INVESTIGADORES
RAMIREZ Dario
congresos y reuniones científicas
Título:
NOVEL IMMUNO-SPIN TRAPPING-BASED ASSAY FOR THE ANALYSIS OF MYELOPEROXIDASE
Autor/es:
DARIO C. RAMIREZ; SANDRA E. GOMEZ-MEJIBA; RONALD P. MASON; JEAN T. CORBETT
Lugar:
Miami Beach, FL
Reunión:
Congreso; Annual Meeting of the American Association of Immunologists; 2007
Institución organizadora:
AAI
Resumen:
Novel immuno-spin trapping-based assay for the
analysis of myeloperoxidase
DARIO C RAMIREZ , SANDRA E GOMEZ-MEJIBA , JEAN T CORBETT and RONALD P
MASON
LPC, NIEHS, NIH, 111 T.W. Alexander Dr., Research Triangle Park, NC, 27709
Abstract
Myeloperoxidase (MPO) is an important biomarker of inflammatory diseases. The analyses
of MPO in biological samples are based on detection of its peroxidase activity, chloramine
formation, and MPO-capture immunoassays. We have developed an immuno-spin trapping
(IST)-based approach to determine MPO in biological samples. In this approach,
MPO/H2O2/Cl system produces i. hypochlorous acid (HOCl);
ii. HOCl reacts with proteins forming chloramines;
iii. chloramines decay forming protein radicals,
protein radicals are trapped by the nitrone spin trap 5,5-dimethyl-1-pyrroline N
ii. HOCl reacts with proteins forming chloramines;
iii. chloramines decay forming protein radicals,
protein radicals are trapped by the nitrone spin trap 5,5-dimethyl-1-pyrroline N
ii. HOCl reacts with proteins forming chloramines;
iii. chloramines decay forming protein radicals,
protein radicals are trapped by the nitrone spin trap 5,5-dimethyl-1-pyrroline N
ii. HOCl reacts with proteins forming chloramines;
iii. chloramines decay forming protein radicals,
protein radicals are trapped by the nitrone spin trap 5,5-dimethyl-1-pyrroline N
ii. HOCl reacts with proteins forming chloramines;
iii. chloramines decay forming protein radicals,
protein radicals are trapped by the nitrone spin trap 5,5-dimethyl-1-pyrroline N
2O2/Cl system produces i. hypochlorous acid (HOCl);
ii. HOCl reacts with proteins forming chloramines;
iii. chloramines decay forming protein radicals,
protein radicals are trapped by the nitrone spin trap 5,5-dimethyl-1-pyrroline NN
-oxide (DMPO) forming DMPO-protein nitrone adducts, and
iv.
nitrone adducts are determined using a chemiluminescent direct ELISA with
the anti-DMPO antiserum.
v.
We used this assay to quantify MPO in plasma, bronchoalveolar fluid and lung parenchyma
of rats exposed to lipopolysaccharide, and compared its sensitivity with a capture-based
commercial ELISA kit. Hemoglobin does not interfere and the assay can be used in animal
and human samples. The assay has three levels of amplification:
i. enzymatic formation of HOCl;
ii. many DMPO molecules bound per single protein molecule;
iii. a sensitive developing system.
The IST-based assay for quantification of MPO will enhance the power of this biomarker for
early detection of environmental- and metabolic-induced inflammatory disorders in both
experimental and clinical settings. NIH#1K99 ES015414-01NIH#1K99 ES015414-01
Novel immuno-spin trapping-based assay for the analysis of myeloperoxidase -- RAMIR... Page 1 of 1
http://