The portacaval sham operation in rats affects acquisition but not memory of an active avoidance task
- López Álvarez, Laudino 1
- Méndez López, Marta 1
- Méndez López, Magdalena
- Aller Reyero, María Angeles
- Arias Pérez, Jaime
- Díaz Fernández, Fernando
- Arias Pérez, Jorge Luis 1
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1
Universidad de Oviedo
info
ISSN: 2171-2069
Year of publication: 2010
Volume: 1
Issue: 1
Pages: 81-99
Type: Article
More publications in: Revista iberoamericana de psicología y salud
Abstract
La encefalopatía hepática es una de las enfermedades más importantes y es objeto de estudio por muchos grupos de investigación. Uno de los modelos más frecuentemente utilizados para su estudio es la derivación portocava. El estudio de este modelo requiere de la realización de un grupo intervenido quirúrgicamente y un grupo pseudooperado que funciona como control. Nuestro objetivo es examinar si la pseudo-operación produce alteraciones fisiológicas o comportamentales en los animales. Estudiamos dos grupos de ratas: ratas que fueron sometidas a una pseudo-operación, consistente en una laparotomía seguida de clampaje de la vena porta y la vena cava inferior durante 15 minutos, y un grupo control no operado. Los animales fueron sometidos a pruebas de comportamiento y se determinaron los niveles de testosterona y corticosterona en plasma. Las ratas pseudo-operadas se comportaron de forma ligeramente diferente a las ratas control en el campo abierto, tendiendo a caminar más en la zona central. En la piscina de Morris, aprendieron la tarea un día después que el grupo control. En la prueba de aprendizaje asociativo, la pseudo-operación impidió que las ratas fueran capaces de aprender la tarea. Sin embargo, la pseudooperación no interfirió en la capacidad de las ratas para recordar una tarea que anteriormente habían aprendido. El grupo pseudo-operado presentó niveles más altos de corticosterona en plasma que los controles. Sería necesario reconsiderar cuál es el grupo control más apropiado para la derivación portocava.
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