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J Hepatol. 2009 Apr;50(4):755-65. doi: 10.1016/j.jhep.2008.11.027. Epub 2009 Feb 7.

Leukocyte transmigration in inflamed liver: A role for endothelial cell-selective adhesion molecule.

Author information

1
Department of Surgery, Ludwig-Maximilians-Universit√§t M√ľnchen, Marchioninistr. 15, D-81377 Munich, Germany. Andrej.Khandoga@med.uni-muenchen.de

Abstract

BACKGROUND/AIMS:

This study was designed to investigate the role of endothelial cell-selective adhesion molecule (ESAM), a recently discovered receptor expressed in endothelial tight junctions and platelets, for leukocyte migration in inflamed liver.

METHODS:

The role of ESAM for leukocyte migration in the liver was analyzed using ESAM-deficient mice in a model of warm hepatic ischemia-reperfusion (90min/30-360min).

RESULTS:

As shown by immunostaining, ESAM is expressed in sinusoids as well as in venules and is not upregulated upon I/R. Emigrated leukocytes were quantified in tissue sections. Postischemic neutrophil transmigration was significantly attenuated in ESAM-/- mice after 2h of reperfusion, whereas it was completely restored after 6h. In contrast, T-cell migration did not differ between ESAM+/+ and ESAM-/- mice. Using intravital microscopy, we demonstrate that ESAM deficiency attenuates I/R-induced vascular leakage after 30min of reperfusion. The I/R-induced elevation in AST/ALT activity, the sinusoidal perfusion failure, and the number of TUNEL-positive hepatocytes were comparable between ESAM+/+ and ESAM-/- mice.

CONCLUSIONS:

ESAM is expressed in the postischemic liver and mediates neutrophil but not T-cell transmigration during early reperfusion. ESAM deficiency attenuates I/R-induced vascular leakage and does not affect leukocyte adherence. Despite the effect on neutrophil migration, ESAM-deficiency does not protect from I/R-induced injury.

PMID:
19231013
DOI:
10.1016/j.jhep.2008.11.027
[Indexed for MEDLINE]
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