Resident and recruited macrophages differentially contribute to cardiac healing after myocardial ischemia

Tobias Weinberger, Messerer Denise, Markus Joppich, Maximilian Fischer, Clarisabel Garcia Rodriguez, Konda Kumaraswami, Vanessa Wimmler, Sonja Ablinger, Saskia Räuber, Jiahui Fang, Lulu Liu, Wing Han Liu, Julia Winterhalter, Johannes Lichti, Lukas Thomas, Dena Esfandyari, Guelce Percin, Sandra Matin, Andrés Hidalgo, Claudia WaskowStefan Engelhardt, Andrei Todica, Ralf Zimmer, Clare Pridans, Elisa Gomez Perdiguero, Christian Schulz

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Cardiac macrophages are heterogenous in phenotype and functions, which has been associated with differences in their ontogeny. Despite extensive research, our understanding of the precise role of different subsets of macrophages in ischemia/reperfusion (I/R) injury remains incomplete. We here investigated macrophage lineages and ablated tissue macrophages in homeostasis and after I/R injury in a CSF1R-dependent manner. Genomic deletion of a fms-intronic regulatory element (FIRE) in the Csf1r locus resulted in specific absence of resident homeostatic and antigen-presenting macrophages, without affecting the recruitment of monocyte-derived macrophages to the infarcted heart. Specific absence of homeostatic, monocyte-independent macrophages altered the immune cell crosstalk in response to injury and induced proinflammatory neutrophil polarization, resulting in impaired cardiac remodeling without influencing infarct size. In contrast, continuous CSF1R inhibition led to depletion of both resident and recruited macrophage populations. This augmented adverse remodeling after I/R and led to an increased infarct size and deterioration of cardiac function. In summary, resident macrophages orchestrate inflammatory responses improving cardiac remodeling, while recruited macrophages determine infarct size after I/R injury. These findings attribute distinct beneficial effects to different macrophage populations in the context of myocardial infarction.

Original languageEnglish
JournaleLIFE
Volume12
DOIs
Publication statusPublished - 22 May 2024

Keywords / Materials (for Non-textual outputs)

  • Animals
  • Macrophages/immunology
  • Mice
  • Receptors, Granulocyte-Macrophage Colony-Stimulating Factor/metabolism
  • Myocardial Ischemia/immunology
  • Myocardial Infarction/pathology
  • Male
  • Myocardial Reperfusion Injury/immunology
  • Mice, Inbred C57BL
  • Myocardium/pathology
  • Disease Models, Animal

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