title: H2-M3-restricted memory T cells: persistence and activation without expansion.
abstract: H2-M3-restricted T cells respond more rapidly to primary Listeria monocytogenes infection than conventional MHC class Ia-restricted T cells. Reinfection with L. monocytogenes, while inducing explosive proliferation of H2-K(d)-restricted T cells, does not stimulate significant expansion of H2-M3-restricted CTL. These disparate responses to reinfection are apparent within 5 days of primary L. monocytogenes infection. However, H2-M3-restricted memory T cells are generated, and are indistinguishable from classically restricted T cells in terms of cell surface memory markers and longevity. Early responses of H2-M3- and H2-K(d)-restricted memory T cells to reinfection are similar, with increases in size and expression of activation markers. Interestingly, priming of H2-M3-restricted T cells with an L. monocytogenes-derived N-formyl peptide plus anti-CD40 generates memory T cells that expand upon re-exposure to Ag during L. monocytogenes infection. Our data indicate that disparate H2-M3- and MHC class Ia-restricted memory T cell responses reflect intrinsic differences between these T cell populations. Although distinct proliferative programs appear to be hardwired in these populations during primary L. monocytogenes infection, under different inflammatory circumstances M3-restricted T cell populations can maintain the ability to expand upon re-exposure to Ag.
authors.affiliation: Section of Immunobiology, Yale University School of Medicine, New Haven, CT 06520, USA.
authors.forename: Kristen M
authors.initials: KM
authors.lastname: Kerksiek
authors.forename: Alexander
authors.initials: A
authors.lastname: Ploss
authors.forename: Ingrid
authors.initials: I
authors.lastname: Leiner
authors.forename: Dirk H
authors.initials: DH
authors.lastname: Busch
authors.forename: Eric G
authors.initials: EG
authors.lastname: Pamer
mesh_terms: D000818:Animals; D000942:Antigens, Bacterial / Q000276:immunology; D001427:Bacterial Toxins; D015415:Biomarkers / Q000032:analysis; D002455:Cell Division / Q000235:genetics / Q000276:immunology; D002470:Cell Survival / Q000235:genetics / Q000276:immunology; D005260:Female; D006183:H-2 Antigens / Q000032:analysis; D006360:Heat-Shock Proteins / Q000276:immunology; D006460:Hemolysin Proteins; D015395:Histocompatibility Antigens Class I / Q000032:analysis / Q000276:immunology*; D007114:Immunization; D007117:Immunization, Secondary; D007156:Immunologic Memory / Q000235:genetics; D008089:Listeria monocytogenes / Q000276:immunology; D008088:Listeriosis / Q000276:immunology / Q000382:microbiology; D008213:Lymphocyte Activation / Q000235:genetics; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D010446:Peptide Fragments / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000166:cytology* / Q000276:immunology* / Q000378:metabolism / Q000382:microbiology; D013602:T-Lymphocytes, Cytotoxic / Q000166:cytology / Q000276:immunology / Q000378:metabolism / Q000382:microbiology
chemical_list: D000942:Antigens, Bacterial; D001427:Bacterial Toxins; D015415:Biomarkers; D006183:H-2 Antigens; C024755:H-2K(K) antigen; C078177:H2-M3 antigen; D006360:Heat-Shock Proteins; D006460:Hemolysin Proteins; D015395:Histocompatibility Antigens Class I; D010446:Peptide Fragments; C038705:hlyA protein, Listeria monocytogenes