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dc.date.accessioned | 2019-10-30T18:59:17Z | |
dc.date.available | 2019-10-30T18:59:17Z | |
dc.date.issued | 2003 | |
dc.identifier.uri | http://sedici.unlp.edu.ar/handle/10915/84453 | |
dc.description.abstract | Objective: This work was aimed to prove that release/formation of endogenous endothelin acting in an autocrine/paracrine fashion contributes to the increase in contractility promoted by a low dose of angiotensin II. Methods: Isolated cat papillary muscles were used for force, pHi, [Na+]i and [Ca2+]i measurements and isolated cat myocytes for patch-clamp experiments. Results: In papillary muscles, 1.0 nmol/l angiotensin II increased force by 23±2% (n=4, P<0.05), [Na+]i by 2.2±0.2 mmol/l (n=4, P<0.05), and peak (but not diastolic) Ca2+ from 0.674±0.11 to 0.768±0.13 μmol/l (n=4, P<0.05), without affecting pH i. Force and [Na+]i increase were abolished by inhibition of the Na+/H+ exchanger (NHE) with the inhibitor HOE642, blockade of endothelin receptors with the nonselective antagonist TAK044 and by inhibition of the endothelin-converting enzyme with phosphoramidon. Force but not [Na+]i increase was abolished by inhibition of reverse Na+/Ca2+ exchange (NCX) with the inhibitor KB-R7943. Similar increase in force (21±2%, n=4, P<0.05) and in [Na+]i (2.4±0.4 mmol/l, n=4, P<0.05) that were also suppressed by TAK044 and HOE642 were induced by exogenous 5.0 nmol/l endothelin-1. KB-R7943 reverted the endothelin-1 effect on force but not on [Na+]i. In isolated myocytes, exogenous endothelin-1 dose-dependently increased the NCX current and shifted the NCX reversal potential (ENCX) to a more negative value (ΔENCX: -10±3 and -17±5 mV, with 1 and 10 nmol/l endothelin-1, respectively, n=12). The latter effect was prevented by HOE642. Conclusion: Taken together, the results indicate that a low dose of angiotensin II induces release of endothelin, which, in autocrine/paracrine fashion activates the Na+/H+ exchanger, increases [Na+]i and changes ENCX, promoting the influx of Ca2+ that leads to a positive inotropic effect (PIE). | en |
dc.format.extent | 589-597 | es |
dc.language | en | es |
dc.subject | Angiotensin | es |
dc.subject | Cat papillary muscles | es |
dc.subject | E-C coupling | es |
dc.subject | Endothelins | es |
dc.subject | Ion transport | es |
dc.subject | Isolated cat myocytes | es |
dc.subject | Na/Ca-exchanger | es |
dc.subject | Na/H-exchanger | es |
dc.title | A low dose of angiotensin II increases inotropism through activation of reverse Na+/Ca2+ exchange by endothelin release | en |
dc.type | Articulo | es |
sedici.identifier.other | doi:10.1016/j.cardiores.2003.09.004 | es |
sedici.identifier.other | eid:2-s2.0-0344196795 | es |
sedici.identifier.issn | 0008-6363 | es |
sedici.creator.person | Pérez, Néstor Gustavo | es |
sedici.creator.person | Villa Abrille, María Celeste | es |
sedici.creator.person | Aiello, Ernesto Alejandro | es |
sedici.creator.person | Dulce, Raúl Ariel | es |
sedici.creator.person | Cingolani, Horacio Eugenio | es |
sedici.creator.person | Camilión de Hurtado, María Cristina | es |
sedici.subject.materias | Ciencias Médicas | es |
sedici.description.fulltext | true | es |
mods.originInfo.place | Facultad de Ciencias Médicas | es |
mods.originInfo.place | Centro de Investigaciones Cardiovasculares | es |
sedici.subtype | Articulo | es |
sedici.rights.license | Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) | |
sedici.rights.uri | http://creativecommons.org/licenses/by-nc-sa/4.0/ | |
sedici.description.peerReview | peer-review | es |
sedici.relation.journalTitle | Cardiovascular Research | es |
sedici.relation.journalVolumeAndIssue | vol. 60, no. 3 | es |
sedici.rights.sherpa | * RoMEO: verde* Pre-print del autor: can* Post-print del autor: can* Versión de editor/PDF:cannot* Condiciones:>>El pre-print sólo puede depositarse antes de la aceptación>>El pre-print debe acompañarse de una declaración establecida (ver enlace)>>El pre-print no debe reemplazarse por el post-print, sino que se enlazará a la versión publicada con una declaración establecida corregida>>Pre-print on author's personal website, employer website, free public server or pre-prints in subject area>>Post-print en el sitio web personal del autor de manera inmediata>>Post-print in Institutional repositories or Central repositories after 12 months embargo>>La versión de editor/PDF no puede utilizarse>>La fuente editorial debe reconocerse>>Debe ir enlazado a la versión de editor>>La copia archivada debe acompañarse de la frase establecida (ver Política)>>El editor depositará copia en PubMed Central en nombre de los autores financiados por el NIH>>Publisher last contacted on 19/02/2015* Link a Sherpa: http://sherpa.ac.uk/romeo/issn/0008-6363/es/ |