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J. Virol., 10 1997, 7832-7840, Vol 71, No. 10
VC Asensio and IL Campbell
Chemokines are pivotal in the trafficking of leukocytes. In the present
study, we examined the expression of multiple chemokine genes during the
course of lymphocytic choriomeningitis (LCM) in mice. In noninfected mice,
no detectable chemokine gene expression was found in the brain; however, by
day 3 postinfection, the induction of a number of chemokine mRNAs was
observed as follows (in order from the greatest to the least): cytokine
responsive gene-2 or interferon-inducible 10- kDa protein (Crg-2/IP-10),
RANTES, monocyte chemotactic protein-1 (MCP- 1), macrophage inflammatory
protein-1 (MIP-1beta), and MCP-3. At day 6 postinfection, the expression of
these chemokine mRNAs was increased, and low expression of lymphotactin,
C10, MIP-2, and MIP-1alpha mRNAs was detectable. Transcript for T-cell
activation-3 was not detectable in the brain at any time following LCM
virus (LCMV) infection. With some exceptions, a pattern of chemokine gene
expression similar to that in the brain was observed in the peripheral
organs of LCMV-infected mice. Mice that lacked expression of gamma
interferon developed LCM and had a qualitatively similar but quantitatively
reduced cerebral chemokine gene expression profile. In contrast, little or
no chemokine gene expression was detectable in the brains of LCMV-infected
athymic mice which did not develop LCM. Expression of Crg-2/IP-10 RNA was
localized to predominantly resident cells of the central nervous system
(CNS) and overlapped with sites of viral infection and immune cell
infiltration. These findings demonstrate the expression of a number of
chemokine genes in the brains of mice infected with LCMV. The pattern of
chemokine gene expression in LCM may profoundly influence the
characteristic phenotype and response of leukocytes in the brain and
contribute to the immunopathogenesis of this fatal CNS infection.
Copyright © 1997, American Society for Microbiology
Chemokine gene expression in the brains of mice with lymphocytic choriomeningitis
Department of Neuropharmacology, The Scripps Research Institute, La Jolla, California 92037, USA.
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