PT  - JOURNAL ARTICLE
AU  - Bérengère Coupé
AU  - Corinne Leloup
AU  - Julien Maillard
AU  - Luc Pénicaud
AU  - Tamas L. Horvath
AU  - Sebastien G. Bouret
TI  - Defective Autophagy in <em>Sf1</em> Neurons Perturbs the Metabolic Response to Fasting and Causes Mitochondrial Dysfunction
AID  - 10.1101/2020.11.02.348789
DP  - 2020 Jan 01
TA  - bioRxiv
PG  - 2020.11.02.348789
4099  - http://biorxiv.org/content/early/2020/11/02/2020.11.02.348789.short
4100  - http://biorxiv.org/content/early/2020/11/02/2020.11.02.348789.full
AB  - Objective The ventromedial nucleus of the hypothalamus (VMH) is a critical component of the forebrain pathways that regulate energy homeostasis. It also plays an important role in the metabolic response to fasting. However, the mechanisms contributing to these physiological processes remain elusive. Autophagy is an evolutionarily conserved mechanism that maintains cellular homeostasis by turning over cellular components and providing nutrients to the cells during starvation. Here we investigated the importance of the autophagy-related gene Atg7 in Sf1-expressing neurons of the VMH in control and fasted conditions.Methods We generated Sf1-Cre; Atg7loxP/loxP mice and examined their metabolic and cellular response to fasting.Results Fasting induces autophagy in the VMH, and mice lacking Atg7 in Sf1-expressing neurons display altered regulation in glucose and leptin homeostasis and impaired energy expenditure regulation in response to fasting. Moreover, loss of Atg7 in Sf1 neurons causes alterations in the central response to fasting. Furthermore, alterations in mitochondria morphology and activity are observed in mutant mice.Conclusion Together, these data show that autophagy is nutritionally regulated in VMH neurons and that VMH autophagy participates in the control of energy homeostasis during fasting.Competing Interest StatementThe authors have declared no competing interest.