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Relación entre la ansiedad y el desarrollo del tinnitus en un modelo de rata
Jack W Zimdahl1, Kady J Braack1, Jennifer Rodger2
1School of Human Sciences, University of Western Australia, Crawley, WA 6009, Australia.
Behavioural brain research
|September 6, 2025
Resumen
El estrés temprano de la vida, modelado por la exposición a la dexametasona, aumentó la ansiedad en ratas. Los animales con mayor ansiedad antes del trauma acústico mostraron signos de tinnitus, lo que sugiere que la ansiedad influye en la susceptibilidad al tinnitus.
Área de la Ciencia:
- La neurociencia
- Ciencias de la audición
- Ciencias del comportamiento
Sus antecedentes:
- El tinnitus afecta al 15% de las personas y está relacionado con la pérdida de audición.
- La ansiedad puede contribuir al tinnitus debido a las vías neuronales compartidas entre los sistemas auditivo y límbico.
Objetivo del estudio:
- Investigar el impacto de la ansiedad inducida por el estrés en el desarrollo del tinnitus.
- Utilice un modelo de ratas con estrés temprano en la vida para explorar el papel de la ansiedad en el tinnitus.
Principales métodos:
- La exposición neonatal a la dexametasona (DEX) para inducir un comportamiento similar a la ansiedad.
- Exposición al trauma acústico (TA) para evaluar el desarrollo del tinnitus.
- Pruebas de comportamiento (sorpresa acústica, laberinto elevado) y grabaciones neuronales en el núcleo geniculado medial.
Principales resultados:
- La exposición a DEX aumentó el comportamiento similar a la ansiedad en las pruebas de sobresalto acústico.
- No hay diferencia en la proporción de tinnitus entre los grupos DEX y de control.
- El desarrollo del tinnitus se correlacionó con niveles más altos de ansiedad pre-traumática.
- Las ratas con tinnitus mostraron tasas de disparo neuronales alteradas en el núcleo geniculado medial.
Conclusiones:
- La ansiedad está relacionada con la susceptibilidad al tinnitus, no necesariamente con su desarrollo.
- Los hallazgos apoyan las observaciones clínicas de la correlación ansiedad-tinnitus.
- El estrés de los primeros años de vida puede estimular los circuitos neuronales para el desarrollo del tinnitus.
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