Cited by 883Cardiac Fibrosis and RemodelingAtherosclerosis and Cardiovascular DiseasesMesenchymal stem cell research

Self-Renewing Resident Cardiac Macrophages Limit Adverse Remodeling Following Myocardial Infarction

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Dick, Sarah A., Macklin, Jillian A., Nejat, Sara, Momen, Abdul, Clemente-Casares, Xavier, Althagafi, Marwan G., Chen, Jinmiao, Kantores, Crystal +13 more·2019·Nature Immunology

Abstract

Macrophages promote both injury and repair after myocardial infarction, but discriminating functions within mixed populations remains challenging. Here we used fate mapping, parabiosis and single-cell transcriptomics to demonstrate that at steady state, TIMD4+LYVE1+MHC-II lo CCR2- resident cardiac macrophages self-renew with negligible blood monocyte input. Monocytes partially replaced resident TIMD4-LYVE1-MHC-II hi CCR2- macrophages and fully replaced TIMD4-LYVE1-MHC-II hi CCR2+ macrophages, revealing a hierarchy of monocyte contribution to functionally distinct macrophage subsets. Ischemic injury reduced TIMD4+ and TIMD4- resident macrophage abundance, whereas CCR2+ monocyte-derived macrophages adopted multiple cell fates within infarcted tissue, including those nearly indistinguishable from resident macrophages. Recruited macrophages did not express TIMD4, highlighting the ability of TIMD4 to track a subset of resident macrophages in the absence of fate mapping. Despite this similarity, inducible depletion of resident macrophages using a Cx3cr1-based system led to impaired cardiac function and promoted adverse remodeling primarily within the peri-infarct zone, revealing a nonredundant, cardioprotective role of resident cardiac macrophages.

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Crossref · 10.1038/s41590-018-0272-2

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  • Resident macrophage markers Lyve1, Folr2 and Timd4 were enriched in myeloid clusters 4 and 6, with Lyve1 and Folr2 also marking clusters 0, 2 and 3.

    “Expression of the resident macrophage markers15,16 Lyve1, Folr2 and Timd4 were enriched in clusters 4 and 6, with Lyve1 and Folr2 also marking clusters 0, 2 and 3 (Fig. 1J and Extended Data Fig. 1C-E).”

    From Chromatin remodelling drives immune cell–fibroblast communication in heart failure (2024) · cites this paper as [15]

    The Discussion identifies TIMD4 and LYVE1 as resident cardiac macrophage markers. The Results section on recruited cardiac macrophage plasticity lists Folr2 among genes associated with mature macrophages, but does not specifically establish it as a resident marker. The cluster-enrichment pattern is presented as the citing paper’s own figure result, not as a finding attributed to this source. (LLM, conf=0.83)

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  • Resident macrophage loss is immediately followed by a massive influx of pro-inflammatory, monocyte-derived macrophages (CCR2+) recruited from the circulation.

    “Their localized loss is immediately followed by a massive influx of pro-inflammatory, monocyte-derived macrophages (CCR2+) recruited from the circulation [8,9,10].”

    From Cardiac Macrophages Exhibit Dynamic Heterogeneity and Functional Specialization During Experimental Autoimmune Myocarditis. (2026) · cites this paper as [9]

    The Results section on resident macrophage loss reports a roughly 60% decline in resident macrophages by day 2 after infarction and a predominance of recruited macrophages afterward. The Abstract identifies CCR2 as a marker of recruited macrophages, but the paper does not establish that influx immediately follows resident-cell loss. Its Results also describe recruited macrophages with both inflammatory and reparative pathways, so calling the influx uniformly pro-inflammatory overstates the finding. Page numbers are unavailable in our copy. (LLM, conf=0.86)

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  • In a healthy heart, tissue-resident macrophages (TRMs) including subsets expressing Timd4, Lyve1, and Folr2 (TLF+) constitute approximately 70% of the cardiac immune compartment and maintain tissue homeostasis.

    “In a healthy heart, tissue-resident macrophages (TRMs) (including subsets expressing Timd4, Lyve1, and Folr2, collectively termed TLF+) constitute the vast majority (approximately 70%) of the cardiac immune compartment and are responsible for maintaining tissue homeostasis [9].”

