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Progranulin ameliorates coxsackievirus-B3-induced viral myocarditis by downregulating Th1 and Th17 cells.
Experimental Cell Research 2018 June 16
Viral myocarditis, which is caused by Coxsackievirus B3 (CVB3) infection, is a leading reason of sudden cardiac death in young adults. Progranulin (PGRN), a pleiotropic growth factor, has been shown to exert anti-inflammatory function in a variety of inflammatory diseases. However, the expression and function of PGRN in the pathogenesis of viral myocarditis remain largely unknown. In this study, we found that PGRN levels in plasma and cardiac tissues were significantly upregulated post CVB3 infection, and negative correlated with disease severity. PGRN deficiency significantly exacerbated, whereas recombinant PGRN treatment attenuated CVB3-induced myocarditis in mice. PGRN downregulated Th1 and Th17 cell responses and cytokine production in vitro and in vivo, whereas its effect on viral myocarditis was Treg cell independent. Furthermore, PGRN regulated Th1 and Th17 cells differentiation through inhibition of the JAK/STAT pathway. Therefore, our findings reveal a critical role for PGRN in reducing CVB3-induced myocarditis and suggest that PGRN maybe a novel therapeutic treatment for viral myocarditis.
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