title: Aging affects oral tolerance induction but not its maintenance in mice.
abstract: B6D2F1 mice, which are very susceptible to tolerance induction by a single gavage with 20 mg of ovalbumin (Ova) at age 8 weeks, become less susceptible at age 25 weeks and totally refractory at age 70 weeks. However, 70-week-old mice may be rendered tolerant by repeated ingestion of Ova. Mice orally exposed to Ova at age 8 weeks remain tolerant at age 70 weeks. The isotypic pattern of anti-Ova antibodies formed by orally-tolerant and normal mice after immunization is similar and all isotypes are equally suppressed by oral tolerance. In old mice, oral exposures to Ova alone triggered an early transient antibody response; some of these responding animals were, nevertheless, tolerant to subsequent parenteral injection of Ova in adjuvant.
authors.affiliation: Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte MG, Brazil. afaria@mono.icb.ufmg.br
authors.forename: A M
authors.initials: AM
authors.lastname: de Faria
authors.forename: S M
authors.initials: SM
authors.lastname: Ficker
authors.forename: E
authors.initials: E
authors.lastname: Speziali
authors.forename: J S
authors.initials: JS
authors.lastname: Menezes
authors.forename: B
authors.initials: B
authors.lastname: Stransky
authors.forename: V
authors.initials: V
authors.lastname: Silva Rodrigues
authors.forename: N M
authors.initials: NM
authors.lastname: Vaz
mesh_terms: D000284:Administration, Oral; D000375:Aging / Q000276:immunology* / Q000502:physiology; D000536:Aluminum Hydroxide / Q000008:administration & dosage / Q000276:immunology; D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000097:blood / Q000187:drug effects; D000917:Antibody Formation / Q000187:drug effects / Q000502:physiology*; D000941:Antigens / Q000008:administration & dosage; D005260:Female; D007108:Immune Tolerance / Q000187:drug effects / Q000502:physiology*; D007114:Immunization / Q000379:methods; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D010047:Ovalbumin / Q000008:administration & dosage / Q000276:immunology*; D015842:Serine Proteinase Inhibitors / Q000008:administration & dosage / Q000276:immunology*
chemical_list: D000888:Antibodies, Anti-Idiotypic; D000941:Antigens; D015842:Serine Proteinase Inhibitors; C049937:anti-IgA; C048844:anti-IgG; C044203:anti-IgM; D000536:Aluminum Hydroxide; D010047:Ovalbumin