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Doctoral Thesis
Full name
Mike Yoshio Hamasaki
Knowledge Area
Date of Defense
São Paulo, 2018
Silva, Fabiano Pinheiro da (President)
Ferreira, Regiane Miranda
Chiamolera, Murilo
Park, Marcelo
Pizzol, Felipe Dal
Title in Portuguese
Análise transcriptômica em estruturas encefálicas de ratos jovens e idosos submetidos ao modelo de ligadura e perfuração cecal
Keywords in Portuguese
Córtex pré-frontal
Encefalopatia associada a sepse
Perfilação da expressão gênica
Abstract in Portuguese
Dentre as manifestações clínicas observadas em pacientes sépticos, as disfunções neurológicas são, provavelmente, as de fisiopatologia mais obscura e pobremente explorada, o que consequentemente as torna de difícil entendimento e tratamento médico. Adicionalmente, estudos epidemiológicos indicam que a síndrome séptica é mais frequente e mais letal em pacientes idosos. Nesse contexto, este trabalho objetivou comparar os efeitos da sepse, induzida pelo modelo de ligadura e perfuração cecal, no encéfalo de ratos jovens e idosos por meio da análise da expressão gênica de larga escala (transcriptoma), a fim de averiguar como as alterações no padrão de expressão podem estar relacionadas a disfunções neurológicas. Os resultados deste estudo indicaram a diminuição da expressão dos genes Bcl-3, S100A8 e uridina fosforilase 1, bem como o aumento da expressão de Stefin A3, sendo tais efeitos característicos das manifestações comuns da sepse no sistema nervoso central, independentemente da idade dos animais; por outro lado, a diminuição da expressão do gene da haptoglobina foi observada apenas nos animais idosos com sepse. De forma geral, na comparação entre animais idosos e jovens, os resultados desta pesquisa apontaram que animais idosos apresentam uma quantidade menor de genes modificados pela sepse, o que sugere menor capacidade de ativar mecanismos neuroprotetores
Title in English
Transcriptomic analysis of encephalic structures of young and aging rats submitted to the model of cecal ligation and puncture
Keywords in English
Gene expression profiling
Prefrontal cortex
Sepsis-associated Encephalopathy
Abstract in English
Among the clinical manifestations observed in septic patients, the neurological dysfunctions are probably the most obscure and poorly explored pathophysiology, which consequently makes them difficult to understand and to treat. Additionally, epidemiological studies indicate that septic syndrome is more frequent and more lethal in elderly patients. In this context, this article is aimed at comparing the effects of sepsis, induced by the ligature model and cecal perforation, on the brain of young and elderly rats by means of the analysis of the large scale gene expression (transcriptome), in order to investigate how the changes in this expression may be related to neurological dysfunctions. The results of this study indicated decreased expression of the Bcl-3, S100A8 and uridine phosphorylase 1 genes, as well as increased expression of Stefin A3, these effects being characteristic of the common manifestations of central nervous system sepsis regardless of the age of the animals; on the other hand, decreased haptoglobin gene expression was observed only in the elderly animals with sepsis. In general, in the comparison between old and young animals, the results of this research indicated that elderly animals present a smaller amount of genes modified by sepsis, which suggests a smaller capacity to activate neuroprotective mechanisms
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