title: MHC class II (I-A) region control of the IgE antibody repertoire to the ABA-1 allergen of the nematode Ascaris.
abstract: ABA-1 is an approximately 14,000 molecular weight (MW) allergen which is among the most abundant proteins synthesized by the nematode parasite Ascaris. IgG and IgE responses to it are major histocompatibility complex (MHC)-restricted in rodents and have only been found to occur in rats of the RT1u haplotype and mice of the H-2s haplotype. Humans infected with the parasite vary substantially in their immune response to the allergen, but the genetic basis for this unknown. H-2 recombinant mice were used to identify the region within the MHC controlling antibody responses to the allergen. IgG antibody to immunoaffinity purified ABA-1 was assayed by radio-immunoassay and IgE by passive cutaneous anaphylaxis. This showed that the restriction element is the I-A molecule and that there was some evidence for I-E modulation of the level of response.
authors.affiliation: Wellcome Laboratories for Experimental Parasitology, University of Glasgow, U.K.
authors.forename: M W
authors.initials: MW
authors.lastname: Kennedy
authors.forename: E M
authors.initials: EM
authors.lastname: Fraser
authors.forename: J F
authors.initials: JF
authors.lastname: Christie
mesh_terms: D000485:Allergens / Q000276:immunology*; D000818:Animals; D000909:Antibodies, Helminth / Q000096:biosynthesis*; D000947:Antigens, Helminth / Q000276:immunology; D001200:Ascaris / Q000276:immunology*; D006183:H-2 Antigens / Q000235:genetics; D006239:Haplotypes / Q000276:immunology; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D007073:Immunoglobulin E / Q000096:biosynthesis*; D007074:Immunoglobulin G / Q000096:biosynthesis; D051379:Mice; D008815:Mice, Inbred Strains
chemical_list: D000485:Allergens; D000909:Antibodies, Helminth; D000947:Antigens, Helminth; D006183:H-2 Antigens; D000949:Histocompatibility Antigens Class II; D007074:Immunoglobulin G; D007073:Immunoglobulin E