Pineal N-acetyltransferase activity in hamsters maintained in shortened light cycles
Journal of Endocrinological Investigation: Official Journal of the Italian Scociety of Endocrinology, ISSN: 1720-8386, Vol: 2, Issue: 1, Page: 19-23
1979
- 5Citations
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Article Description
Pineal serotonin N-acetyltransferase activity (NAT) was compared among Syrian hamsters maintained in light: dark (LD) cycles of 14:10 or 2:22 or in an interrupted (LD 1/4:5 3/4 × 4) photoperiodic cycle. In hamsters maintained in a LD 14:10 photoperiod, the zenith of pineal NAT activity occurs at 04:00 h, approximately 8 hours after the onset of the dark phase. When the onset of the dark phase was advanced by 8 hours (in hamsters maintained in LD 2:22 cycles), the pineal NAT activity was advanced by an equivalent length of time. Hamster pineal NAT activity was sup-pressed throughout a 24-hour period when the animals were maintained in darkness interrupted with brief periods of light at 6 h intervals (LD 1/4:5 3/4 × 4). The results suggest that melatonin syn-thesis is determined according to when light occurs during the photoperiodic cycle rather than by the total amount of darkness or the dark: light ratio to which animals are exposed in a 24-hour period. © 1979, Italian Society of Endocrinology (SIE). All rights reserved.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0018778437&origin=inward; http://dx.doi.org/10.1007/bf03349271; http://www.ncbi.nlm.nih.gov/pubmed/489913; http://link.springer.com/10.1007/BF03349271; http://link.springer.com/content/pdf/10.1007/BF03349271; https://dx.doi.org/10.1007/bf03349271; https://link.springer.com/article/10.1007/BF03349271
Springer Science and Business Media LLC
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