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M9650377.TXT
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1996-03-09
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Document 0377
DOCN M9650377
TI Chagasic patients lack CD28 expression on many of their circulating T
lymphocytes.
DT 9605
AU Dutra WO; Martins-Filho OA; Cancado JR; Pinto-Dias JC; Brener Z;
Gazzinelli G; Carvalho JF; Colley DG; Centro de Pesquisas Rene Rachou,
FIOCRUZ, Belo Horizonte,; Brazil.
SO Scand J Immunol. 1996 Jan;43(1):88-93. Unique Identifier : AIDSLINE
MED/96151206
AB A balanced host-parasite interaction during Trypanosoma cruzi infection
allows for the establishment of a chronic infection that can last for
many years. T cells are a major element responsible for parasite
specific and non-specific immunity during the complex immune response of
the host. However, the subpopulations of T cells involved in the
response, as well as the exact mechanisms through which those cells are
activated or rendered unresponsive, are not well defined. It is known
that co-stimulatory signals, some of which are mediated via CD28, are of
critical importance in the triggering of appropriate T cell responses.
In this study the authors performed double-labelling studies to
determine the frequency of expression of CD28 by CD4+ and CD8+ T
lymphocytes in the peripheral blood of patients with Chagas' disease.
The results show that chagasic patients throughout the spectrum of
chronic clinical forms of the infection have significantly higher mean
frequencies of CD4+CD28- and CD8+CD28-T cells, as compared with
non-chagasic individuals. Considering the importance of CD28 for T-cell
activation, the observed down-regulation or loss of CD28 during
infection may indicate a possible basis for observed immunoregulatory
events or distinct stages of T-cell activation in this infection. Recent
evidence from patients with HIV/AIDS indicates that CD28- cell
populations are more likely to undergo apoptosis, and increased
apoptosis has been observed in experimental Chagas disease.
DE Adult Aged Aged, 80 and over Antibodies, Monoclonal Antigens,
CD28/*BIOSYNTHESIS Chagas Disease/*IMMUNOLOGY CD4-Positive
T-Lymphocytes/*IMMUNOLOGY CD8-Positive T-Lymphocytes/*IMMUNOLOGY Flow
Cytometry Human Lymphocyte Transformation Middle Age Support,
Non-U.S. Gov't Support, U.S. Gov't, P.H.S. JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).