Neuromedin U Signaling in Energy Homeostasis and Metabolism

Neuromedin U (NMU) is an evolutionarily conserved neuropeptide that exerts multifaceted control over energy balance, integrating central and peripheral signals to regulate food intake, energy expenditure and glucose homeostasis. Two cognate G protein–coupled receptors, NMUR1 and NMUR2, display distinct tissue distributions: NMUR1 predominates in peripheral organs such as the gut and adipose tissue, whereas NMUR2 is enriched within hypothalamic nuclei. Within the hypothalamus, NMU acts as an anorexigenic factor, suppressing appetite via activation of melanocortin and corticotropin-releasing hormone pathways, and enhancing thermogenesis through downstream sympathetic outflow. In peripheral tissues, NMU influences lipid metabolism, insulin secretion and inflammatory responses, positioning it at the nexus of metabolic regulation and immune signalling. Dysregulation of NMU pathways has been linked to obesity, insulin resistance and metabolic syndrome in preclinical models, suggesting that modulation of NMU signalling may offer novel therapeutic avenues. Furthermore, emerging evidence indicates that NMU interacts with related peptides such as neuromedin S (NMS) and may recruit additional, yet uncharacterised receptors, underscoring the complexity of this neuroendocrine system. Taken together, NMU constitutes a key integrator of homeostatic mechanisms that coordinate nutrient sensing, energy allocation and adaptive responses to metabolic challenge.

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Neuromedin U Signaling in Energy Homeostasis and Metabolism publication trend

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Technical terms

Neuropeptide: A small protein-like molecule released by neurons to modulate neuronal and endocrine functions.

G protein–coupled receptor (GPCR): A cell-surface receptor family that transduces extracellular signals through G proteins to regulate intracellular pathways.

Ventromedial hypothalamic nucleus (VMH): A hypothalamic region critical for satiety signalling and energy expenditure.

Anorexigenic: Describing factors that suppress appetite and reduce food intake.

References

1. Neuroanatomical characterization of the Nmu-Cre knock-in mice reveals an interconnected network of unique neuropeptidergic cells. Open Biology (2023).
2. Neuromedins NMU and NMS: An Updated Overview of Their Functions. Frontiers in Endocrinology (2021).
3. Identification and Characterization of Two Neuromedin U Receptors Differentially Expressed in Peripheral Tissues and the Central Nervous System*. Journal of Biological Chemistry (2000).
4. Neuromedin U, a Key Molecule in Metabolic Disorders. International Journal of Molecular Sciences (2021).