Identification of a Brainstem Circuit Controlling Feeding

Area of Science:

• Neuroscience
• Metabolism
• Endocrinology

Background:

• Hunger and feeding are regulated by the hypothalamus, but roles of other brain regions are unclear.
• Specific neuronal populations in the dorsal raphe nucleus (DRN) involvement in energy balance requires further elucidation.

Purpose of the Study:

• To investigate the function of specific neuronal cell types in the dorsal raphe nucleus (DRN) in regulating feeding behavior and energy balance.
• To identify potential therapeutic targets for obesity within the DRN.

Main Methods:

• Electrophysiological recordings and in vivo manipulations of DRN^Vgat and DRN^VGLUT3 neurons.
• Analysis of feeding behavior, body weight, and locomotor activity in lean and obese mouse models.
• Molecular profiling to identify druggable targets and subsequent pharmacological interventions.

Main Results:

• DRN^Vgat and DRN^VGLUT3 neurons show reciprocal activation with energy balance changes.
• Modulating DRN^Vgat neurons increased food intake, while modulating DRN^VGLUT3 neurons suppressed it.
• Targeted modulation in obese mice reduced food intake, body weight, and normalized activity; identified druggable targets with potent feeding effects.

Conclusions:

• The dorsal raphe nucleus (DRN) is a critical control center for energy balance.
• Specific neuronal populations within the DRN, DRN^Vgat and DRN^VGLUT3, exert opposing effects on feeding.
• DRN neurons represent promising targets for obesity interventions.