Submucosal enteric neurons of the cavine distal colon are sensitive to hypoosmolar stimuli

Key points Neurons of the enteric submucous plexus are challenged by osmolar fluctuations during digestion and absorption of nutrients. Central neurons are very sensitive to changes in osmolality but knowledge on that issue related to enteric neurons is sparse. The present study focuses on investiga...

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Veröffentlicht in:The Journal of physiology 2020-12, Vol.598 (23), p.5317-5332
Hauptverfasser: Kollmann, Patrick, Elfers, Kristin, Maurer, Stefanie, Klingenspor, Martin, Schemann, Michael, Mazzuoli‐Weber, Gemma
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container_issue 23
container_start_page 5317
container_title The Journal of physiology
container_volume 598
creator Kollmann, Patrick
Elfers, Kristin
Maurer, Stefanie
Klingenspor, Martin
Schemann, Michael
Mazzuoli‐Weber, Gemma
description Key points Neurons of the enteric submucous plexus are challenged by osmolar fluctuations during digestion and absorption of nutrients. Central neurons are very sensitive to changes in osmolality but knowledge on that issue related to enteric neurons is sparse. The present study focuses on investigation of osmosensitivity of submucosal neurons including potential molecular mediating mechanisms. Results show that submucosal neurons respond to hypoosmolar stimuli with increased activity which is partially mediated by the transient receptor potential vanilloid 4 channel. We provided important information on osmosensitive properties of enteric neurons. These data are fundamental to better explain the nerve‐mediated control of the gastrointestinal functions during physiological and pathophysiological (diarrhoea) conditions. Enteric neurons are located inside the gut wall, where they are confronted with changes in osmolality during (inter‐) digestive periods. In particular, neurons of the submucous plexus (SMP), located between epithelial cells and blood vessels may sense and respond to osmotic shifts. The present study was conducted to investigate osmosensitivity of enteric submucosal neurons and the potential role of the transient receptor potential vanilloid 4 channel (TRPV4) as a mediator of enteric neuronal osmosensitivity. Therefore, freshly dissected submucosal preparations from guinea pig colon were investigated for osmosensitivity using voltage‐sensitive dye and Ca2+ imaging. Acute hypoosmolar stimuli (final osmolality reached at ganglia of 94, 144 and 194 mOsm kg‐1) were applied to single ganglia using a local perfusion system. Expression of TRPV4 in the SMP was quantified using qRT‐PCR, and GSK1016790A and HC‐067047 were used to activate or block the receptor, respectively, revealing its relevance in enteric osmosensitivity. On average, 11.0 [7.0/17.0] % of submucosal neurons per ganglion responded to the hypoosmolar stimulus. The Ca2+ imaging experiments showed that glia responded to the hypoosmolar stimulus, but with a delay in comparison with neurons. mRNA expression of TRPV4 could be shown in the SMP and blockade of the receptor by HC‐067047 significantly decreased the number of responding neurons (0.0 [0.0/6.3] %) while the TRPV4 agonist GSK1016790A caused action potential discharge in a subpopulation of osmosensitive enteric neurons. The results of the present study provide insight into the osmosensitivity of submucosal enteric neurons and stron
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Central neurons are very sensitive to changes in osmolality but knowledge on that issue related to enteric neurons is sparse. The present study focuses on investigation of osmosensitivity of submucosal neurons including potential molecular mediating mechanisms. Results show that submucosal neurons respond to hypoosmolar stimuli with increased activity which is partially mediated by the transient receptor potential vanilloid 4 channel. We provided important information on osmosensitive properties of enteric neurons. These data are fundamental to better explain the nerve‐mediated control of the gastrointestinal functions during physiological and pathophysiological (diarrhoea) conditions. Enteric neurons are located