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M9550108.TXT
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1995-03-04
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Document 0108
DOCN M9550108
TI Nonallergic individuals recognize the same T cell epitopes of Bet v 1,
the major birch pollen allergen, as atopic patients.
DT 9505
AU Ebner C; Schenk S; Najafian N; Siemann U; Steiner R; Fischer GW;
Hoffmann K; Szepfalusi Z; Scheiner O; Kraft D; Institute of General and
Experimental Pathology, University of; Vienna, Austria.
SO J Immunol. 1995 Feb 15;154(4):1932-40. Unique Identifier : AIDSLINE
MED/95138538
AB The immune response toward allergens in nonallergic healthy individuals
was investigated. To boost immune responses, two injections of birch
pollen extract were administered to five nonallergic volunteers. T cell
lines (TCL) with specificity for Bet v 1, the major birch pollen
allergen, were established and analyzed for epitope specificity using
overlapping peptides. Forty-nine T cell clones (TCC) specific for Bet v
1 were isolated from TCLs. Comparison with TCL and TCC established from
birch pollen-allergic patients was performed. All TCC revealed the Th
phenotype. Epitope specificities of TCL and TCC from nonatopics were
identical to those found in allergic individuals. No association between
MHC class II molecules and particular epitopes could be observed. In
nonallergic as well as in allergic individuals, cytokine production in
response to specific stimulation revealed a majority of Th-clones
producing IL-4 and IFN-gamma. However, TCC derived from atopic
individuals revealed a higher IL-4/IFN-gamma ratio. Immunoblot and ELISA
revealed Bet v 1-specific IgG in nonallergic individuals before and
after booster injections, but no IgE could be detected. High levels of
Bet v 1-specific IgG and IgE could be detected in birch pollen-allergic
patients. It can be concluded, that nonatopic and allergic individuals
display the same repertoire of T cell specificities. In allergic
individuals, the activation of allergen-specific TCC leads to a higher
ratio of produced IL-4 vs IFN-gamma, which is responsible for enhanced
IgE production.
DE Allergens/*IMMUNOLOGY Amino Acid Sequence Antigenic
Determinants/*IMMUNOLOGY Cell Line Clone Cells Hay Fever/*IMMUNOLOGY
Human Hypersensitivity, Immediate/*IMMUNOLOGY HLA-D Antigens/ANALYSIS
IgE/BIOSYNTHESIS/IMMUNOLOGY IgG/BIOSYNTHESIS/IMMUNOLOGY Interferon
Type II/BIOSYNTHESIS Interleukin-4/BIOSYNTHESIS Intradermal Tests
Lymphocyte Transformation Molecular Sequence Data Peptide
Fragments/CHEMISTRY/IMMUNOLOGY Plant Proteins/*IMMUNOLOGY Reference
Values Support, Non-U.S. Gov't T-Lymphocyte Subsets/*IMMUNOLOGY Th2
Cells/IMMUNOLOGY/METABOLISM Trees JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).