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| Author(s): |
Rafael de Almeida dos Reis
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Medicina (FM/SBD) |
| Defense date: | 2014-02-17 |
| Examining board members: |
Iolanda de Fátima Lopes Calvo Tibério;
Vera Luiza Capelozzi;
Claudia Marina Fló;
Cristiane Lopes
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| Advisor: | Iolanda de Fátima Lopes Calvo Tibério; Maria Luiza Vilela Oliva |
| Abstract | |
Background: Proteinases play a key role on emphysema development, tissue destruction and mucus production. Bauhinia bauhinioides Cruzipain Inhibitor (BbCI) is a proteinase inhibitor from plant that neutralizes serine and cysteine proteinases. The present study evaluated the effects of the BbCI treatment in pulmonary alterations induced by elastase in mice. Methods: C57Bl6 mice received elastase intratracheally (50 uL/animal, ELA group) or saline (SAL group). Afterwards, mice were treated with BbCI (2 mg/kg) at days 1, 15 and 21 after elastase instillation (ELABC group). Control group received saline and BbCI using the same protocol (SALBC group). At day 28, mice were anesthetized, respiratory mechanics were collected, and exhaled nitric oxide were analyzed. Afterwards, broncoalveolar lavage fluid was obtained and lungs were removed to perform histochemistry and immunohistochemistry stains. By morphometry, the number of neutrophils, TNFalfa, MMP-9, MMP-12, TIMP-1, iNOS, eNOS positive cells as well as the volume proportion of 8-iso-PGF2alfa, collagen and elastic fibers content in alveolar septum and airways walls were performed. In airways walls, we also analyzed the number of MUC-5 positive cells and the number of macrophages. Results: The proteinase inhibitor BbCI was able to reduce the pulmonary mechanical alterations (Ers, Htis and Raw), alveolar septum disruption (Lm) and the BAL cell count (total cells, macrophages and neutrophils) induced by elastase. Regarding the Tese de Doutorado Rafael Almeida-Reis inflammatory response, BbCI also reduced the number of neutrophils and TNFalfa positive cells in both alveolar septum and airway walls, and also reduced the number of macrophages in alveolar septum. Considering the extracellular matrix remodeling, the proteinase inhibitor attenuated the volume fraction of elastic and collagen fibers, MMP-9 and MMP-12 positive cells in both alveolar septum and airway walls. Regarding the oxidative stress response, BbCI reduced the volume fraction of isoprostane in airways and the number of iNOS positive cells in both airways walls and alveolar septum. Finally, BbCI reduced the number of MUC5ac positive cells in airway walls. Conclusions: The treatment with BbCI modulated lung mechanics and reduced inflammatory, remodeling and oxidative stress alterations induced by elastase. Although more studies need to be performed to elucidate the mechanisms involved in this process, but we may considerate BbCI as a potential therapeutic tool for COPD management (AU) | |
| FAPESP's process: | 09/15910-7 - Effect of proteinase inhibitor BbCI on elastase-induced lung injury in C57BL6 mice |
| Grantee: | Rafael de Almeida dos Reis |
| Support Opportunities: | Scholarships in Brazil - Doctorate |