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Strain-specific differences in sensitivity to ischemia-reperfusion lung injury in mice

¹Department of Anesthesia and Critical Care, School of Medicine; ²Division of Pulmonary and Critical Care Medicine, Department of Medicine, School of Medicine; and ³Department of Environmental Health Sciences, Bloomberg School of Public Health, The Johns Hopkins Medical Institutions, Baltimore, Maryland

Submitted 8 June 2005 ; accepted in final form 21 January 2006

Ischemia-reperfusion (I/R) lung injury is characterized by increased pulmonary endothelial permeability and edema, but the genetic basis for this injury is unknown. We utilized an in vivo mouse preparation of unilateral lung I/R to evaluate the genetic determinants of I/R lung injury. An index of pulmonary vascular protein permeability was measured by the ratio of left-to-right lung Evans blue dye of eight inbred mouse strains after 30 min of left lung ischemia and 150 min of reperfusion. The order of strain-specific sensitivity to I/R lung injury was BALB/c < SJL/J < CBA/J < C57BL/6J < 129/J < A/J < C3H/H3J < SWR/J. The reciprocal F1 offspring of the BALB/c and SWR/J progenitor strains had intermediate phenotypes but a differing variance. A similar pattern of right lung Evans blue dye content suggested the presence of contralateral injury because baseline vascular permeability was not different. Lung I/R injury was attenuated by NADPH oxidase inhibition, indicating a role for NADPH oxidase-derived reactive oxygen species (ROS). There was no strain-dependent difference in lung NADPH oxidase expression. Strain-related differences in zymosan-stimulated neutrophil ROS production did not correlate with I/R lung injury in that neutrophil ROS production in SWR/J mice was greater than C57BL/6J but not different from BALB/c mice. These data indicate the presence of a genetic sensitivity to lung I/R injury that involves multiple genes including a maternal-related factor. Although neutrophil-derived ROS production is also modulated by genetic factors, the pattern did not explain the genetic sensitivity to lung I/R injury.

vascular permeability; edema; Evans blue dye; NADPH oxidase; p22^phox

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