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Regina-Ferreira, Lara ; Valdivieso-Rivera, Fernando ; Angelim, Monara K. S. C. ; Menezes dos Reis, Larissa ; Furino, Vanessa O. ; Morari, Joseane ; Maia de Sousa, Lizandra ; Consonni, Silvio Roberto ; Sponton, Carlos H. ; Moraes-Vieira, Pedro M. ; Velloso, Licio A.

• Tipo de documento: Artigo Científico
• Fonte: AMERICAN JOURNAL OF PHYSIOLOGY-ENDOCRINOLOGY AND METABOLISM; v. 326, n. 5, p. 15-pg., 2024-05-10.

Resumo

Hypothalamic proopiomelanocortin (POMC) neurons are sensors of signals that reflect the energy stored in the body. Inducing mild stress in proopiomelanocortin neurons protects them from the damage promoted by the consumption of a high-fat diet, mitigating the development of obesity; however, the cellular mechanisms behind these effects are unknown. Here, we induced mild stress in a proopiomelanocortin neuron cell line by inhibiting Crif1. In proopiomelanocortin neurons exposed to high levels of palmitate, the partial inhibition of Crif1 reverted the defects in mitochondrial respiration and ATP production; this was accompanied by improved mitochondrial fusion/fission cycling. Furthermore, the partial inhibition of Crif1 resulted in increased reactive oxygen species production, increased fatty acid oxidation, and reduced dependency on glucose for mitochondrial respiration. These changes were dependent on the activity of CPT-1. Thus, we identified a CPT-1-dependent metabolic shift toward greater utilization of fatty acids as substrates for respiration as the mechanism behind the protective effect of mild stress against palmitate-induced damage of proopiomelanocortin neurons. (AU)

• Processo FAPESP: 13/07607-8 - CMPO - Centro Multidisciplinar de Pesquisa em Obesidade e Doenças Associadas
• Beneficiário: Licio Augusto Velloso
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 21/06461-6 - Resposta integrada de estresse mitocondrial e a regulação do processamento de pró-opiomelanocortina em linhagens de células neuronais hipotalâmicas
• Beneficiário: Lara Regina Ferreira
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 22/04576-3 - EMU concedido no processo 2020/16030-0: analisador metabólico de 96 poços seahorse XFe96
• Beneficiário: Pedro Manoel Mendes de Moraes Vieira
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários