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Collective and individual functions of leptin receptor modulated neurons controlling metabolism and ingestion.

ABSTRACT: Two known types of leptin-responsive neurons reside within the arcuate nucleus: the agouti gene-related peptide (AgRP)/neuropeptide Y (NPY) neuron and the proopiomelanocortin (POMC) neuron. By deleting the leptin receptor gene (Lepr) specifically in AgRP/NPY and/or POMC neurons of mice, we examined the several and combined contributions of these neurons to leptin action. Body weight and adiposity were increased by Lepr deletion from AgRP and POMC neurons individually, and simultaneous deletion in both neurons (A+P LEPR-KO mice) further increased these measures. Young (periweaning) A+P LEPR-KO mice exhibit hyperphagia and decreased energy expenditure, with increased weight gain, oxidative sparing of triglycerides, and increased fat accumulation. Interestingly, however, many of these abnormalities were attenuated in adult animals, and high doses of leptin partially suppress food intake in the A+P LEPR-KO mice. Although mildly hyperinsulinemic, the A+P LEPR-KO mice displayed normal glucose tolerance and fertility. Thus, AgRP/NPY and POMC neurons each play mandatory roles in aspects of leptin-regulated energy homeostasis, high leptin levels in adult mice mitigate the importance of leptin-responsiveness in these neurons for components of energy balance, suggesting the presence of other leptin-regulated pathways that partially compensate for the lack of leptin action on the POMC and AgRP/NPY neurons.

SUBMITTER: van de Wall E

PROVIDER: S-EPMC2276717 | biostudies-literature | 2008 Apr

REPOSITORIES: biostudies-literature

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Collective and individual functions of leptin receptor modulated neurons controlling metabolism and ingestion.

van de Wall Esther E Leshan Rebecca R Xu Allison W AW Balthasar Nina N Coppari Roberto R Liu Shun Mei SM Jo Young Hwan YH MacKenzie Robert G RG Allison David B DB Dun Nae J NJ Elmquist Joel J Lowell Bradford B BB Barsh Gregory S GS de Luca Carl C Myers Martin G MG Schwartz Gary J GJ Chua Streamson C SC

Endocrinology 20071227 4

Two known types of leptin-responsive neurons reside within the arcuate nucleus: the agouti gene-related peptide (AgRP)/neuropeptide Y (NPY) neuron and the proopiomelanocortin (POMC) neuron. By deleting the leptin receptor gene (Lepr) specifically in AgRP/NPY and/or POMC neurons of mice, we examined the several and combined contributions of these neurons to leptin action. Body weight and adiposity were increased by Lepr deletion from AgRP and POMC neurons individually, and simultaneous deletion i ...[more]

PMID: 18162515

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Collective and individual functions of leptin receptor modulated neurons controlling metabolism and ingestion.

Publications

Collective and individual functions of leptin receptor modulated neurons controlling metabolism and ingestion.

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