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Liberación espontánea de un transmisor de los conos de crecimiento de las neuronas embrionarias
Nature
|October 13, 1983
Resumen
Los conos de crecimiento nervioso liberan espontáneamente acetilcolina (ACh), un neurotransmisor, incluso antes de la formación de sinapsis. Este descubrimiento sugiere que la liberación de ACh es parte integral de la extensión de la neurita y la interacción del cono de crecimiento con su entorno.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Biología del desarrollo Biología del desarrollo.
- Biología celular Biología celular.
Sus antecedentes:
- Los conos de crecimiento nervioso extienden los procesos para encontrar objetivos, formando sinapsis rápidamente.
- La rápida formación de sinapsis implica una maquinaria de neurotransmisores preexistente en los conos de crecimiento.
Objetivo del estudio:
- Para investigar la liberación espontánea de neurotransmisores de los conos de crecimiento.
- Para determinar si los conos de crecimiento liberan acetilcolina (ACh) antes del contacto sináptico.
Principales métodos:
- Se utilizan neuronas embrionarias de Xenopus laevis y células musculares en cultivo.
- Empleó un parche exterior de la membrana muscular como una sonda extracelular.
- Monitoreo de la actividad de un solo canal indicativo de la activación del receptor de acetilcolina.
Principales resultados:
- Se observó actividad de un solo canal que se asemeja a los canales del receptor de acetilcolina muscular.
- Esta actividad se produjo cuando la sonda estaba cerca de los conos de crecimiento del 50% de las neuronas probadas.
- Sugiere la liberación espontánea de acetilcolina (ACh) de los conos de crecimiento embrionario de Xenopus.
Conclusiones:
- Los conos de crecimiento pueden liberar espontáneamente acetilcolina (ACh).
- Esta liberación puede estar relacionada con la incorporación de la membrana durante la extensión de la neurita.
- La liberación de ACh podría desempeñar un papel en las interacciones del cono de crecimiento con las células diana.
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