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- W2066685917 abstract "Limitation of reactive oxygen species-mediated ischemia-reperfusion (I/R) injury of the lung by vascular immunotargeting of antioxidative enzymes has the potential to become a promising modality for extension of the viability of banked transplantation tissue. The preferential expression of angiotensin-converting enzyme (ACE) in pulmonary capillaries makes it an ideal target for therapy directed toward the pulmonary endothelium. Conjugates of ACE monoclonal antibody (MAb) 9B9 with catalase (9B9-CAT) have been evaluated in vivo for limitation of lung I/R injury in rats. Ischemia of the right lung was induced for 60 min followed by 120 min of reperfusion. Sham-operated animals (sham, n = 6) were compared with ischemia-reperfused untreated animals (I/R, n = 6), I/R animals treated with biotinylated catalase (CAT, n = 6), and I/R rats treated with the conjugates (9B9-CAT, n = 6). The 9B9-CAT accumulation in the pulmonary endothelium of injured lungs was elucidated immunohistochemically. Arterial oxygenation during reperfusion was significantly higher in 9B9-CAT (221 ± 36 mmHg) and sham (215 ± 16 mmHg; P < 0.001 for both) compared with I/R (110 ± 10 mmHg) and CAT (114 ± 30 mmHg). Wet-dry weight ratio of I/R (6.78 ± 0.94%) and CAT (6.54 ± 0.87%) was significantly higher than of sham (4.85 ± 0.29%; P < 0.05), which did not differ from 9B9-CAT (5.58 ± 0.80%). The significantly lower degree of lung injury in 9B9-CAT-treated animals compared with I/R rats was also shown by decreased serum levels of endothelin-1 (sham, 18 ± 9 fmol/mg; I/R, 42 ± 12 fmol/mg; CAT, 36 ± 11 fmol/mg; 9B9-CAT, 26 ± 9 fmol/mg; P < 0.01) and mRNA for inducible nitric oxide synthase (iNOS) [iNOS-GAPDH ratio: sham, 0.15 ± 0.06 arbitrary units (a.u.); I/R, 0.33 ± 0.08 a.u.; CAT, 0.26 ± 0.05 a.u.; 9B9-CAT, 0.14 ± 0.04 a.u.; P < 0.001]. These results validate immunotargeting by anti-ACE conjugates as a prospective and specific strategy to augment antioxidative defenses of the pulmonary endothelium in vivo." @default.
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- W2066685917 date "2007-07-01" @default.
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- W2066685917 title "Immunotargeting of catalase to lung endothelium via anti-angiotensin-converting enzyme antibodies attenuates ischemia-reperfusion injury of the lung in vivo" @default.
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- W2066685917 doi "https://doi.org/10.1152/ajplung.00001.2007" @default.
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