Cited by 1,011Cardiac electrophysiology and arrhythmiasConnexins and lens biologyCardiac Fibrosis and Remodeling

Macrophages Facilitate Electrical Conduction in the Heart

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Hulsmans, Maarten, Clauss, Sebastian, Xiao, Ling, Aguirre, Aaron D., King, Kevin R., Hanley, Alan, Hucker, William J., Wülfers, Eike M. +26 more·2017·Cell

Abstract

Organ-specific functions of tissue-resident macrophages in the steady-state heart are unknown. Here, we show that cardiac macrophages facilitate electrical conduction through the distal atrioventricular node, where conducting cells densely intersperse with elongated macrophages expressing connexin 43. When coupled to spontaneously beating cardiomyocytes via connexin-43-containing gap junctions, cardiac macrophages have a negative resting membrane potential and depolarize in synchrony with cardiomyocytes. Conversely, macrophages render the resting membrane potential of cardiomyocytes more positive and, according to computational modeling, accelerate their repolarization. Photostimulation of channelrhodopsin-2-expressing macrophages improves atrioventricular conduction, whereas conditional deletion of connexin 43 in macrophages and congenital lack of macrophages delay atrioventricular conduction. In the Cd11b DTR mouse, macrophage ablation induces progressive atrioventricular block. These observations implicate macrophages in normal and aberrant cardiac conduction.

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Crossref · 10.1016/j.cell.2017.03.050

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  • Under physiological conditions, crosstalk between cardiac macrophages and cardiomyocytes is vital for maintaining electrical stability and metabolic homeostasis through the efferocytosis of damaged mitochondria.

    “Under physiological conditions, this crosstalk is vital for maintaining electrical stability and metabolic homeostasis through the efferocytosis of damaged mitochondria [11,12].”

    From Cardiac Macrophages Exhibit Dynamic Heterogeneity and Functional Specialization During Experimental Autoimmune Myocarditis. (2026) · cites this paper as [11]

    The Results section (“Macrophages Electrically Modulate Myocytes”; page not provided) reports that cardiac macrophages couple electrically to cardiomyocytes and improve atrioventricular conduction. It does not support the claim that this crosstalk maintains metabolic homeostasis through efferocytosis of damaged mitochondria; searches for those terms found no relevant passage. (LLM, conf=0.88)

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  • Macrophages have been identified as key factors influencing cardiac remodelling and fibrosis.

    “Additionally, macrophages have been identified as key factors influencing cardiac remodelling and fibrosis [2,3].”

    From Elucidating cardiac fibroblasts heterogeneity and activation during experimental autoimmune myocarditis using spatial transcriptomics. (2025) · cites this paper as [2]

    The Introduction says macrophages are required for cardiac healing after injury, but does not connect them to remodelling or fibrosis. The Results address electrical conduction instead. Searches for cardiac remodelling and fibrosis found no passage in the paper making the attributed claim. (LLM, conf=0.72)

    Experimental — accuracy not yet measured

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Authors
Hulsmans, M., Clauss, S., Xiao, L., Aguirre, A. D., King, K. R., Hanley, A., Hucker, W. J., Wülfers, E. M., Seemann, G., Courties, G., Iwamoto, Y., Sun, Y., Savol, A. J., Sager, H. B., Lavine, K. J., Fishbein, G. A., Capen, D. E., Da Silva, N., Miquerol, L., Wakimoto, H., Seidman, C. E., Seidman, J. G., Sadreyev, R. I., Naxerova, K., Mitchell, R. N., Brown, D., Libby, P., Weissleder, R., Swirski, F. K., Kohl, P., Vinegoni, C., Milan, D. J., Ellinor, P. T., & Nahrendorf, M.
Affiliations
  • Harvard University (US)
  • University of Freiburg (DE)
  • Washington University in St. Louis (US)
  • Brigham and Women's Hospital (US)
  • Centre National de la Recherche Scientifique (FR)
  • Broad Institute (US)
Corresponding author
Nahrendorf, Matthias
Venue
Cell
Publisher
Elsevier BV
Published
2017-04
Volume
169
Issue
3
Pages
510-522.e20
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2605696370
Cited by
1,011
References
53
Citations by year
2026: 99 · 2025: 110 · 2024: 129 · 2023: 112 · 2022: 108 · 2021: 135 · 2020: 112 · 2019: 92 · 2018: 85 · 2017: 26 · 2016: 1
FWCI
66.57
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Arrow@dit (Dublin Institute of Technology) (submittedVersion)
  • HAL (submittedVersion)
  • ARAN (University of Galway Research Repository) (Ollscoil na Gaillimhe – University of Galway) (submittedVersion, cc-by-nc-nd)
  • eScholarship (California Digital Library) (submittedVersion)
  • mediaTUM – the media and publications repository of the Technical University Munich (Technical University Munich) (submittedVersion)
  • Spiral (Imperial College London) (submittedVersion, cc-by-nc-nd)
Funders
  • NIH (NS084863, HL128264, HL114477, HL117829, HL092577, HD069623, HL105780, HL096576)
  • Inflammatory Bowel Disease Grant (DK43351)
  • Boston Area Diabetes and Endocrinology Research Center (BADERC) Award (DK57521)
  • Fonds voor Wetenschappelijk Onderzoek-Vlaanderen
  • Marie Curie International Outgoing Fellowship
  • 7th European Community Framework Program (PIOF-GA-2012-328352)
  • German Center for Cardiovascular Research (DZHK
  • American Heart Association (14FTF20380185, 13EIA14220013)
  • Deutsche Forschungsgemeinschaft (SA1668/2-1)
  • European Research Council Advanced Grant CardioNect
  • Baden Wurttemberg Sonderlinie Medizin
  • Established Investigator Award
  • Fondation Leducq (14CVD01)
  • MGH Research Scholar Program
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Connexins and lens biology
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac Fibrosis and Remodeling
Keywords
cardiac macrophages, atrioventricular node, cardiac conduction, connexin 43, gap junctions, atrioventricular block, channelrhodopsin-2, macrophage depletion, resting membrane potential, repolarization
MeSH terms
Animals, Female, Heart Atria, Heart Conduction System, Humans, Macrophages, Male, Mice, Inbred C57BL, Middle Aged, Connexin 43, Myocytes, Cardiac, Mice

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