Document Detail

Entrainment of the rat pineal rhythm in melatonin production by light.
MedLine Citation:
PMID:  3413344     Owner:  NLM     Status:  MEDLINE    
Environmental light entrains the rat pineal N-acetyltransferase rhythm which controls melatonin production. One day after 1 min light pulses applied before midnight, or after delays in the evening switch off of light, or after a delay of the light-dark cycle, the evening N-acetyltransferase rise and the morning decline are phase delayed almost to the same extent. Consequently, the pattern of the rhythm does not change. One day after 1 min light pulses applied past midnight, or after bringing forward the morning light onset, or after an advance of the light dark-cycle, the morning N-acetyltransferase decline is phase advanced, but the evening rise is either not phase shifted or it may be even phase delayed. Consequently, the pattern of the rhythm may be changed considerably or the rhythm may be abolished. The data are consistent with an hypothesis of a two-component pacemaker controlling the N-acetyltransferase rhythm. Under all photoperiods which we encounter in nature, the pattern of the N-acetyltransferase rhythm is determined by the entraining effect of light on the pacemaker, but not by the suppressant effect of light.
H Illnerová; J Vanĕcek
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Reproduction, nutrition, development     Volume:  28     ISSN:  0181-1916     ISO Abbreviation:  Reprod Nutr Dev     Publication Date:  1988  
Date Detail:
Created Date:  1988-10-06     Completed Date:  1988-10-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8005903     Medline TA:  Reprod Nutr Dev     Country:  FRANCE    
Other Details:
Languages:  eng     Pagination:  515-26     Citation Subset:  IM    
Institute of Physiology, Czechoslovak Academy of Sciences, Prague.
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MeSH Terms
Acetyltransferases / metabolism*
Melatonin / biosynthesis*,  secretion
Pineal Gland / enzymology,  physiology*
Reg. No./Substance:
73-31-4/Melatonin; EC 2.3.1.-/Acetyltransferases

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