This record provides bibliographic details and links to the original research. An editorial study breakdown is not available.
What the researchers found
Microinjection of ghrelin into the VTA dose-dependently increased reward-based feeding and fasting-induced hyperphagia on a high-fat diet in rats, resulting in significant 24-hour body weight gain. These effects were blocked by the ghrelin receptor antagonist D-Lys3-GHRP-6, demonstrating that ghrelin signaling in the VTA mediates both hedonic and hunger-driven overeating.
Why it matters
Understanding how ghrelin in the brain's reward centers drives overeating of high-fat foods can help develop targeted treatments for obesity and related eating disorders by modulating this pathway.
How the study worked
Rats were conditioned to restricted feeding schedules and given intra-VTA microinjections of varying doses of ghrelin or a ghrelin receptor antagonist. Food intake of high-fat diet and body weight changes were measured under sated and fasting conditions to assess ghrelin's effects on feeding behavior.
What this study cannot tell us
The study was conducted in rats, so results may not fully translate to humans. The exact neural circuits downstream of VTA ghrelin signaling were not explored in detail.
Read the original research
Ghrelin signaling in the ventral tegmental area mediates both reward-based feeding and fasting-induced hyperphagia on high-fat diet.
Neuroscience, 300, 53-62
Citation
Wei, X J; Sun, B; Chen, K; Lv, B; Luo, X; Yan, J Q. (2015). Ghrelin signaling in the ventral tegmental area mediates both reward-based feeding and fasting-induced hyperphagia on high-fat diet.. Neuroscience, 300, 53-62. https://doi.org/10.1016/j.neuroscience.2015.05.001