Neurosecretory Cells: Daily Rhythmicity in Leiobunum longipes
- 20 May 1966
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 152 (3725), 1078-1080
- https://doi.org/10.1126/science.152.3725.1078
Abstract
A fluorometric-analysis procedure, used to quantitate indoles, confirmed the presence of 5-hydroxytryptamine (5-HT) in an arachnid; there was unimodal cyclic production of 5-HT in brain and intestinal tissues over a 24-hour period. The same tissues produced 5-HT after 80-day culture; bimodal cyclic output was indicated during continuous 24-hour study. One peak occurred at 0200 hours, at the same time as the peak in vivo, suggesting an endogenously controlled mechanism of secretion. The second peak occurred at midmorning, a time when production in vivo was lowest, suggesting that there is a possible feedback-control mechanism in the organism that inhibits the endogenous output of 5-HT.This publication has 8 references indexed in Scilit:
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