Interruption of recently induced immune responses by oral administration of antigen.
Braz J Med Biol Res
; 31(3): 377-80, 1998 Mar.
Article
en En
| MEDLINE
| ID: mdl-9698786
ABSTRACT
Interest in oral tolerance has been renewed in the last few years as a possibility of intervention in human autoimmune diseases. An obstacle in this direction is that, although easily induced in animals virgin of contact with the antigen, oral tolerance becomes hard to induce in previously immunized animals. The present results show that there is an early period after primary immunization in which prolonged oral exposure to the antigen may arrest ongoing immune responses. Beyond this period, oral exposures to the antigen become ineffective and may actually boost immune responses. The end of the susceptible period coincides with the emergence of free specific antibodies in serum. However, the previous administration of purified anti-ovalbumin antibodies (40 micrograms) was unable to block the induction of oral tolerance to ovalbumin in normal mice.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Enfermedades Autoinmunes
/
Desensibilización Inmunológica
/
Formación de Anticuerpos
/
Antígenos
Límite:
Animals
Idioma:
En
Revista:
Braz J Med Biol Res
Año:
1998
Tipo del documento:
Article
País de afiliación:
Brasil