, Volume 38, Issue 4, pp 513–514 | Cite as

Effect of light at night on the pineal rhythm in N-acetyltransferase activity in the Syrian hamsterMesocricetus auratus

  • J. Vaněček
  • Helena Illnerová


Pineal N-acetyltransferase activity in the male Syrian hamster exhibited a daily rhythm; the maximal night-time value was 3.5-fold higher than the day-time value. When hamsters were exposed to light at night N-acetyltransferase declined within 30 min to 1/5 of its former activity. These results indicate that in the Syrian hamster the pineal melatonin rhythm may be regulated at least partly via changes in N-acetyltransferase activity.


Melatonin Syrian Hamster Daily Rhythm Melatonin Rhythm Pineal Melatonin 
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Copyright information

© Birkhäuser Verlag 1982

Authors and Affiliations

  • J. Vaněček
    • 1
  • Helena Illnerová
    • 1
  1. 1.Institute of PhysiologyCzechoslovak Academy of SciencesPrague 4(Czechoslovakia)

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