Elevation of hypothalamic ketone bodies induces a decrease in energy expenditures and an increase risk of metabolic...

Area of Science:

• Neuroscience
• Metabolic research
• Endocrinology

Background:

• Ketone bodies, such as beta-hydroxybutyrate (BHB), are increasingly recognized as signaling molecules influencing brain regulation of energy balance and obesity.
• The exact mechanisms by which the brain senses ketone bodies and their role in metabolic disorders are not fully understood.
• Mice with partial deletion of the MCT1 transporter (HE mice) show resistance to diet-induced obesity, suggesting a role for ketone bodies in obesity development.

Purpose of the Study:

• To investigate the impact of direct hypothalamic sensing of beta-hydroxybutyrate (BHB) on energy homeostasis.
• To elucidate the role of brain ketone body sensing in the development of metabolic disorders.

Main Methods:

• Utilized a specific infusion of BHB directly into the hypothalamus of wild-type (WT) and MCT1-deficient (HE) mice.
• Analyzed energy homeostasis parameters in mice fed a standard chow diet.

Main Results:

• Elevated BHB levels detected by the hypothalamus significantly disrupt the brain's regulation of energy homeostasis.
• This disruption in central energy control leads to downstream alterations in peripheral energy expenditure mechanisms.

Conclusions:

• Sensing of high BHB levels by the brain contributes to dysregulated energy homeostasis.
• These changes mediated by brain ketone body sensing elevate the risk of obesity onset in mice.