Interruption of recently induced immune responses by oral administration of antigen
| Autor: | A.A. Conde, B. Stransky, A.M.C. Faria, N.M. Vaz |
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| Jazyk: | angličtina |
| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Brazilian Journal of Medical and Biological Research, Vol 31, Iss 3, p 377 (1998) |
| Druh dokumentu: | article |
| ISSN: | 0100-879X 1414-431X |
| DOI: | 10.1590/S0100-879X1998000300008 |
| Popis: | 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 µg) was unable to block the induction of oral tolerance to ovalbumin in normal mice |
| Databáze: | Directory of Open Access Journals |
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