Abstract
Activation of the hypothalamus-pituitary-adrenal gland (HPA) axis confers adaptations to homeostatic perturbations including food scarcity. A comprehensive new study by Douglass etal. disentangled how agouti-related peptide (AgRP)-expressing neurons of the arcuate nucleus (ARC) trigger rapid HPA-axis activation in response to fasting, which is mediated by repression of a tonic, inhibitory neuro circuit.
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