Dopamine induces ERK activation in renal epithelial cells through H2O2 produced by monoamine oxidase

Dopamine induces ERK activation in renal epithelial cells through H2O2 produced by monoamine oxidase. The rat renal proximal tubule cells contain a large amount of monoamine oxidase, which catalyzes the oxidative deamination of catecholamines such as dopamine (DA). The aim of this study is to invest...

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Veröffentlicht in:Kidney international 2001-01, Vol.59 (1), p.76-86
Hauptverfasser: Vindis, Cécile, Séguélas, Marie-Hélène, Lanier, Stephen, Parini, Angelo, Cambon, Claudie
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Séguélas, Marie-Hélène
Lanier, Stephen
Parini, Angelo
Cambon, Claudie
description Dopamine induces ERK activation in renal epithelial cells through H2O2 produced by monoamine oxidase. The rat renal proximal tubule cells contain a large amount of monoamine oxidase, which catalyzes the oxidative deamination of catecholamines such as dopamine (DA). The aim of this study is to investigate the potential role of hydrogen peroxide (H2O2) produced by monoamine oxidase (MAO) isoform on regulation of cell signaling and function. Primary rat proximal tubular cells, which contain almost exclusively MAO-A, and human embryonic kidney 293 (HEK 293) cells stably transfected with human MAO-B cDNA were treated with DA or tyramine in the presence or the absence of some inhibitors. Then, Shc protein tyrosine phosphorylation and extracellular-regulated kinase (ERK) activation were evaluated by immunoprecipitation/immunoblot analysis and cell proliferation by [3H]thymidine incorporation or cell counting. In rat proximal tubule cells, DA induced tyrosine phosphorylation of Shc, ERK activation, and a significant increase in DNA synthesis. The involvement of MAO-dependent H2O2 generation induced by DA (5 μmol/L) was supported by the demonstration that the DA effects were (1) fully prevented by cell pretreatment with the MAO inhibitor pargyline, the antioxydant N-acetylcysteine (NAC), and the DA uptake inhibitor GBR 12909; (2) not abrogated by the D1 and D2 receptor antagonists; (3) observed in HEK 293 MAO-B cells but not in HEK 293 wild-type cells, which do not express MAO; and (4) similar to those induced by another MAO substrate, tyramine. Taken together, these results show that in addition to the effects related to receptor stimulation, DA, and probably the other catecholamines, may induce some of its effects through the MAO-dependent H2O2 production.
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The rat renal proximal tubule cells contain a large amount of monoamine oxidase, which catalyzes the oxidative deamination of catecholamines such as dopamine (DA). The aim of this study is to investigate the potential role of hydrogen peroxide (H2O2) produced by monoamine oxidase (MAO) isoform on regulation of cell signaling and function. Primary rat proximal tubular cells, which contain almost exclusively MAO-A, and human embryonic kidney 293 (HEK 293) cells stably transfected with human MAO-B cDNA were treated with DA or tyramine in the presence or the absence of some inhibitors. Then, Shc protein tyrosine phosphorylation and extracellular-regulated kinase (ERK) activation were evaluated by immunoprecipitation/immunoblot analysis and cell proliferation by [3H]thymidine incorporation or cell counting. In rat proximal tubule cells, DA induced tyrosine phosphorylation of Shc, ERK activation, and a significant increase in DNA synthesis. The involvement of MAO-dependent H2O2 generation induced by DA (5 μmol/L) was supported by the demonstration that the DA effects were (1) fully prevented by cell pretreatment with the MAO inhibitor pargyline, the antioxydant N-acetylcysteine (NAC), and the DA uptake inhibitor GBR 12909; (2) not abrogated by the D1 and D2 receptor antagonists; (3) observed in HEK 293 MAO-B cells but not in HEK 293 wild-type cells, which do not express MAO; and (4) similar to those induced by another MAO substrate, tyramine. 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The rat renal proximal tubule cells contain a large amount of monoamine oxidase, which catalyzes the oxidative deamination of catecholamines such as dopamine (DA). The aim of this study is to investigate the potential role of hydrogen peroxide (H2O2) produced by monoamine oxidase (MAO) isoform on regulation of cell signaling and function. Primary rat proximal tubular cells, which contain almost exclusively MAO-A, and human embryonic kidney 293 (HEK 293) cells stably transfected with human MAO-B cDNA were treated with DA or tyramine in the presence or the absence of some inhibitors. Then, Shc protein tyrosine phosphorylation and extracellular-regulated kinase (ERK) activation were evaluated by immunoprecipitation/immunoblot analysis and cell proliferation by [3H]thymidine incorporation or cell counting. In rat proximal tubule cells, DA induced tyrosine phosphorylation of Shc, ERK activation, and a significant increase in DNA synthesis. 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subjects Adaptor Proteins, Signal Transducing
Adaptor Proteins, Vesicular Transport
amine oxidases
Animals
Biological and medical sciences
catecholamines
Cell Division - physiology
Cells, Cultured
Dopamine - pharmacology
Enzyme Activation
Fundamental and applied biological sciences. Psychology
hydrogen peroxide
Hydrogen Peroxide - metabolism
Kidney Tubules, Proximal - cytology
Kidney Tubules, Proximal - drug effects
Kidney Tubules, Proximal - enzymology
Kidney Tubules, Proximal - metabolism
mitogen-activated protein kinases
Mitogen-Activated Protein Kinases - metabolism
Monoamine Oxidase - metabolism
Phosphorylation
Proteins - metabolism
Rats
Rats, Sprague-Dawley
reactive oxygen species
Shc Signaling Adaptor Proteins
Src Homology 2 Domain-Containing, Transforming Protein 1
Substrate Specificity
Thymidine - metabolism
Tyramine - pharmacology
Tyrosine - metabolism
Vertebrates: urinary system
title Dopamine induces ERK activation in renal epithelial cells through H2O2 produced by monoamine oxidase
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