Objective: Obesity is a chronic disease that affects more than 400 million adults with severe comorbidities. The search for new treatments to reduce its negative consequences is necessary. Orexins are hypothalamic neuropeptides involved in various physiological processes related to obesity. The aim of this study was to investigate the consequences of chronic orexin-A treatment in mouse models.
Methods: Female wild-type C57BL/6 mice that were obesity-prone or obesity-resistant and mice that were deficient for orexin receptors were fed with a high-fat diet. Glucose tolerance, indirect calorimetry, expression of brain neuropeptides and receptors, microglial activation, and microbiota were determined to evaluate the role of orexins on metabolic flexibility.
Results: Orexin-A reduces weight gain in obesity-prone mice. This reduction is associated with a decrease in body fat, food intake, steatosis, and insulin resistance, as well as alterations of intestinal microbiota composition. A decreased expression of orexin receptors and neuropeptides involved in food intake was also observed in the hypothalamus.
Conclusions: Our data support the notion that orexin receptor signaling is involved in different aspects of energy metabolism and can mitigate several dysfunctions associated with obesity, suggesting that orexin receptors can represent new targets for obesity treatment.
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Article Synopsis
- The olfactory tubercle (OT) has distinct domains (anteromedial and lateral) that play different roles in learning from pleasant and unpleasant smells, but the specifics of how these areas adapt at the synaptic level aren't fully clear.
- In research using mouse OT slices, electrical stimulation combined with orexin treatment showed that the anteromedial domain (amOT) can undergo long-term changes in synaptic strength (LTP), while the lateral domain (lOT) does not exhibit the same response.
- The study found that orexin-A enhances these long-term changes in the amOT, suggesting it's important for learning from food odors, but this mechanism isn't present in the lOT.
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