Effects of 17 b-estradiol and extremely low-frequency electromagnetic fields on social recognition memory in female rats: A possible interaction?

We have investigated a potential memory-enhancing effect of exposure to extremely low-frequency electromagnetic fields (ELF EMF) in female rats and its dependence on estrogen, using a social recognition task. A juvenile social recognition paradigm was used and memory retention tested at 30 and 300 m...

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Bibliographic Details
Published in:Brain research 2006-06, Vol.1095 (1), p.131-138
Main Authors: Reyes-Guerrero, Gloria, Vázquez-García, Mario, Elias-Viñas, David, Donatti-Albarrán, Olga A., Guevara-Guzmán, Rosalinda
Format: Article
Language:English
Subjects:
Age Factors
Analysis of Variance
Animals
Animals, Newborn
Behavior, Animal
Behavioral psychophysiology
Biological and medical sciences
Electromagnetic field
Electromagnetic Fields
Estradiol - pharmacology
Estrogen
Estrous Cycle - physiology
Exploratory Behavior - drug effects
Exploratory Behavior - radiation effects
Female
Fundamental and applied biological sciences. Psychology
Hormones and behavior
Learning
Motor Activity - drug effects
Motor Activity - radiation effects
Olfactory memory
Ovariectomy - methods
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Rats
Rats, Wistar
Recognition (Psychology) - drug effects
Recognition (Psychology) - physiology
Recognition (Psychology) - radiation effects
Short-term memory
Social Behavior
Time Factors
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Summary:We have investigated a potential memory-enhancing effect of exposure to extremely low-frequency electromagnetic fields (ELF EMF) in female rats and its dependence on estrogen, using a social recognition task. A juvenile social recognition paradigm was used and memory retention tested at 30 and 300 min after an adult was exposed to a juvenile during two 4-min trials. Results showed that an intact social recognition memory was present at 30 min in both gonadally intact and ovariectomized rats with, or without, ELF-EMF. However, whereas gonadally intact control females failed to show retention of the recognition memory at 300 min, those additionally exposed to ELF EMF did. This shows that the enhanced duration effect of ELF EMF on social recognition memory occurs in gonadally intact females as well as in males. In addition, results showed that the ELF EMF facilitation of memory retention was prevented by ovariectomy but restored by exogenous treatment with estrogen. This suggests that this ELF EMF effect on social recognition memory is estrogen-dependent.
ISSN:0006-8993
1872-6240
DOI:10.1016/j.brainres.2006.04.020