Dorsomedial striatal GABA dynamics organize palatable reward consumption and are reshaped by GLP-1 receptor agonism
Palatability and metabolic state strongly shape food consumption, making it important to understand the neural mechanisms that integrate these influences. Glucagon-like peptide-1 (GLP-1) receptor agonists are potent modulators of food intake and increasingly used therapeutic options, yet the circuit mechanisms underlying their effects remain unclear. Dorsal striatal inhibitory circuits contribute…
Dorsomedial striatal GABA signals are crucial in shaping palatable reward consumption, and these signals can be influenced by metabolic states. Glucagon-like peptide-1 (GLP-1) receptor agonists are known to modulate food intake and are commonly used in therapies, but the underlying neural mechanisms are still being explored. Researchers used fiber photometry in mice to investigate how dorsal striatal inhibitory circuits, particularly in the dorsomedial striatum (DMS), contribute to reward-guided behavior and feeding.
They discovered that DMS GABA signals decreased when consumption began, and this decrease correlated with the palatability of the food, preceded licking behavior, and was heightened during periods of food deprivation. The GLP-1 receptor agonist semaglutide reduced overall intake, disrupted the relationship between DMS GABA and licking behaviors, increased signals in DMS that occurred after feeding pauses, and enhanced synchrony within the DMS ensemble.
Moreover, the study found that optogenetic stimulation of DMS GABAergic interneurons could replicate the effects of semaglutide on consumption patterns. These findings indicate that DMS GABA dynamics serve as a state-dependent regulator of palatable consumption, and that their organization is altered by GLP-1 receptor agonism.
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