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ATP-mediated glucosensing by hypothalamic tanycytes

ABSTRACT: The brain plays a vital role in the regulation of food intake, appetite and ultimately bodyweight. Neurons in the hypothalamic arcuate nucleus, the ventromedial hypothalamic nuclei (VMH) and the lateral hypothalamus are sensitive to a number of circulating signals such as leptin, grehlin,...

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Detalles Bibliográficos
Autores principales: Frayling, Cameron, Britton, Ruth, Dale, Nicholas
Formato: Texto
Lenguaje:English
Publicado: Blackwell Science Inc 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3098703/
https://www.ncbi.nlm.nih.gov/pubmed/21486800
http://dx.doi.org/10.1113/jphysiol.2010.202051
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author Frayling, Cameron
Britton, Ruth
Dale, Nicholas
author_facet Frayling, Cameron
Britton, Ruth
Dale, Nicholas
author_sort Frayling, Cameron
collection PubMed
description ABSTRACT: The brain plays a vital role in the regulation of food intake, appetite and ultimately bodyweight. Neurons in the hypothalamic arcuate nucleus, the ventromedial hypothalamic nuclei (VMH) and the lateral hypothalamus are sensitive to a number of circulating signals such as leptin, grehlin, insulin and glucose. These neurons are part of a network that integrates this information to regulate feeding and appetite. Hypothalamic tanycytes contact the cerebral spinal fluid of the third ventricle and send processes into the parenchyma. A subset of tanycytes are located close to, and send processes towards, the hypothalamic nuclei that contain neurons that are glucosensitive and are involved in the regulation of feeding. Nevertheless the signalling properties of tanycytes remain largely unstudied. We now demonstrate that tanycytes signal via waves of intracellular Ca(2+); they respond strongly to ATP, histamine and acetylcholine – transmitters associated with the drive to feed. Selective stimulation by glucose of tanycyte cell bodies evokes robust ATP-mediated Ca(2+) responses. Tanycytes release ATP in response to glucose. Furthermore tanycytes also respond to non-metabolisable analogues of glucose. Although tanycytes have been proposed as glucosensors, our study provides the first direct demonstration of this hypothesis. Tanycytes must therefore now be considered as active signalling cells within the brain that can respond to a number of neuronally derived and circulating transmitters and metabolites.
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spelling pubmed-30987032012-01-27 ATP-mediated glucosensing by hypothalamic tanycytes Frayling, Cameron Britton, Ruth Dale, Nicholas J Physiol Neuroscience ABSTRACT: The brain plays a vital role in the regulation of food intake, appetite and ultimately bodyweight. Neurons in the hypothalamic arcuate nucleus, the ventromedial hypothalamic nuclei (VMH) and the lateral hypothalamus are sensitive to a number of circulating signals such as leptin, grehlin, insulin and glucose. These neurons are part of a network that integrates this information to regulate feeding and appetite. Hypothalamic tanycytes contact the cerebral spinal fluid of the third ventricle and send processes into the parenchyma. A subset of tanycytes are located close to, and send processes towards, the hypothalamic nuclei that contain neurons that are glucosensitive and are involved in the regulation of feeding. Nevertheless the signalling properties of tanycytes remain largely unstudied. We now demonstrate that tanycytes signal via waves of intracellular Ca(2+); they respond strongly to ATP, histamine and acetylcholine – transmitters associated with the drive to feed. Selective stimulation by glucose of tanycyte cell bodies evokes robust ATP-mediated Ca(2+) responses. Tanycytes release ATP in response to glucose. Furthermore tanycytes also respond to non-metabolisable analogues of glucose. Although tanycytes have been proposed as glucosensors, our study provides the first direct demonstration of this hypothesis. Tanycytes must therefore now be considered as active signalling cells within the brain that can respond to a number of neuronally derived and circulating transmitters and metabolites. Blackwell Science Inc 2011-05-01 2011-03-08 /pmc/articles/PMC3098703/ /pubmed/21486800 http://dx.doi.org/10.1113/jphysiol.2010.202051 Text en Journal compilation © 2011 The Physiological Society
spellingShingle Neuroscience
Frayling, Cameron
Britton, Ruth
Dale, Nicholas
ATP-mediated glucosensing by hypothalamic tanycytes
title ATP-mediated glucosensing by hypothalamic tanycytes
title_full ATP-mediated glucosensing by hypothalamic tanycytes
title_fullStr ATP-mediated glucosensing by hypothalamic tanycytes
title_full_unstemmed ATP-mediated glucosensing by hypothalamic tanycytes
title_short ATP-mediated glucosensing by hypothalamic tanycytes
title_sort atp-mediated glucosensing by hypothalamic tanycytes
topic Neuroscience
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3098703/
https://www.ncbi.nlm.nih.gov/pubmed/21486800
http://dx.doi.org/10.1113/jphysiol.2010.202051
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