Peritubular fluid viscosity modulates H + flux in proximal tubules through NO release

Autores
Díaz Sylvester, Paula; Mac Laughlin, Myriam Alicia; Amorena, Carlos Ernesto
Año de publicación
2001
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We evaluated the effects of increasing the viscosity (eta) in peritubular capillary perfusates (PCP; 20 mM HNaPO4--Ringer, pH 7.4) on proximal convoluted tubule (PCT) acidification. Micropuncture experiments were performed with simultaneous luminal and peritubular perfusion. Changes in pH of a 20 mM HNaPO4--Ringer (pH 7.4 at t = 0) droplet placed in PCT lumen were measured with H+-sensitive microelectrodes. By adding neutral dextran (molecular wt 300,000-400,000) to the PCP, eta was increased. The effect of 10(-5) M ATP added to normal-eta PCP was evaluated. High eta increased H+ flux (85 and 97% when eta was increased 20 and 30%, respectively, above the control value). This increase was abolished by adding the nitric oxide antagonist N(omega)-nitro-L-arginine (L-NNA; 10(-4) M) or the purinoreceptor antagonists suramin (10(-4) M) and reactive blue 2 (3 x 10(-5) M). Addition of 5 x 10(-3) M L-arginine to the peritubular perfusate overcame the inhibitory effect of L-NNA on high-eta-induced increase in H+ flux. ATP increased H+ flux (80%), and this effect was blocked by L-NNA. These results suggest that changes in eta can modulate proximal H+ flux, at least in part, through ATP-dependent nitric oxide release from the endothelial cells of the peritubular capillaries.
Fil: Díaz Sylvester, Paula. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones Cardiológicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones Cardiológicas; Argentina
Fil: Mac Laughlin, Myriam Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones Cardiológicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones Cardiológicas; Argentina
Fil: Amorena, Carlos Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones Cardiológicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones Cardiológicas; Argentina. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; Argentina
Materia
Kidney
Proximal Tubule
Viscosity
Nitric Oxide
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:11336/71693
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/71693
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Peritubular fluid viscosity modulates H + flux in proximal tubules through NO releaseDíaz Sylvester, PaulaMac Laughlin, Myriam AliciaAmorena, Carlos ErnestoKidneyProximal TubuleViscosityNitric Oxidehttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1We evaluated the effects of increasing the viscosity (eta) in peritubular capillary perfusates (PCP; 20 mM HNaPO4--Ringer, pH 7.4) on proximal convoluted tubule (PCT) acidification. Micropuncture experiments were performed with simultaneous luminal and peritubular perfusion. Changes in pH of a 20 mM HNaPO4--Ringer (pH 7.4 at t = 0) droplet placed in PCT lumen were measured with H+-sensitive microelectrodes. By adding neutral dextran (molecular wt 300,000-400,000) to the PCP, eta was increased. The effect of 10(-5) M ATP added to normal-eta PCP was evaluated. High eta increased H+ flux (85 and 97% when eta was increased 20 and 30%, respectively, above the control value). This increase was abolished by adding the nitric oxide antagonist N(omega)-nitro-L-arginine (L-NNA; 10(-4) M) or the purinoreceptor antagonists suramin (10(-4) M) and reactive blue 2 (3 x 10(-5) M). Addition of 5 x 10(-3) M L-arginine to the peritubular perfusate overcame the inhibitory effect of L-NNA on high-eta-induced increase in H+ flux. ATP increased H+ flux (80%), and this effect was blocked by L-NNA. These results suggest that changes in eta can modulate proximal H+ flux, at least in part, through ATP-dependent nitric oxide release from the endothelial cells of the peritubular capillaries.Fil: Díaz Sylvester, Paula. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones Cardiológicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones Cardiológicas; ArgentinaFil: Mac Laughlin, Myriam Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones Cardiológicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones Cardiológicas; ArgentinaFil: Amorena, Carlos Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones Cardiológicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones Cardiológicas; Argentina. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; ArgentinaAmerican Physiological Society2001-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/71693Díaz Sylvester, Paula; Mac Laughlin, Myriam Alicia; Amorena, Carlos Ernesto; Peritubular fluid viscosity modulates H + flux in proximal tubules through NO release; American Physiological Society; American Journal Of Physiology-renal Physiology; 280; 2; 2-2001; F239-F2431931-857XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.physiology.org/doi/full/10.1152/ajprenal.2001.280.2.F239info:eu-repo/semantics/altIdentifier/doi/10.1152/ajprenal.2001.280.2.F239info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:03:51Zoai:ri.conicet.gov.ar:11336/71693instacron: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:34982025-09-03 10:03:51.452CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Peritubular fluid viscosity modulates H + flux in proximal tubules through NO release
title Peritubular fluid viscosity modulates H + flux in proximal tubules through NO release
spellingShingle Peritubular fluid viscosity modulates H + flux in proximal tubules through NO release
