Endogenous ecdysteroid levels and rates of ecdysone acylation by intact ovaries in vitro in relation to ovarian development in adult female crickets, Acheta domesticus

Archives of Insect Biochemistry and Physiology
P WhitingL Dinan

Abstract

Ecdysteroid titres have been determined in adult female house crickets (Acheta domesticus) in relation to reproductive maturation. Ecdysteroid levels in newly emerged adult females are low except in the gut and carcass, which probably reflects the remnants of the preecdysial ecdysteroid peak. Ecdysteroid levels in all compartments increase markedly once ovarian weight surpasses 10 mg. Apolar ecdysteroid conjugates (ecdysone 22-fatty acyl esters) predominate in ovarian tissue throughout ovarian maturation, but low levels of free ecdysteroid and polar conjugated ecdysteroids are also present. During this period, two peaks of ecdysteroids (mainly free and apolar conjugated ecdysteroids) are observed in the haemolymph, gut, and carcass compartments. The peaks in the haemolymph occur when the ovarian mass reaches 30 and 100 mg. The gut and carcass may be acting as sinks or sites of metabolism for the hormone released from the ovaries. The rate of ecdysone acylation by ovaries was found to be developmentally regulated, increasing from low levels in the immature ovaries of newly emerged females as the ovaries increase in size. A semiquantitative assay has been developed to identify compounds which inhibit the conversion of [3H]ecdyson...Continue Reading

References

Oct 1, 1978·Hoppe-Seyler's Zeitschrift für physiologische Chemie·F GoltzenéJ A Hoffmann
Jan 1, 1977·Journal of Insect Physiology·M LagueuxJ A Hoffmann
Jul 29, 1988·Biochemical and Biophysical Research Communications·S L Smith, M J Mitchell

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Citations

Apr 26, 2003·General and Comparative Endocrinology·Grégory Pourié, Marie Trabalon

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