Demonstration of idiotypes expressed on basophil-bound IgE antibodies by using anti-idiotype-induced histamine release in grass pollen-allergic patients.
This study was designed to analyse further the idiotypic cross-reactivity between anti-Lol p I murine monoclonal antibodies of IgG isotype and basophil-bound human IgE antibodies from grass pollen-sensitive patients. It was also designed to determine the expression frequency of the idiotypes present on cell-bound IgE. Rabbit anti-idiotypic antisera were produced against idiotypes of three anti-Lol p I monoclonal antibodies (290A-167, 539A-6 and 348A-6) of different specificities. Basophils from 19 patients reacting to Lol p I allergen, as shown by positive skin test reactions and by the presence of serum-specific IgE antibodies (measured by RAST), were challenged with these rabbit anti-idiotypic antibodies and the histamine released was measured. Our data indicate that IgE-borne idiotypes were expressed as follows: (i) co-expression of the three idiotypes in 15% of patients; (ii) co-expression of two idiotypes in 21% of patients; and (iii) expression of a unique idiotype (290A-167) in 42% of patients. Among the three idiotypes, 290A-167 was shown to be a public idiotype since it was expressed in 80% of patients. Fab fragments of anti-idiotypic antibodies could inhibit anti-idiotype-induced histamine release, but optimal conditions varied from one patient to another.
Mecheri
S
S
Unité d'Immuno-Allergie, Institut Pasteur, Paris, France.
Mourad
W
W
Lapeyre
J
J
Jobin
M
M
David
B
B
Hébert
J
J
D000328:Adult; D000911:Antibodies, Monoclonal / Q000276:immunology; D001491:Basophils / Q000276:immunology; D003429:Cross Reactions; D004306:Dose-Response Relationship, Immunologic; D006636:Histamine Release; D006801:Humans; D007073:Immunoglobulin E / Q000276:immunology*; D007140:Immunoglobulin Fab Fragments / Q000276:immunology; D007074:Immunoglobulin G / Q000276:immunology; D007130:Immunoglobulin Idiotypes / Q000276:immunology*; D008875:Middle Aged; D006255:Rhinitis, Allergic, Seasonal / Q000276:immunology*
D000911:Antibodies, Monoclonal; D007140:Immunoglobulin Fab Fragments; D007074:Immunoglobulin G; D007130:Immunoglobulin Idiotypes; D007073:Immunoglobulin E