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LEAP2, a ghrelin receptor inverse agonist, and its effect on alcohol-related responses in rodents.
Translational Psychiatry 2024 October 2
The underlying neurobiology of alcohol use disorder (AUD) is complex and needs further unraveling, with one of the key mechanisms being the gut-brain peptide ghrelin and its receptor (GHSR). However, additional substrates of the ghrelin pathway, such as liver-expressed antimicrobial peptide 2 (LEAP2), an endogenous GHSR inverse agonist, may contribute to this neurobiological framework. While LEAP2 modulates feeding and reward through central mechanisms, its effects on alcohol responses are unknown. The aim of the present study was therefore to identify the impact of central LEAP2 on the ability of alcohol to activate the mesolimbic dopamine system and to define its ability to control alcohol intake. These experiments revealed that central LEAP2 (i.e. into the third ventricle) prevented the ability of alcohol to cause locomotor stimulation in male mice, suppressed the memory of alcohol reward and attenuated the dopamine release in the nucleus accumbens caused by alcohol. Moreover, central LEAP2 reduced alcohol consumption in both male and female rats exposed to alcohol for 6 weeks before treatment. However, the serum levels of LEAP2 were similar between high- and low- alcohol-consuming (male) rats. Furthermore, central LEAP2 lowered the food intake in the alcohol-consuming male rats and reduced the body weight in the females. Collectively, the present study revealed that central LEAP2 mitigates alcohol-related responses in rodents, contributing to our understanding of the ghrelin pathway's role in alcohol effects.
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