Mechanisms of Ion Transport across the Mouse Retinal Pigment Epithelium Measured in Vitro
Funding Information: Supported by grants from The Icelandic Research Council, University of Iceland Research Fund, and The Helga Jónsdot-tir and Sigurlidi Kristjánsson Memorial Fund. Publisher Copyright: © 2020 Association for Research in Vision and Ophthalmology Inc. All rights reserved. PURPOSE. T...
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ftopinvisindi:oai:opinvisindi.is:20.500.11815/3306 2023-11-12T04:19:38+01:00 Mechanisms of Ion Transport across the Mouse Retinal Pigment Epithelium Measured in Vitro Skarphedinsdottir, Sunna Bjorg Eysteinsson, Þór Árnason, Sighvatur Sævar Faculty of Medicine Other departments Landspitali - The National University Hospital of Iceland 2020-06 2128431 https://hdl.handle.net/20.500.11815/3306 https://doi.org/10.1167/IOVS.61.6.31 en eng Investigative Ophthalmology and Visual Science; 61(6) http://www.scopus.com/inward/record.url?scp=85086623966&partnerID=8YFLogxK Skarphedinsdottir , S B , Eysteinsson , Þ & Árnason , S S 2020 , ' Mechanisms of Ion Transport across the Mouse Retinal Pigment Epithelium Measured in Vitro ' , Investigative Ophthalmology and Visual Science , vol. 61 , no. 6 , 31 . https://doi.org/10.1167/IOVS.61.6.31 0146-0404 37504086 0242f0da-f364-4f73-afb8-fef20a9a631c 85086623966 32539134 https://hdl.handle.net/20.500.11815/3306 doi:10.1167/IOVS.61.6.31 info:eu-repo/semantics/openAccess Augnlækningar Ion transport Mouse NaK-ATPase Retinal pigment epithelium Ussing Ophthalmology Sensory Systems Cellular and Molecular Neuroscience /dk/atira/pure/researchoutput/researchoutputtypes/contributiontojournal/article 2020 ftopinvisindi https://doi.org/20.500.11815/330610.1167/IOVS.61.6.31 2023-11-01T23:55:20Z Funding Information: Supported by grants from The Icelandic Research Council, University of Iceland Research Fund, and The Helga Jónsdot-tir and Sigurlidi Kristjánsson Memorial Fund. Publisher Copyright: © 2020 Association for Research in Vision and Ophthalmology Inc. All rights reserved. PURPOSE. To examine ion transport across the mouse retinal pigment epithelium (RPE), measured by the short-circuit current (ISC) and transepithelial resistance (TER). METHODS. Sheets of RPE from mice (C57BL6/J) with retina, choroid, and sclera attached were mounted in Ussing chambers (0.031-cm2 aperture) and Krebs solution. The ISC and TER were recorded with voltage clamps. Receptors implicated in ion transport were blocked or stimulated by ligands applied to both sides. RESULTS. The mean initial ISC was −12.0 ± 3.9 μA/cm2 (basolateral negative), and mean TER was 67.1 ± 8.0 ohm·cm2. RPE preparations remained stable for 3 hours, with ISC decreasing by 0.078 ± 0,033 μA/cm2/hr. Adenosine triphosphate (100 μM) increased ISC by 2.22 ± 0.41 μA/cm2 (P = 0.003). Epinephrine (100 μM) increased ISC by 1.14 ± 0.19 μA/cm2 (P = 0.011). Bumetanide (100 μM) reduced ISC by 1.72 ± 0.73 μA/cm2 (P = 0.027). Ouabain (1 mM) induced a biphasic response: an ISC increase from −7.9 ± 2.4 to −15.49 ± 2.12 μA/cm2 and then a decrease to −3.7 ± 2.2 μA/cm2. Ouabain increased TER by 15.3 ± 4.8 ohm·cm2. These compounds were added sequentially. Apical [K+]o at zero mM transiently increased ISC by 3.36 ± 1.06 μA/cm2. Ba++ decreased ISC from −10.4 ± 3.1 to −6.6 ± 1.8 μA/cm2 (P = 0.01). Ba++ reversed the K+-free response, with Isc decreasing further from −5.65 ± 1.24 to −3.37 ± 0.79 μA/cm2 (P = 0.029). CONCLUSIONS. The ISC and TER can be recorded from the mouse RPE for 3 hours. Adrenergic and purinergic receptors affect murine RPE ion transport. Sodium–potassium adenosine triphosphatase plays a role in net ion transport across mouse RPE, and Na-K-2Cl cotransporter activity partly accounts for transepithelial ion transport. Mimicking light-induced changes, low ... Article in Journal/Newspaper Iceland Opin vísindi (Iceland) Krebs ENVELOPE(-61.467,-61.467,-64.633,-64.633) Investigative Opthalmology & Visual Science 61 6 31 |
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Opin vísindi (Iceland) |
op_collection_id |
ftopinvisindi |
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English |
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Augnlækningar Ion transport Mouse NaK-ATPase Retinal pigment epithelium Ussing Ophthalmology Sensory Systems Cellular and Molecular Neuroscience |
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Augnlækningar Ion transport Mouse NaK-ATPase Retinal pigment epithelium Ussing Ophthalmology Sensory Systems Cellular and Molecular Neuroscience Skarphedinsdottir, Sunna Bjorg Eysteinsson, Þór Árnason, Sighvatur Sævar Mechanisms of Ion Transport across the Mouse Retinal Pigment Epithelium Measured in Vitro |
