title: Self-specific CD8+ T cells maintain a semi-naive state following lymphopenia-induced proliferation.
abstract: Upon transfer into T cell-deficient hosts, naive CD8(+) T cells typically undergo lymphopenia-induced proliferation (LIP, also called homeostatic proliferation) and develop the phenotypic and functional characteristics of memory CD8(+) T cells. However, the capacity of T cells with self-peptide/MHC specificity to respond in this way has not been intensively studied. We examined pmel-1 TCR transgenic CD8(+) T cells that are specific for an epitope from gp100, a protein expressed by melanoma cells and normal melanocytes. Despite their self-specificity, naive pmel-1 cells were inefficient at LIP in typical lymphopenic hosts. In CD132 (common gamma-chain)-deficient hosts, pmel-1 CD8(+) T cells underwent extensive proliferation, but, surprisingly, the majority of these cells retained certain naive phenotypic traits (CD44(low), CD122(low)) rather than acquiring the expected central-memory phenotype. Following LIP, pmel-1 T cells acquired the capacity to control B16F10 tumor growth, but only in common gamma-chain-deficient host mice. Together, these data suggest that LIP does not always favor expansion of self-specific CD8 T cells and that sustained extensive lymphopenia is required for such cells to exhibit tumor control.
authors.affiliation: Department of Laboratory Medicine and Pathology, Center for Immunology, University of Minnesota, Minneapolis, MN 55414, USA.
authors.forename: Lisa D S
authors.initials: LD
authors.lastname: Johnson
authors.forename: Stephen C
authors.initials: SC
authors.lastname: Jameson
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism / Q000473:pathology*; D002453:Cell Cycle / Q000276:immunology*; D002454:Cell Differentiation / Q000235:genetics / Q000276:immunology; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D002999:Clone Cells; D018984:Epitopes, T-Lymphocyte / Q000276:immunology*; D007108:Immune Tolerance; D007156:Immunologic Memory / Q000235:genetics; D016130:Immunophenotyping; D016246:Lymphocytes, Tumor-Infiltrating / Q000276:immunology / Q000473:pathology; D008231:Lymphopenia / Q000235:genetics / Q000276:immunology* / Q000473:pathology*; D008546:Melanoma, Experimental / Q000276:immunology / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008822:Mice, Transgenic
chemical_list: D018984:Epitopes, T-Lymphocyte
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