Permeability to water in a tight epithelium: Possible modulating action of gap junctions
- Autores
- Orce, Gabriel Guillermo F.; Castillo, Graciela Alicia; Chanampa, Yolanda; Bellomio, Augusto
- Año de publicación
- 2004
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Osmotic water flow (Jw) across tight distal nephron epithelial membranes increases upon exposure to vasopressin: following binding of the hormone to its receptors, intracellular cyclic AMP concentration increases, leading to insertion of aquaporins in the apical membrane. The involvement of intercellular communication in the process, however, has not been adequately explored. Octanol, 1.2 × 10-3 M, a gap junction inhibitor, significantly reduced Jw (expressed as mg·20 min-1) in isolated toad urinary bladders (a model of the distal nephron) subjected to a transepithelial osmotic gradient and exposed to agents mimicking the vasopressin-triggered mechanism: oxytocin, 50 mIU·mL-1 (from 185.3 ± 28.0, P < 0.001, to 69.0 ± 23.6, P < 0.05; Pdiff < 0.01, n = 6), and cyclic AMP, 2.5 × 10-3 M (from 98.0 ± 32.6, P < 0.02, to 31.0 ± 13.9, NS; Pdiff < 0.05, n = 12), without altering the effect of nystatin, 450 U·mL-1, which increases Jw via a mechanism unrelated to apical aquaporin insertion (163.2 ± 16.3, P < 0.001, in controls vs. 150.3 ± 10.4, P < 0.001, in octanol-treated bladders; Pdiff: NS, n = 6). Another gap junction blocker, carbenoxolone, 2.0 × 10-4 M (CBX), exerted similar effects on the responses to oxytocin, 100 mIU·mL-1, reducing the response from 256.7 ± 33.6, P < 0.001, to 102.7 ± 10.4, P < 0.001; Pdiff < 0.01, n = 6) and nystatin, which was unaffected (95.0 ± 20.9, P < 0.01, vs. 132.0 ± 27.0, P < 0.01; Pdiff: NS, n = 6). Our results suggest that either gap junctions or, alternatively, unapposed gap junction hemichannels, may be important in the regulation of Jw in the isolated toad bladder, by modulating a step in the physiological process leading to increased apical membrane permeability.
Le débit d’eau (Jw) osmotique à travers les membranes épithéliales du néphron distal augmente de lors l’exposition à la vasopressine : après la fixation de l’hormone à ses récepteurs, la concentration d’AMP cyclique intracellulaire augmente, favorisant l’insertion d’aquaporines dans la membrane apicale. Toutefois, le rôle de la communication intercellulaire dans le processus est encore mal connu. L’octanol, 1,2 × 10–3 M, un inhibiteur de jonctions lacunaires, a significativement réduit Jw (exprimé en mg·20 min–1) dans les vessies urinaires isolées de crapauds (un modèle de néphron distal) soumises à un gradient osmotique transépithélial et exposées à des agents reproduisant le mécanisme déclenché par la vasopressine : l’ocytocine, 50 mUI·mL–1 (de 185,3 ± 28,0, P < 0,001, à 69,0 ± 23,6, P < 0,05; Pdiff < 0,01, n = 6), et l’AMP cyclique, 2,5 × 10–3 M (de 98,0 ± 32,6, P < 0,02, à 31,0 ± 13,9, NS; Pdiff <0,05, n = 12) sans modifier l’effet de la nystatine, 450 U·mL–1, qui augmente Jw par un mécanisme indépendant de l’insertion apicale des aquaporines (163,2 ± 16,3, P < 0,001, dans les vessies témoins, vs 150,3 ± 10,4, P < 0,001, dans les vessies traitées à l’octanol; Pdiff : NS, n = 6). Une autre bloqueur de jonctions lacunaires, carbenoloxone, 2,0 × 10–4 M (CBX), a eu des effets similaires sur les réponses à l’ocytocine, 100 mUI·mL–1, réduisant la réponse de 256,7 ± 33,6, P < 0,001, à 102,7 ± 10,4, P < 0,001; Pdiff < 0,01, n = 6) et à la nystatine, qui n’a pas été affectée (95,0 ± 20,9, P < 0,01, vs 132,0 ± 27,0, P < 0,01; Pdiff: NS, n = 6). Nos résultats donnent à penser que les jonctions lacunaires, ou des demi-canaux non jonctionnels, pourraient jouer un rôle important dans la régulation du Jw dans la vessie isolée du crapaud, en modulant une étape dans le processus physiologique favorisant une augmentation de la perméabilité de la membrane apicale.
