| Literature DB >> 2809584 |
J Stehle1, J Vanecek, L Vollrath.
Abstract
Circadian rhythms, endogenously generated in suprachiasmatic nuclei (SCN), seem to be under the direct influence of melatonin. Therefore, the effect of iontophoretically applied melatonin on electrical activity of SCN neurons was investigated in vitro. Usually, melatonin had an inhibitory effect. In the 3-h periods before (2.00-5.00 p.m.) or after (5.00-8.00 p.m.) the light-dark transition the percentage of SCN neurons sensitive to melatonin was very high (80% and 100%, respectively). However, efficacy of melatonin was low in the periods preceeding (20%) and following (33%) this 6-h time interval.Entities:
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Year: 1989 PMID: 2809584 DOI: 10.1007/bf01252503
Source DB: PubMed Journal: J Neural Transm Impact factor: 3.575