title: Feedback activation of T-cell antigen-presenting cells during interactions with T-cell responders.
abstract: Like many T cells in the myelin basic protein (MBP)-specific T-cell repertoire, CD4(-) GP2.3H3.16 (3H3) T cells recognize guinea pig MBP as an agonist but recognize autologous rat (R)MBP as a mixed agonist/antagonist. 3H3 T cells do not exhibit proliferative responses to RMBP but nonetheless respond to RMBP by accumulation of T-cell surface I-A/peptide complexes and generation of T-cell antigen-presenting cell (T-APC) activity. This study showed that presentation of RMBP by 3H3 T-APC is long-lived but is lost during interactions with cognate responders or on overt activation of T-APCs. Presentation of RMBP to encephalitogenic T cells resulted in the reciprocal activation of 3H3 T-APCs as evidenced by blastogenesis, proliferation, and induction of interleukin-2R and OX40 markers on 3H3 T-APC. These data indicate that T-APCs, like B-cell APCs, undergo clonal expansion after presentation of a cognate antigen to T-cell responders.
authors.affiliation: Department of Microbiology and Immunology, East Carolina University School of Medicine, Greenville, NC 27858-4354, USA. manniem@mail.ecu.edu
authors.forename: M D
authors.initials: MD
authors.lastname: Mannie
authors.forename: M R
authors.initials: MR
authors.lastname: Walker
mesh_terms: D000818:Animals; D017951:Antigen Presentation; D000938:Antigen-Presenting Cells / Q000276:immunology*; D002450:Cell Communication; D002460:Cell Line; D018920:Coculture Techniques; D005246:Feedback; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D007376:Interleukin-2 / Q000096:biosynthesis / Q000276:immunology; D008213:Lymphocyte Activation / Q000276:immunology*; D004676:Myelin Basic Protein / Q000276:immunology; D009569:Nitric Oxide / Q000096:biosynthesis / Q000276:immunology; D051381:Rats; D011917:Rats, Inbred Lew; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000949:Histocompatibility Antigens Class II; D007376:Interleukin-2; D004676:Myelin Basic Protein; D009569:Nitric Oxide