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. 1995 Oct;63(10):3953–3958. doi: 10.1128/iai.63.10.3953-3958.1995

T-cell suppression and selective in vivo activation of TH2 subpopulation by the Entamoeba histolytica 220-kilodalton lectin.

P Talamás-Rohana 1, M A Schlie-Guzmán 1, V I Hernández-Ramírez 1, J L Rosales-Encina 1
PMCID: PMC173555  PMID: 7558304

Abstract

A 220-kDa surface protein (L220) with lectin activity from Entamoeba histolytica trophozoites has been characterized previously (J. L. Rosales-Encina, I. Meza, A. López-de-León, P. Talamás-Rohana, and M. Rojkind, J. Infect. Dis. 156:790-797, 1987). This molecule is involved in the adhesion process (I. Meza, F. Cázares, J. L. Rosales-Encina, P. Talamás-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.

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Selected References

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