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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Efeitos da defici?ncia de vitamina D na fun??o pulmonar de um modelo de asma al?rgica experimental

Nu?ez, Nail? Karine 12 July 2017 (has links)
Submitted by PPG Pediatria e Sa?de da Crian?a (pediatria-pg@pucrs.br) on 2018-02-16T19:15:31Z No. of bitstreams: 1 Tese final 2018 - artigo publicado.pdf: 1647298 bytes, checksum: 03a39af4be2d469330c9618fb70f9cdd (MD5) / Approved for entry into archive by Caroline Xavier (caroline.xavier@pucrs.br) on 2018-02-23T16:28:05Z (GMT) No. of bitstreams: 1 Tese final 2018 - artigo publicado.pdf: 1647298 bytes, checksum: 03a39af4be2d469330c9618fb70f9cdd (MD5) / Made available in DSpace on 2018-02-23T16:35:09Z (GMT). No. of bitstreams: 1 Tese final 2018 - artigo publicado.pdf: 1647298 bytes, checksum: 03a39af4be2d469330c9618fb70f9cdd (MD5) Previous issue date: 2017-07-12 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Background: Asthma is a chronic disease of the airways, characterized by bronchial inflammation and hyperresponsiveness, which affects approximately 300 million people around the world. The increase in the prevalence of asthma in recent years has been associated with an increase in vitamin D deficiency. About 1 billion people in the world have insufficient levels of vitamin D due to many factors such as reduced outdoor activities, sunscreens use and a diet low in vitamin D. In addition, many studies suggest that vitamin D deficiency has a direct effect on lung function, leading to changes in the structure of the airways and in the inflammatory process. Objectives: To evaluate the effect of vitamin D deficiency at different life stages in a murine model of allergic airways disease house dust mite (HDM) induced on inflammation and lung function. Methods: Female BALB / c mice were placed in a diet replete or deficient in vitamin D at three-week old. At 8 weeks, females were mated with males on a diet replete in vitamin D. At birth, pups were cross-fostered to assess the effects of vitamin D deficiency at different stages of life, in utero (Vit D -/+), postnatal (Vit D +/-) and whole-life (Vit D - / -) compared to the control group whole-life vitamin D replete (Vit D + / +). At 8 weeks of age, mice of both sexes were challenged for 10 consecutive days intranasally with either HDM extract or saline solution after mild anesthesia. The animals were anesthetized for lung function test and then submitted to euthanasia for bronchoalveolar lavage (BAL) and lung tissue removal 24 hours after the last intranasal challenge. The total BAL cell count and collagen quantification of lung tissue homogenized were evaluated. Results: Vitamin D deficiency did not affect HDM-induced inflammation, which was characterized by BAL eosinophilia. Vitamin D deficiency at any life stage (in utero, postnatal and all life) caused impairment of lung function, increased tissue damping and tissue elastance, being particularly observed in females. On the other hand, the asthma HDM-induced decreased airway distensibility, but only in females and vitamin D do not altered this response. Conclusion: Our results suggest that vitamin D and HDM have different mechanisms that influence in the development of allergic lung disease and furthermore the effects appear to be sex-specific. / Introdu??o: A asma ? uma doen?a cr?nica das vias a?reas, caracterizada por inflama??o e hiperresponsividade br?nquica, que atinge aproximadamente 300 milh?es de pessoas ao redor do mundo. O aumento da preval?ncia da asma nos ?ltimos anos tem sido associado ao aumento da defici?ncia de vitamina D. Cerca de 1 bilh?o de pessoas no mundo apresenta n?veis insuficientes de vitamina D em fun??o de diversos fatores, tais como a redu??o de atividades ao ar livre, uso de protetor solar e dieta pobre em vitamina D. Al?m disso, estudos sugerem que a defici?ncia de vitamina D possui um efeito direto na fun??o pulmonar, causando altera??es na estrutura das vias a?reas e no processo inflamat?rio. Objetivo: Avaliar o efeito da defici?ncia de vitamina D em diferentes est?gios da vida de camundongos com asma induzida por ?caro domiciliar (house dust mite; HDM) sobre a inflama??o e fun??o pulmonar. M?todos: Camundongos BALB/c f?meas receberam dieta rica ou deficiente em vitamina D a partir da terceira semana de vida. Com 8 semanas de vida, as f?meas foram acasaladas com machos em dieta rica em vitamina D. Ao nascimento foi realizado o cross-fostering (ado??o cruzada) com a prole para que fosse poss?vel avaliar o efeito da defici?ncia de vitamina D em diferentes est?gios da vida, in utero (Vit D -/+), p?s-natal (Vit D +/-) e durante toda a vida (Vit D -/-), em compara??o ao grupo controle, que recebeu dieta rica em vitamina D durante toda a vida (Vit D +/+). Com 8 semanas de vida, camundongos de ambos os sexos foram desafiados por 10 dias consecutivos por via intranasal, com extrato de HDM ou apenas solu??o salina. Os animais foram anestesiados para a realiza??o do teste de fun??o pulmonar e ent?o submetidos a eutan?sia para a realiza??o do lavado broncoalveolar (LBA) e retirada do tecido pulmonar, 24 horas ap?s o ?ltimo desafio intranasal. Foi avaliada a contagem total de c?lulas do LBA e quantifica??o de col?geno no homogeneizado de tecido pulmonar. Resultados: A defici?ncia de vitamina D n?o afetou a inflama??o induzida por HDM, que foi caracterizada por eosinofilia no LBA. A defici?ncia de vitamina D em qualquer fase da vida dos camundongos (in utero, p?s-natal e durante toda a vida) causou uma piora na fun??o pulmonar, aumentando o tissue damping e tissue elastance, sendo observado particularmente em f?meas. Por outro lado, a asma induzida por HDM diminuiu a distensibilidade das vias a?reas apenas em f?meas e a vitamina D n?o alterou essa resposta. Conclus?o: Nossos resultados sugerem que a vitamina D e HDM possuem diferentes mecanismos que influenciam no desenvolvimento da doen?a pulmonar al?rgica e, al?m disso, os efeitos parecem ser dependentes do sexo.

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