Angiotensin II inhibits ADH-stimulated cAMP: role on O2- and transport-related oxygen consumption in the loop of Henle

Autores
Silva, Guillermo Benjamin; Juncos, Luis Isaias; Baigorria, S. T.; Garcia, Nestor Horacio
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Dehydration and acute reductions of blood pressure increases ADH and Ang II levels. These hormones increase transport along the distal nephron. In the thick ascending limb (TAL) ADH increases transport via cAMP, while Ang II acts via superoxide (O2-). However, the mechanism of interaction of these hormones in this segment remains unclear. The aim of this study was to explore ADH/Ang II interactions on TAL transport. For this, we measured the effects of ADH/Ang II, added sequentially to TAL suspensions from Wistar rats, on oxygen consumption (QO2) -as a transport index-, cAMP and O2-. Basal QO2 was 112+-5 nmol O2/min/mg protein. Addition of ADH (1nM) increased QO2 by 227 percent. In the presence of ADH, Ang II (1nM) elicited a QO2 transient response. During an initial 3.1+-0.7 minutes after adding Ang II, QO2 decreased 58 percent (p less than 0.03 initial vs. ADH) and then rose by 188 percent (p less than 0.03 late vs initial Ang II). We found that Losartan blocked the initial effects of Ang II and the latter blocked ADH and forskolin-stimulated cAMP. The NOS inhibitor L-NAME or the AT2 receptor antagonist PD123319 showed no effect on transported related oxygen consumption. Then, we assessed the late period after adding Ang II. The O2- scavenger tempol blocked the late Ang II effects on QO2, while Ang II increased O2- production during this period. We conclude that 1) Ang II has a transient effect on ADH-stimulated transport; 2) this effect is mediated by AT1 receptors; 3) the initial period is mediated by decreased cAMP and 4) the late period is mediated by O2-.
Fil: Silva, Guillermo Benjamin. Universidad Catolica de Córdoba. Facultad de Ciencias Químicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Juncos, Luis Isaias. Fundacion J. Robert Cade; Argentina
Fil: Baigorria, S. T.. Fundacion J. Robert Cade; Argentina
Fil: Garcia, Nestor Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Ciencias de la Salud. Universidad Nacional de Córdoba. Instituto de Investigaciones en Ciencias de la Salud; Argentina
Materia
Camp
Superoxide
Ang Ii
Tubular Transport
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/23700
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/23700
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Angiotensin II inhibits ADH-stimulated cAMP: role on O2- and transport-related oxygen consumption in the loop of HenleSilva, Guillermo BenjaminJuncos, Luis IsaiasBaigorria, S. T.Garcia, Nestor HoracioCampSuperoxideAng IiTubular Transporthttps://purl.org/becyt/ford/3.1https://purl.org/becyt/ford/3Dehydration and acute reductions of blood pressure increases ADH and Ang II levels. These hormones increase transport along the distal nephron. In the thick ascending limb (TAL) ADH increases transport via cAMP, while Ang II acts via superoxide (O2-). However, the mechanism of interaction of these hormones in this segment remains unclear. The aim of this study was to explore ADH/Ang II interactions on TAL transport. For this, we measured the effects of ADH/Ang II, added sequentially to TAL suspensions from Wistar rats, on oxygen consumption (QO2) -as a transport index-, cAMP and O2-. Basal QO2 was 112+-5 nmol O2/min/mg protein. Addition of ADH (1nM) increased QO2 by 227 percent. In the presence of ADH, Ang II (1nM) elicited a QO2 transient response. During an initial 3.1+-0.7 minutes after adding Ang II, QO2 decreased 58 percent (p less than 0.03 initial vs. ADH) and then rose by 188 percent (p less than 0.03 late vs initial Ang II). We found that Losartan blocked the initial effects of Ang II and the latter blocked ADH and forskolin-stimulated cAMP. The NOS inhibitor L-NAME or the AT2 receptor antagonist PD123319 showed no effect on transported related oxygen consumption. Then, we assessed the late period after adding Ang II. The O2- scavenger tempol blocked the late Ang II effects on QO2, while Ang II increased O2- production during this period. We conclude that 1) Ang II has a transient effect on ADH-stimulated transport; 2) this effect is mediated by AT1 receptors; 3) the initial period is mediated by decreased cAMP and 4) the late period is mediated by O2-.Fil: Silva, Guillermo