    From Cardiac Macrophages Exhibit Dynamic Heterogeneity and Functional Specialization During Experimental Autoimmune Myocarditis. (2026) · cites this paper as [9]

    The Results (Single cell analyses reveal unique cardiac macrophage subsets; page unavailable) identify homeostatic pathways in the Timd4 cluster, and the Results (Recruited cardiac macrophage plasticity within infarcted tissue; page unavailable) list Timd4, Lyve1 and Folr2 among resident-macrophage genes. The copy does not establish that resident macrophages make up approximately 70% of the healthy heart’s immune compartment or demonstrate that they maintain homeostasis. Its 70% figure instead describes macrophage loss in the infarct zone after injury. (LLM, conf=0.87)

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  • Tissue-resident macrophages (TRMs, CCR2−, TLF+) were rapidly depleted during the early inflammatory phase of EAM, accompanied by a pronounced influx of CCR2+ monocyte-derived macrophages that dominated the immune landscape at peak inflammation.

    “Consistent with earlier reports [8,9], we observed a rapid depletion of tissue-resident macrophages (TRMs, CCR2−, TLF+) during the early inflammatory phase of EAM. This loss was accompanied by a pronounced influx of CCR2+ monocyte-derived macrophages, which dominated the immune landscape at peak inflammation.”

    From Cardiac Macrophages Exhibit Dynamic Heterogeneity and Functional Specialization During Experimental Autoimmune Myocarditis. (2026) · cites this paper as [9]

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  • Myocarditis is not only a transient inflammatory condition but a highly orchestrated process involving temporally regulated immune-stromal interactions that critically determine disease outcome.

    “Our findings support and extend previous observations that myocarditis is not only a transient inflammatory condition but a highly orchestrated process involving temporally regulated immune–stromal interactions that critically determine the outcome of the disease [9,30].”

    From Cardiac Macrophages Exhibit Dynamic Heterogeneity and Functional Specialization During Experimental Autoimmune Myocarditis. (2026) · cites this paper as [9]

    The Abstract and Discussion (pages not provided) show that cardiac macrophage populations change after myocardial infarction and that resident macrophages affect healing and cardiac function. They do not establish the claimed temporally regulated immune–stromal interactions in myocarditis, which is a different condition; the only exact mention of myocarditis found is in a reference title. (LLM, conf=0.86)

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Authors
Dick, S. A., Macklin, J. A., Nejat, S., Momen, A., Clemente-Casares, X., Althagafi, M. G., Chen, J., Kantores, C., Hosseinzadeh, S., Aronoff, L., Wong, A., Zaman, R., Barbu, I., Besla, R., Lavine, K. J., Razani, B., Ginhoux, F., Husain, M., Cybulsky, M. I., Robbins, C. S., & Epelman, S.
Affiliations
  • University Health Network (CA)
  • Agency for Science, Technology and Research (SG)
  • Washington University in St. Louis (US)
Corresponding author
Epelman, Slava
Venue
Nature Immunology
Published
2018-12-11
Volume
20
Issue
1
Pages
29-39
ISSN
  • 1529-2908 (ISSN-L)
  • 1529-2916
OpenAlex
W2902050841
Cited by
883
References
55
Citations by year
2026: 126 · 2025: 123 · 2024: 140 · 2023: 125 · 2022: 103 · 2021: 110 · 2020: 98 · 2019: 57
FWCI
50.88
Type
journal article
Language
en
Open access
Locations
  • Nature Immunology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Heart, Lung, and Blood Institute (K08HL112826, R01HL138466, R01HL139714, K08HL123519, R01HL125838)
  • National Institute of Allergy and Infectious Diseases (R21AI148877)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac Fibrosis and Remodeling
  • Life Sciences › Immunology and Microbiology › Immunology › Atherosclerosis and Cardiovascular Diseases
  • Health Sciences › Medicine › Genetics › Mesenchymal stem cell research
Keywords
myocardial infarction, cardiac remodeling, monocyte-derived macrophages, TIMD4, LYVE-1, CCR2, macrophage self-renewal, monocyte recruitment, CX3CR1, peri-infarct zone, cardioprotection, fate mapping, single-cell transcriptomics
MeSH terms
Cell Self Renewal, CX3C Chemokine Receptor 1, Animals, Histocompatibility Antigens Class II, Cell Differentiation, Macrophages, Membrane Proteins, Mice, Transgenic, Myocardial Infarction, Myocardium, Parabiosis, Cell Lineage, Ventricular Remodeling, Gene Expression Profiling, Membrane Transport Proteins, Vesicular Transport Proteins, Mice, Receptors, CCR2, Single-Cell Analysis

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