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| Author(s): |
Érica Nogueira Borducchi
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Ciências Biomédicas (ICB/SDI) |
| Defense date: | 2009-09-17 |
| Examining board members: |
Momtchilo Russo;
Silvia Beatriz Boscardin;
Claudia Rocha Carvalho;
Antonio Condino Neto;
Frederico Azevedo da Costa Pinto
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| Advisor: | Momtchilo Russo |
| Abstract | |
Mucosal administration of soluble Ags, before the sensitization with the same Ag, leads to mucosal tolerance. We studied the effect of i.n. LPS during the induction of ovalbumin (OVA) nasal tolerance. The majority of murine models of asthma used OVA as allergen,thus, we also used Blomia tropicalis (Bt) extract, a mite more common in asthmatic patients. Features of Bt block the nasal tolerance establishment and experimental data indicates that tolerance towards an Ag can promote tolerance to another not related Ag (cross-tolerance). Therefore, we evaluated if OVA or hen-egg white lisozyme (HEL) tolerance could result in cross-tolerance to the Bt. Our data showed that i.n. LPS during induction of tolerance to OVA prevents the establishment of this tolerance, resulting in neutrophil migration, IgG2a production, decreased levels of IgE and increased anaphylactic IgG1. We verify that nasal tolerance to HEL or OVA is not capable in induce cross-tolerance against the Bt. We also observed that OVA oral tolerance is able to induce cross-tolerance against Bt. (AU) | |