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Las vías moleculares comunes median la potenciación a largo plazo de la excitación sináptica y la lenta inhibición
Cindy Shen Huang1, Song-Hai Shi, Jernej Ule
1Howard Hughes Medical Institute and Departments of Physiology and Biochemistry, University of California, San Francisco, CA 94143, USA.
Cell
|October 11, 2005
Resumen
Este estudio revela que la misma vía mejora tanto la plasticidad sináptica excitatoria como la inhibidora. Sin embargo, la proteína Nova-2 es crucial para la plasticidad inhibidora, impactando el aprendizaje y la memoria.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
Sus antecedentes:
- La plasticidad sináptica en las espinas dendríticas subyace al aprendizaje y la memoria.
- La potenciación a largo plazo (LTP) de las corrientes postsinápticas excitatorias (EPSC) está bien estudiada.
- Los actores clave en la LTP excitatoria incluyen los receptores NMDA y CaMKII.
Objetivo del estudio:
- Para investigar la plasticidad de las corrientes postsinápticas inhibidoras (IPSC).
- Para explorar el papel del receptor de N-metil-D-asparato (NMDA-R) y la vía de la proteína quinasa II (CaMKII) dependiente de la calmodulina en la plasticidad inhibidora.
- Para determinar la participación de la proteína Nova-2 en la plasticidad sináptica.
Principales métodos:
- Registros electrofisiológicos en las neuronas piramidal CA1.
- Investigando la LTP de las corrientes postsinápticas inhibidoras lentas (sIPSC).
- Utilizando ratones nocaut que carecen de la proteína Nova-2.
Principales resultados:
- La vía NMDA-R/CaMKII induce la LTP de las sIPSC mediadas por los receptores GABA (B) y los canales GIRK.
- La LTP de sIPSCs, pero no de EPSCs, fue abolida en ratones que carecían de Nova-2.
- Nova-2 es esencial para la plasticidad sináptica inhibidora.
Conclusiones:
- La misma vía de señalización regula tanto la plasticidad sináptica excitatoria como la inhibidora.
- Nova-2 juega un papel crítico en la plasticidad inhibidora, distinta de su papel en la plasticidad excitatoria.
- La desregulación de Nova-2 puede contribuir a trastornos neurológicos asociados con una plasticidad sináptica deteriorada.
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