CCL3/MIP-1alpha is pro-inflammatory in murine T cell-mediated hepatitis by recruiting CCR1-expressing CD4(+) T cells to the liver - PubMed (original) (raw)
. 2004 Oct;34(10):2907-18.
doi: 10.1002/eji.200425071.
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- PMID: 15368307
- DOI: 10.1002/eji.200425071
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CCL3/MIP-1alpha is pro-inflammatory in murine T cell-mediated hepatitis by recruiting CCR1-expressing CD4(+) T cells to the liver
Maureen N Ajuebor et al. Eur J Immunol. 2004 Oct.
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Abstract
T cell-mediated hepatitis is associated with significant morbidity and mortality worldwide. Levels of C-C chemokine ligand 3/macrophage inflammatory protein-1alpha (CCL3/MIP-1alpha) are elevated in the serum of patients with T cell-mediated liver diseases, but its role is not fully understood. Con A-induced hepatitis is a murine liver-specific inflammation mediated by activated T cells and is driven by an up-regulation of the hepatic expression of IFN-gamma. In this study, we have used CCL3/MIP-1alpha gene-deficient mice to examine the role of CCL3/MIP-1alpha in the pathogenesis of Con A-induced hepatitis. We demonstrate a novel pro-inflammatory role for CCL3/MIP-1alpha since CCL3/MIP-1alpha deficiency significantly attenuated hepatic injury, both biochemically and histologically. Moreover, the recruitment of CCR1-expressing CD4(+) T cells to the liver after Con A treatment was strikingly attenuated by CCL3/MIP-1alpha deficiency. Correspondingly, hepatic IFN-gamma produced by the recruited CD4(+) T cells was significantly reduced by CCL3/MIP-1alpha deficiency during Con A-induced hepatitis. Furthermore, treatment of mice with a dual CCR1/CCR5 peptide antagonist, methionylated RANTES, also markedly reduced hepatic injury and decreased the numbers of CD4(+) T cells within the liver producing IFN-gamma during Con A-induced hepatitis. These findings demonstrate that blockade of the CCL3/MIP-1alpha-CCR1 pathway may represent a novel therapeutic target for treating T cell-mediated liver diseases.
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