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. 2003;9(6):623–636. doi: 10.1080/13550280390247551

CCL2 transgene expression in the central nervous system directs diffuse infiltration of CD45highCD11b+ monocytes and enhanced Theiler’s murine encephalomyelitis virus-induced demyelinating disease

Jami L Bennett 1, Adam Elhofy 1, Mauro C Dal Canto 1, Mari Tani 2, Richard M Ransohoff 2, William J Karpus 1,✉
PMCID: PMC7095321  PMID: 14602575

Abstract

CCL2 is a member of the CC chemokine family that mediates the migration and recruitment of monocytes and T cells and has been identified in the central nervous system (CNS) during several neuroinflammatory diseases. In order to examine the biological effect of constitutive CCL2 expression in the CNS, the authors engineered a mouse that expressed CCL2 in the CNS under control of the human glial fibrillary acidic protein (hGFAP) promoter. The results demonstrated that transgenic expression of CCL2 in the CNS resulted in diffuse CNS monocyte infiltration and accumulation. Transgenic CCL2 expression did not alter normal development, differentiation, or function of T cells. There was no evidence of overt CNS disease or other pathologic phenotype when mice were left unchallenged with antigen or uninfected. However, when CCL2 transgenic mice were given a peripheral challenge of lipopolysaccharide (LPS), an inflammatory infiltrate with organized perivascular lesions developed. Infection of the transgenic mice with Theiler’s murine encephalomyelitis virus (TMEV) resulted in accelerated onset and increased severity of clinical and histological disease. These results suggest that CCL2 expression in the CNS is a major pathogenic factor that drives macrophage accumulation in the development of CNS inflammatory disease.

Keywords: chemokines, chemotaxis, CNS inflammation, monocyte recruitment, multiple sclerosis, neuroinflammation

Footnotes

This work was supported by NMSS RG3056-A-2 and NIH P01 NS23349 (Project 3) (WJK), NIH T32 AI07476-06 (JLB), National Multiple Sclerosis Society post-doctoral fellowship (MT), andNIH R01 NS32151 (RMR).

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