Fil: Orce, Gabriel Guillermo F.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; Argentina
Fil: Castillo, Graciela Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; Argentina
Fil: Chanampa, Yolanda. Universidad Nacional de Tucumán. Facultad de Medicina; Argentina
Fil: Bellomio, Augusto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; Argentina - Materia
-
BUFO ARENARUM
TOAD URINARY BLADDER
WATER FLOW
EPITHELIAL PERMEABILITY
N-OCTANOL
CARBENOXOLONE
VESSIE URINAIRE DE CRAPAUD - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
.jpg)
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/99472
Ver los metadatos del registro completo
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Permeability to water in a tight epithelium: Possible modulating action of gap junctionsOrce, Gabriel Guillermo F.Castillo, Graciela AliciaChanampa, YolandaBellomio, AugustoBUFO ARENARUMTOAD URINARY BLADDERWATER FLOWEPITHELIAL PERMEABILITYN-OCTANOLCARBENOXOLONEVESSIE URINAIRE DE CRAPAUDhttps://purl.org/becyt/ford/3.1https://purl.org/becyt/ford/3Osmotic water flow (Jw) across tight distal nephron epithelial membranes increases upon exposure to vasopressin: following binding of the hormone to its receptors, intracellular cyclic AMP concentration increases, leading to insertion of aquaporins in the apical membrane. The involvement of intercellular communication in the process, however, has not been adequately explored. Octanol, 1.2 × 10-3 M, a gap junction inhibitor, significantly reduced Jw (expressed as mg·20 min-1) in isolated toad urinary bladders (a model of the distal nephron) subjected to a transepithelial osmotic gradient and exposed to agents mimicking the vasopressin-triggered mechanism: oxytocin, 50 mIU·mL-1 (from 185.3 ± 28.0, P < 0.001, to 69.0 ± 23.6, P < 0.05; Pdiff < 0.01, n = 6), and cyclic AMP, 2.5 × 10-3 M (from 98.0 ± 32.6, P < 0.02, to 31.0 ± 13.9, NS; Pdiff < 0.05, n = 12), without altering the effect of nystatin, 450 U·mL-1, which increases Jw via a mechanism unrelated to apical aquaporin insertion (163.2 ± 16.3, P < 0.001, in controls vs. 150.3 ± 10.4, P < 0.001, in octanol-treated bladders; Pdiff: NS, n = 6). Another gap junction blocker, carbenoxolone, 2.0 × 10-4 M (CBX), exerted similar effects on the responses to oxytocin, 100 mIU·mL-1, reducing the response from 256.7 ± 33.6, P < 0.001, to 102.7 ± 10.4, P < 0.001; Pdiff < 0.01, n = 6) and nystatin, which was unaffected (95.0 ± 20.9, P < 0.01, vs. 132.0 ± 27.0, P < 0.01; Pdiff: NS, n = 6). Our results suggest that either gap junctions or, alternatively, unapposed gap junction hemichannels, may be important in the regulation of Jw in the isolated toad bladder, by modulating a step in the physiological process leading to increased apical membrane permeability.Le débit d’eau (Jw) osmotique à travers les membranes épithéliales du néphron distal augmente de lors l’exposition à la vasopressine : après la fixation de l’hormone à ses récepteurs, la concentration d’AMP cyclique intracellulaire augmente, favorisant l’insertion d’aquaporines dans la membrane apicale. Toutefois, le rôle de la communication intercellulaire dans le processus est encore mal connu. L’octanol, 1,2 × 10–3 M, un inhibiteur de jonctions lacunaires, a significativement réduit Jw (exprimé en mg·20 min–1) dans les vessies urinaires isolées de crapauds (un modèle de néphron distal) soumises à un gradient osmotique transépithélial et exposées à des agents reproduisant le mécanisme déclenché par la vasopressine : l’ocytocine, 50 mUI·mL–1 (de 185,3 ± 28,0, P < 0,001, à 69,0 ± 23,6, P < 0,05; Pdiff < 0,01, n = 6), et l’AMP cyclique, 2,5 × 10–3 M (de 98,0 ± 32,6, P < 0,02, à 31,0 ± 13,9, NS; Pdiff <0,05, n = 12) sans modifier l’effet de la nystatine, 450 U·mL–1, qui augmente Jw par un mécanisme