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p53 is required for brain growth but is dispensable for resistance to nutrient restriction during Drosophila larval development.
Contreras, Esteban G; Sierralta, Jimena; Glavic, Alvaro.
Afiliação
  • Contreras EG; Biomedical Neuroscience Institute and Department of Neuroscience, Faculty of Medicine, Universidad de Chile, Independencia Santiago-Chile.
  • Sierralta J; Center for Genome Regulation, Department of Biology, Faculty of Science, Universidad of Chile, Las Palmeras Nuñoa, Santiago-Chile.
  • Glavic A; Biomedical Neuroscience Institute and Department of Neuroscience, Faculty of Medicine, Universidad de Chile, Independencia Santiago-Chile.
PLoS One ; 13(4): e0194344, 2018.
Article em En | MEDLINE | ID: mdl-29621246
BACKGROUND: Animal growth is influenced by the genetic background and the environmental circumstances. How genes promote growth and coordinate adaptation to nutrient availability is still an open question. p53 is a transcription factor that commands the cellular response to different types of stresses. In adult Drosophila melanogaster, p53 regulates the metabolic adaptation to nutrient restriction that supports fly viability. Furthermore, the larval brain is protected from nutrient restriction in a phenomenon called 'brain sparing'. Therefore, we hypothesised that p53 may regulate brain growth and show a protective role over brain development under nutrient restriction. RESULTS: Here, we studied the function of p53 during brain growth in normal conditions and in animals subjected to developmental nutrient restriction. We showed that p53 loss of function reduced animal growth and larval brain size. Endogenous p53 was expressed in larval neural stem cells, but its levels and activity were not affected by nutritional stress. Interestingly, p53 knockdown only in neural stem cells was sufficient to decrease larval brain growth. Finally, we showed that in p53 mutant larvae under nutrient restriction, the energy storage levels were not altered, and these larvae generated adults with brains of similar size than wild-type animals. CONCLUSIONS: Using genetic approaches, we demonstrate that p53 is required for proper growth of the larval brain. This developmental role of p53 does not have an impact on animal resistance to nutritional stress since brain growth in p53 mutants under nutrient restriction is similar to control animals.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Encéfalo / Proteína Supressora de Tumor p53 / Drosophila Limite: Animals Idioma: En Ano de publicação: 2018 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Encéfalo / Proteína Supressora de Tumor p53 / Drosophila Limite: Animals Idioma: En Ano de publicação: 2018 Tipo de documento: Article