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Inflammatory monocyte (iMO) recruitment to the brain is a hallmark of many neurologic diseases. Prior to entering the brain, iMOs must egress into the blood from the bone marrow through a mechanism, which for known encephalitic viruses, is CCR2 dependent. In this article, we show that during La Crosse Virus-induced encephalitis, egress of iMOs was surprisingly independent of CCR2, with similar percentages of iMOs in the blood and brain of heterozygous and CCR2 -/- mice following infection. Interestingly, CCR2 was required for iMO trafficking from perivascular areas to sites of virus infection within the brain. Thus, CCR2 was not essential for iMO trafficking to the blood or the brain but was essential for trafficking within the brain parenchyma. Analysis of other orthobunyaviruses showed that Jamestown Canyon virus also induced CCR2-independent iMO egress to the blood. These studies demonstrate that the CCR2 requirement for iMO egress to the blood is not universal for all viruses.

the journal of immunology/the journal of immunology

Cutting Edge: CCR2 Is Not Required for Ly6Chi Monocyte Egress from the Bone Marrow but Is Necessary for Migration within the Brain in La Crosse Virus Encephalitis