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Am J Pathol. 2005 Sep;167(3):887-99.

CXCR 3 activation promotes lymphocyte transendothelial migration across human hepatic endothelium under fluid flow.

Author information

  • 1Liver Research Group, Institute of Biomedical Research, MRC Centre for Immune Regulation, The University of Birmingham Medical School, Edgbaston, Birmingham, UK B15 2TT. s.m.curbishley@bham.ac.uk

Abstract

T cells infiltrating the inflamed liver express high levels of CXCR 3 and show enhanced migration to CXCR 3 ligands in chemotactic assays. Moreover, CXCR 3 ligands are up-regulated on hepatic endothelium at sites of T-cell infiltration in chronic hepatitis, and their presence correlates with outcome of inflammatory liver disease. We used a flow-based adhesion assay with human hepatic endothelium to investigate the function of CXCR 3 on lymphocyte adhesion to and transmigration through hepatic endothelium under physiological conditions of blood flow. To more accurately model the function of in vivo activated CXCR 3(high) lymphocytes, we isolated T cells from human liver tissue and studied their behavior in flow-based adhesion assays. We demonstrate that CXCR 3 not only promoted the adhesion of effector T cells to endothelium from flow but also drove transendothelial migration. Moreover, these responses could be stimulated either by endogenous CXCR 3 ligands secreted by the endothelium or by exogenous CXCR 3 ligands derived from other cell types and presented by the endothelium. This study thus demonstrates that activation of CXCR 3 promotes lymphocyte adhesion and transendothelial migration under flow and that human hepatic endothelium can present functionally active chemokines secreted by other cell types within the liver.

PMID:
16127166
[PubMed - indexed for MEDLINE]
PMCID:
PMC1698725
Free PMC Article
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