Abstract
Adiponectin (APN) is an immunomodulatory adipocytokine that improves outcome in patients with virus-negative inflammatory cardiomyopathy and mice with autoimmune myocarditis. Here, we investigated whether APN modulates cardiac inflammation and injury in coxsackievirus B3 (CVB3) myocarditis. Myocarditis was induced by CVB3 infection of APN-KO and WT mice. APN reconstitution was performed by adenoviral gene transfer. Expression analyses were performed by qRT-PCR and immunoblot. Cardiac histology was analyzed by H&E-stain and immunohistochemistry. APN-KO mice exhibited diminished subacute myocarditis with reduced viral load, attenuated inflammatory infiltrates determined by NKp46, F4/80 and CD3/CD4/CD8 expression and reduced IFNβ, IFNγ, TNFα, IL-1β and IL-12 levels. Moreover, myocardial injury assessed by necrotic lesions and troponin I release was attenuated resulting in preserved left ventricular function. Those changes were reversed by APN reconstitution. APN had no influence on adhesion, uptake or replication of CVB3 in cardiac myocytes. In acute CVB3 myocarditis, cardiac viral load did not differ between APN-KO and WT mice. However, APN-KO mice displayed an enhanced acute immune response, i.e. increased expression of myocardial CD14, IFNβ, IFNγ, IL-12, and TNFα resulting in increased cardiac infiltration with pro-inflammatory M1 macrophages and activated NK cells. Up-regulation of cardiac CD14 expression, type I and II IFNs and inflammatory cell accumulation in APN-KO mice was inhibited by APN reconstitution. Our observations indicate that APN promotes CVB3 myocarditis by suppression of toll-like receptor-dependent innate immune responses, polarization of anti-inflammatory M2 macrophages and reduction of number and activation of NK cells resulting in attenuated acute anti-viral immune responses.
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Acknowledgments
This work was supported by a Grant of Deutsche Forschungsgemeinschaft (SFB TR19, TP B7 to CS and CS as well as TP Z4 to KK).
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Jenke, A., Holzhauser, L., Löbel, M. et al. Adiponectin promotes coxsackievirus B3 myocarditis by suppression of acute anti-viral immune responses. Basic Res Cardiol 109, 408 (2014). https://doi.org/10.1007/s00395-014-0408-y
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DOI: https://doi.org/10.1007/s00395-014-0408-y