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This Article Full Text Full Text (PDF) All Versions of this Article: 290/6/H2220    most recent 01293.2005v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (20) Citing Articles via Google Scholar Google Scholar Articles by Xu, S. Articles by Cohen, R. A. Search for Related Content PubMed PubMed Citation Articles by Xu, S. Articles by Cohen, R. A.

Detection of sequence-specific tyrosine nitration of manganese SOD and SERCA in cardiovascular disease and aging

¹Vascular Biology Unit, Whitaker Cardiovascular Institute, Evans Department of Medicine and ²Department of Surgery, Boston University Medical Center, Boston, Massachusetts; ³Cell Biology and Biochemistry Group, Biological Sciences Division, Pacific Northwest National Laboratory, Richland, Washington; and ⁴Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, Kansas

Submitted 8 December 2005 ; accepted in final form 2 January 2006

Nitration of protein tyrosine residues (nY) is a marker of oxidative stress and may alter the biological activity of the modified proteins. The aim of this study was to develop antibodies toward site-specific nY-modified proteins and to use histochemistry and immunoblotting to demonstrate protein nitration in tissues. Affinity-purified polyclonal antibodies toward peptides with known nY sites in MnSOD nY-34 and of two adjacent nY in the sarcoplasmic endoplasmic reticulum calcium ATPase (SERCA2 di-nY-294,295) were developed. Kidneys from rats infused with ANG II with known MnSOD nY and aorta from atherosclerotic rabbits and aging rat skeletal and cardiac sarcoplasmic reticulum with known SERCA di-nY were used for positive controls. Staining for MnSOD nY-34 was most intense in distal renal tubules and collecting ducts. Staining of atherosclerotic aorta for SERCA2 di-nY was most intense in atherosclerotic plaques. Aging rat skeletal muscle and atherosclerotic aorta and cardiac atrium from human diabetic patients also stained positively. Staining was decreased by sodium dithionite, which chemically reduces nitrotyrosine to aminotyrosine, and the antigenic nY-peptide blocked staining for each respective nY site but not for the other. As previously demonstrated, immunoblotting failed to detect these modified proteins in whole tissue lysates but did when the proteins were concentrated. Immunohistochemical staining for specific nY-modified tyrosine residues offers the ability to assess the effects of oxidant stress associated with pathological conditions on individual proteins whose function may be affected in specific tissue sites.

nitrotyrosine; manganese superoxide dismutase; sarcoplasmic endoplasmic reticulum calcium adenosinetriphosphatase; antibody; immunohistochemistry

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