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A short red light pulse during dark phase of LD-cycle perturbs the hamster's circadian clock

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Abstract

In this study we investigated the influence of red light, which naturally occurs during dawn and dusk, on locomotor activity and body temperature rhythms of Djungarian hamsters (Phodopus sungarus). A single weak red light pulse given 2 h before regular lights on had acute as well as long-term effects persisting for several days following exposure. The hamsters immediately stopped their locomotor activity, accompanied by a drop in body temperature. In the following undisturbed nights (LD 16∶8) the nocturnal activity stopped earlier than usual. This lasting effect of the light pulse was more pronounced than the acute effect. The activity phase compressed gradually during 3 to 5 days after the light pulse was administered while time of activity onset was almost unaffected. It took 6 to 11 days for complete recovery of the original activity phase. The maximal activity compression and the recovery period depended on the duration of the single red light pulse and its intensity. Red light pulses of 15 min duration were about twice effective as 1 min pulses; and the effect of a red light pulse of 130 mW/m2 was about 1.5 times stronger than a 30 mW/m2 red light pulse. The maximal value of activity phase compression reached in this experiment was 2.5+0.2 h with a recovery period of 11.1±0.3 days following a given red light pulse of 90 mW/m2 and 15 min. The “morning oscillator” seems to be persistently affected. This indicates a very high photosensitivity of the Djungarian hamster's circadian system to red light.

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Abbreviations

T b :

body temperature

DD :

constant darkness

LD :

light:dark cycle

LL :

constant light

α:

duration of activity phase

CT :

circadian time

PRC :

phase response curve

SCN :

suprachiasmatic nuclei

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Authors and Affiliations

  1. Institut für Zoologie, Tierärztliche Hochschule Hannover, D-30559, Hannover, Germany

    G. Klante & S. Steinlechner

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  1. G. Klante
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  2. S. Steinlechner
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Klante, G., Steinlechner, S. A short red light pulse during dark phase of LD-cycle perturbs the hamster's circadian clock. J Comp Physiol A 177, 775–780 (1995). https://doi.org/10.1007/BF00187636

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  • DOI: https://doi.org/10.1007/BF00187636

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