Benjamin. Universidad Catolica de Córdoba. Facultad de Ciencias Químicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Juncos, Luis Isaias. Fundacion J. Robert Cade; ArgentinaFil: Baigorria, S. T.. Fundacion J. Robert Cade; ArgentinaFil: Garcia, Nestor Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Ciencias de la Salud. Universidad Nacional de Córdoba. Instituto de Investigaciones en Ciencias de la Salud; ArgentinaBiolife Sas2013-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/23700Silva, Guillermo Benjamin; Juncos, Luis Isaias; Baigorria, S. T.; Garcia, Nestor Horacio; Angiotensin II inhibits ADH-stimulated cAMP: role on O2- and transport-related oxygen consumption in the loop of Henle; Biolife Sas; Journal Of Biological Regulators And Homeostatic Agents; 27; 2; 7-2013; 569-5780393-974XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.biolifesas.org/contentsJBRHA.htminfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:45:00Zoai:ri.conicet.gov.ar:11336/23700instacron: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:34982025-10-15 14:45:00.83CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Angiotensin II inhibits ADH-stimulated cAMP: role on O2- and transport-related oxygen consumption in the loop of Henle
title Angiotensin II inhibits ADH-stimulated cAMP: role on O2- and transport-related oxygen consumption in the loop of Henle
spellingShingle Angiotensin II inhibits ADH-stimulated cAMP: role on O2- and transport-related oxygen consumption in the loop of Henle
Silva, Guillermo Benjamin
Camp
Superoxide
Ang Ii
Tubular Transport
title_short Angiotensin II inhibits ADH-stimulated cAMP: role on O2- and transport-related oxygen consumption in the loop of Henle
title_full Angiotensin II inhibits ADH-stimulated cAMP: role on O2- and transport-related oxygen consumption in the loop of Henle
title_fullStr Angiotensin II inhibits ADH-stimulated cAMP: role on O2- and transport-related oxygen consumption in the loop of Henle
title_full_unstemmed Angiotensin II inhibits ADH-stimulated cAMP: role on O2- and transport-related oxygen consumption in the loop of Henle
title_sort Angiotensin II inhibits ADH-stimulated cAMP: role on O2- and transport-related oxygen consumption in the loop of Henle
dc.creator.none.fl_str_mv Silva, Guillermo Benjamin
Juncos, Luis Isaias
Baigorria, S. T.
Garcia, Nestor Horacio
author Silva, Guillermo Benjamin
author_facet Silva, Guillermo Benjamin
Juncos, Luis Isaias
Baigorria, S. T.
Garcia, Nestor Horacio
author_role author
author2 Juncos, Luis Isaias
Baigorria, S. T.
Garcia, Nestor Horacio
author2_role author
author
author
dc.subject.none.fl_str_mv Camp
Superoxide
Ang Ii
Tubular Transport
topic Camp
Superoxide
Ang Ii
Tubular Transport
purl_subject.fl_str_mv https://purl.org/becyt/ford/3.1
https://purl.org/becyt/ford/3
dc.description.none.fl_txt_mv Dehydration and acute reductions of blood pressure increases ADH and Ang II levels. These hormones increase transport along the distal nephron. In the thick ascending limb (TAL) ADH increases transport via cAMP, while Ang II acts via superoxide (O2-). However, the mechanism of interaction of these hormones in this segment remains unclear. The aim of this study was to explore ADH/Ang II interactions on TAL transport. For this, we measured the effects of ADH/Ang II, added sequentially to TAL suspensions from Wistar rats, on oxygen consumption (QO2) -as a transport index-, cAMP and O2-. Basal QO2 was 112+-5 nmol O2/min/mg protein. Addition of ADH (1nM) increased QO2 by 227 percent. In the presence of ADH, Ang II (1nM) elicited a QO2 transient response. During an initial 3.1+-0.7 minutes after adding Ang II, QO2 decreased 58 percent (p less than 0.03 initial vs. ADH) and then rose by 188 percent (p less than 0.03 late vs initial Ang II). We found that Losartan blocked the initial effects of Ang II and the latter blocked ADH and forskolin-stimulated cAMP. The NOS inhibitor L-NAME or the AT2 receptor antagonist PD123319 showed no effect on transported related oxygen consumption. Then, we assessed the late period after adding Ang II. The O2- scavenger tempol blocked the late Ang II effects on QO2, while Ang II increased O2- production during this period. We conclude that 1) Ang II has a transient effect on ADH-stimulated transport; 2) this effect is mediated by AT1 receptors; 3) the initial period is mediated by decreased cAMP and 4) the late period is mediated by O2-.
