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Coxsackievirus B3 (CVB3) induces cardiac inflammation (myocarditis) in male but not female C57BL/6 mice. Protection of females correlates with reduced expression of TNF-alpha and IL-1beta at both the mRNA and protein levels in the heart. Treatment of females with 300 ng/mouse of recombinant TNF-alpha on days +1 and +3 relative to infection restores myocarditis susceptibility to levels approximating those of infected male mice, showing that TNF-alpha deficiency is central to disease resistance. Female mice express little CD1d on spleen lymphocytes or cardiac myocytes, while females treated with TNF-alpha show increased CD1d expression in both cell populations. TNF-alpha treatment of male or female CD1d knockout (CD1dKO) mice failed to restore myocarditis susceptibility, demonstrating that of the multiple potential TNF-alpha activities, its ability to upregulate this non-classical major histocompatibility complex antigen is its dominant function in myocarditis susceptibility. Bone marrow chimeric mice were produced between female C57BL/6 and C57BL/6 CD1dKO mice so that either hematopoietic or non-hematopoietic cells were CD1d deficient. TNF-alpha treatment of chimeric mice having wild-type (CD1d+) hematopoietic cells restored myocarditis susceptibility, while TNF-alpha treatment of chimeric mice having CD1dKO hematopoietic cells, but CD1d+ myocytes, failed to develop myocarditis, showing that CD1d expression in lymphoid cells controls disease susceptibility.

Tumor Necrosis Factor-α Promotes Myocarditis in Female Mice Infected with Coxsackievirus B3 Through Upregulation of CD1d on Hematopoietic Cells