Biochemical control of moulting hormone titer in Calliphora erythrocephala during puparium formation

Young, Nancy L.; Young, Paul R.

doi:10.1016/0020-1790(76)90027-5

Cited by 16 publications

(1 citation statement)

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“…Others have reported that 20E catabolism in insects can vary over larval-pupal stages (reviewed by Lehmann and Koolman, 1989). As in the lobster molt cycle, 20E was lost at a faster rate when molting hormone tilers were increasing in the blowfly Calliphora vicina (Young, 1976;Young and Young, 1976;Koolman and Walter, 1985) and in the tobacco hornworm Manduca sexta (reviewed by Gilbert, 1989). The potential roles of 20E catabolic aclivity in the regulation of crustacean ecdysleroid lilers require further study.…”

Section: Discussionmentioning

confidence: 99%

Metabolism and Excretion of Injected [3H]-Ecdysone by Female Lobsters, Homarus americanus

Snyder¹,

Chang²

1991

The Biological Bulletin

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The dynamics of ecdysteroid metabolism and excretion were followed in adult lobsters, Homarus americanus. Females at five different molt stages were injected with [3H]-ecdysone. Levels of [3H]-20-hydroxyecdysone (20E), converted from [3H]-ecdysone, rose rapidly and remained significantly higher in premolt stages D0 and D1. In contrast, significant increases in the levels of highly polar ecdysteroid metabolites (HP) occurred primarily in stages A and C. Changes in the hemolymph levels of 20E and HP in hemolymph over the molt cycle suggest additional metabolic mechanisms by which the titers of active molting hormones can be regulated. Excretion of [3H]-ecdysteroids was slower during early premolt stages D0 and D1, suggesting that this reduced rate may be an additional mechanism for regulating ecdysteroid titers. Study of [3H]-ecdysteroids indicated that metabolism proceeds primarily to HP that are excreted in the urine with unaltered ecdysteroids. An additional ecdysteroid metabolic route was found in the midgut gland; this route removes ecdysteroids from the hemolymph and transforms them into apolar metabolites prior to their excretion in the feces. This route is similar to that previously found for ingested [3H]-ecdysone, which was converted to apolar conjugates without further absorption.

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Section: Discussionmentioning

confidence: 99%