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- W2013462016 abstract ". The oocytes of 3-day-old unfed Aedes aegypti mosquitoes are in a state of oogenic arrest, but microgram doses of ecdysterone stimulate their accumulation of a variable amount of yolk. We now find that these doses also induce the deposition of plaques of vitelline envelope by the follicle cells, and with transmission electron microscopy we have compared their formation with that in normal blood-fed females. Plaques in the experimental animals were abnormally large and irregular in shape and distribution. In part, these abnormalities were attributable to the fact that the follicle cells remain in close contact with the oocyte, whereas the space between follicle cells and oocyte increase significantly in the blood-fed female. Deposition of the plaques occurred earliest after the injection of 5 μg ecdysterone, but even at this high dose the amount of plaque material deposited was less than in the blood-fed controls. Induction of the deposition of abnormal vitelline envelope in unfed females was most clearly demonstrated after two injections, 1 μg ecdysterone each, 14h apart; 24h after the second injection, the plaques had prematurely fused into a thin disorganized envelope. When females were injected with ecdysterone immediately after a blood-meal, vitelline envelope plaques formed prematurely, and their structure became increasingly abnormal with time. This early onset of activity was characteristic of follicle cells adjacent both to the oocyte and to nurse cells. Thus, the factors that normally control the formation and organization of the vitelline envelope are absent in the unfed female stimulated with high doses of ecdysterone, while in the blood-fed females, excessive ecdysterone apparently interferes with the timing and orderly sequence of envelope formation." @default.
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- W2013462016 date "1982-03-01" @default.
- W2013462016 modified "2023-09-24" @default.
- W2013462016 title "Abnormal vitelline envelope induced by unphysiological doses of ecdysterone in Aedes aegypti" @default.
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- W2013462016 doi "https://doi.org/10.1111/j.1365-3032.1982.tb00666.x" @default.
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