Monocyte recruitment and myelin removal are delayed following spinal cord injury in mice with CCR2 chemokine receptor deletion.

Abstract:

:The inflammatory response initiated after spinal cord injury (SCI) is characterized by the accumulation of macrophages at the impact site. Monocyte chemoattractant protein-1 (MCP-1) is a strong candidate for mediating chemotaxis of monocytes to the injured nervous system. To help in defining the role of MCP-1 in inflammation after SCI, we evaluated the time course of macrophage accumulation for 2 weeks following a midthoracic spinal cord contusion injury in mice lacking CCR2, a principal receptor for MCP-1. Mice with a deletion of CCR2 resulted in significantly reduced Mac-1 immunoreactivity restricted to the lesion epicenter at 7 days postinjury. The regions devoid of Mac-1 immunoreactivity corresponded to areas of reduced myelin degradation at this time. By 14 days postinjury, however, there were no differences in Mac-1 staining between CCR2 (+/+) and CCR2 (-/-) mice. Analyses of mRNA levels by RNase protection assay (RPA) revealed increases in MCP-1 as well as MCP-3 and MIP-2 mRNA at 1 day postinjury compared with 7 day postinjury. There were no differences in chemokine expression between CCR2-deficient mice and wild-type littermate controls. The CCR2-deficient mice also exhibited reduced expression of mRNA for chemokine receptors CCR1 and CCR5. Together, these results indicate that chemokines acting through CCR2 contribute to the early recruitment of monocytes to the lesion epicenter following SCI.

journal_name

J Neurosci Res

authors

Ma M,Wei T,Boring L,Charo IF,Ransohoff RM,Jakeman LB

doi

10.1002/jnr.10269

keywords:

subject

Has Abstract

pub_date

2002-06-15 00:00:00

pages

691-702

issue

6

eissn

0360-4012

issn

1097-4547

journal_volume

68

pub_type

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