Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9266346 | Immunology Letters | 2005 | 9 Pages |
Abstract
Allergen-specific IgE and IgG antibodies coexist in allergic individuals, but only IgE has anaphylactogenic capacity. This study aimed to determine the association, dissociation and equilibrium constants for the interaction of allergen-specific IgE and IgG with the major grass and birch pollen allergens Phl p 5a and Bet v 1a. We isolated specific IgE and IgG antibodies from pollen allergic patients' sera by a two-step affinity chromatography protocol and controlled the high purity in a recombinant allergen chip microarray. Surface plasmon resonance measurements of polyclonal IgE and IgG species revealed that their affinities diverge widely, being in the range of 10â10 and 10â11Â M for IgE, but only 10â6-10â7Â M for IgG. Moreover, murine monoclonal IgG1 antibodies against the allergens showed affinities of 10â7-10â8Â M. Thus, we conclude from our data that even stringently affinity matured IgG cannot score the superior affinity of IgE antibodies to allergens.
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Immunology
Authors
Brigitte Hantusch, Isabella Schöll, Christian Harwanegg, Sigurd Krieger, Wolf-Meinhard Becker, Susanne Spitzauer, George Boltz-Nitulescu, Erika Jensen-Jarolim,