Abstract
Factors which could account for increased levels of brain cycle AMP during the initiation of pupal-adult metamorphosis were examined in silkmoths. Cyclic nucleotide phosphodiesterase activity of whole brain homogenates was not depressed after the initiation of adult development. Adenylate cyclase activity was assayed in brain homogenates and in a partially purified membrane particle preparation. Parallel agonist and antagonist studies suggest that a substance with an active site resembling 5-hydroxytryptamine may be the natural activator of brain cyclase.
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