed Ccr2, a marker of monocyte-derived macrophages that enter from the circulation.

    “Clusters 1 and 5 had high expression of Ccr2, a marker of monocyte-derived macrophages that infiltrate from the circulation17-19 (Fig. 1J and Extended Data Fig. 1C-E).”
  • Macrophages constitute a highly heterogeneous cell population and are key mediators in both maintaining homeostasis and the pathogenesis of myocardial injury.

    “Macrophages, which constitute a highly heterogeneous cell population, are key mediators in both maintaining homeostasis and the pathogenesis of myocardial injury [7,8].”
  • In the heart, two main lineages of macrophages with distinct origins and functions are distinguished: tissue-resident macrophages (TRMs; typically CCR2-), predominantly derived from embryonic development, and recruited monocyte-derived macrophages (CCR2+), which infiltrate from the bloodstream in response to injury.

    “In the heart, two main lineages of macrophages with distinct origins and functions are distinguished: tissue-resident macrophages (TRMs; typically CCR2-), predominantly derived from embryonic development, and recruited monocyte-derived macrophages (CCR2+), which infiltrate from the bloodstream in response to injury [7,8,9,10].”
  • Species-specific differences in macrophage ontogeny, cytokine networks, and the composition of the cardiac immune niche may limit direct extrapolation of findings.

    “Species-specific differences in macrophage ontogeny, cytokine networks, and the composition of the cardiac immune niche may limit direct extrapolation of findings [7].”

    From Cardiac Macrophages Exhibit Dynamic Heterogeneity and Functional Specialization During Experimental Autoimmune Myocarditis. (2026) · cites this paper as [7]

    The Results describe cardiac macrophage origins and inflammatory functions in mice, and the Experimental Procedures identify the animals studied as mice (page unavailable). Our copy does not compare species or discuss whether differences in ontogeny, cytokine networks, or the cardiac immune niche limit extrapolation; searches for human–mouse differences and extrapolation found no such passage. (LLM, conf=0.76)

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Authors
Epelman, S., Lavine, K. J., Beaudin, A. E., Sojka, D. K., Carrero, J. A., Calderon, B., Brija, T., Gautier, E. L., Ivanov, S., Satpathy, A. T., Schilling, J. D., Schwendener, R., Sergin, I., Razani, B., Forsberg, E. C., Yokoyama, W. M., Unanue, E. R., Colonna, M., Randolph, G. J., & Mann, D. L.
Affiliations
  • Washington University in St. Louis (US)
  • University of California, Santa Cruz (US)
  • University of Zurich (CH)
  • Howard Hughes Medical Institute (US)
Corresponding author
Mann, Douglas L.
Venue
Immunity
Publisher
Elsevier BV
Published
2014-01
Volume
40
Issue
1
Pages
91-104
ISSN
1074-7613 (ISSN-L)
OpenAlex
W2010484682
Cited by
1,494
References
34
Citations by year
2026: 101 · 2025: 113 · 2024: 131 · 2023: 135 · 2022: 140 · 2021: 147 · 2020: 147 · 2019: 117 · 2018: 128 · 2017: 117 · 2016: 80 · 2015: 77 · 2014: 59
FWCI
76.28
Type
journal article
Language
en
Open access
Locations
  • Immunity (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (acceptedVersion)
  • HAL (submittedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (submittedVersion)
Funders
  • American Heart Association
  • National Heart, Lung, and Blood Institute (K08HL112826, R01HL111094, T32HL007081)
  • National Cancer Institute (T32CA009547)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK100917)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac Fibrosis and Remodeling
  • Life Sciences › Immunology and Microbiology › Immunology › Atherosclerosis and Cardiovascular Diseases
  • Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
Keywords
cardiac macrophages, tissue-resident macrophages, monocyte-derived macrophages, embryonic macrophages, yolk sac macrophages, monocyte proliferation, Ly6C+ monocytes, CCR2, cardiac inflammation, efferocytosis, antigen sampling, macrophage homeostasis
MeSH terms
Animals, Antigens, Ly, Cell Differentiation, Cells, Cultured, Heart, Homeostasis, Macrophages, Mice, Inbred C57BL, Mice, Transgenic, Monocytes, Myocarditis, Myocardium, Phagocytosis, Yolk Sac, Cell Death, Antigen Presentation, Cell Lineage, Myocytes, Cardiac, Fetal Development, Mice, Receptors, CCR2, Transcriptome

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