alexa Essential role for platelets in organ injury and inflammation in resuscitated hemorrhagic shock.
General Science

General Science

Journal of Bioterrorism & Biodefense

Author(s): Tweardy DJ, Khoshnevis MR, Yu B, Mastrangelo MA, Hardison EG,

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Abstract Platelets are known to contribute to ischemia/reperfusion in several organs, but their role in inflammation and organ injury after hemorrhagic shock (HS) has not been examined. To address this issue, we rendered mice thrombocytopenic (20\% of normal platelet count) by treatment with pOp3, a rat monoclonal antibody against platelet glycoprotein Ibalpha, 24 h before subjecting them to either a standard HS or sham protocol. Liver apoptosis increased 3- to 5-fold (P<0.05), and focal liver necrosis increased 11-fold (P<0.01) in placebo-treated shock mice compared with sham; these increased indices of liver injury were completely prevented by pOp3 pretreatment. Neutrophils infiltrating the liver increased nearly 3-fold in placebo-treated shock mice versus sham (P<0.05); this shock-induced increase in neutrophil infiltration was also eliminated by pretreatment with pOp3. Alveolar cross-sectional area, used to histologically assess interstitial lung edema and cellular infiltration, was reduced by 25\% in pOp3-treated shock mice versus placebo-treated shock mice (P<0.05). Similar to the results in liver, pOp3 pretreatment decreased neutrophil infiltration in the lung after HS. Thus, platelets contribute to the inflammatory injuries of the liver and lung after HS, in part, perhaps by facilitating neutrophil infiltration into tissues. This article was published in Shock and referenced in Journal of Bioterrorism & Biodefense

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