Central appetite and satiety circuits

The central appetite and satiety circuits comprise a sophisticated neural network, primarily centered in the hypothalamus and brainstem, that maintains energy homeostasis by integrating peripheral metabolic signals (Morton et al., 2014, Nature). This system involves the arcuate nucleus (ARC), where pro-opiomelanocortin (POMC) neurons promote weight loss and agouti-related peptide (AgRP)/neuropeptide Y (NPY) neurons promote weight gain (StatPearls, 2023). These neurons respond to circulating hormones such as leptin, insulin, and ghrelin, as well as gut-derived peptides like GLP-1, to modulate hunger and fullness via the paraventricular nucleus (PVN) and the nucleus tractus solitarius (NTS) (Cell, 2012). Dysregulation of these circuits is a hallmark of obesity, where leptin resistance or impaired satiety signaling leads to chronic overconsumption and metabolic dysfunction (Nature Reviews Endocrinology, 2017). Therapeutic strategies typically involve targeting specific receptors within these circuits, such as the GLP-1 receptor or the melanocortin-4 receptor (MC4R), to restore homeostatic balance and treat metabolic diseases (PubMed, 2021).

Other names

Hypothalamic appetite-regulating networkEnergy homeostasis circuitsMelanocortin systemHypothalamic-brainstem axisCentral feeding circuits

Pharmacological modulation of specific G protein-coupled receptors and neurotransmitter transporters within the hypothalamus and brainstem to shift the balance between anorexigenic (satiety-promoting) and orexigenic (hunger-promoting) signaling pathways.