title: Renaissance for hapten-specific T lymphocytes: implications for basic and applied research.
abstract: Protein-reactive chemicals and drugs (haptens), such as dinitro- (DNP) or trinitro-phenylated (TNP) reagents or penicillins, are potent inducers of allergic reactions in experimental animal systems as well as in humans. Hapten-specific T lymphocytes are mediators of these disorders. Like other antigens, hapten determinants on target cells are recognized by the T cell's antigen-specific receptors exclusively in association with gene products of the major histocompatibility complex (MHC). Until recently, the nature of the complex hapten/MHC determinants remained unknown. Atypically, this fact, rather than spurring scientific investigations, caused a rapid loss of interest in haptens as T cell antigens by the majority of immunologists. This situation may now be changing, since we have recently identified MHC-binding, hapten-modified peptides which mediate cellular recognition by T cells via their antigen-specific receptors. Synthetic hapten-peptide conjugates open up new routes in studying the molecular details of hapten recognition by T cells. They may also contribute to a better understanding of what defines an antigen as an allergy-inducing "allergen".
authors.affiliation: Max-Planck-Institut für Immunobiologie, Freiburg.
authors.forename: H U
authors.initials: HU
authors.lastname: Welzien
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D006241:Haptens; D008969:Molecular Sequence Data; D010047:Ovalbumin / Q000276:immunology; D017385:Sequence Homology; D012709:Serum Albumin / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D006241:Haptens; D012709:Serum Albumin; D010047:Ovalbumin