Document Detail

Melatonin, serotonin, 5-hydroxyindole-3-acetic acid and N-acetyltransferase in the pineal of the European hamster (Cricetus cricetus) kept under natural environmental conditions: lack of a day/night rhythm in melatonin formation in spring and early summer.
MedLine Citation:
PMID:  2468756     Owner:  NLM     Status:  MEDLINE    
In female European hamsters killed in spring and early summer, pineal melatonin content exhibited no day/night rhythm. Absolute levels measured were relatively low, being on the order of daytime levels detected in other hamster species. An absence of day/night changes in the activity of N-acetyltransferase was also observed. However, a marked rhythm in pineal serotonin (5-HT) was found, an abrupt large increase being observed at the beginning of the light period. The day/night rhythm of pineal 5-HIAA content is similar to that of 5-HT. This absence of rhythm in pineal melatonin formation might mean that in the European hamster it is not melatonin but another substance that is of importance in photoperiodism. An absence of melatonin rhythm, however, could also be simply a peculiar pattern of melatonin production observed at a given period of the year. In this case, melatonin would be able to transduce photoperiodic information in the European hamster, as in other photoperiodic species.
P Pévet; B Vivien-Roels; M Masson-Pévet; S Steinlechner; D Skene; B Canguilhem
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of pineal research     Volume:  6     ISSN:  0742-3098     ISO Abbreviation:  J. Pineal Res.     Publication Date:  1989  
Date Detail:
Created Date:  1989-06-08     Completed Date:  1989-06-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8504412     Medline TA:  J Pineal Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  233-42     Citation Subset:  IM    
Laboratoire de Zoologie CNRS URA 226 Neurobiologie des Fonctions Rhythmiques et Saisonnieres, Strasbourg, France.
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MeSH Terms
Acetyltransferases / metabolism*
Circadian Rhythm
Hydroxyindoleacetic Acid / analysis*
Melatonin / metabolism*
Pineal Gland / metabolism*
Serotonin / metabolism*
Reg. No./Substance:
50-67-9/Serotonin; 54-16-0/Hydroxyindoleacetic Acid; 73-31-4/Melatonin; EC 2.3.1.-/Acetyltransferases

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