Isolation and functional characterization of murine T cell lines and clones specific for the protozoan parasite Trypanosoma cruzi
| Autor: | S P Nickell, A Gebremichael, R Hoff, M H Boyer |
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| Rok vydání: | 1987 |
| Předmět: | |
| Zdroj: | The Journal of Immunology. 138:914-921 |
| ISSN: | 1550-6606 0022-1767 |
| DOI: | 10.4049/jimmunol.138.3.914 |
| Popis: | Murine T cell lines responsive to the protozoan parasite Trypanosoma cruzi were generated in vitro by stimulating hyperimmune C57BL/6 lymphoid cells with trypomastigote stage antigen. A spleen-derived line designated ST1 and eight clones derived from ST1 were characterized. All lines bear the surface phenotype Thy-1.2+, Ly-1.2+, 2.2- and respond to T. cruzi antigen only in the presence of antigen-presenting cells matched at the I-A subregion of the H2 locus. Clonal specificity analyses indicated that these T. cruzi-selected T cells are species specific and recognize antigenic determinants that are expressed predominantly in the trypomastigote stage. On the basis of their distinct patterns of response to a panel of different T. cruzi strains, clones recognizing strain-specific, shared, or common determinants were identified. Functional studies indicated that ST1 and some but not all of the clones are capable of expressing antigen-specific T helper function in vitro and in vivo. In addition, co-incubation of T. cruzi-specific T cells with cultured T. cruzi-infected syngeneic macrophages led to the dose-dependent destruction of intracellular parasites. Most notably, ST1 and several of the cloned T. cruzi-specific T cell lines were able to passively protect syngeneic recipients from lethal T. cruzi challenge infection. Efforts to identify the parasite antigens recognized by these T cell lines, particularly the protective clones, are currently in progress. |
| Databáze: | OpenAIRE |
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