AGRP is a neuropeptide antagonist of melanocortin receptors MC3R and MC4R that plays a central role in appetite regulation and energy homeostasis 12. The protein functions by blocking agonist-induced signaling and promoting receptor endocytosis, thereby inhibiting cAMP production in hypothalamic circuits 134. In the arcuate nucleus, AGRP-producing neurons signal hunger and stimulate food intake through antagonism of anorexigenic melanocortin pathways 5. These neurons integrate metabolic signals from peripheral hormones (ghrelin, leptin, insulin) to regulate feeding behavior and energy expenditure 56. Recent mechanistic studies reveal that AGRP neuronal activity is controlled by synaptic plasticity from the paraventricular hypothalamus 7, lipid metabolism via Nogo-A expression 8, and inhibition by circulating metabolites like Lac-Phe through KATP channel activation 9. AGRP neurons also modulate mood and mental health through GABAergic projections to the bed nucleus of the stria terminalis, linking obesity with anxiety and depression 10. Dysregulation of AGRP signaling is implicated in obesity and metabolic disorders, making this neuropeptide system a prominent therapeutic target for weight management and related comorbidities.