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Un costo de la memoria a largo plazo en Drosophila
Frederic Mery1, Tadeusz J Kawecki
1Section of Ecology and Evolution, Department of Biology, University of Fribourg, Chemin du Musée 10, CH-1700 Fribourg, Switzerland. frederic.mery@unifr.ch
Science (New York, N.Y.)
|May 21, 2005
Resumen
La formación de memoria a largo plazo en las moscas aumenta la susceptibilidad al estrés, a diferencia de la memoria resistente a la anestesia. Esta diferencia puede explicar la persistencia evolutiva de la memoria resistente a la anestesia.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Comportamiento animal Comportamiento animal.
- Biología Molecular Biología Molecular
Sus antecedentes:
- Drosophila melanogaster exhibe dos formas de memoria asociativa consolidada: la memoria a largo plazo (LTM) y la memoria resistente a la anestesia (ARM).
- La formación de LTM depende de la síntesis de proteínas y es más estable.
- La formación de ARM no requiere síntesis de proteínas.
Objetivo del estudio:
- Investigar los efectos diferenciales de la inducción de LTM y ARM en la resistencia al estrés en Drosophila.
- Comprender el significado adaptativo de los distintos mecanismos de consolidación de la memoria.
Principales métodos:
- Inducción de la memoria a largo plazo y la memoria resistente a la anestesia en Drosophila.
- Evaluación de la resistencia a la desecación como medida de la susceptibilidad al estrés extremo.
- Análisis comparativo de la resistencia al estrés entre las moscas sometidas a inducción LTM y ARM.
Principales resultados:
- Las moscas inducidas a formar memoria a largo plazo exhibieron una mayor susceptibilidad al estrés de desecación.
- La inducción de la memoria resistente a la anestesia no alteró significativamente la resistencia a la desecación.
- Se observó una clara distinción en la tolerancia al estrés basada en el tipo de memoria consolidada.
Conclusiones:
- La consolidación de la memoria a largo plazo incurre en un costo fisiológico, aumentando la vulnerabilidad a los factores estresantes ambientales.
- La consolidación de la memoria resistente a la anestesia no impone un costo de susceptibilidad al estrés similar.
- Las distintas consecuencias fisiológicas de la consolidación de LTM y ARM pueden explicar su coexistencia y mantenimiento evolutivo.
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