Chronic Stress Induces Hepatic Steatosis via Brain-Hepatic Sympathetic Axis Mediated Catecholamine Resistance

Chronic stress is epidemiologically linked to metabolic dysfunction-associated steatotic liver disease (MASLD), yet the underlying mechanisms remain unclear.In mice exposed to chronic restraint stress (CRS), we observed weight-independent hepatic steatosis with marked degeneration of sympathetic fibers.Stress elevated circulating norepinephrine levels but blunted hepatic -adrenergic/cyclic adenosine monophosphate (cAMP) signaling accompanied by downregulation of 3-adrenergic receptor (3-AR), indicating hepatic catecholamine resistance.Blocking hepatic sympathetic input prevented stress-aggravated steatosis and restored -adrenergic signaling, whereas pharmacologic activation of 3-AR with mirabegron alleviated stress-induced lipid accumulation.Pseudorabies virus retrograde tracing and neuronal circuit interrogation further showed that projection from the medial central amygdaloid nucleus (CeM) to paraventricular hypothalamic corticotropin-releasing hormone (CRH PVH ) neurons mediated stress induced hepatic steatosis.Together, these results reveal a CeM-CRH PVH -hepatic sympathetic axis that couples central stress signaling to peripheral -adrenergic desensitization and lipid dysregulation, thereby suggesting a potential therapeutic strategy for stress-related MASLD.