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Dev Comp Immunol ; 92: 60-68, 2019 03.
Article in English | MEDLINE | ID: mdl-30308209

ABSTRACT

Using a porcine model, we describe Melanoma-Associated CD4+CD8hi T-lymphocytes (MATL) in peripheral blood that increase during melanoma regression. These MATL possess the CD4+CD8hi phenotype and they have their direct counterparts in Tumor Infiltrating Lymphocytes (TIL) isolated from melanoma loci. Both MATL and CD4+CD8hi TIL have a similar expression of selected markers indicating that they represent effector/memory αß T-cell subset. Moreover, although TIL also contain CD4-CD8+ T-cells, only CD4+CD8hi TIL expand during melanoma regression. Importantly, TIL isolated from different pigs and different melanoma loci among the same pig have similar composition of CD4/CD8 subsets, indicating that the composition of the MATL and TIL compartment is identical. Analysis of sorted cells from regressing pigs revealed a unique MATL subpopulation with mono-specific T-cell receptor that was further analyzed by sequencing. These results indicate that pigs regressing melanomas possess a characteristic population of recirculating T-cells playing a role in tumor control and regression.


Subject(s)
Lymphocytes, Tumor-Infiltrating/immunology , Melanoma/immunology , Neoplasms, Experimental/immunology , Swine/immunology , T-Lymphocytes/immunology , Animals , CD4 Antigens/metabolism , CD8 Antigens/metabolism , Cells, Cultured , Cytotoxicity, Immunologic , Disease Models, Animal , Humans , Immunophenotyping , Neoplasm Regression, Spontaneous , Receptors, Antigen, T-Cell, alpha-beta/metabolism
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