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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2009.tde-07072009-130714
Document
Author
Full name
Josias Brito Frazão
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2009
Supervisor
Committee
Condino Neto, Antonio (President)
Grumach, Anete Sevciovic
Negro, Sonia Jancar
Title in Portuguese
Efeito do interferon-gamma sobre defeitos de "splicing" que levam à doença granulomatosa crônica ligada ao cromossomo X.
Keywords in Portuguese
Doença granulomatosa crônica
Doenças imunológicas
IFN-gama
Imunologia
Interferons
Ligado ao X
\"Splicing\"
Abstract in Portuguese
Os fagócitos contêm uma nicotinamida adenina dinucleotídeo fosfato (NADPH) oxidase associada à membrana, que gera superóxido e outros reativos intermediários do oxigênio. Defeitos nesta oxidase em seres humanos resultam na doença granulomatosa crônica (DGC). Mutações próximas aos sítios de splicing que interferem com o processamento do RNA mensageiro, acarretando deleção de um ou mais exons, são cada vez mais freqüentes na literatura científica, nesses casos, os mecanismos moleculares que levam a DGC nem sempre são totalmente esclarecidos, assim como o efeito do IFN-g, seja sobre o processamento da mensagem ou estabilidade dos transcritos. Com base nessas informações o objetivo geral deste trabalho é investigar o efeito do IFN-g sobre a regulação do sistema NADPH oxidase fagocítico humano. Através dos resultados obtidos, não se pode constatar melhora na produção de ânions superóxido após o tratamento com IFN-g em pacientes com defeito de splicing, no entanto detectou-se aumento da expressão do gene CYBB através de PCR convencional e através de real-time PCR além de um aumento na marcação de proteínas do spliceossoma através do FAN.
Title in English
Interferon-gamma effect on splicing defects that cause chronic granulomatous disease linked to X chromosome.
Keywords in English
Chronic granulomatous disease
IFN-gama
Immunologic diseases
Immunology
Interferons
Splicing
X linked
Abstract in English
Phagocytes have a nicotinamide adenine dinucleotide phosphate-oxidase (NADPH) associated to plasmatic membrane that generates superoxide and other oxygen reactive intermediates. Defects on this oxidase in humans result in a disorder called Chronic Granulomatous Disease (CGD). Mutations next to splicing sites that interfere with the mRNA processing leading to deletion of one or more exons, are even more frequent on scientific literature, in these cases, the molecular mechanisms causing CGD are not always completetly clear, as well as the effect of IFN-g on the mRNA processing or on the stability of transcripts. Based on this information our aim is to investigate the effect of IFN-g on the regulation of the human NADPH oxidase phagocyte system.. With the obtained results it wasnt possible to see an increase in anion superoxide production after the IFN-g treatment in patients with splicing defects, however it was detected an increase on the expression of CYBB gene by conventional and real-time PCR besides an increase in the marking of spliceossomal proteins by FAN.
 
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Publishing Date
2009-08-17
 
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