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La inhibición de la liberación de acetilcolina de los nervios preganglionares de la rana por el ATP pero no por la
Nature
|September 22, 1983
Resumen
El trifosfato de adenosina (ATP) y la adenosina inhiben la secreción de acetilcolina en el sistema nervioso. Este estudio encontró que el ATP es un inhibidor más potente que la adenosina en los ganglios simpáticos.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Neurofarmacología y Neurofarmacología.
Sus antecedentes:
- El trifosfato de adenosina (ATP) se libera junto con la acetilcolina en las sinapsis periféricas de los vertebrados.
- Se sabe que el ATP y sus derivados modulan la secreción de neurotransmisores, lo que sugiere un papel en la transmisión sináptica.
- Investigaciones anteriores indicaron que los receptores de adenosina median los efectos inhibidores de los derivados de la adenosina en la liberación del transmisor, lo que requiere la hidrólisis de ATP a la adenosina.
Objetivo del estudio:
- Para investigar el papel inhibidor directo del ATP en la secreción de acetilcolina.
- Para comparar la potencia del ATP y la adenosina como inhibidores de la liberación de acetilcolina en los ganglios simpáticos.
- Para probar la hipótesis de que el propio ATP, en lugar de su metabolito adenosina, es el inhibidor primario.
Principales métodos:
- Se realizaron experimentos en los ganglios simpáticos.
- Se midieron los efectos del ATP y la adenosina aplicados exógenamente en la secreción de acetilcolina.
- Se comparó la potencia del ATP y la adenosina como inhibidores de la liberación de acetilcolina.
Principales resultados:
- Se encontró que el trifosfato de adenosina (ATP) es significativamente más potente que la adenosina en la inhibición de la secreción de acetilcolina en los ganglios simpáticos.
- Estos hallazgos apoyan la hipótesis de que el ATP inhibe directamente la liberación de acetilcolina.
- Los resultados desafían la noción de que el ATP debe ser hidrolizado a adenosina para ejercer efectos inhibidores.
Conclusiones:
- El ATP actúa como un inhibidor directo de la secreción de acetilcolina en los ganglios simpáticos.
- La potencia del ATP como inhibidor es mayor que la de la adenosina.
- Este estudio proporciona evidencia de un papel modulador directo del ATP en la neurotransmisión colinérgica.
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