Melatonin entrainment of the circadian N-acetyltransferase rhythm in the newborn rat pineal gland

  • Trávníčková Z
  • Illnerová H
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In 15-day-old control and vehicle-treated rats, the evening rise of the pineal N-acetyltransferase occurred at the same time as in their mothers, whereas in 5-day-old pups, the rise occurred by 2-3 hr earlier. Four-day administration of melatonin in the late day phase advanced the N-acetyltransferase rise in 15-day-old rats as compared with the rise in the vehicle-treated animals; a slight melatonin induced phase advance in 5- and 27-day-old rats was not significant. The data indicate that the newborn rat's circadian pacemaker controlling the rhythmic N-acetyltransferase rise may be entrained by exogenous melatonin. It appears, however, that the maternal melatonin transferred via milk cannot entrain the pup's pacemaker by phase advancing it, since the N-acetyltransferase rise in the pups begins earlier or at the same time as maternal melatonin production driven by the N-acetyltransferase rhythm. © Munksgaard, Copenhagen.

Author-supplied keywords

  • Circadian entrainment
  • Melatonin
  • Newborn rat
  • Pineal gland

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  • Zdeňka Trávníčková

  • Helena Illnerová

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