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Facilitación de las corrientes espinales de los receptores NMDA por derrame de glicina liberada sinápticamente
Seifollah Ahmadi1, Uta Muth-Selbach, Andreas Lauterbach
1Institut für Experimentelle und Klinische Pharmakologie und Toxikologie, Universität Erlangen-Nürnberg, Fahrstrasse 17, D-91054 Erlangen, Germany.
Science (New York, N.Y.)
|June 28, 2003
Resumen
La glicina liberada sinápticamente mejora la actividad del receptor de N-metil-D-aspartato (NMDA) en el cuerno dorsal superficial. Este mecanismo de derrame de glicina puede contribuir a la hipersensibilidad al dolor inflamatorio.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Investigaciones sobre el dolor.
- La plasticidad sináptica.
Sus antecedentes:
- Los receptores de N-metil-D-aspartato (NMDA) son cruciales para la transmisión sináptica y la plasticidad en el sistema nervioso central (SNC) de los mamíferos.
- La glicina es un co-agonista requerido para la activación del receptor NMDA.
- El papel de la glicina extracelular en la modulación de las respuestas sinápticas de los receptores NMDA in vivo sigue siendo en gran medida desconocido.
Objetivo del estudio:
- Para investigar si la glicina liberada sinápticamente influye en las corrientes de los receptores NMDA en el cuerno dorsal superficial.
- Explorar el mecanismo de derrame de glicina y su contribución al procesamiento del dolor.
Principales métodos:
- Registros electrofisiológicos en el cuerno dorsal superficial.
- Investigación de las corrientes de los receptores NMDA.
- Análisis de la liberación y derrame de glicina sináptica durante la alta actividad presináptica.
Principales resultados:
- Se descubrió que la glicina liberada sinápticamente facilita las corrientes de los receptores NMDA en el cuerno dorsal superficial.
- La glicina liberada de las interneuronas inhibidoras puede escapar de la hendidura sináptica y llegar a los receptores NMDA cercanos a través del derrame.
- Este mecanismo de derrame se observa durante una alta actividad presináptica.
Conclusiones:
- La glicina extracelular, liberada a través del derrame de las interneuronas inhibidoras, modula activamente la función del receptor NMDA sináptico.
- Este mecanismo puede desempeñar un papel importante en el desarrollo de la hiperalgesia inflamatoria y la transmisión del dolor.
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