Inflammation induces fibrinogen nitration in experimental human endotoxemia.
Elevated plasma fibrinogen is a prothrombotic risk factor for cardiovascular disease (CVD). Recent small studies report that fibrinogen oxidative modifications, specifically tyrosine residue nitration, can occur in inflammatory states and may modify fibrinogen function. HDL cholesterol is inversely related to CVD and suggested to reduce the oxidation of LDL cholesterol, but whether these antioxidant functions extend to fibrinogen modifications is unknown. We used a recently validated ELISA to quantify nitrated fibrinogen during experimental human endotoxemia (N=23) and in a cohort of healthy adults (N=361) who were characterized for inflammatory and HDL parameters as well as subclinical atherosclerosis measures, carotid artery intima-medial thickness (IMT) and coronary artery calcification (CAC). Fibrinogen nitration increased following endotoxemia and directly correlated with accelerated ex vivo plasma clotting velocity. In the observational cohort, nitrated fibrinogen was associated with levels of CRP and serum amyloid A. Nitrated fibrinogen levels were not lower with increasing HDL cholesterol and did not associate with IMT and CAC. In humans, fibrinogen nitration was induced during inflammation and was correlated with markers of inflammation and clotting function but not HDL cholesterol or subclinical atherosclerosis in our modest sample. Inflammation-induced fibrinogen nitration may be a risk factor for promoting CVD events.
Heffron
Sean P
SP
Cardiovascular Institute, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA.
Parastatidis
Ioannis
I
Cuchel
Marina
M
Wolfe
Megan L
ML
Tadesse
Mahlet G
MG
Mohler
Emille R
ER
Ischiropoulos
Harry
H
Rader
Daniel J
DJ
Reilly
Muredach P
MP
D000328:Adult; D015415:Biomarkers / Q000032:analysis; D002114:Calcinosis / Q000276:immunology / Q000378:metabolism / Q000473:pathology*; D002339:Carotid Arteries / Q000276:immunology / Q000378:metabolism / Q000473:pathology*; D002340:Carotid Artery Diseases / Q000276:immunology / Q000378:metabolism / Q000473:pathology*; D008076:Cholesterol, HDL; D019446:Endotoxemia / Q000276:immunology / Q000378:metabolism / Q000473:pathology*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005340:Fibrinogen / Q000032:analysis / Q000737:chemistry*; D006801:Humans; D007249:Inflammation; D008297:Male; D021241:Spectrometry, Mass, Electrospray Ionization; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D017539:Tunica Intima / Q000276:immunology / Q000378:metabolism / Q000473:pathology*; D055815:Young Adult
D015415:Biomarkers; D008076:Cholesterol, HDL; D005340:Fibrinogen