topic_facet |
Augnlækningar Ion transport Mouse NaK-ATPase Retinal pigment epithelium Ussing Ophthalmology Sensory Systems Cellular and Molecular Neuroscience |
description |
Funding Information: Supported by grants from The Icelandic Research Council, University of Iceland Research Fund, and The Helga Jónsdot-tir and Sigurlidi Kristjánsson Memorial Fund. Publisher Copyright: © 2020 Association for Research in Vision and Ophthalmology Inc. All rights reserved. PURPOSE. To examine ion transport across the mouse retinal pigment epithelium (RPE), measured by the short-circuit current (ISC) and transepithelial resistance (TER). METHODS. Sheets of RPE from mice (C57BL6/J) with retina, choroid, and sclera attached were mounted in Ussing chambers (0.031-cm2 aperture) and Krebs solution. The ISC and TER were recorded with voltage clamps. Receptors implicated in ion transport were blocked or stimulated by ligands applied to both sides. RESULTS. The mean initial ISC was −12.0 ± 3.9 μA/cm2 (basolateral negative), and mean TER was 67.1 ± 8.0 ohm·cm2. RPE preparations remained stable for 3 hours, with ISC decreasing by 0.078 ± 0,033 μA/cm2/hr. Adenosine triphosphate (100 μM) increased ISC by 2.22 ± 0.41 μA/cm2 (P = 0.003). Epinephrine (100 μM) increased ISC by 1.14 ± 0.19 μA/cm2 (P = 0.011). Bumetanide (100 μM) reduced ISC by 1.72 ± 0.73 μA/cm2 (P = 0.027). Ouabain (1 mM) induced a biphasic response: an ISC increase from −7.9 ± 2.4 to −15.49 ± 2.12 μA/cm2 and then a decrease to −3.7 ± 2.2 μA/cm2. Ouabain increased TER by 15.3 ± 4.8 ohm·cm2. These compounds were added sequentially. Apical [K+]o at zero mM transiently increased ISC by 3.36 ± 1.06 μA/cm2. Ba++ decreased ISC from −10.4 ± 3.1 to −6.6 ± 1.8 μA/cm2 (P = 0.01). Ba++ reversed the K+-free response, with Isc decreasing further from −5.65 ± 1.24 to −3.37 ± 0.79 μA/cm2 (P = 0.029). CONCLUSIONS. The ISC and TER can be recorded from the mouse RPE for 3 hours. Adrenergic and purinergic receptors affect murine RPE ion transport. Sodium–potassium adenosine triphosphatase plays a role in net ion transport across mouse RPE, and Na-K-2Cl cotransporter activity partly accounts for transepithelial ion transport. Mimicking light-induced changes, low ... |
author2 |
Faculty of Medicine Other departments Landspitali - The National University Hospital of Iceland |
format |
Article in Journal/Newspaper |
author |
Skarphedinsdottir, Sunna Bjorg Eysteinsson, Þór Árnason, Sighvatur Sævar |
author_facet |
Skarphedinsdottir, Sunna Bjorg Eysteinsson, Þór Árnason, Sighvatur Sævar |
author_sort |
Skarphedinsdottir, Sunna Bjorg |
title |
Mechanisms of Ion Transport across the Mouse Retinal Pigment Epithelium Measured in Vitro |
title_short |
Mechanisms of Ion Transport across the Mouse Retinal Pigment Epithelium Measured in Vitro |
title_full |
Mechanisms of Ion Transport across the Mouse Retinal Pigment Epithelium Measured in Vitro |
title_fullStr |
Mechanisms of Ion Transport across the Mouse Retinal Pigment Epithelium Measured in Vitro |
title_full_unstemmed |
Mechanisms of Ion Transport across the Mouse Retinal Pigment Epithelium Measured in Vitro |
title_sort |
mechanisms of ion transport across the mouse retinal pigment epithelium measured in vitro |
publishDate |
2020 |
url |
https://hdl.handle.net/20.500.11815/3306 https://doi.org/10.1167/IOVS.61.6.31 |
long_lat |
ENVELOPE(-61.467,-61.467,-64.633,-64.633) |
geographic |
Krebs |
geographic_facet |
Krebs |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
Investigative Ophthalmology and Visual Science; 61(6) http://www.scopus.com/inward/record.url?scp=85086623966&partnerID=8YFLogxK Skarphedinsdottir , S B , Eysteinsson , Þ & Árnason , S S 2020 , ' Mechanisms of Ion Transport across the Mouse Retinal Pigment Epithelium Measured in Vitro ' , Investigative Ophthalmology and Visual Science , vol. 61 , no. 6 , 31 . https://doi.org/10.1167/IOVS.61.6.31 0146-0404 37504086 0242f0da-f364-4f73-afb8-fef20a9a631c 85086623966 32539134 https://hdl.handle.net/20.500.11815/3306 doi:10.1167/IOVS.61.6.31 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/20.500.11815/330610.1167/IOVS.61.6.31 |
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Investigative Opthalmology & Visual Science |
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61 |
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6 |
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31 |
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1782335996677849088 |