Amygdala-liver signalling orchestrates glycaemic responses to stress.
Level 5 - mechanism / opinion, no new human data
Preclinical animal and mechanistic research
PubMed 40903586 · doi:10.1038/s41586-025-09420-1
What was done
The authors investigated how the amygdala coordinates metabolic responses to stress. Using viral tracing and physiological assays in an animal model, they mapped neural projections from medial amygdala (MeA) neurons innervating the ventromedial hypothalamus (VMH) to peripheral organs and evaluated their role in glucose regulation and food intake under acute and repeated stress.
What was found
The abstract reports no numerical values or sample sizes. Qualitatively, acute stress activated MeA-VMH neurons, precipitating hyperglycemia and hypophagia. This glycemic response occurred independently of adrenal or pancreatic glucoregulatory hormones. Whole-body virus tracing revealed a polysynaptic neural pathway from the MeA to the liver that directly stimulated hepatic gluconeogenesis. Repeated stress exposure impaired MeA-mediated glucose regulation, resulting in diabetes-like dysregulation of glucose homeostasis.
Why it matters
This study establishes a direct amygdala-liver neurocircuit that regulates rapid glycemic adaptations to stress without relying on classic endocrine pathways. It provides a neurobiological framework for understanding how chronic stress may contribute to metabolic disease.
Limits
The findings derive exclusively from preclinical animal models, and relevance to human metabolic physiology remains unverified. The abstract does not report sample sizes, animal model species/sex, statistical measures, or effect sizes.
Cited by
- supports Psychological stress increases blood glucose levels.