Desenvolvimento de modelo agudo e crônico de doença pulmonar alérgica em camundongos com extrato bruto de ácaro de origem não comercial

• Autor(a) principal: Nuñez, Nailê Karine
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da PUC_RS
• Texto Completo: http://tede2.pucrs.br/tede2/handle/tede/1435
• topic: MEDICINA; PEDIATRIA; PNEUMOLOGIA; ASMA; IMUNOLOGIA; ÁCAROS; CNPQ::CIENCIAS DA SAUDE::MEDICINA::CLINICA MEDICA::PEDIATRIA

Introduction: The present work included two originals articles about asthma, which is an airway chronic disease characterized by bronchial hiperresponssivenes and variable airway limitation. House dust mites are a major aeroallergen, responsible to trigger chronic inflammation in humans. In recent years there has been a substantial increase in the prevalence of allergic diseases around the world, with regional differences, which has raised many questions about the environmental factors that are involved in the development of allergic response, and especially protective factors in this response, particularly in relation to the effect of infections. Some authors suggest that helminth infections act as a protective factor to allergic diseases. Murine models are widely used, but there is still a need for approaches with protocols more similar to the disease in humans. Objectives: The aim of the first article was develop a experimental model of pulmonary allergic disease using a house dust mite extract produced in a research laboratory with a more simple and economic way and to evaluate their capacity to induce an inflammatory response similar to the ones of established protocols. Methods: In the first article, female adult BALB/C mice were used, exposed acutely and chronically to house dust mite extract (HDM), with group controls. In the second article, C57BL/6 e C57BL/6 TRL4-/- female mice were exposed in early life to Angiostrongylus cantonensis extract, with control groups. At the adult age, animals were submitted to asthma ovalbumin protocol. Results: In the first article, animals exposed to HDM (acute and chronic) had a significant increase in the absolute counts of eosinophils in bronchoalveolar lavage fluid when compared to the negative control (p<0.001 and p=0.002), and showed histological changes consistent with the disease, with increased peribronchovascular infiltrate and mucus secretion, and collagen deposition around the airway. In the second article, animals that received worm extract had a significant increase in total and eosinophil cell counts in both strains, presenting histological changes compatible with these findings, with increased cellular infiltration, goblet cell hyperplasia and increased collagen deposition in the airway. Conclusion: The non-commercial mite extract in the article 1 has shown to be effective to induce an acute and chronic allergic inflammatory response in a murine model. In the second article, the Angiostrongylus cantonensis extract when administered subcutaneously did not inhibit ovalbumin-induced pulmonary allergic disease.