Daniel Liebler
Faculty Member
Last active: 2/15/2016

Increased protein nitration burden in the atherosclerotic lesions and plasma of apolipoprotein A-I deficient mice.

Parastatidis I, Thomson L, Fries DM, Moore RE, Tohyama J, Fu X, Hazen SL, Heijnen HF, Dennehy MK, Liebler DC, Rader DJ, Ischiropoulos H
Circ Res. 2007 101 (4): 368-76

PMID: 17615369 · DOI:10.1161/CIRCRESAHA.107.157537

Apolipoprotein A-I (apoA-I), the major protein constituent within high-density lipoprotein (HDL), has been associated with antiatherogenic protection by mechanisms that include reverse cholesterol transport and antiinflammatory functions. To evaluate the proposed protective function of apoA-I, proteins modified by nitrating oxidants were evaluated in the aortic tissue and plasma of mice lacking the low-density lipoprotein receptor and apobec (LA) and LA mice with genetic deletion of apoA-I (LA-apoA-I(-/-)). The levels of nitrated proteins in aortic tissue quantified by liquid chromatography with online electrospray ionization tandem mass spectrometry (LC/ESI/MS/MS) were 6-fold higher in the LA-apoA-I(-/-) as compared with the LA mice. The quantitative analyses were corroborated by immunohistochemical and high-resolution immunoelectron microscopic evaluation of the lesions, which revealed abundant staining for nitrated proteins in the aortic root lesions of LA-apoA-I(-/-) as compared with the LA mice. Proteomic approaches based on affinity enrichment and site-specific adduct mapping identified unique specific protein targets for nitration in the plasma of LA-apoA-I(-/-) that were not present in the plasma of LA mice. In particular the nitration of fibrinogen was shown to accelerate fibrin clot formation. Another consequence of the augmented levels of nitrated proteins was the induction of humoral responses documented by the increased circulating immunoglobulins that recognize nitrotyrosine in LA-apoA-I(-/-) as compared with the LA mice. These data collectively support a protective function of apoA-I diminishing the burden of nitrative oxidants in these mice models of atherosclerosis.

MeSH Terms (21)

Animals Aorta Apolipoprotein A-I Atherosclerosis Autoantibodies Blood Coagulation Blood Proteins Cholesterol, HDL Disease Models, Animal Female Fibrin Fibrinogen Immunohistochemistry Mice Mice, Inbred C57BL Mice, Knockout Microscopy, Immunoelectron Nitrogen Oxidants Proteomics Tyrosine

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