inside the gut wall, where they are confronted with changes in osmolality during (inter‐) digestive periods. In particular, neurons of the submucous plexus (SMP), located between epithelial cells and blood vessels may sense and respond to osmotic shifts. The present study was conducted to investigate osmosensitivity of enteric submucosal neurons and the potential role of the transient receptor potential vanilloid 4 channel (TRPV4) as a mediator of enteric neuronal osmosensitivity. Therefore, freshly dissected submucosal preparations from guinea pig colon were investigated for osmosensitivity using voltage‐sensitive dye and Ca2+ imaging. Acute hypoosmolar stimuli (final osmolality reached at ganglia of 94, 144 and 194 mOsm kg‐1) were applied to single ganglia using a local perfusion system. Expression of TRPV4 in the SMP was quantified using qRT‐PCR, and GSK1016790A and HC‐067047 were used to activate or block the receptor, respectively, revealing its relevance in enteric osmosensitivity. On average, 11.0 [7.0/17.0] % of submucosal neurons per ganglion responded to the hypoosmolar stimulus. The Ca2+ imaging experiments showed that glia responded to the hypoosmolar stimulus, but with a delay in comparison with neurons. mRNA expression of TRPV4 could be shown in the SMP and blockade of the receptor by HC‐067047 significantly decreased the number of responding neurons (0.0 [0.0/6.3] %) while the TRPV4 agonist GSK1016790A caused action potential discharge in a subpopulation of osmosensitive enteric neurons. The results of the present study provide insight into the osmosensitivity of submucosal enteric neurons and strongly indicate the involvement of TRPV4 as an osmotransducer. Key points Neurons of the enteric submucous plexus are challenged by osmolar fluctuations during digestion and absorption of nutrients. Central neurons are very sensitive to changes in osmolality but knowledge on that issue related to enteric neurons is sparse. The present study focuses on investigation of osmosensitivity of submucosal neurons including potential molecular mediating mechanisms. Results show that submucosal neurons respond to hypoosmolar stimuli with increased activity which is partially mediated by the transient receptor potential vanilloid 4 channel. We provided important information on osmosensitive properties of enteric neurons. These data are fundamental to better explain the nerve‐mediated control of the gastrointestinal functions during physiological and pathophysiological (diarrhoea) conditions.</description><identifier>ISSN: 0022-3751</identifier><identifier>EISSN: 1469-7793</identifier><identifier>DOI: 10.1113/JP280309</identifier><identifier>PMID: 32880976</identifier><language>eng</language><publisher>England: Wiley Subscription Services, Inc</publisher><subject>Action potential ; Animals ; Blood vessels ; Calcium channels (voltage-gated) ; Calcium imaging ; Colon ; Dyes ; Enteric nervous system ; Epithelial cells ; Gene expression ; Guinea Pigs ; Myenteric Plexus ; Neuroglia ; Neurons ; osmosensitivity ; Perfusion ; submucosal enteric neurons ; Submucosal plexus ; Submucous Plexus ; Transient receptor potential proteins ; TRPV4</subject><ispartof>The Journal of physiology, 2020-12, Vol.598 (23), p.5317-5332</ispartof><rights>2020 The Authors. published by John Wiley &amp; Sons Ltd on behalf of The Physiological Society.</rights><rights>2020 The Authors. 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The present study was conducted to investigate osmosensitivity of enteric submucosal neurons and the potential role of the transient receptor potential vanilloid 4 channel (TRPV4) as a mediator of enteric neuronal osmosensitivity. Therefore, freshly dissected submucosal preparations from guinea pig colon were investigated for osmosensitivity using voltage‐sensitive dye and Ca2+ imaging. Acute hypoosmolar stimuli (final osmolality reached at ganglia of 94, 144 and 194 mOsm kg‐1) were applied to single ganglia using a local perfusion system. Expression of TRPV4 in the SMP was quantified using qRT‐PCR, and GSK1016790A and HC‐067047 were used to activate or block the receptor, respectively, revealing its relevance in enteric osmosensitivity. On average, 11.0 [7.0/17.0] % of submucosal neurons per ganglion responded to the hypoosmolar stimulus. 