Humoral immune response to cruzipain and cardiac dysfunction in chronic Chagas disease

The humoral immune response to epitopes expressed on cruzipain was evaluated in 31 Chagas disease patients (CDP) with different degrees of cardiac dysfunction. We took advantage of the availability of anti- Trypanosoma cruzi microsomal fraction monoclonal antibodies (MoAbs) reactive with epitopes th...

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Bibliographic Details
Published in:Immunology letters 2001-10, Vol.78 (3), p.135-142
Main Authors: Duschak, Vilma G, Riarte, Adelina, Segura, Elsa L, Laucella, Susana A
Format: Article
Language:English
Subjects:
Adult
Aged
Antibodies, Blocking - blood
Antibodies, Protozoan - biosynthesis
Antibodies, Protozoan - blood
Antibodies, Protozoan - metabolism
Antibody Specificity - immunology
Antigens, Protozoan - chemistry
Antigens, Protozoan - immunology
Binding Sites, Antibody
Binding, Competitive - immunology
Carbohydrates - blood
Carbohydrates - immunology
Chagas Cardiomyopathy - blood
Chagas Cardiomyopathy - immunology
Chagas Cardiomyopathy - physiopathology
Chagas disease
Chronic Disease
Cruzipain
Cysteine Endopeptidases - immunology
Enzyme-Linked Immunosorbent Assay
Epitopes - blood
Epitopes - chemistry
Epitopes - immunology
Humans
Middle Aged
Protozoan Proteins
Trypanosoma cruzi
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Summary:The humoral immune response to epitopes expressed on cruzipain was evaluated in 31 Chagas disease patients (CDP) with different degrees of cardiac dysfunction. We took advantage of the availability of anti- Trypanosoma cruzi microsomal fraction monoclonal antibodies (MoAbs) reactive with epitopes that are recognized (5A9B11) or not recognized (1A10C11) by CDP sera. The 5A9B11- and 1A10C11-like epitopes are expressed on cruzipain. The reactivity of 5A9B11 against cruzipain was completely inhibited by sera of severe cardiopathy patients while a partial inhibition was found with sera from chagasic patients with mild disease. CDP sera did not block cruzipain recognition by 1A10C11. The antigenic determinants recognized by CDP sera appeared to be linear and carbohydrate free. When the overall anti-cruzipain immune response was evaluated, 70% of CDP with severe disease showed cruzipain titers higher than 1/800 while none of them displayed titers lower that 1/400. This report shows for the first time that the humoral immune response against epitopes expressed on cruzipain appeared to be related with the severity of chronic Chagas disease.
ISSN:0165-2478
1879-0542
DOI:10.1016/S0165-2478(01)00255-3