Evaluation of different immunization protocols with P. brasiliensis antigens in Guinea pigs Avaliação de diferentes protocolos de imunização em cobaias utilizando antígenos de P. brasiliensis

• Published in: Revista do Instituto de Medicina Tropical de São Paulo
• Main Authors: Amélia Kamegasawa, Maria Tereza Rezkallah Iwasso, Rosa Viero, Marcello Franco
• Format: Article in Journal/Newspaper
• Language: English
• Published: Universidade de São Paulo (USP) 1992
• Subjects: Paracoccidioides brasiliensis antigens; Guinea pigs; Immunization protocols; Arctic medicine. Tropical medicine; RC955-962; Infectious and parasitic diseases; RC109-216; Arctic
• Online Access: https://doi.org/10.1590/S0036-46651992000300011; https://doaj.org/article/4c0e225f2bd542108c4e36ab72923244

The objective of the present study was to develop an efficient and reproducible protocol of immunization of guinea pigs with P. brasiliensis antigens as an animal model for future studies of protective immunity mechanisms. We tested three different antigens (particulate, soluble and combined) and six protocols in the presence and absence of Freund's complete adjuvant and with different numbers of immunizing doses and variable lenght of time between the last immunizing dose and challenge. The efficacy of the immunizing protocol was evaluated by measuring the humoral and cellular anti-P. brasiliensis immune response of the animals, using immuno-diffusion, skin test and macrophage migration inhibition test. It was observed that: 1. Three immunizing doses of the antigens induced a more marked response than two doses; 2. The highest immune response was obtained with the use of Freund's complete adjuvant; 3. Animals challenged a long time (week 6) after the last immunizing dose showed good anti-P. brasiliensis immune response; 4. The particulate antigen induced the lowest immune response. The soluble and the combined antigens were equally efficient in raising good humoral and cellular anti-P. brasiliensis immune response O objetivo deste trabalho foi desenvolver protocolo eficiente e reprodutível de imunização em cobaias com antígenos de P. brasiliensis, visando a obtenção de modelo experimental para futuros estudos de mecanismos de proteção imunológica. Testaram-se três diferentes antígenos (particulado, solúvel e composto) e seis protocolos nos quais foram avaliadas as influências dos seguintes fatores: presença ou ausência de adjuvante completo de Freund, número de doses imunizantes e intervalo de tempo entre a última dose imunizante e o desafio. A eficiência do protocolo de imunização foi estudada pela avaliação da resposta imune celular e humoral anti-P. brasiliensis, utilizando teste cutâneo e teste de inibição da migração do macrófago, e imunodifusão, respectivamente. Observou-se que: 1. Três doses imunizantes ...