indépendant de l’insertion apicale des aquaporines (163,2 ± 16,3, P < 0,001, dans les vessies témoins, vs 150,3 ± 10,4, P < 0,001, dans les vessies traitées à l’octanol; Pdiff : NS, n = 6). Une autre bloqueur de jonctions lacunaires, carbenoloxone, 2,0 × 10–4 M (CBX), a eu des effets similaires sur les réponses à l’ocytocine, 100 mUI·mL–1, réduisant la réponse de 256,7 ± 33,6, P < 0,001, à 102,7 ± 10,4, P < 0,001; Pdiff < 0,01, n = 6) et à la nystatine, qui n’a pas été affectée (95,0 ± 20,9, P < 0,01, vs 132,0 ± 27,0, P < 0,01; Pdiff: NS, n = 6). Nos résultats donnent à penser que les jonctions lacunaires, ou des demi-canaux non jonctionnels, pourraient jouer un rôle important dans la régulation du Jw dans la vessie isolée du crapaud, en modulant une étape dans le processus physiologique favorisant une augmentation de la perméabilité de la membrane apicale.Fil: Orce, Gabriel Guillermo F.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; ArgentinaFil: Castillo, Graciela Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; ArgentinaFil: Chanampa, Yolanda. Universidad Nacional de Tucumán. Facultad de Medicina; ArgentinaFil: Bellomio, Augusto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; ArgentinaNational Research Council Canada-NRC Research Press2004-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/99472Orce, Gabriel Guillermo F.; Castillo, Graciela Alicia; Chanampa, Yolanda; Bellomio, Augusto; Permeability to water in a tight epithelium: Possible modulating action of gap junctions; National Research Council Canada-NRC Research Press; Canadian Journal Of Physiology And Pharmacology; 82; 6; 6-2004; 417-4210008-42121205-7541CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1139/y04-037info:eu-repo/semantics/altIdentifier/url/https://www.nrcresearchpress.com/doi/10.1139/y04-037#.Xix2rE8zZdginfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T12:08:14Zoai:ri.conicet.gov.ar:11336/99472instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-22 12:08:14.519CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
| dc.title.none.fl_str_mv |
Permeability to water in a tight epithelium: Possible modulating action of gap junctions |
| title |
Permeability to water in a tight epithelium: Possible modulating action of gap junctions |
| spellingShingle |
Permeability to water in a tight epithelium: Possible modulating action of gap junctions Orce, Gabriel Guillermo F. BUFO ARENARUM TOAD URINARY BLADDER WATER FLOW EPITHELIAL PERMEABILITY N-OCTANOL CARBENOXOLONE VESSIE URINAIRE DE CRAPAUD |
| title_short |
Permeability to water in a tight epithelium: Possible modulating action of gap junctions |
| title_full |
Permeability to water in a tight epithelium: Possible modulating action of gap junctions |
| title_fullStr |
Permeability to water in a tight epithelium: Possible modulating action of gap junctions |
| title_full_unstemmed |
Permeability to water in a tight epithelium: Possible modulating action of gap junctions |
| title_sort |
Permeability to water in a tight epithelium: Possible modulating action of gap junctions |
| dc.creator.none.fl_str_mv |
Orce, Gabriel Guillermo F. Castillo, Graciela Alicia Chanampa, Yolanda Bellomio, Augusto |
| author |
Orce, Gabriel Guillermo F. |
| author_facet |
Orce, Gabriel Guillermo F. Castillo, Graciela Alicia Chanampa, Yolanda Bellomio, Augusto |
| author_role |
author |
| author2 |
Castillo, Graciela Alicia Chanampa, Yolanda Bellomio, Augusto |
| author2_role |
author author author |
| dc.subject.none.fl_str_mv |
BUFO ARENARUM TOAD URINARY BLADDER WATER FLOW EPITHELIAL PERMEABILITY N-OCTANOL CARBENOXOLONE VESSIE URINAIRE DE CRAPAUD |
| topic |
BUFO ARENARUM TOAD URINARY BLADDER WATER FLOW EPITHELIAL PERMEABILITY N-OCTANOL CARBENOXOLONE VESSIE URINAIRE DE CRAPAUD |
