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Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2022.tde-14082023-155339
Document
Author
Full name
Vitor Yonamine Lee
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2022
Supervisor
Committee
Nogueira, Maria Ines (President)
Frazão, Renata
Teixeira, Lívia Clemente Motta
Xavier, Gilberto Fernando
Title in Portuguese
Efeitos da Alda nas injúrias provocadas pela anóxia neonatal em camundongos C57BL/6 com e sem a mutação ALDH2*2.
Keywords in Portuguese
Alda
Aldeído desidrogenase 2
Aldeídos
Anóxia neonatal
Ansiedade
Abstract in Portuguese
Mundialmente, cerca de 15-20% das crianças afetadas pela asfixia perinatal morrem e cerca de 25% dos sobreviventes apresentam problemas neurológicos. Com o objetivo de desenvolver tratamentos contra a asfixia perinatal, administramos o fármaco Alda-1 [N-(1,3-benzodioxol- 5-ilmetil)-2,6 diclorobenzamida] em camundongos que sofreram anóxia neonatal para avaliar os efeitos neuroprotetores da substância. A Alda aumenta a atividade da enzima aldeído desidrogenase 2 (ALDH2), que remove o 4-hidroxinonenal (4-HNE) da célula, um aldeído tóxico resultante da anóxia. A anóxia foi realizada em filhotes com 36-48 h de vida, a 36,5°C, com nitrogênio gasoso 100% a um influxo de 1,5 L/minuto, durante 21 minutos. A Alda foi aplicada 30 minutos antes e depois da anóxia. Os experimentos foram realizados em camundongos com e sem a mutação E487K no gene ALDH2, que codifica a enzima de mesmo nome. A atividade da ALDH2 no encéfalo de mutantes que receberam Alda diminuiu 24 horas após a anóxia neonatal. A anóxia diminuiu o peso dos animais, mas nos mutantes a Alda impediu essa diminuição. A Alda também impediu que a anóxia atrasasse o surgimento de alguns reflexos sensoriomotores, que aumentasse os níveis de 4-HNE no hipocampo e que alterasse o desempenho em testes de memória, exploração e locomoção. Tais resultados indicam que a Alda promove proteção frente à anóxia neonatal. Porém, ela também se mostrou ansiogênica e tal efeito colateral deve ser observado.
Title in English
Effects of Alda on injuries caused by neonatal anoxia in C57BL/6 mice with and without the ALDH2*2 mutation.
Keywords in English
Alda
Aldehyde dehydrogenase 2
Aldehydes
Anxiety
Neonatal anoxia
Abstract in English
Worldwide, about 15-20% of children affected by perinatal asphyxia die and about 25% of survivors have neurological problems. In order to develop treatments against perinatal asphyxia, we administered the drug Alda-1 [N-(1,3-benzodioxol-5-ylmethyl)-2,6 dichlorobenzamide] in mice that suffered neonatal anoxia to evaluate the neuroprotective effects of the substance. Alda increases the activity of the enzyme aldehyde dehydrogenase 2 (ALDH2), which removes 4-hydroxynonenal (4-HNE) from the cell, a toxic aldehyde resulting from anoxia. Anoxia was performed on pups with 36-48 h of life, at 36.5°C, with 100% nitrogen gas at an inflow of 1.5 L/minute, for 21 minutes. Alda was applied 30 minutes before and after anoxia. The experiments were carried out in mice with and without the E487K mutation in the ALDH2 gene, which encodes the enzyme of the same name. ALDH2 activity in the brain of mutants that received Alda decreased 24 hours after neonatal anoxia. Anoxia reduced the weight of the animals, but in the mutants, Alda prevented this decrease. Alda also prevented anoxia from delaying the onset of some sensorimotor reflexes, increasing 4-HNE levels in the hippocampus, and altering performance on tests of memory, exploration, and locomotion. Such results indicate that Alda promotes protection against neonatal anoxia. However, it also proved to be anxiogenic and such a side effect should be noted.
 
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Publishing Date
2023-08-16
 
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