Aging attenuates diurnal variation in hamster locomotion, anxiolysis and GABA turnover.
A decrease in amplitude of wheel running circadian rhythms was found in old (18 month old) Syrian hamsters, as compared with young (3 month old.) animals. In a plus-maze paradigm, amplitude of variation of anxiety-related variables (2400 vs. 1600 h) was significantly impaired in aged hamsters. Cerebral cortex, hypothalamic and pineal gamma-aminobutyric acid (GABA) turnover was higher at night, amplitude of variation being significantly smaller in aged hamsters. The results further support the existence of impaired amplitude of circadian rhythms in aged Syrian hamsters.
Golombek
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DA
Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires, Argentina. neurocie@fmed.uba.ar
Rosenstein
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RE
Yannielli
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PC
Keller Sarmiento
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MI
Cardinali
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DP
D000367:Age Factors; D000375:Aging / Q000378:metabolism / Q000502:physiology*; D000818:Animals; D001007:Anxiety / Q000503:physiopathology*; D002940:Circadian Rhythm / Q000502:physiology*; D006224:Cricetinae; D008124:Locomotion / Q000502:physiology*; D008297:Male; D005680:gamma-Aminobutyric Acid / Q000378:metabolism*
D005680:gamma-Aminobutyric Acid