| purl_subject.fl_str_mv |
https://purl.org/becyt/ford/3.1 https://purl.org/becyt/ford/3 |
| dc.description.none.fl_txt_mv |
Osmotic water flow (Jw) across tight distal nephron epithelial membranes increases upon exposure to vasopressin: following binding of the hormone to its receptors, intracellular cyclic AMP concentration increases, leading to insertion of aquaporins in the apical membrane. The involvement of intercellular communication in the process, however, has not been adequately explored. Octanol, 1.2 × 10-3 M, a gap junction inhibitor, significantly reduced Jw (expressed as mg·20 min-1) in isolated toad urinary bladders (a model of the distal nephron) subjected to a transepithelial osmotic gradient and exposed to agents mimicking the vasopressin-triggered mechanism: oxytocin, 50 mIU·mL-1 (from 185.3 ± 28.0, P < 0.001, to 69.0 ± 23.6, P < 0.05; Pdiff < 0.01, n = 6), and cyclic AMP, 2.5 × 10-3 M (from 98.0 ± 32.6, P < 0.02, to 31.0 ± 13.9, NS; Pdiff < 0.05, n = 12), without altering the effect of nystatin, 450 U·mL-1, which increases Jw via a mechanism unrelated to apical aquaporin insertion (163.2 ± 16.3, P < 0.001, in controls vs. 150.3 ± 10.4, P < 0.001, in octanol-treated bladders; Pdiff: NS, n = 6). Another gap junction blocker, carbenoxolone, 2.0 × 10-4 M (CBX), exerted similar effects on the responses to oxytocin, 100 mIU·mL-1, reducing the response from 256.7 ± 33.6, P < 0.001, to 102.7 ± 10.4, P < 0.001; Pdiff < 0.01, n = 6) and nystatin, which was unaffected (95.0 ± 20.9, P < 0.01, vs. 132.0 ± 27.0, P < 0.01; Pdiff: NS, n = 6). Our results suggest that either gap junctions or, alternatively, unapposed gap junction hemichannels, may be important in the regulation of Jw in the isolated toad bladder, by modulating a step in the physiological process leading to increased apical membrane permeability. Le débit d’eau (Jw) osmotique à travers les membranes épithéliales du néphron distal augmente de lors l’exposition à la vasopressine : après la fixation de l’hormone à ses récepteurs, la concentration d’AMP cyclique intracellulaire augmente, favorisant l’insertion d’aquaporines dans la membrane apicale. Toutefois, le rôle de la communication intercellulaire dans le processus est encore mal connu. L’octanol, 1,2 × 10–3 M, un inhibiteur de jonctions lacunaires, a significativement réduit Jw (exprimé en mg·20 min–1) dans les vessies urinaires isolées de crapauds (un modèle de néphron distal) soumises à un gradient osmotique transépithélial et exposées à des agents reproduisant le mécanisme déclenché par la vasopressine : l’ocytocine, 50 mUI·mL–1 (de 185,3 ± 28,0, P < 0,001, à 69,0 ± 23,6, P < 0,05; Pdiff < 0,01, n = 6), et l’AMP cyclique, 2,5 × 10–3 M (de 98,0 ± 32,6, P < 0,02, à 31,0 ± 13,9, NS; Pdiff <0,05, n = 12) sans modifier l’effet de la nystatine, 450 U·mL–1, qui augmente Jw par un mécanisme indépendant de l’insertion apicale des aquaporines (163,2 ± 16,3, P < 0,001, dans les vessies témoins, vs 150,3 ± 10,4, P < 0,001, dans les vessies traitées à l’octanol; Pdiff : NS, n = 6). Une autre bloqueur de jonctions lacunaires, carbenoloxone, 2,0 × 10–4 M (CBX), a eu des effets similaires sur les réponses à l’ocytocine, 100 mUI·mL–1, réduisant la réponse de 256,7 ± 33,6, P < 0,001, à 102,7 ± 10,4, P < 0,001; Pdiff < 0,01, n = 6) et à la nystatine, qui n’a pas été affectée (95,0 ± 20,9, P < 0,01, vs 132,0 ± 27,0, P < 0,01; Pdiff: NS, n = 6). Nos résultats donnent à penser que les jonctions lacunaires, ou des demi-canaux non jonctionnels, pourraient jouer un rôle important dans la régulation du Jw dans la vessie isolée du crapaud, en modulant une étape dans le processus physiologique favorisant une augmentation de la perméabilité de la membrane apicale. Fil: Orce, Gabriel Guillermo F.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; Argentina Fil: Castillo, Graciela Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; Argentina Fil: Chanampa, Yolanda. Universidad Nacional de Tucumán. Facultad de Medicina; Argentina Fil: Bellomio, Augusto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; Argentina |
