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J Appl Physiol 93: 620-628, 2002; doi:10.1152/japplphysiol.01200.2001
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Vol. 93, Issue 2, 620-628, August 2002

Time course of lung ischemia-reperfusion-induced ICAM-1 expression and its role in ischemia-reperfusion lung injury

Yen-Ta Lu1, Pai-Gene Chen1, and Shu Fang Liu2

1 Division of Chest Medicine and Department of Medical Research, Mackay Memorial Hospital, Taipei Medical University, Taipei, Taiwan; and 2 Division of Pulmonary and Critical Care Medicine, Long Island Jewish Medical Center, The Long Island Campus for the Albert Einstein College of Medicine, New Hyde Park, New York 11040

Upregulation of intercellular adhesion molecule-1 (ICAM-1) expression is an important mechanism underlying ischemia-reperfusion (I/R) induced neutrophil activation and tissue injury in other organs. However, I/R of the lungs has not been shown to upregulate ICAM-1 expression. We determined the time course profile of lung I/R-induced ICAM-1 expression and assessed the role of ICAM-1 in mediating neutrophil sequestration, transmigration, and I/R injury in the isolated blood-perfused rat lungs. I/R had a biphasic effect on ICAM-1 expression, an early downregulation and a late-phase upregulation. Superoxide dismutase and neutrophil depletion prevented the early ICAM-1 downregulation. The late-phase ICAM-1 upregulation coincided with the I/R-induced increase in pulmonary microvascular leakage index. ICAM-1 monoclonal antibody (MAb) reversed the I/R-induced increase in pulmonary microvascular leakage index, with control antibody being ineffective. Neither I/R nor ICAM-1 MAb affected lung MPO activity and circulating neutrophil count. Lung I/R significantly increased bronchoalveolar lavage fluid neutrophil count and the GSSG-to-(GSSG+GSH) ratio. ICAM-1 MAb blocked the I/R-induced increase in GSSG-to-(GSSG+GSH) ratio but had no effect on bronchoalveolar lavage fluid neutrophil count. Our results demonstrated that lung I/R up- and downregulates ICAM-1 expression depending on the duration of reperfusion. ICAM-1 upregulation is an important mechanism of I/R-induced pulmonary endothelial injury.

intercellular adhesion molecule-1; redox status; neutrophil; rat; microvascular permeability


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