Protective effects of early CD4(+) T cell reduction in hepatic ischemia/reperfusion injury.

Journal of Gastrointestinal Surgery : Official Journal of the Society for Surgery of the Alimentary Tract
Mathias MartinDirk Uhlmann

Abstract

CD4(+) T cells contribute to disturbances of liver microcirculation after warm ischemia/reperfusion (I/R). The aim of this study was to investigate a possible protective role of FTY720 (Sphingosine-1 phosphate receptor agonist) in this setting. In an in vivo model (42 Wistar rats), ischemia of the left liver lobe was induced for 90 min under anesthesia with xylazine/ketanest. Sham-operated untreated ischemic and treatment group with FTY720 (1 mg/kg body weight intravenous) were investigated. The effect of FTY on I/R injury was assessed by in vivo microscopy 30-90 min after reperfusion (perfusion rate, vessel diameter, leukocyte-endothelial cell interactions, T cell infiltration), by measurement of serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), reverse transcription-polymerase chain reaction (RT-PCR) of interleukin (IL)-2, IL-6, IL-10, TNF-alpha, toll-like receptor 4 (TLR-4), and by histological investigation. After 30 min of reperfusion, the number of T cells in sinusoids was increased four-fold. In the FTY group, the number of T cells was reduced to an half of the number of the ischemia group. Likewise, the number of adherent leukocytes in sinusoids (150.8 +/- 10.9% of s.o.) was reduced in the treatmen...Continue Reading

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