| description |
Osmotic water flow (Jw) across tight distal nephron epithelial membranes increases upon exposure to vasopressin: following binding of the hormone to its receptors, intracellular cyclic AMP concentration increases, leading to insertion of aquaporins in the apical membrane. The involvement of intercellular communication in the process, however, has not been adequately explored. Octanol, 1.2 × 10-3 M, a gap junction inhibitor, significantly reduced Jw (expressed as mg·20 min-1) in isolated toad urinary bladders (a model of the distal nephron) subjected to a transepithelial osmotic gradient and exposed to agents mimicking the vasopressin-triggered mechanism: oxytocin, 50 mIU·mL-1 (from 185.3 ± 28.0, P < 0.001, to 69.0 ± 23.6, P < 0.05; Pdiff < 0.01, n = 6), and cyclic AMP, 2.5 × 10-3 M (from 98.0 ± 32.6, P < 0.02, to 31.0 ± 13.9, NS; Pdiff < 0.05, n = 12), without altering the effect of nystatin, 450 U·mL-1, which increases Jw via a mechanism unrelated to apical aquaporin insertion (163.2 ± 16.3, P < 0.001, in controls vs. 150.3 ± 10.4, P < 0.001, in octanol-treated bladders; Pdiff: NS, n = 6). Another gap junction blocker, carbenoxolone, 2.0 × 10-4 M (CBX), exerted similar effects on the responses to oxytocin, 100 mIU·mL-1, reducing the response from 256.7 ± 33.6, P < 0.001, to 102.7 ± 10.4, P < 0.001; Pdiff < 0.01, n = 6) and nystatin, which was unaffected (95.0 ± 20.9, P < 0.01, vs. 132.0 ± 27.0, P < 0.01; Pdiff: NS, n = 6). Our results suggest that either gap junctions or, alternatively, unapposed gap junction hemichannels, may be important in the regulation of Jw in the isolated toad bladder, by modulating a step in the physiological process leading to increased apical membrane permeability. |
| publishDate |
2004 |
| dc.date.none.fl_str_mv |
2004-06 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
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publishedVersion |
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http://hdl.handle.net/11336/99472 Orce, Gabriel Guillermo F.; Castillo, Graciela Alicia; Chanampa, Yolanda; Bellomio, Augusto; Permeability to water in a tight epithelium: Possible modulating action of gap junctions; National Research Council Canada-NRC Research Press; Canadian Journal Of Physiology And Pharmacology; 82; 6; 6-2004; 417-421 0008-4212 1205-7541 CONICET Digital CONICET |
| url |
http://hdl.handle.net/11336/99472 |
| identifier_str_mv |
Orce, Gabriel Guillermo F.; Castillo, Graciela Alicia; Chanampa, Yolanda; Bellomio, Augusto; Permeability to water in a tight epithelium: Possible modulating action of gap junctions; National Research Council Canada-NRC Research Press; Canadian Journal Of Physiology And Pharmacology; 82; 6; 6-2004; 417-421 0008-4212 1205-7541 CONICET Digital CONICET |
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eng |
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eng |
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info:eu-repo/semantics/altIdentifier/doi/10.1139/y04-037 info:eu-repo/semantics/altIdentifier/url/https://www.nrcresearchpress.com/doi/10.1139/y04-037#.Xix2rE8zZdg |
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National Research Council Canada-NRC Research Press |
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National Research Council Canada-NRC Research Press |
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dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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