Free and protein-associated nitrotyrosine formation following rat liver preservation and transplantation

Archives of Biochemistry and Biophysics
K A SkinnerD A Parks

Abstract

Nitrotyrosine in human and animal tissues has been associated with pathologic conditions such as atherosclerosis, renal failure, and acute lung disease. In this study, free and protein-associated nitrotyrosine were determined in plasma and tissue samples using a dual-channel electrochemical detection method. Free nitrotyrosine was quantified in acetonitrile-extracted samples while protein-associated nitrotyrosine was determined in proteinase K-digested samples. In human plasma, total nitrotyrosine increased from 2.3 to 4.3 and 13.2 mumol/mol Tyr following addition of 0, 0.5, and 1 mM ONOO-. To determine if nitrotyrosine was produced during ex vivo hypothermic preservation, rat livers were stored in University of Wisconsin solution (UW) for 0, 6, or 8 h and reperfused for 3 h. Total nitro-tyrosine increased 359 and 908% after 6 and 8 h preservation compared to 0 h. To determine if nitrotyrosine was produced in vivo following hepatic ischemia, a rat preservation-transplantation model was utilized in which livers were flushed with cold UW (0-h group) or transplanted following 6 h hypothermic preservation in UW. Free nitrotyrosine increased from 15.7 +/- 0.3 in the 0-h group to 23.6 +/- 2.5 mumol/mol Tyr, 24 h posttransplant of 6-h...Continue Reading

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