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Mechanisms of the beneficial effect of NHE1 inhibitor in traumatic hemorrhage: inhibition of inflammatory pathways.

Abstract：

:This study evaluated the effects of sodium-hydrogen exchanger (NHE1) inhibition on enhancing fluid resuscitation outcomes in traumatic hemorrhagic shock, and examined the mechanisms related to NHE1 inhibitor-induced protection and recovery from hemorrhagic shock. Traumatic hemorrhage was modeled in anesthetized pigs by producing tibia fractures followed by hemorrhage of 25 ml/kg for 20 min, and then a 4mm hepatic arterial tear with surgical repair after 20 min. Animals then underwent low volume fluid resuscitation with either hextend (n=6) or 3mg/kg BIIB513 (NHE1 inhibitor)+hextend (n=6). The experiment was terminated 6h after the beginning of resuscitation. In association with traumatic hemorrhagic shock, there was a decrease in cardiac index, stimulation of the inflammatory response, myocardial, liver and kidney injury. The administration of the NHE1 inhibitor at the time of resuscitation attenuated shock-resuscitation-induced myocardial hypercontracture and resulted in a significant increase in stroke volume index, compared to vehicle-treated controls. NHE1 inhibition also reduced the inflammatory response, and lessened myocardial, liver and kidney injury. In addition, NHE1 inhibition reduced NF-κB activation and iNOS expression, and attenuated of ERK1/2 phosphorylation. Results from the present study indicate that NHE1 inhibition prevents multiple organ injury by attenuating shock-resuscitation-induced myocardial hypercontracture and by inhibiting NF-κB activation and neutrophil infiltration, reducing iNOS expression and ERK1/2 phosphorylation, thereby, reducing systemic inflammation and thus multi-organ injury.

journal_name

Resuscitation

journal_title

Resuscitation

authors

Wu D,Qi J

doi

10.1016/j.resuscitation.2011.11.025

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

774-81

issue

6

eissn

0300-9572

issn

1873-1570

pii

S0300-9572(11)00679-4

journal_volume

83

pub_type

杂志文章

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