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Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2010.tde-17122010-160716
Document
Author
Full name
Juliano Fernandes de Oliveira
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2010
Supervisor
Committee
Costa, Soraia Kátia Pereira (President)
Antunes, Edson
Farsky, Sandra Helena Poliselli
Fortes, Zuleica Bruno
Saldiva, Paulo Hilario Nascimento
Title in Portuguese
Avaliação das funções erétil e vascular de ratos com inflamação pulmonar decorrente da exposição ao material particulado ambiental liberado na exaustão do diesel.
Keywords in Portuguese
1- 2-naftoquinona
Aorta
Aorta de animal
Corpo cavernoso
Espécies reativas de oxigênio (ERO)
Inflamação pulmonar
Músculo liso vascular
Partículas de exaustão do diesel
Ratos
Abstract in Portuguese
Este estudo se propôs a avaliar o potencial inflamatório das partículas eliminadas na exaustão do diesel (PED) e 1,2-naftoquinona (1,2-NQ) sobre outros compartimentos, como o músculo liso vascular (aorta torácica; RTA) e do corpo cavernoso isolados de ratos (RCC) e os mecanismos envolvidos via ensaios funcionais e bioquímicos. A injeção i.tr. das PED e 1,2-NQ em ratos Wistar causou inflamação e hiporreatividade das vias aéreas associados ao aumento significativo do relaxamento evocado pela ACh na RTA. No RCC desses mesmos animais, tanto o GTN quanto o estímulo elétrico (EFS) causou maior relaxamento. O conteúdo basal de TBARs na RTA e pulmão foi reduzido, embora outros testes indicadores de estresse oxidativo e / ou atividade antioxidante não mostraram diferenças entre os grupos. As taxas de expressão gênica / protéica da nNOS no RCC de ratos não diferiram do grupo controle, mas a expressão da eNOS e iNOS foi reduzida na RTA e RCC. Não foram quantificadas concentrações séricas do TNFα ou IL-1b, sugerindo que os efeitos sistêmicos ocorrem independentemente destas citocinas. Conclui-se que o tratamento agudo de ratos com a mistura de poluentes induziu inflamação das vias aéreas (e hiporreatividade), capaz de afetar outros compartimentos, como a musculatura lisa vascular (RTA) e do RCC.
Title in English
Evaluation of erectile and vascular functions in rat with lung inflammation evoked by exposure to diesel exhaust particles.
Keywords in English
1- 2-napthoquinone
Aorta
Aorta of animals
Cavernosum corpus
Diesel exhaust particles
Lung inflammation
Rats
Reactive oxygen species (ROS)
Vascular smooth muscle
Abstract in English
We tested the hypothesis that local inflammation in the airways evoked by intra-tracheal instillation of the environmental chemical 1,2-naphthoquinone (1,2-NQ) and diesel exhaust particles (DEP) is capable of targeting other systemic compartments, such as vessels (rat thoracic aorta; RTA) and corpus cavernosum (RCC), and possible involved mechanisms. After 3h, this treatment induced airways hyporresponsiveness to ACh and local inflammation. This effect was associated with decreased numbers of leukocyte in the blood and spleen and increased number of leukocytes in the bone marrow. Pollutant treatment also markedly increased ACh-induced relaxation in RTA and by both GTN- and electrical stimulation-induced relaxation in RCC. Exposure to pollutants did not affect FE-induced contraction in RTA. Neither serum levels of cytokines (TNFα e IL-1b) nor basal concentration of total nitrate were different amongst groups. No evidence of increased catalase activity in RTA, RCC and lung was found. The treatment reduced the eNOS e iNOS gene expression in RTA e RCC, without significantly affecting the nNOS gene expression in RCC. Our results are consistent with the hypothesis that DEP-induced airways hiporresponsiveness and inflammation can account to produce systemic changes, such as structural and functional changes in the RTA and RCC by means of substances derived from endothelium or due to the ability of these pollutants to act to stimulate the production of scavenger of free radical.
 
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Publishing Date
2011-03-03
 
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