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Journal of Neuroinflammation
Published in: Journal of Neuroinflammation 1/2011

Open Access 01-12-2011 | Research

Lateral fluid percussion injury of the brain induces CCL20 inflammatory chemokine expression in rats

Authors: Mahasweta Das, Christopher C Leonardo, Saniya Rangooni, Keith R Pennypacker, Subhra Mohapatra, Shyam S Mohapatra

Published in: Journal of Neuroinflammation | Issue 1/2011

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Abstract

Background

Traumatic brain injury (TBI) evokes a systemic immune response including leukocyte migration into the brain and release of pro-inflammatory cytokines; however, the mechanisms underlying TBI pathogenesis and protection are poorly understood. Due to the high incidence of head trauma in the sports field, battlefield and automobile accidents identification of the molecular signals involved in TBI progression is critical for the development of novel therapeutics.

Methods

In this report, we used a rat lateral fluid percussion impact (LFPI) model of TBI to characterize neurodegeneration, apoptosis and alterations in pro-inflammatory mediators at two time points within the secondary injury phase. Brain histopathology was evaluated by fluoro-jade (FJ) staining and terminal deoxynucleotidyl transferase dUTP nick end labelling (TUNEL) assay, polymerase chain reaction (qRT PCR), enzyme linked immunosorbent assay (ELISA) and immunohistochemistry were employed to evaluate the CCL20 gene expression in different tissues.

Results

Histological analysis of neurodegeneration by FJ staining showed mild injury in the cerebral cortex, hippocampus and thalamus. TUNEL staining confirmed the presence of apoptotic cells and CD11b+ microglia indicated initiation of an inflammatory reaction leading to secondary damage in these areas. Analysis of spleen mRNA by PCR microarray of an inflammation panel led to the identification of CCL20 as an important pro-inflammatory signal upregulated 24 h after TBI. Although, CCL20 expression was observed in spleen and thymus after 24h of TBI, it was not expressed in degenerating cortex or hippocampal neurons until 48 h after insult. Splenectomy partially but significantly decreased the CCL20 expression in brain tissues.

Conclusion

These results demonstrate that the systemic inflammatory reaction to TBI starts earlier than the local brain response and suggest that spleen- and/ or thymus-derived CCL20 might play a role in promoting neuronal injury and central nervous system inflammation in response to mild TBI.
Appendix
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Metadata
Title
Lateral fluid percussion injury of the brain induces CCL20 inflammatory chemokine expression in rats
Authors
Mahasweta Das
Christopher C Leonardo
Saniya Rangooni
Keith R Pennypacker
Subhra Mohapatra
Shyam S Mohapatra
Publication date
01-12-2011
Publisher
BioMed Central
Published in
Journal of Neuroinflammation / Issue 1/2011
Electronic ISSN: 1742-2094
DOI
https://doi.org/10.1186/1742-2094-8-148

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