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Journal of Biological Rhythms
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History-Dependent Changes in Entrainment of the Activity Rhythm in the Syrian Hamster (Mesocricetus auratus)

Juan J. Chiesa

Departament de Fisiologia, Facultat de Farmacia, Universitat de Barcelona, Barcelona, Spain, jchiesa{at}ub.edu

Montserrat Anglès-Pujolràs

Departament de Fisiologia, Facultat de Farmacia, Universitat de Barcelona, Barcelona, Spain

Antoni Díez-Noguera

Departament de Fisiologia, Facultat de Farmacia, Universitat de Barcelona, Barcelona, Spain

Trinitat Cambras

Departament de Fisiologia, Facultat de Farmacia, Universitat de Barcelona, Barcelona, Spain, cambras{at}ub.edu

The authors have studied the activity rhythm of Syrian hamsters exposed to square LD cycles with a 22-h period (T22) with the aim of testing the effects of the previous history on the rhythmic pattern. To do so, sequential changes of different lighting environments were established, followed by the same LD condition. Also, the protocol included T22 cycles with varying lighting contrasts to test the extent to which a computational model predicts experimental outcomes. At the beginning of the experiment, exposure to T22 with 300 lux and dim red light occurring respectively at photophase and scotophase (LD300/dim red) mainly generated relative coordination. Subsequent transfer to cycles with ~0.1-lux dim light during the scotophase (LD300/0.1) promoted entrainment to T22. However, a further reduction in light intensity to 10 lux during the photophase (LD10/0.1) generated weak and unstable T22 rhythms. When, after that, animals were transferred again to the initial LD300/dim red cycles, the amplitude of the rhythm still remained very low, and the phases were very unstable. Exposure to constant darkness partially restored the activity rhythm, and when, afterwards, the animals were submitted again to LD300/dim red cycles, a robust T22 rhythm appeared. The results demonstrate history-dependent changes in the hamster circadian system because the locomotor activity pattern under the same T22 cycle can show relative coordination or unstable or robust entrainment depending on the prior lighting condition. This suggests that the circadian system responds to environmental stimuli depending on its previous history. Moreover, computer simulations allow the authors to predict entrainment under LD300/0.1 cycles and indicate that most of the patterns observed in the animals due to the light in the scotophase can be explained by different degrees of coupling among the oscillators of the circadian system.

Key Words: entrainment • hamster • T cycle • coupling • multioscillatory model

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Journal of Biological Rhythms, Vol. 21, No. 1, 45-57 (2006)
DOI: 10.1177/0748730405283654
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