Postnatal nitric oxide inhibition modifies neurotensin effect on ATPase activity
We have previously showed that peptide neurotensin inhibits neuronal Na+, K+-ATPase activity, an effect which involves high affinity neurotensin receptor. Nitric oxide (NO) acts as a neurotransmitter or as a neuromodulator when it is synthesized by neuronal nitric oxide synthase. Neurotensin effect...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2011 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/67455 |
| Acceso en línea: | http://hdl.handle.net/11336/67455 |
| Access Level: | acceso abierto |
| Palabra clave: | [3h]-Ouabain Binding Na+, K+-Atpase Activity Neurotensin Nitric Oxide Nitric Oxide Synthase https://purl.org/becyt/ford/3.3 https://purl.org/becyt/ford/3 |
| Sumario: | We have previously showed that peptide neurotensin inhibits neuronal Na+, K+-ATPase activity, an effect which involves high affinity neurotensin receptor. Nitric oxide (NO) acts as a neurotransmitter or as a neuromodulator when it is synthesized by neuronal nitric oxide synthase. Neurotensin effect on Na+, K+-ATPase activity was evaluated in cortical synaptosomal membranes isolated from rats injected at 3, 4 and 5 postnatal days with saline (control) or N (ω)-nitro-l-arginine methyl esther (L-NAME), a nitric oxide synthase inhibitor. Assays were carried out at two stages: juvenile (35 days) and adult (56 days) ages. In an open field task, results recorded in juvenile rats markedly differed from those obtained in adult rats. The presence of neurotensin at 3.5 × 10-8-3.5 × 10-6M concentration decreased 16-34% Na+, K +-ATPase activity in membranes purified from control animals. At variance, the peptide failed to alter this enzyme activity in membranes obtained after L-NAME treatment. After administration of L-NAME, [3H]-ouabain binding to membranes isolated from adult male rats decreased 64% in the presence of 1.0 × 10-6M neurotensin, a peptide concentration which only slightly decreased binding to membranes isolated from juvenile rats. It is postulated that early postnatal NO dysfunction may exert a permanent change in neurotensin system that influence later Na+, K +-ATPase response to neurotensin. |
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