Abstract
TIR-domain-containing adaptor-inducing interferon-β (TRIF) plays a major role in Toll-like receptor 3 (TLR3) mediated signaling. Mice deficient in TLR3 and TRIF have been shown to be highly susceptible to enterovirus-induced myocardial injury. These mice have decreased production of antiviral cytokines and increased viral replication in the heart. Therefore, we hypothesized that conditional overexpression of TRIF would change cardiac myocyte susceptibility to virus infection by augmenting the antiviral response. We generated double-transgenic MHC-tTA/MHCtetO-TRIF mice (DT), with conditional cardiac-specific overexpression of TRIF. Naive DT mice had increased cardiac expression of antiviral cytokines and increased cellular infiltration but no alterations in cardiac function. DT mice were less susceptible to encephalomyocarditis virus (EMCV) infection and had a significantly lower viral load in the heart when compared to littermate (LM) and MHCtetO-TRIF (ST) mice. Histopathological examination showed that the severity of myocarditis was also attenuated in DT mice. Furthermore, the decreased virus titers in the DT mouse hearts led to less cardiac damage and better cardiac function when compared to LM and ST mice. Administration of doxycycline to DT mice suppressed the protective effects of TRIF overexpression in the heart. The findings of the present study establish the importance of cardiac-specific TRIF-mediated signaling in the heart in acute viral myocarditis and identify potentially important targets for diagnostic and therapeutic strategies.
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Abbreviations
- ST:
-
Single trangenic MHC-tetO-TRIF mice
- DT:
-
Double-transgenic MHC-tTA/MHCtetO-TRIF mice
- cTnI:
-
Cardiac troponin I
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Acknowledgments
This research was supported by grants HL083426 and HL091223 from the National Institutes of Health. We thank, Douglas L. Mann, MD for his critical review of the manuscript.
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An erratum to this article can be found at http://dx.doi.org/10.1007/s00395-011-0234-4
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Xu, Z., Desai, M., Philip, J. et al. Conditional transgenic expression of TIR-domain-containing adaptor-inducing interferon-β (TRIF) in the adult mouse heart is protective in acute viral myocarditis. Basic Res Cardiol 106, 1159–1171 (2011). https://doi.org/10.1007/s00395-011-0226-4
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DOI: https://doi.org/10.1007/s00395-011-0226-4