Fil: Silva, Guillermo Benjamin. Universidad Catolica de Córdoba. Facultad de Ciencias Químicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Juncos, Luis Isaias. Fundacion J. Robert Cade; Argentina
Fil: Baigorria, S. T.. Fundacion J. Robert Cade; Argentina
Fil: Garcia, Nestor Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Ciencias de la Salud. Universidad Nacional de Córdoba. Instituto de Investigaciones en Ciencias de la Salud; Argentina
description Dehydration and acute reductions of blood pressure increases ADH and Ang II levels. These hormones increase transport along the distal nephron. In the thick ascending limb (TAL) ADH increases transport via cAMP, while Ang II acts via superoxide (O2-). However, the mechanism of interaction of these hormones in this segment remains unclear. The aim of this study was to explore ADH/Ang II interactions on TAL transport. For this, we measured the effects of ADH/Ang II, added sequentially to TAL suspensions from Wistar rats, on oxygen consumption (QO2) -as a transport index-, cAMP and O2-. Basal QO2 was 112+-5 nmol O2/min/mg protein. Addition of ADH (1nM) increased QO2 by 227 percent. In the presence of ADH, Ang II (1nM) elicited a QO2 transient response. During an initial 3.1+-0.7 minutes after adding Ang II, QO2 decreased 58 percent (p less than 0.03 initial vs. ADH) and then rose by 188 percent (p less than 0.03 late vs initial Ang II). We found that Losartan blocked the initial effects of Ang II and the latter blocked ADH and forskolin-stimulated cAMP. The NOS inhibitor L-NAME or the AT2 receptor antagonist PD123319 showed no effect on transported related oxygen consumption. Then, we assessed the late period after adding Ang II. The O2- scavenger tempol blocked the late Ang II effects on QO2, while Ang II increased O2- production during this period. We conclude that 1) Ang II has a transient effect on ADH-stimulated transport; 2) this effect is mediated by AT1 receptors; 3) the initial period is mediated by decreased cAMP and 4) the late period is mediated by O2-.
publishDate 2013
dc.date.none.fl_str_mv 2013-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/23700
Silva, Guillermo Benjamin; Juncos, Luis Isaias; Baigorria, S. T.; Garcia, Nestor Horacio; Angiotensin II inhibits ADH-stimulated cAMP: role on O2- and transport-related oxygen consumption in the loop of Henle; Biolife Sas; Journal Of Biological Regulators And Homeostatic Agents; 27; 2; 7-2013; 569-578
0393-974X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/23700
identifier_str_mv Silva, Guillermo Benjamin; Juncos, Luis Isaias; Baigorria, S. T.; Garcia, Nestor Horacio; Angiotensin II inhibits ADH-stimulated cAMP: role on O2- and transport-related oxygen consumption in the loop of Henle; Biolife Sas; Journal Of Biological Regulators And Homeostatic Agents; 27; 2; 7-2013; 569-578
0393-974X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.biolifesas.org/contentsJBRHA.htm
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Biolife Sas
publisher.none.fl_str_mv Biolife Sas
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.22299

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