In male mice that are food-restricted, semaglutide increases activity in brain cells involved in reward when they consume sugar, but not when they encounter a signal that predicts sugar will be...
Mechanism
Synthesis from 1 study
Semaglutide doesn’t make the mouse want sugar more — it just makes the brain feel more reward when the mouse actually eats it. This happens because the drug activates brain areas that talk to the reward center, but only during eating, not when the mouse is just waiting for food.
Most probable mechanism
When the mouse eats something sweet, a drug called semaglutide activates certain brain areas near the base of the brain that then send signals to the reward center, making the dopamine neurons there fire more strongly — but only when the mouse is actually eating, not when it’s just expecting food.
Semaglutide crosses into the brain indirectly through regions with leaky blood-brain barriers, such as the nucleus tractus solitarius and arcuate nucleus, or activates vagal nerve signals that relay to these areas.
GLP-1 receptor activation in the nucleus tractus solitarius, arcuate nucleus, or lateral septum triggers neural signaling pathways that project to the ventral tegmental area.
These projections selectively increase excitatory input or reduce inhibition of dopamine neurons in the ventral tegmental area specifically during the act of consuming a sucrose reward.
The increased dopamine neuron activity occurs independently of changes in reward-seeking behavior, indicating a direct modulation of consumption-related signaling rather than anticipatory motivation.
Evidence from Studies
Supporting (1)
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