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J Mol Cell Cardiol. 2017 Oct;111:102-113. doi: 10.1016/j.yjmcc.2017.08.008. Epub 2017 Aug 16.

Spontaneous activation of a MAVS-dependent antiviral signaling pathway determines high basal interferon-β expression in cardiac myocytes.

Author information

1
Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA; Comparative Medicine Institute, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA.
2
Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA; Comparative Medicine Institute, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA. Electronic address: barbara_sherry@ncsu.edu.

Abstract

Viral myocarditis is a leading cause of sudden death in young adults as the limited turnover of cardiac myocytes renders the heart particularly vulnerable to viral damage. Viruses induce an antiviral type I interferon (IFN-α/β) response in essentially all cell types, providing an immediate innate protection. Cardiac myocytes express high basal levels of IFN-β to help pre-arm them against viral infections, however the mechanism underlying this expression remains unclear. Using primary cultures of murine cardiac and skeletal muscle cells, we demonstrate here that the mitochondrial antiviral signaling (MAVS) pathway is spontaneously activated in unstimulated cardiac myocytes but not cardiac fibroblasts or skeletal muscle cells. Results suggest that MAVS association with the mitochondrial-associated ER membranes (MAM) is a determinant of high basal IFN-β expression, and demonstrate that MAVS is essential for spontaneous high basal expression of IFN-β in cardiac myocytes and the heart. Together, results provide the first mechanism for spontaneous high expression of the antiviral cytokine IFN-β in a poorly replenished and essential cell type.

KEYWORDS:

Cardiac myocyte; Cardiomyocyte; Interferon; MAM; MAVS; Mitochondria

PMID:
28822807
PMCID:
PMC5600710
DOI:
10.1016/j.yjmcc.2017.08.008
[Indexed for MEDLINE]
Free PMC Article

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