Does ovarian ecdysone stimulate mosquitoes to synthesize vitellogenin? |
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Authors: | Dov Borovsky Emile Van Handel |
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Affiliation: | Florida Medical Entomology Laboratory, P.O. Box 520, Vero Beach, FL 32960, U.S.A. |
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Abstract: | Physiological amounts of 20-hydroxyecdysone do not initiate vitellogenin synthesis in unfed, non-vitellogenic mosquitoes. Injecting more than 10,000 times the physiological amount induced synthesis, but considerably less than was induced by a blood meal. A dose of 20-hydroxyecdysone which exceeded the physiological level only several hundred times, did not sustain vitellogenin synthesis, when blood-fed mosquitoes were ovariectomized just prior to injection. Transplanting ovaries from vitellogenic to non-vitellogenic females did not initiate synthesis of vitellogenin in the recipient. In vitro, neither 20-hydroxyecdysone nor the ovaries of vitellogenic females were able to induce synthesis of vitellogenin in non-vitellogenic fat bodies. These experiments suggest that ecdysteroid, released by the ovaries, does not initiate ovarian development in mosquitoes. |
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Keywords: | Mosquito ecdysteroid fat body ovary vitellogenin |
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