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Saturated fatty acids modulate autophagy's proteins in the hypothalamus.

PloS one (2015-03-19)
Mariana Portovedo, Letícia M Ignacio-Souza, Bruna Bombassaro, Andressa Coope, Andressa Reginato, Daniela S Razolli, Márcio A Torsoni, Adriana S Torsoni, Raquel F Leal, Licio A Velloso, Marciane Milanski
ABSTRACT

Autophagy is an important process that regulates cellular homeostasis by degrading dysfunctional proteins, organelles and lipids. In this study, the hypothesis that obesity could lead to impairment in hypothalamic autophagy in mice was evaluated by examining the hypothalamic distribution and content of autophagic proteins in animal with obesity induced by 8 or 16 weeks high fat diet to induce obesity and in response to intracerebroventricular injections of palmitic acid. The results showed that chronic exposure to a high fat diet leads to an increased expression of inflammatory markers and downregulation of autophagic proteins. In obese mice, autophagic induction leads to the downregulation of proteins, such as JNK and Bax, which are involved in the stress pathways. In neuron cell-line, palmitate has a direct effect on autophagy even without inflammatory activity. Understanding the cellular and molecular bases of overnutrition is essential for identifying new diagnostic and therapeutic targets for obesity.

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