Human anti-FcepsilonRIalpha autoantibodies isolated from healthy donors cross-react with tetanus toxoid.
Eur J Immunol
; 29(4): 1139-48, 1999 04.
Article
em En
| MEDLINE
| ID: mdl-10229080
ABSTRACT
Natural antibodies (Ab) reacting with self antigens have been shown to be present in all individuals. These autoantibodies (auto-Ab) can be either pathogenic or non-pathogenic. Auto-Ab reacting with the alpha-subunit of the high-affinity receptor for IgE (FcepsilonRIalpha) have been implicated in the pathogenesis of a subset of patients with chronic idiopathic urticaria (CIU). Intravenous immunoglobulin (IVIg) preparations have been used with variable clinical benefit in the treatment of these patients. Here we show that anti-FcepsilonRIalpha auto-Ab are present in a therapeutic IVIg preparation as well as in atopic and chronic urticaria patients and healthy individuals. We affinity-purified the anti-FcepsilonRIalpha Ab from an IVIg preparation using recombinant FcepsilonRIalpha. Interestingly, these anti-FcepsilonRIalpha auto-Ab showed no evidence of histamine release but strongly cross-reacted with an external antigen, tetanus toxoid (TTd) with a higher affinity for TTd than for the FcepsilonRIalpha. Since the cross-reacting Ab are non-anaphylactogenic, there is no evidence that TTd immunization may contribute to the pathogenesis of CIU. However, our results may indicate that the anti-FcepsilonRIalpha auto-Ab belong to the natural Ab and serve as the parental Ab for some anti-TTd Ab.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Autoanticorpos
/
Toxoide Tetânico
/
Receptores de IgE
Limite:
Animals
/
Humans
/
Newborn
Idioma:
En
Revista:
Eur J Immunol
Ano de publicação:
1999
Tipo de documento:
Article
País de afiliação:
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