title: Anergic T cells inhibit the antigen-presenting function of dendritic cells.
abstract: The phenomena of infectious tolerance and linked-suppression are well established, but the mechanisms involved are incompletely defined. Anergic T cells can inhibit responsive T cells in vitro and prolong skin allograft survival in vivo. In this study the mechanisms underlying these events were explored. Allospecific mouse T cell clones rendered unresponsive in vitro inhibited proliferation by responsive T cells specific for the same alloantigens. The inhibition required the presence of APC, in that the response to coimmobilized anti-CD3 and anti-CD28 Abs was not inhibited. Coculture of anergic T cells with bone marrow-derived dendritic cells (DC) led to profound inhibition of the ability of the DC to stimulate T cells with the same or a different specificity. After coculture with anergic T cells expression of MHC class II, CD80 and CD86 by DC were down-regulated. These effects did not appear to be due to a soluble factor in that inhibition was not seen in Transwell experiments, and was not reversed by addition of neutralizing anti-IL-4, anti-IL-10, and anti-TGF-beta Abs. Taken together, these data suggest that anergic T cells function as suppressor cells by inhibiting Ag presentation by DC via a cell contact-dependent mechanism.
authors.affiliation: Department of Immunology, Imperial College School of Medicine, and Medical Research Council Clinical Sciences Centre, Imperial College School of Medicine, Hammersmith Hospital, London, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Vendetti
authors.forename: J G
authors.initials: JG
authors.lastname: Chai
authors.forename: J
authors.initials: J
authors.lastname: Dyson
authors.forename: E
authors.initials: E
authors.lastname: Simpson
authors.forename: G
authors.initials: G
authors.lastname: Lombardi
authors.forename: R
authors.initials: R
authors.lastname: Lechler
mesh_terms: D000818:Animals; D017951:Antigen Presentation / Q000276:immunology*; D015703:Antigens, CD / Q000096:biosynthesis; D017209:Apoptosis / Q000276:immunology; D018122:B7-1 Antigen / Q000096:biosynthesis; D051940:B7-2 Antigen; D019013:CD40 Antigens / Q000378:metabolism; D023201:CD40 Ligand; D002450:Cell Communication / Q000276:immunology; D017635:Clonal Anergy / Q000276:immunology*; D002999:Clone Cells; D018920:Coculture Techniques; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D015536:Down-Regulation / Q000276:immunology; D000949:Histocompatibility Antigens Class II / Q000096:biosynthesis; D008024:Ligands; D008213:Lymphocyte Activation / Q000276:immunology; D008297:Male; D008562:Membrane Glycoproteins / Q000096:biosynthesis; D051379:Mice; D008810:Mice, Inbred C57BL; D016688:Mice, Inbred NOD; D008822:Mice, Transgenic; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D015703:Antigens, CD; D018122:B7-1 Antigen; D051940:B7-2 Antigen; D019013:CD40 Antigens; C497965:Cd86 protein, mouse; D000949:Histocompatibility Antigens Class II; D008024:Ligands; D008562:Membrane Glycoproteins; D023201:CD40 Ligand