In male mice that are food-restricted, low doses of semaglutide reduce normal food intake but do not change their motivation to seek sugar or alter dopamine activity in a brain region linked to...
Mechanism
Synthesis from 1 study
A small dose of the drug tells the brain it's full, so the mouse eats less regular food. But it doesn't interfere with the brain's pleasure response to sugar, so the mouse still wants and enjoys sweet treats the same way.
Most probable mechanism
A small amount of the drug activates specific areas in the brain that tell the body it's full, so the mouse eats less regular food. But it doesn't touch the brain's pleasure system that makes the mouse want sweet treats, so the mouse still seeks out sugar and its brain still lights up when it gets the sugar.
Semaglutide binds to GLP-1 receptors in the arcuate nucleus of the hypothalamus and nucleus tractus solitarius, regions with partial blood-brain barrier permeability
GLP-1 receptor activation in these regions suppresses orexigenic neurons (e.g., NPY/AgRP) and activates anorexigenic neurons (e.g., POMC)
Downstream signaling from these hypothalamic and brainstem nuclei reduces hunger drive and increases satiation, leading to decreased voluntary consumption of chow
At low doses, semaglutide does not activate neural projections from the arcuate nucleus or nucleus tractus solitarius to the ventral tegmental area that modulate dopamine neuron firing during reward consumption
Ventral tegmental area dopamine neuron activity during sucrose reward collection remains unchanged because the neural circuits linking satiety signals to reward processing are not engaged at these doses
Evidence from Studies
Supporting (1)
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