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M9480193.TXT
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1994-08-09
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Document 0193
DOCN M9480193
TI Activated T and B lymphocytes in peripheral blood of patients with
Chagas' disease.
DT 9410
AU Dutra WO; Martins-Filho OA; Cancado JR; Pinto-Dias JC; Brener Z; Freeman
Junior GL; Colley DG; Gazzinelli G; Parra JC; Centro de Pesquisas Rene
Rachou, FIOCRUZ, Belo Horizonte,; Brazil.
SO Int Immunol. 1994 Apr;6(4):499-506. Unique Identifier : AIDSLINE
MED/94289330
AB Whole blood preparations from patients with either the indeterminate
(asymptomatic) or cardiac clinical forms of chronic Trypanosoma cruzi
infection were analyzed by flow cytometry using double-labeling to
identify subsets of circulating lymphocytes. Several significant
differences were demonstrated between the blood lymphocyte profiles of
chagasic patients and non-chagasic controls. Clear increase in the
percentages and actual numbers of double-positive cells of the phenotype
CD3+/HLA-DR+, as well as decrease in the percentage of CD45RA+/CD4+ and
CD45RA+/CD8+ T cells, indicate greater numbers of activated T cells
circulating in the blood of infected patients. Consistent parallel
increases were seen also in the B lymphocyte subset which stained
double-positive for CD19/CD5. There were no significant differences in
the circulation of these chronic chagasic patients in the CD4:CD8
ratios. Also, no substantive phenotypic differences were observed in the
lymphocyte populations between the two ends of the clinical spectrum
(indeterminate versus cardiac) in chronic human Chagas' disease. These
observations demonstrate that increased levels of activated T cells and
CD5+ B cells are present in the circulation of people with chronic
Chagas' disease. These are cell phenotypes that have been associated in
other conditions with autoimmune, polyclonal, and hyperimmune responses.
The specificities of these activated cells and the roles they may play
in resistance or pathogenesis during chronic Chagas' disease need now to
be determined.
DE Adult Aged Aged, 80 and over Antigens, CD/BLOOD B-Lymphocyte
Subsets/*IMMUNOLOGY Chagas Disease/*IMMUNOLOGY Chronic Disease
CD4-CD8 Ratio Flow Cytometry Fluorescent Antibody Technique Human
HLA-DR Antigens/IMMUNOLOGY Lymphocyte Transformation/*PHYSIOLOGY
Middle Age Support, Non-U.S. Gov't Support, U.S. Gov't, Non-P.H.S.
Support, U.S. Gov't, P.H.S. T-Lymphocyte Subsets/*IMMUNOLOGY JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).