期刊
CELL REPORTS
卷 28, 期 1, 页码 172-+出版社
CELL PRESS
DOI: 10.1016/j.celrep.2019.06.007
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资金
- NIH/NHLBI [R01HL118183, R01HL136586]
- American Heart Association (AHA) AWRP Winter [17GRNT33700274]
- AHA 2019 Transformational Project Award [19TPA34910007]
- Johns Hopkins Autoimmune Disease Research Center O'Leary-Wilson Fellowship
- Johns Hopkins Bloomberg School of Public Health Richard J. and Margaret Conn Himelfarb Student Support fund
- Myocarditis Foundation Postdoctoral Fellowship [90072351]
- AHA Postdoctoral Fellowship [16POST31330012, 16PRE31170040, 15PRE25400010]
- AARDA
- Deutsche Forschungsgemeinschaft [KL595/2-3]
- Matthew Poyner MVP Memorial Myocarditis Research Fund
- Katherine E. Welsh Fellowship
- Gilead Research Scholar grant
Two types of monocytes, Ly6C(hi) and Ly6C(lo), infiltrate the heart in murine experimental autoimmune myocarditis (EAM). We discovered a role for cardiac fibroblasts in facilitating monocyte-to-macrophage differentiation of both Ly6C(hi) and Ly6C(lo)cells, allowing these macrophages to perform divergent functions in myocarditis progression. During the acute phase of EAM, IL-17A is highly abundant. It signals through cardiac fibroblasts to attenuate efferocytosis of Ly6C(hi) monocyte-derived macrophages (MDMs) and simultaneously prevents Ly6C(lo) monocyte-to-macrophage differentiation. We demonstrated an inverse clinical correlation between heart IL-17A levels and efferocytic receptor expressions in humans with heart failure (HF). In the absence of IL-17A signaling, Ly6C(hi) MDMs act as robust phagocytes and are less pro-inflammatory, whereas Ly6C(lo) monocytes resume their differentiation into MHCII+ macrophages. We propose that MHCII + Ly6C(lo) MDMs are associated with the reduction of cardiac fibrosis and prevention of the myocarditis sequalae.
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