Glycoconjugates of Trypanosoma cruzi: a 74 kD antigen of trypomastigotes specifically reacts with lytic anti-alpha-galactosyl antibodies from patients with chronic Chagas disease.
J Clin Lab Anal
; 7(6): 307-16, 1993.
Article
em En
| MEDLINE
| ID: mdl-8277354
Protective, lytic antibodies are believed to be correlated with active Trypanosoma cruzi infection. In patients with chronic infection, antibodies lysing trypomastigote forms recognize chiefly alpha-galactosyl structures at the parasite surface. The target molecules on cell-derived trypomastigotes that react with anti-alpha-galactosyl antibodies (anti-Gal) from patients with chronic Chagas disease were investigated. Glycoconjugates were isolated from trypomastigotes and shown to absorb purified Chagasic (Ch) anti-Gel effectively as well as lytic antibodies from Ch sera. Active fractions were F2 (74 kD and 95.6 kD) and F3 (120-200 kD). A differential reactivity with antibodies from untreated Ch patients (trypanolytic) and from treated, presumably cured, individuals (not trypanolytic) was evident using F2 and F3 antigenic fractions. No cross-reactivity with heterologous sera (other infections) was observed. The F2 glycoconjugate (mostly 74 kD) can be used in the diagnosis of active Chagas infection, replacing the quantitative determination of complement-mediated lysis. With the present sample of patients' sera and normal human sera, it showed 100% sensitivity and specificity.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Trypanosoma cruzi
/
Anticorpos Antiprotozoários
/
Doença de Chagas
/
Antígenos de Protozoários
Limite:
Animals
/
Humans
Idioma:
En
Revista:
J Clin Lab Anal
Assunto da revista:
TECNICAS E PROCEDIMENTOS DE LABORATORIO
Ano de publicação:
1993
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Estados Unidos