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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2014.tde-20022015-171616
Document
Author
Full name
Felipe Grabarz
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2014
Supervisor
Committee
Câmara, Niels Olsen Saraiva (President)
Jacysyn, Jacqueline de Fátima
Lourenço, Alexandre
Title in Portuguese
Células NKT, macrófagos M2 e o desenvolvimento da fibrose pulmonar.
Keywords in Portuguese
Bleomicina
Células NKT
Fibrose pulmonar
Macrófagos M2
Abstract in Portuguese
A fibrose pulmonar é uma via comum de várias doenças agudas e crônicas do interstício pulmonar que pode resultar na cicatrização anormal do pulmão. Há acúmulo excessivo das proteínas da matriz extracelular levando a desestruturação das paredes alveolares, e consequente perda das trocas gasosas pelos pulmões. As células NKT são grande fonte de citocinas e podem ser cruciais na polarização de macrófagos para o fenótipo M2. O projeto tem a hipótese de que as células NKT podem influenciar o desenvolvimento da fibrose pulmonar via modulação de macrófagos. Para isso, animais selvagens e knockout para células NKT invariante (Ja18-/-) foram submetidos ao protocolo de indução de fibrose pulmonar pela bleomicina. Os resultados indicam que o grupo Ja18-/- assim como os grupos experimentais que receberam agonistas para células NKT apresentaram uma proteção contra a fibrose pulmonar uma vez que houve menor síntese de hidroxiprolina, deposição de colágeno, citocinas pró-fibróticas e a manutenção de macrófagos M1 no tecido pulmonar.
Title in English
NKT cells, M2 macrophages and the development of pulmonary fibrosis.
Keywords in English
Bleomycin
Lung fibrosis
M2 macrophages
NKT cells
Abstract in English
Pulmonary fibrosis is a common pathway of various acute and chronic interstitial lung diseases that may result in abnormal healing of the lung. There is excessive accumulation of extracellular matrix proteins, leading to disruption of the alveolar walls and the consequent loss of gas exchange through the lungs. NKT cells are a big source of cytokines and may be crucial in the polarization of macrophages to the M2 phenotype. This project has hypothesized that NKT cells can influence the development of pulmonary fibrosis through modulation of macrophages. For this, wild and knockout invariant NKT cells (Ja18-/-) mice were subjected to the protocol of bleomycin induced pulmonary fibrosis. The results indicate that the group Ja18-/- as well as the experimental groups receiving agonists for NKT cells showed protection against lung fibrosis since there was less synthesis of hydroxyproline, collagen deposition, pro-fibrotic cytokines and maintenance of macrophages M1 in lung tissue.
 
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Publishing Date
2015-02-24
 
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