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001-es BibID:BIBFORM065568
Első szerző:Rajnavölgyi Éva (immunológus)
Cím:A repetitive sequence of Epstein-Barr virus nuclear antigen 6 comprises overlapping T cell epitopes which induce HLA-DR-restricted CD4+ T lymphocytes / Éva Rajnavölgyi, Noémi Nagy, Britt Thuresson, Zsuzsa Dosztányi, Ágnes Simon, István Simon, Robert W. Karr, Ingemar Ernberg, Eva Klein, Kerstin I. Falk
Dátum:2000
ISSN:1460-2377
Megjegyzések:Most human adults carry the Epstein-Barr virus (EBV) and develop immunological memory against the structural and the virus-encoded cellular proteins. The EBV nuclear antigen 6 (EBNA6) elicits cytotoxic T cell responses and it also maintains a persistent antibody response. The majority of sera from EBV-seropositive individuals reacts with a synthetic peptide, p63, comprising 21 amino acids of a repetitive region of EBNA6. CD4(+) T lymphocytes, with specificity for p63, could be recalled from the T cell repertoire of EBV carriers that expressed certain HLA-DR allotypes which were identified as good binders of p63 by an in vitro flow cytometric assay. Analysis of the HLA-DR/p63 interaction by molecular mechanics calculations indicated the presence of multiple overlapping epitopes which were predicted to bind in a HLA-DRB1 allo- and subtype-specific manner. Specific activation of p63-selected long-term CD4(+) T cell cultures resulted in a proliferative response, in the production of IL-2 and in the secretion of high levels of tumor necrosis factor as measured by bioassays. Proliferation and cytokine production of p63-specific T cells could be induced by p63-loaded HLA-DR-matched antigen-presenting cells and by B cells co-expressing relevant HLA-DR molecules and EBNA6. Our results show that peptides of an EBNA6 repeat region induce CD4(+) T cells which can react with EBNA6-carrying cells in many individuals. We suggest that these T(h) cells may be important in conditioning dendritic cells for initiation potent virus-specific immune responses, provide help for EBV-specific B cells, drive IgG isotype switch and support the sustained effector function of memory cytotoxic T lymphocytes.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
human CD4+ T lymphocyte
HLA-DR-peptide interaction
virus-specific interactions
Megjelenés:International Immunology. - 12 : 3 (2000), p. 281-293. -
További szerzők:Nagy Noémi, M. (1960-) (vegyész, angol szakfordító) Thuresson, Britt Dosztányi Zsuzsanna Simon Ágnes (1969-) (laboratóriumi szakorvos) Simon István Karr, Robert W. Ernberg, Ingemar Klein Éva Falk, Kerstin I.
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