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1篇 您的检索式:作者名="Pina Colarusso"
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1Platelet aggregation but not activation and degranulation during the acute post-ischemic reperfusion phase in livers with no underlying disease显示文摘Background:Platelets and P-selectin(CD62P)play an unequivocal role in the pathology of hepatic ischemia/reperfusion(I/R)injury.Inhibition or knock-out of P-selectin or immunodepletion of platelets results in amelioration of post-ischemic inflammation,reduced hepatocellular damage,and improved survival.However,P-selectin expression on platelets and endothelial cells,which concurs with platelet activation,has never been clearly demonstrated in I/R-subjected livers.Aims:To determine whether platelets become activated and degranulate in the acute phase of liver I/R and whether the platelets interact with neutrophils.Methods:Hepatic I/R was induced in male C57BL/6J mice(N=12)using 37.5-min ischemia time.Platelets,endothelial cells,and neutrophils were fluorescently labeled by systemic administration of non-blocking antibodies.Cell kinetics were monitored by intravital spinning disk confocal microscopy during 90 min of reperfusion.Image analysis and quantification was performed with dedicated software.Results:Platelets adhered to sinusoids more extensively in post-ischemic livers compared to livers not subjected to I/R and formed aggregates,which occurred directly after ischemia.Platelets and endothelial cells did not express P-selectin in post-ischemic livers.There was no interaction between platelets and neutrophils.Conclusions:Platelets aggregate but do not become activated and do not degranulate in post-ischemic livers.There is no platelet-neutrophil interplay during the early reperfusion phase in a moderate model of hepatic I/R injury.The mechanisms underlying the biological effects of platelets and P-selectin in this setting warrant further investigation.Relevance for patients:I/R in surgical liver patients may compromise outcome due to post-ischemic oxidative stress and sterile inflammation.Both processes are mediated in part by platelets.Understanding platelet function during I/R is key to developing effective interventions for I/R injury and improving clinical outcomes.Rowan F.van Golen Katarzyna M.Stevens Pina Colarusso Hartmut Jaeschke Michal Heger 2015Journal of Clinical & Translational Research2015,1,2:2
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