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Titolo:
INDUCTION OF ANERGY IN HUMAN T-HELPER 0-CELL BY STIMULATION WITH ALTERED T-CELL ANTIGEN RECEPTOR LIGANDS
Autore:
TSITOURA DC; HOLTER W; CERWENKA A; GELDER CM; LAMB JR;
Indirizzi:
UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,DEPT BIOL,INFECT & IMMUN SECT,PRINCE CONSORT RD LONDON SW7 2BB ENGLAND UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,DEPT BIOL,INFECT & IMMUN SECT LONDON SW7 2BB ENGLAND ST ANNA CHILDRENS HOSP,CHILDRENS CANC RES INST VIENNA AUSTRIA
Titolo Testata:
The Journal of immunology
fascicolo: 8, volume: 156, anno: 1996,
pagine: 2801 - 2808
SICI:
0022-1767(1996)156:8<2801:IOAIHT>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
CLASS-II COMPLEXES; INFLUENZA HEMAGGLUTININ; LYMPHOCYTES-T; TH2 CLONES; PEPTIDES; UNRESPONSIVENESS; RECOGNITION; SECRETION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
D.C. Tsitoura et al., "INDUCTION OF ANERGY IN HUMAN T-HELPER 0-CELL BY STIMULATION WITH ALTERED T-CELL ANTIGEN RECEPTOR LIGANDS", The Journal of immunology, 156(8), 1996, pp. 2801-2808

Abstract

CD4(+) T cells may become profoundly unresponsive to antigenic restimulation following ligation of TCR by immunogenic peptides bound to MHCclass II molecules in the absence of costimulation. Furthermore, it has been reported that anergy can be induced as a consequence of engagement of TCR by analogues of antigenic peptides presented by live APCs. In this study, based on resolution of the crystal structure of an influenza virus hemagglutinin (HA) peptide (HA 306-318) bound to HLA-DRB10101, we investigated the potential of analogues with amino acid substitutions at those positions predicted to form interactions with TCR to differentially activate and/or anergize HA-specific human Th0 cells restricted by DR1 class II molecules. For some analogues altering the affinity of peptide/TCR interactions revealed a direct positive correlation between antigenicity and their ability to induce anergy. Nevertheless, certain HA peptide analogues functioned as partial agonists, which although they failed to stimulate clonal expansion, were capable of rendering the Th0 cells unresponsive to immunogenic rechallenge. Furthermore, differences were noticed in the characteristics of the anergic phenotype induced by selected analogues, Restimulation with the native peptide of Th0 cells pre-exposed to the HA analogues in the absence of costimulatory signals failed to uncouple IL-4 and IFN-gamma secretion; however, in some instances, dissociation of proliferation from cytokine production was observed. The ability to differentially signal T cells through changing the affinity of peptide/TCR interactions may have implications in the potential use of altered TCR ligands in immunotherapy.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 08:25:18