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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2008.tde-17112008-102233
Document
Author
Full name
Lívia Terezinha Pimentel Branco
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2008
Supervisor
Committee
Costa, Soraia Kátia Pereira (President)
Farsky, Sandra Helena Poliselli
Lima, Wothan Tavares de
Title in Portuguese
Investigação farmacológica de mecanismos neurogênicos e oxidativos no modelo experimental de gastrosquise em ratos.
Keywords in Portuguese
Dexametasoma
Estresse oxidativo
Gastrosquise
Inflamação neurogênica
Ratos
Abstract in Portuguese
A gastrosquise (G) é o defeito congênito de fechamento da parede abdominal, que causa inflamação intestinal. Avaliou-se aqui a expressão protéica e gênica de marcadores neurogênicos e oxidativos no intestino de fetos de ratas tratadas ou não com dexametasona - DMT. Estes foram divididos em grupos: não manipulado (controle; C), falso operado (sham; S) e operado (G). A atividade da mieloperoxidase (MPO) aumentou no grupo G vs. C, não sendo afetada pela DMT. A expressão RNAm do receptor NK2, mas não NK1, VPAC e TRPV1, foi reduzida nos grupos G e S vs. C, sendo esta revertida pela DMT. A iNOS, mas não nNOS e eNOS, foi maior no grupo G. A DMT não inibiu a iNOS mas aumentou a eNOS. COX-2 aumentou na G e não foi afetada pela DMT. A expressão protéica da SOD-1 ou 3-NT não diferiu entre grupos G e controle. O grupo G tratado com DMT exibiu maior nitração protéica. A IL-6 aumentou no grupo G versus C. Conclui-se que a inflamação no intestino de fetos com G origina-se de uma possível combinação entre mecanismos oxidativos, geração de prostanóides e fatores neurovasculares.
Title in English
Oxidative and neurogenic mechanisms of bowel inflammation in experimental model of gastroschisis.
Keywords in English
Dexamentasone
Gastroschisis
Neurogenic inflammation
Oxidative stress
Rats
Abstract in English
Gastroschisis (G) is a congenital defect of the abdominal wall closure resulting in perivisceritis. The role of neurovascular and oxidative mechanisms in this condition was investigated by analyzing the gene and proteic expressions of these markers in the gut of foetus from female rats treated or not with dexamethasone (DMT). Increased MPO activity was found in G vs. control (C) but not sham (S) group. Reduced mRNA expression of NK2 receptor was found in G and S groups. Neither NK1 nor both VIP and TRPV1 receptors expression changed among groups. Increased expression of iNOS and COX-2, but not nNOS, eNOS and COX-1, was seen in G group. DMT reversed the expression of NK2R and increased that of NK1R without affecting iNOS and COX-2 expression. Increased levels of IL-6 but neither SOD-1 nor 3-NT was found in G group. In conclusion, the inflammatory process observed in the gut of foetus with G arises through a combination of neurogenic mechanisms that act in concert with reactive oxygen species and generation of prostanoids to produce gut dysfunction.
 
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Publishing Date
2009-02-18
 
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