The major virus-producing cell type during murine cytomegalovirus infection, the hepatocyte, is not the source of virus dissemination in the host

Cell Host & Microbe
Torsten SacherUlrich Koszinowski

Abstract

The course of systemic viral infections is determined by the virus productivity of infected cell types and the efficiency of virus dissemination throughout the host. Here, we used a cell-type-specific virus labeling system to quantitatively track virus progeny during murine cytomegalovirus infection. We infected mice that expressed Cre recombinase selectively in vascular endothelial cells or hepatocytes with a murine cytomegalovirus for which Cre-mediated recombination would generate a fluorescently labeled virus. We showed that endothelial cells and hepatocytes produced virus after direct infection. However, in the liver, the main contributor to viral load in the mouse, most viruses were produced by directly infected hepatocytes. Remarkably, although virus produced in hepatocytes spread to hepatic endothelial cells (and vice versa), there was no significant spread from the liver to other organs. Thus, the cell type producing the most viruses was not necessarily the one responsible for virus dissemination within the host.

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