Browsing by Author "Hou, Xuezhou"

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    Sca-1+ cardiac fibroblasts promote development of heart failure
    (Wiley, 2018-09) Chen, Guobao; Bracamonte-Baran, William; Diny, Nicola L.; Hou, Xuezhou; Talor, Monica V.; Fu, Kai; Liu, Yue; Davogustto, Giovanni; Vasquez, Hernan; Taegtmeyer, Heinrich; Frazier, O. Howard; Waisman, Ari; Conway, Simon J.; Wan, Fengyi; Čiháková, Daniela; Pediatrics, School of Medicine
    The causative effect of GM-CSF produced by cardiac fibroblasts to development of heart failure has not been shown. We identified the pathological GM-CSF-producing cardiac fibroblast subset and the specific deletion of IL-17A signaling to these cells attenuated cardiac inflammation and heart failure. We describe here the CD45−CD31−CD29+mEFSK4+PDGFRα+Sca-1+periostin+ (Sca-1+) cardiac fibroblast subset as the main GM-CSF producer in both experimental autoimmune myocarditis and myocardial infarction mouse models. Specific ablation of IL-17A signaling to Sca-1+periostin+ cardiac fibroblasts (PostnCreIl17rafl/fl) protected mice from post-infarct heart failure and death. Moreover, PostnCreIl17rafl/fl mice had significantly fewer GM-CSF-producing Sca-1+ cardiac fibrob-lasts and inflammatory Ly6Chi monocytes in the heart. Sca-1+ cardiac fibroblasts were not only potent GM-CSF producers, but also exhibited plasticity and switched their cytokine production profiles depending on local microenvironments. Moreover, we also found GMCSF-positive cardiac fibroblasts in cardiac biopsy samples from heart failure patients of myocarditis or ischemic origin. Thus, this is the first identification of a pathological GMCSF-producing cardiac fibroblast subset in human and mice hearts with myocarditis and ischemic cardiomyopathy. Sca-1+ cardiac fibroblasts direct the type of immune cells infiltrating the heart during cardiac inflammation and drive the development of heart failure.