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Ecdysone |
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Ecdysone The molting hormone of insects. It is a derivative of cholesterol. The most striking physiological activity of ecdysone is the induction of puffs (zones of gene activity) in giant chromosomes of the salivary glands and other organs of the midge Chironomus. The induction of puffs has been visualized as primary action of the hormone, indicating that ecdysone controls the activity of specific genes. It has been shown that ecdysone stimulates the synthesis of messenger RNA, among which is the messenger for dopa decarboxylase. This enzyme is involved in the biosynthesis of the sclerotizing agent N-acetyl-dopamine. See Insecta |
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Granted, their reproduction is not regulated by steroids, but ecdysone, the molting hormone, is certainly a steroid. The insect hormone ecdysone may provide the most effective gene switch yet, suggest investigators from the Howard Hughes Medical Institute at the Salk Institute for Biological Studies in La Jolla, Calif. In arthropods, the molting hormone, ecdysone, is a steroid that is mimicked in some plants (34). |
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