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Document 0473
DOCN M9610473
TI T-cell suppression and selective in vivo activation of TH2 subpopulation
by the Entamoeba histolytica 220-kilodalton lectin.
DT 9601
AU Talamas-Rohana P; Schlie-Guzman MA; Hernandez-Ramirez VI; Rosales-Encina
JL; Department of Experimental Pathology, Centro de Investigacion y; de
Estudios Avanzados del Instituto Politecnico Nacional, Mexico; City,
Mexico.
SO Infect Immun. 1995 Oct;63(10):3953-8. Unique Identifier : AIDSLINE
MED/96009751
AB A 220-kDa surface protein (L220) with lectin activity from Entamoeba
histolytica trophozoites has been characterized previously (J. L.
Rosales-Encina, I. Meza, A. Lopez-de-Leon, P. Talamas-Rohana, and M.
Rojkind, J. Infect. Dis. 156:790-797, 1987). This molecule is involved
in the adhesion process (I. Meza, F. Cazares, J. L. Rosales-Encina, P.
Talamas-Rohana, and M. Rojkind, J. Infect. Dis. 156:798-805, 1987) and
is very immunogenic. In this work, we studied both the humoral and the
cellular immune responses to L220. We compared L220 with L220-derived
components, such as a fusion peptide (M-11) and chemically obtained
peptides (by treating the 220-kDa molecule with
N-chlorosuccinimide-urea). Spleen cells from L220-immunized mice were
unable to proliferate in vitro when stimulated with the protein.
However, a proliferative response was obtained when mice were immunized
with the L220-derived fusion peptide or the cleaved lectin. To find out
if there was a correlation between the observed responses and TH1 or TH2
activation, we analyzed patterns of cytokine secretion (interleukin-2
[IL-2], IL-4, IL-10, and gamma interferon). Cells from mice immunized
with peptides that induced cell proliferation (100, 80, and 47 kDa) with
the peptides (P < 0.01) and with the intact molecule secreted IL-2 and
gamma interferon, showing a TH1-subset pattern. Conversely, cells from
mice immunized with the intact 220-kDa molecule secreted IL-4 and IL-10,
typical of a TH2 subpopulation; however, antibodies from each group
recognized the 220-kDa molecule as determined by Western blotting
(immunoblotting). These results suggest that various epitopes in the
220-kDa molecule generate different response patterns, suppressing or
activating T-cell responses.
DE Animal Cytokines/BIOSYNTHESIS Entamoeba histolytica/*IMMUNOLOGY
Immunization Lectins/*IMMUNOLOGY *Lymphocyte Transformation Mice
Mice, Inbred BALB C Molecular Weight Protozoan Proteins/*IMMUNOLOGY
Support, Non-U.S. Gov't Th1 Cells/IMMUNOLOGY Th2 Cells/*IMMUNOLOGY
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).