Cannabinoides y conducta adictiva

M. Navarro, F. Rodríguez de Fonseca

Resumen


Los cannabinoides son compuestos psicoactivos presentes en el cannabis y que actúan en el sistema nervioso a través de receptores específicos de membrana, los receptores CB-1. Estos receptores están situados en neuronas de muchos circuitos encefálicos, incluyendo el sistema de recompensa cerebral. Este sistema es clave para entender la conducta adictiva, y de él forman parte las neuronas dopaminérgicas mesotelencefálicas, así como algunas neuronas peptidérgicas de entre las que destacan las neuronas encefalinérgicas. Los cannabinoides, al igual que el resto de las drogas de abuso, activan las neuronas mesotelencefálicas y disminuyen el umbral de recompensa cerebral. Del mismo modo que la cocaína, los opiáceos o el etanol, estos compuestos inducen conductas de autoadministración en animales de experimentación y provocan condicionamiento de lugar preferencial. La administración crónica de cannabinoides provoca tolerancia y dependencia, e induce neuroadaptaciones en el circuito de la recompensa que son idénticas a las inducidas por la principales drogas de abuso y que se pueden poner de manifiesto mediante el cese de la administración de estos compuestos (síndrome de abstinencia comportamental y bioquímico específico). Los cannabinoides actúan sinérgicamente con el sistema opioide endógeno, en especial con el sistema encefalinas-receptor-F -opioide, lo que les permite actuar como factores de vulnerabilidad en el desarrollo de la conducta adictiva. La existencia de una interacción opioide-cannabinoide permitirá abrir nuevas puertas terapéuticas para la adicción a heroína y a etanol. 


Palabras clave


cannabis; sistema cannabinoide; adicción; dopamina; sistema de recompensa; modelos animales; opiáceos; cerebro; dependencia

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Referencias


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DOI: https://doi.org/10.20882/adicciones.674

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