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La activación cruzada unidireccional de GRPR por MOR1D desacopla la picazón y la analgesia inducidas por los opioides
Xian-Yu Liu1, Zhong-Chun Liu, Yan-Gang Sun
1Center for the Study of Itch, Washington University School of Medicine Pain Center, St. Louis, MO 63110, USA.
Cell
|October 18, 2011
Resumen
La picazón espinal inducida por opioides es un proceso activo separado del alivio del dolor. La isoforma del receptor de microopioides 1D (MOR1D) y la vía del receptor de péptido liberador de gastrina (GRPR) en la médula espinal son clave para este efecto secundario.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Farmacología Farmacología.
- Manejo del dolor Manejo del dolor.
Sus antecedentes:
- La picazón espinal inducida por opioides es un efecto secundario común del manejo del dolor.
- Las teorías anteriores vinculaban la picazón con la inhibición del dolor.
Objetivo del estudio:
- Para investigar los mecanismos moleculares específicos que subyacen a la picazón espinal inducida por opioides.
- Para diferenciar las vías para la picazón inducida por opioides frente a la analgesia.
Principales métodos:
- Investigó las funciones de las isoformas del receptor de micro-opioides (MOR) MOR1D y MOR1.
- Examinó la interacción entre MOR1D y el receptor de péptido liberador de gastrina (GRPR).
- Utilizó la inhibición molecular y farmacológica de efectores aguas abajo como PLCβ3 e IP3R3.3.
Principales resultados:
- MOR1D, no MOR1, es esencial para el rascado inducido por morfina (MIS).
- MOR1D heterodimeriza con GRPR en la médula espinal para transmitir señales de picazón.
- La morfina desencadena la internalización de GRPR y MOR1D; la GRP desencadena la internalización de GRPR de manera independiente.
- La inhibición de la asociación PLCβ3, IP3R3 o MOR1D-GRPR bloquea específicamente el MIS, no la analgesia inducida por la morfina (MIA).
Conclusiones:
- La picazón inducida por opiáceos es un proceso activo, independiente de la analgesia.
- La vía MOR1D-GRPR media la picazón inducida por opiáceos a través de la activación cruzada unidireccional.
- Esta vía ofrece objetivos potenciales para prevenir la picazón inducida por opioides sin afectar el alivio del dolor.
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