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Hypothalamic actions of neuromedin U
A M Wren1, C J Small, C R Abbott
1Endocrine Unit, Faculty of Medicine, Imperial College, London W12 0NN, United Kingdom.
Endocrinology
|October 26, 2002
Summary
Neuromedin U (NMU) is a peptide that inhibits feeding. This study found NMU in the paraventricular nucleus (PVN) stimulates the stress axis, increases activity, and reduces food intake.
Area of Science:
- Neuroendocrinology
- Behavioral Neuroscience
- Peptide Signaling
Background:
- Neuromedin U (NMU) is a peptide hormone found in the central nervous system and gut.
- Previous research indicates NMU inhibits feeding following central administration.
- The specific hypothalamic actions of NMU, particularly on the hypothalamo-pituitary-adrenal (HPA) axis, remain to be fully elucidated.
Purpose of the Study:
- To investigate the role of NMU within the hypothalamus in regulating feeding behavior.
- To determine the effects of NMU on the hypothalamo-pituitary-adrenal (HPA) axis.
- To map the specific hypothalamic nuclei through which NMU exerts its effects on feeding.
Main Methods:
- Intracerebroventricular and intra-hypothalamic injections of NMU in rodents.
- Dose-response analysis of NMU's effect on food intake.
- Mapping of NMU's feeding inhibitory sites within eight hypothalamic areas.
- Measurement of plasma ACTH and corticosterone levels.
- In vitro studies using hypothalamic explants to assess CRH and arginine vasopressin release.
- Investigation of leptin-stimulated NMU release.
Main Results:
- Intra-PVN NMU dose-dependently inhibited food intake, with significant effects at 0.1 nmol and robust inhibition at 0.3 nmol.
- NMU injections into the PVN and arcuate nucleus significantly reduced food intake.
- Intra-PVN NMU administration increased grooming and locomotor activity.
- NMU significantly elevated plasma ACTH and corticosterone levels, indicating HPA axis activation.
- In vitro, NMU stimulated the release of CRH and arginine vasopressin from hypothalamic explants.
- Leptin was found to stimulate NMU release from hypothalamic explants.
Conclusions:
- NMU acts within the PVN to inhibit feeding behavior.
- NMU stimulates the HPA axis, leading to increased ACTH and corticosterone.
- NMU influences locomotor and grooming behaviors.
- These findings reveal a novel role for NMU in the PVN, integrating feeding regulation with stress and activity responses.
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