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Central neurons are very sensitive to changes in osmolality but knowledge on that issue related to enteric neurons is sparse. The present study focuses on investigation of osmosensitivity of submucosal neurons including potential molecular mediating mechanisms. Results show that submucosal neurons respond to hypoosmolar stimuli with increased activity which is partially mediated by the transient receptor potential vanilloid 4 channel. We provided important information on osmosensitive properties of enteric neurons. These data are fundamental to better explain the nerve‐mediated control of the gastrointestinal functions during physiological and pathophysiological (diarrhoea) conditions. Enteric neurons are located inside the gut wall, where they are confronted with changes in osmolality during (inter‐) digestive periods. In particular, neurons of the submucous plexus (SMP), located between epithelial cells and blood vessels may sense and respond to osmotic shifts. The present study was conducted to investigate osmosensitivity of enteric submucosal neurons and the potential role of the transient receptor potential vanilloid 4 channel (TRPV4) as a mediator of enteric neuronal osmosensitivity. Therefore, freshly dissected submucosal preparations from guinea pig colon were investigated for osmosensitivity using voltage‐sensitive dye and Ca2+ imaging. Acute hypoosmolar stimuli (final osmolality reached at ganglia of 94, 144 and 194 mOsm kg‐1) were applied to single ganglia using a local perfusion system. Expression of TRPV4 in the SMP was quantified using qRT‐PCR, and GSK1016790A and HC‐067047 were used to activate or block the receptor, respectively, revealing its relevance in enteric osmosensitivity. On average, 11.0 [7.0/17.0] % of submucosal neurons per ganglion responded to the hypoosmolar stimulus. The Ca2+ imaging experiments showed that glia responded to the hypoosmolar stimulus, but with a delay in comparison with neurons. mRNA expression of TRPV4 could be shown in the SMP and blockade of the receptor by HC‐067047 significantly decreased the number of responding neurons (0.0 [0.0/6.3] %) while the TRPV4 agonist GSK1016790A caused action potential discharge in a subpopulation of osmosensitive enteric neurons. The results of the present study provide insight into the osmosensitivity of submucosal enteric neurons and strongly indicate the involvement of TRPV4 as an osmotransducer. Key points Neurons of the enteric submucous plexus are challenged by osmolar fluctuations during digestion and absorption of nutrients. Central neurons are very sensitive to changes in osmolality but knowledge on that issue related to enteric neurons is sparse. The present study focuses on investigation of osmosensitivity of submucosal neurons including potential molecular mediating mechanisms. Results show that submucosal neurons respond to hypoosmolar stimuli with increased activity which is partially mediated by the transient receptor potential vanilloid 4 channel. We provided important information on osmosensitive properties of enteric neurons. These data are fundamental to better explain the nerve‐mediated control of the gastrointestinal functions during physiological and pathophysiological (diarrhoea) conditions.</abstract><cop>England</cop><pub>Wiley Subscription Services, Inc</pub><pmid>32880976</pmid><doi>10.1113/JP280309</doi><tpages>16</tpages><orcidid>https://orcid.org/0000-0002-4502-6664</orcidid><orcidid>https://orcid.org/0000-0001-7803-3556</orcidid><oa>free_for_read</oa></addata></record>
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subjects Action potential
Animals
Blood vessels
Calcium channels (voltage-gated)
Calcium imaging
Colon
Dyes
Enteric nervous system
Epithelial cells
Gene expression
Guinea Pigs
Myenteric Plexus
Neuroglia
Neurons
osmosensitivity
Perfusion
submucosal enteric neurons
Submucosal plexus
Submucous Plexus
Transient receptor potential proteins
TRPV4
title Submucosal enteric neurons of the cavine distal colon are sensitive to hypoosmolar stimuli
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