EBV induces the production and release of IL-8 and macrophage inflammatory protein-1 α in human neutrophils

Abstract

As the first line of defense in the immune system, neutrophils may release a variety of potent agents upon exposure to infectious agents. In this study we have investigated the ability of human neutrophils to produce chemotactic cytokines, or chemokine in response to EBV. Exposure of neutrophils to EBV led to an increase in accumulation of mRNA for IL-8 and macrophage inflammatory protein-1alpha (MIP-1alpha). EBV stimulated a time-dependent production of immunoreactive IL-8 and MIP-1alpha by neutrophils. The ability of EBV to stimulate the synthesis of IL-8 and MIP-1alpha protein was reflected by both an accumulation of the protein in the intracellular compartment as well as increased secretion. A variety of control studies support the idea that infectious EBV is not required for induction of chemokine gene expression; however, the response is dependent on the interaction between the glycoprotein gp350 of the viral envelope and the neutrophil surface. Since both IL-8 and MIP-1alpha are reported to be chemoattractants in vitro for T cells and for T and B cells, respectively, the ability of EBV to induce their production by neutrophils may enhance the ability of this virus to infect B and T lymphocytes via increased recruitment to sites of infection.