Journal
AMERICAN JOURNAL OF RESPIRATORY CELL AND MOLECULAR BIOLOGY
Volume 36, Issue 2, Pages 152-157Publisher
AMER THORACIC SOC
DOI: 10.1165/rcmb.2006-0288SM
Keywords
tyrosine nitration; oxidative stress; immunoglobulins; affinity chromatography; biological markers
Funding
- NHLBI NIH HHS [P50 HL60290, P01 HL076491] Funding Source: Medline
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Tyrosine nitration is a nitric oxide-derived post-translational modification of proteins. Elevated levels of specific plasma proteins modified by tyrosine nitration have been detected during acute and chronic inflammatory conditions, including acute lung injury (ALI). In the present study we examined whether circulating immunoglobulins against nitrated proteins are present in the plasma of subjects with clinically documented ALI. Affinity chromatography using covalently linked 3-nitrotyrosine was employed to identify plasma proteins that bind to this unusual amino acid. Western blotting and liquid chromatography-tandem mass spectrometry of in-gel digested protein bands revealed that the major proteins eluted from the affinity column were IgM and IgG. An enzyme-linked immunosorbent assay (ELISA) based on competition of horseradish peroxidase-derivatized 3-nitrotyrosine binding to plasma with unlabeled 3-nitrotyrosine was developed and validated. Using this ELISA, the levels of immunoglobulins that recognize 3-nitrotyrosine were significantly higher in the plasma of subjects with ALI compared with both normal control subjects and subjects with major trauma who did not develop ALI (0.36 +/- 0.14 versus 0.03 +/- 0.05, and 0.25 +/- 0.15; P < 0.001 and P = 0.006, respectively). These data indicate that tyrosine-nitrated proteins induce the production of specific immunoglobulins during acute phase response and inflammation.
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