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La desensibilización del receptor mu-opioide por beta-arrestina-2 determina la tolerancia a la morfina, pero no la
L M Bohn1, R R Gainetdinov, F T Lin
1Howard Hughes Medical Institute Laboratories, Department of Cell Biology, Duke University Medical Center, Durham, North Carolina 27710, USA.
Nature
|December 29, 2000
Resumen
La beta-arrestina-2 es crucial para la tolerancia a la morfina. Los ratones que carecen de betaarrestina-2 no desarrollan tolerancia a la morfina.
Área de la Ciencia:
- Farmacología Farmacología.
- La neurociencia es la neurociencia.
- Biología Molecular Biología Molecular
Sus antecedentes:
- La morfina es un analgésico clave, pero causa tolerancia y dependencia.
- La tolerancia a los opiáceos implica una reducción de la eficacia del fármaco con el uso continuo.
- La desensibilización de los receptores, mediada por las beta-arrestinas, está implicada en la tolerancia.
Objetivo del estudio:
- Para investigar el papel de la beta-arrestina-2 en la tolerancia antinociceptiva a la morfina.
- Para determinar si la deficiencia de beta-arrestina-2 afecta la dependencia física de la morfina.
Principales métodos:
- Utilizó ratones nocaut que carecían de beta-arrestina-2 (beta arr2-/-).
- Se administra morfina crónica para evaluar la tolerancia a los antinociceptivos.
- Se midió la desensibilización del receptor mu-opioide y la actividad de la adenilil ciclasa.
Principales resultados:
- Los ratones que carecían de beta-arrestina-2 no desarrollaron tolerancia antinociceptiva a la morfina.
- La desensibilización del receptor mu-opioide se evitó en los ratones knockout de beta-arrestina-2.
- La dependencia física, indicada por la regulación ascendente de la adenilil ciclasa, todavía ocurría.
Conclusiones:
- La beta-arrestina-2 es esencial para el desarrollo de la tolerancia antinociceptiva inducida por la morfina.
- La tolerancia y la dependencia física de la morfina se pueden disociar.
- La orientación de la beta-arrestina-2 puede ofrecer estrategias para el manejo de la tolerancia a los opiáceos.
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