Identification and characterization of human eosinophil cationic protein by an epitope-specific antibody.
J Leukoc Biol
; 69(6): 1027-35, 2001 Jun.
Article
in En
| MEDLINE
| ID: mdl-11404391
ABSTRACT
The eosinophil cationic protein (ECP) is a basic secretion protein involved in the immune response system. ECP levels in biological fluids are an indicator of eosinophil-specific activation and degranulation and are currently used for the clinical monitoring and diagnosis of inflammatory disorders. A polyclonal epitope-specific antibody has been obtained by immunizing rabbits with a conjugated synthetic peptide. A sequence corresponding to a large exposed loop in the human ECP three-dimensional structure (D115-Y122) was selected as a putative antigenic epitope. The antibody was purified on an affinity column using recombinant ECP (rECP) as antigen. The antibody (D112-P123 Ab) specifically recognizes rECP and its native glycosylated and nonglycosylated forms in plasma, granulocytes, and sputum. The antibody detects as little as 1 ng of rECP, can be used both in reducing and nonreducing conditions, and does not cross-react with the highly homologous eosinophil-derived neurotoxin or other proteins of the pancreatic ribonuclease superfamily.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Ribonucleases
/
Blood Proteins
/
Antibodies, Monoclonal
Type of study:
Diagnostic_studies
Limits:
Animals
/
Humans
Language:
En
Journal:
J Leukoc Biol
Year:
2001
Document type:
Article