Add time:08/22/2019         Source:sciencedirect.com

The injection of β-ecdysone into chilled Hyalophora gloveri pupae resulted in the stimulation of adenyl cyclase activity in the wing epidermis as measured by the incorporation of label into cyclic AMP from a prelabeled endogenous pool. Stimulation was also obtained in pupal wings in vitro and in wing epidermal homogenates. Although the sequence of responses to β-ecdysone in vitro depended on the composition of the incubation medium, the stimulation of cyclic AMP synthesis always preceded increases in the rates of RNA and protein synthesis. The increase in adenyl cyclase activity is the earliest metabolic event thus far discerned as a result of β-ecdysone action. It is suggested that β-ecdysone stimulates adenyl cyclase (and guanyl cyclase) but that the hormone also exerts effects on target cells independent of the cyclic AMP system.

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