Persistence of respiratory syncytial virus in macrophages alters phagocytosis and pro-inflammatory cytokine production.

Functions of macrophage are known to be altered by acute infection with respiratory syncytial virus (RSV). However, it is unknown whether the persistent presence and expression of the RSV genome have any effect on the functions of these cells. We used a murine macrophage-like cell line (P388D1) persistently infected with RSV to determine: (i) phagocytic activity mediated by Fcgamma receptors, (ii) expression of Fcgamma receptors, and (iii) production of IL-1beta, IL-6 and TNF-alpha. Viral persistence was found to increase phagocytosis, expression of Fcgamma receptors and the production of IL-1beta and IL-6. In contrast the biological activity of secreted TNF-alpha decreased. In this study we give novel evidence that RSV persistence alters the biological activities of macrophages.

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