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• W2007490635 abstract "Neutrophils are thought to play a major role in the mediation of reperfusion injury. CXC chemokines are known inducers of neutrophil recruitment. Here, we assessed the effects of Repertaxin, a novel low molecular weight inhibitor of human CXCL8 receptor activation, on the local, remote and systemic injuries following intestinal ischaemia and reperfusion (I/R) in the rat.Pre-incubation of rat neutrophils with Repertaxin (10−11–10−6M) inhibited the chemotaxis of neutrophils induced by human CXCL8 or rat CINC-1, but not that induced by fMLP, PAF or LTB4, in a concentration-dependent manner. Repertaxin also prevented CXCL8-induced calcium influx but not CXCL8 binding to purified rat neutrophils.In a model of mild I/R injury (30 min of ischaemia and 30 min of reperfusion), Repertaxin dose-dependently (3–30 mg kg−1) inhibited the increase in vascular permeability and neutrophil influx. Maximal inhibition occurred at 30 mg kg−1.Following severe I/R injury (120 min of ischaemia and 120 min of reperfusion), Repertaxin (30 mg kg−1) markedly prevented neutrophil influx, the increase in vascular permeability both in the intestine and the lungs. Moreover, there was prevention of haemorrhage in the intestine of reperfused animals.Repertaxin effectively suppressed the increase in tissue (intestine and lungs) and serum concentrations of TNF-α and the reperfusion-associated lethality.For comparison, we also evaluated the effects of an anti-CINC-1 antibody in the model of severe I/R injury. Overall, the antibody effectively prevented tissue injury, systemic inflammation and lethality. However, the effects of the antibody were in general of lower magnitude than those of Repertaxin.In conclusion, CINC-1 and possibly other CXC chemokines, acting on CXCR2, have an important role during I/R injury. Thus, drugs, such as Repertaxin, developed to block the function of the CXCR2 receptor may be effective at preventing reperfusion injury in relevant clinical situations.British Journal of Pharmacology (2004) 143, 132–142. doi:10.1038/sj.bjp.0705862" @default.
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• W2007490635 date "2004-09-01" @default.
• W2007490635 modified "2023-10-18" @default.
• W2007490635 title "Repertaxin, a novel inhibitor of rat CXCR2 function, inhibits inflammatory responses that follow intestinal ischaemia and reperfusion injury" @default.
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• W2007490635 doi "https://doi.org/10.1038/sj.bjp.0705862" @default.
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