NK1.1+ cells and T-cell activation in euthymic and thymectomized C57Bl/6 mice during acute Trypanosoma cruzi infection.

NK1.1+ cells and T-cell activation in euthymic and thymectomized C57Bl/6 mice during acute Trypanosoma cruzi infection. Research Abstract Details 

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NK1.1+ cells and T-cell activation in euthymic and thymectomized C57Bl/6 mice during acute Trypanosoma cruzi infection. Abstract Text:

Natural killer (NK) cells may provide the basis for resistance to Trypanosoma cruzi infection, because the depletion of NK1.1 cells causes high levels of parasitemia in young C57Bl/6 mice infected with T. cruzi. Indeed, NK1.1 cells have been implicated in the early production of large amounts of interferon (IFN)-gamma, an important cytokine in host resistance. The NK1.1 marker is also expressed on special subpopulations of T cells. Most NK1.1+ T cells are of thymic origin, and their constant generation may be prevented by thymectomy. This procedure, by itself, decreased parasitemia and increased resistance in young mice. However, the depletion of NK1.1+ cells by the chronic administration of a monoclonal antibody (MoAb) (PK-136) did not increase the parasitemia or mortality in thymectomized C57Bl/6 mice infected with T. cruzi (Tulahuen strain). To study the cross-talk between NK1.1+ cells and conventional T cells in this model, we examined the expression of activation/memory markers (CD45RB) on splenic CD4+ and CD8+ T cells from young euthymic or thymectomized mice with or without depletion of NK1.1+ cells and also in aged mice during acute infection. Resistance to infection correlated with the amount of CD4+ T cells that are already activated at the moment of infection, as judged by the number of splenic CD4+ T cells expressing CD45RB(-). In addition, the specific antibody response to T. cruzi antigens was precocious and an accumulation of immunoglobulin (Ig)M with little isotype switch occurred in euthymic mice depleted of NK1.1+ cells. The data presented here suggest that NK1.1+ cells have important regulatory functions in euthymic, but not in thymectomized mice infected with T. cruzi. These regulatory functions include a helper activity in the generation of effector or activated/memory T cells.

NK1.1+ cells and T-cell activation in euthymic and thymectomized C57Bl/6 mice during acute Trypanosoma cruzi infection. Publishing Authors By Initials

For similar animals: invertebrates: protozoa: sarcomastigophora: mastigophora: zoomastigophora: kinetoplastida: trypanosomatina: trypanosoma: trypanosoma cruzi research abstracts see: animals: invertebrates: protozoa: sarcomastigophora: mastigophora: zoomastigophora: kinetoplastida: trypanosomatina: trypanosoma: trypanosoma cruzi research

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NK1.1+ cells and T-cell activation in euthymic and thymectomized C57Bl/6 mice during acute Trypanosoma cruzi infection. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Scandinavian journal of immunology

VOLUME: 55

Page Numbers: 96-104

Journal Abbreviation: Scand. J. Immunol.

ISSN: 0300-9475

DAY: 5

MONTH: Jan

YEAR: 2002

NK1.1+ cells and T-cell activation in euthymic and thymectomized C57Bl/6 mice during acute Trypanosoma cruzi infection. Information

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LANGUAGE: eng

NlmUniqueID: 323767

NK1.1+ cells and T-cell activation in euthymic and thymectomized C57Bl/6 mice during acute Trypanosoma cruzi infection. Keywords Mesh Terms:

KEYWORDS: Trypanosoma cruzi

MESH TERMS: immunology

Chemical & Substance for Abstract: NK1.1+ cells and T-cell activation in euthymic and thymectomized C57Bl/6 mice during acute Trypanosoma cruzi infection. Information

Substance Name: Killer Cell Lectin-Like Receptor Subfami

Registry Number: 145113-62-8

Grant and Affiliation Information for NK1.1+ cells and T-cell activation in euthymic and thymectomized C57Bl/6 mice during acute Trypanosoma cruzi infection.

AFFILIATION: Department of Immunology, Institute for Biomedical Sciences-IV, University of São Paulo, 05508-900 USP, São Paulo, SP, Brazil. fcardilo@usp.br

Country: England

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MEDLINETA: Scand J Immunol

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