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1 Stokes Research Institute and Neonatology Division, Department of Pediatrics, Children's Hospital of Philadelphia, and 3 Department of Biochemistry and Biophysics and 2 Pulmonary and Critical Care Division, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104
The present study identifies proteins
modified by nitration in the plasma of patients with ongoing acute
respiratory distress syndrome (ARDS). The proteins modified by
nitration in ARDS were revealed by microsequencing and specific
antibody detection to be ceruloplasmin, transferrin,
1-protease inhibitor,
1-antichymotrypsin, and
-chain fibrinogen. Exposure to nitrating agents did not deter the chymotrypsin-inhibiting activity of
1-antichymotrypsin. However, the ferroxidase activity of
ceruloplasmin and the elastase-inhibiting activity of
1-protease inhibitor were reduced to 50.3 ± 1.6 and 60.3 ± 5.3% of control after exposure to the nitrating agent. In
contrast, the rate of interaction of fibrinogen with thrombin was
increased to 193.4 ± 8.5% of the control value after exposure of
fibrinogen to nitration. Ferroxidase activity of ceruloplasmin and
elastase-inhibiting activity of the
1-protease inhibitor in the ARDS patients were significantly reduced (by 81 and 44%, respectively), whereas
1-antichymotrypsin activity was
not significantly altered. Posttranslational modifications of plasma
proteins mediated by nitrating agents may offer a biochemical
explanation for the reported diminished ferroxidase activity, elevated
levels of elastase, and fibrin deposits detected in patients with
ongoing ARDS.
nitric oxide; superoxide; ceruloplasmin;
1-protease
inhibitor; fibrinogen; oxidative stress
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