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Science 1 April 1983:
Vol. 220. no. 4592, pp. 82 - 84
DOI: 10.1126/science.6298939
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Articles

Science, Vol 220, Issue 4592, 82-84
Copyright © 1983 by American Association for the Advancement of Science

articles

Adenylate cyclase activation shifts the phase of a circadian pacemaker

A Eskin and JS Takahashi

Forskolin, a highly specific activator of adenylate cyclase, produced both delay and advance phase shifts of the circadian rhythm recorded from the isolated eye of the marine mollusk Aplysia. The phase dependence of the response to forskolin was identical to that with serotonin, which also stimulates adenylate cyclase in the eye. The ability of agents to activate adenylate cyclase in homogenates was correlated with their ability to shift the phase of the circadian oscillator. These results along with earlier findings show that adenosine 3',5'-monophosphate mediates the effect of serotonin on the rhythm and regulates the phase of the circadian pacemaker in the eye of Aplysia.


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