The influence of the brain hormone on retention of blood in the mid-gut of the mosquito Aedes aegypti (L.). III. The involvement of the ovaries and ecdysone

Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character
S J Cole, J D Gillett

Abstract

Most female mosquitoes require a blood-meal in order to produce mature oöcytes. An egg development neurosecretory hormone (EDNH), which is produced in the medial neurosecretory cells (m.n.c.) of the brain and stored in the corpus cardiacum, is released into the haemolymph following the ingestion of blood and is essential for the promotion of ovarian development to maturity. It has been shown that a factor from the m.n.c., presumably EDNH, is necessary if the blood-meal is to be retained in the mid-gut until the oöcytes approach maturity. The present paper shows that retention is not a direct result of the action of EDNH, but is dependent on the ovaries and may well involve ecdysone. Removal of the ovaries before a blood-meal leads to early haem-defaecation, but delay can be restored by injection of ecdysterone. Sub-threshold feeders and mosquitoes decapitated immediately after the intake of blood, each of which would be expected to eliminate the blood-meal early, also show a delay in the onset of haem-defaecation when injected with ecdysterone. Further, both in ovariectomized insects and sub-threshold feeders the time of onset of haem-defaecation is associated with the dose of ecdysterone given.

References

Jun 23, 1978·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·S J Cole, J D Gillett
Aug 19, 1975·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·J D GillettD Reeves
Aug 1, 1975·Proceedings of the National Academy of Sciences of the United States of America·H H HagedornM K Bohm
Jan 1, 1967·Journal of Insect Physiology·A O Lea
Oct 1, 1971·Journal of Insect Physiology·A SpielmanW A Anderson
Dec 1, 1956·Annals of Tropical Medicine and Parasitology·J D Gillett
Dec 1, 1956·Annals of Tropical Medicine and Parasitology·J D Gillett

Citations

Jan 1, 1982·Policy Studies Review·R H Blank, J M Ostheimer
Sep 9, 2010·European Journal of Applied Physiology·Igor StirnVojko Strojnik

Related Concepts

Aedes
Metazoa
Blood
Brain
Castration
Gastrointestinal System
Ecdysone
Ecdysterone
Heme
Insect Hormones

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