Long-acting glucagon-like peptide-1 receptor agonists have direct access to and effects on pro-opiomelanocortin/cocaine- and amphetamine-stimulated transcript neurons in the mouse hypothalamus.

Long-acting GLP-1 receptor agonists such as liraglutide directly access the arcuate nucleus in the hypothalamus of mice, activating pro-opiomelanocortin (POMC) neurons and increasing cocaine- and amphetamine-regulated transcript (CART) neuropeptide mRNA. This direct neuronal activation correlates with reduced hunger and increased satiety observed clinically.

The study used fluorescently labeled liraglutide and other GLP-1 receptor agonists combined with single-plane illumination microscopy to track drug access to mouse brain regions. Molecular analyses measured changes in neuropeptide mRNA levels in specific hypothalamic neurons after drug administration.

Understanding that GLP-1 receptor agonists directly affect brain neurons controlling appetite provides insight into their weight loss effects, potentially guiding improved obesity treatments.

The study was conducted in mice, so results may not fully translate to humans; the exact clinical relevance and long-term effects require further investigation.