Prior research has suggested that GATA6+ pericardial macrophages may traffic to the myocardium to prevent interstitial fibrosis after myocardial infarction (MI), while subsequent literature claims that they do not. We demonstrate that GATA6+ pericardial macrophages are critical for preventing IL-33 induced pericarditis and attenuate trafficking of inflammatory monocytes and granulocytes to the pericardial cavity after MI. However, absence of GATA6+ macrophages did not affect myocardial inflammation due to MI or coxsackievirus-B3 induced myocarditis, or late-stage cardiac fibrosis and cardiac function post MI. GATA6+ macrophages are significantly less transcriptionally active following stimulation in vitro compared to bone marrow-derived macrophages and do not induce upregulation of inflammatory markers in fibroblasts. This suggests that GATA6+ pericardial macrophages attenuate inflammation through their interactions with surrounding cells. We therefore conclude that GATA6+ pericardial macrophages are critical in modulating pericardial inflammation, but do not play a significant role in controlling myocardial inflammation or fibrosis.

Department of Chemical and Biomolecular Engineering Johns Hopkins University Whiting School of Engineering Baltimore MD 21218 USA

Department of Pathology Johns Hopkins University School of Medicine Baltimore MD 21205 USA

Institute for Clinical and Experimental Medicine Prague Czech Republic

W Harry Feinstone Department of Molecular Microbiology and Immunology Johns Hopkins University Bloomberg School of Public Health Baltimore MD 21205 USA

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