Díaz Sylvester, Paula
Kidney
Proximal Tubule
Viscosity
Nitric Oxide
title_short Peritubular fluid viscosity modulates H + flux in proximal tubules through NO release
title_full Peritubular fluid viscosity modulates H + flux in proximal tubules through NO release
title_fullStr Peritubular fluid viscosity modulates H + flux in proximal tubules through NO release
title_full_unstemmed Peritubular fluid viscosity modulates H + flux in proximal tubules through NO release
title_sort Peritubular fluid viscosity modulates H + flux in proximal tubules through NO release
dc.creator.none.fl_str_mv Díaz Sylvester, Paula
Mac Laughlin, Myriam Alicia
Amorena, Carlos Ernesto
author Díaz Sylvester, Paula
author_facet Díaz Sylvester, Paula
Mac Laughlin, Myriam Alicia
Amorena, Carlos Ernesto
author_role author
author2 Mac Laughlin, Myriam Alicia
Amorena, Carlos Ernesto
author2_role author
author
dc.subject.none.fl_str_mv Kidney
Proximal Tubule
Viscosity
Nitric Oxide
topic Kidney
Proximal Tubule
Viscosity
Nitric Oxide
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We evaluated the effects of increasing the viscosity (eta) in peritubular capillary perfusates (PCP; 20 mM HNaPO4--Ringer, pH 7.4) on proximal convoluted tubule (PCT) acidification. Micropuncture experiments were performed with simultaneous luminal and peritubular perfusion. Changes in pH of a 20 mM HNaPO4--Ringer (pH 7.4 at t = 0) droplet placed in PCT lumen were measured with H+-sensitive microelectrodes. By adding neutral dextran (molecular wt 300,000-400,000) to the PCP, eta was increased. The effect of 10(-5) M ATP added to normal-eta PCP was evaluated. High eta increased H+ flux (85 and 97% when eta was increased 20 and 30%, respectively, above the control value). This increase was abolished by adding the nitric oxide antagonist N(omega)-nitro-L-arginine (L-NNA; 10(-4) M) or the purinoreceptor antagonists suramin (10(-4) M) and reactive blue 2 (3 x 10(-5) M). Addition of 5 x 10(-3) M L-arginine to the peritubular perfusate overcame the inhibitory effect of L-NNA on high-eta-induced increase in H+ flux. ATP increased H+ flux (80%), and this effect was blocked by L-NNA. These results suggest that changes in eta can modulate proximal H+ flux, at least in part, through ATP-dependent nitric oxide release from the endothelial cells of the peritubular capillaries.
Fil: Díaz Sylvester, Paula. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones Cardiológicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones Cardiológicas; Argentina
Fil: Mac Laughlin, Myriam Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones Cardiológicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones Cardiológicas; Argentina
Fil: Amorena, Carlos Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones Cardiológicas. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones Cardiológicas; Argentina. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; Argentina
description We evaluated the effects of increasing the viscosity (eta) in peritubular capillary perfusates (PCP; 20 mM HNaPO4--Ringer, pH 7.4) on proximal convoluted tubule (PCT) acidification. Micropuncture experiments were performed with simultaneous luminal and peritubular perfusion. Changes in pH of a 20 mM HNaPO4--Ringer (pH 7.4 at t = 0) droplet placed in PCT lumen were measured with H+-sensitive microelectrodes. By adding neutral dextran (molecular wt 300,000-400,000) to the PCP, eta was increased. The effect of 10(-5) M ATP added to normal-eta PCP was evaluated. High eta increased H+ flux (85 and 97% when eta was increased 20 and 30%, respectively, above the control value). This increase was abolished by adding the nitric oxide antagonist N(omega)-nitro-L-arginine (L-NNA; 10(-4) M) or the purinoreceptor antagonists suramin (10(-4) M) and reactive blue 2 (3 x 10(-5) M). Addition of 5 x 10(-3) M L-arginine to the peritubular perfusate overcame the inhibitory effect of L-NNA on high-eta-induced increase in H+ flux. ATP increased H+ flux (80%), and this effect was blocked by L-NNA. These results suggest that changes in eta can modulate proximal H+ flux, at least in part, through ATP-dependent nitric oxide release from the endothelial cells of the peritubular capillaries.
publishDate 2001
dc.date.none.fl_str_mv 2001-02
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/11336/71693
Díaz Sylvester, Paula; Mac Laughlin, Myriam Alicia; Amorena, Carlos Ernesto; Peritubular fluid viscosity modulates H + flux in proximal tubules through NO release; American Physiological Society; American Journal Of Physiology-renal Physiology; 280; 2; 2-2001; F239-F243
1931-857X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/71693
identifier_str_mv Díaz Sylvester, Paula; Mac Laughlin, Myriam Alicia; Amorena, Carlos Ernesto; Peritubular fluid viscosity modulates H + flux in proximal tubules through NO release; American Physiological Society; American Journal Of Physiology-renal Physiology; 280; 2; 2-2001; F239-F243
1931-857X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.physiology.org/doi/full/10.1152/ajprenal.2001.280.2.F239
info:eu-repo/semantics/altIdentifier/doi/10.1152/ajprenal.2001.280.2.F239
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
dc.publisher.none.fl_str_mv American Physiological Society
publisher.none.fl_str_mv American Physiological Society
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
_version_ 1842269824320798720
score 13.13397

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