...-organ, Mm-Rheb mRNA levels decreased with increasing temperature and increased during premoult, and were positively correlated with haemolymph ecdysteroid titre. In the heart, moult stage had no effect on mTOR signalling gene mRNA levels; only Mm-Rheb , Mm-S6K and Mm-mTOR mRNA levels were higher...

...-inhibiting hormone (MIH), which suppresses production of ecdysteroids by the Y-organ (YO). MIH signaling involves nitric oxide and cGMP in the YO, which expresses nitric oxide synthase (NOS) and NO-sensitive guanylyl cyclase (GC-I). Molting can generally be induced by eyestalk ablation (ESA), which removes...

...Kyle S. MacLea; Ali M. Abuhagr; Natalie L. Pitts; Joseph A. Covi; Brandon D. Bader; Ernest S. Chang; Donald L. Mykles SUMMARY Molt-induced claw muscle atrophy in decapod crustaceans facilitates exuviation and is coordinated by ecdysteroid hormones. There is a 4-fold reduction in mass accompanied...

...Sung Gu Lee; Brandon D. Bader; Ernest S. Chang; Donald L. Mykles SUMMARY Two eyestalk (ES) neuropeptides, molt-inhibiting hormone (MIH) and crustacean hyperglycemic hormone (CHH), increase intracellular cGMP levels in target tissues. Both MIH and CHH inhibit ecdysteroid secretion by the molting...

... nutrient stores to develop eggs. To determine how larval nutrition affects the endocrinology of egg development in these females, we manipulated the quantity of larval food and measured in vitro production of juvenile hormone (JH) by corpora allata (CA) and ecdysteroids by ovaries. Newly emerged A. aegypti...

...Xiaofeng Zhou; Baohua Zhou; James W. Truman; Lynn M. Riddiford SUMMARY Insect molting is triggered by ecdysteroids, which are produced in the prothoracic glands (PG). The broad ( br ) gene is one of the`early genes' directly regulated by ecdysteroids. Ectopic expression of the BR-Z3 isoform...

... ecdysone-responsive elements are present in all three promoters. Taken together, our results suggest that the expression of V-ATPase genes is controlled in a coordinated manner by ecdysteroids. * Author for correspondence (e-mail: [email protected] ) 7 2 2002 ©...

... of the epitracheal glands. Here, we show that the developmental events preceding larval and pupal ecdysis of Manduca sexta involve a dual action of ecdysteroids on the epitracheal glands and CNS. The low steroid levels in freshly ecdysed and feeding larvae are associated with small-sized epitracheal glands, reduced...

...Timothy G. Kingan; Michael E. Adams ABSTRACT Ecdysis, or molting behavior, in insects requires the sequential action of high levels of ecdysteroids, which induce accumulation of ecdysis-triggering hormone (ETH) in Inka cells, followed by low levels of ecdysteroids, permissive for the onset...

...Randall S. Hewes ABSTRACT The ventromedial cells (VM cells) of the moth Manduca sexta belong to a peptide hormone signaling hierarchy that directs an episodic and stereotyped behavior pattern, ecdysis. The VM cells respond to declining ecdysteroid titers at the end of the final larval molt...

...Oliver S. Dominick; James W. Truman ABSTRACT Prior to exposure to ecdysteroids, the isolated central nervous system (CNS) of the fifth instar Manduca sexta larvae exhibited infrequent motor bursts over a 24-h period of extracellular recording from segmental motor nerves. In contrast, the CNS...

... and Biophysics, School of Medicine, University of Washington, seattle, Washington, U.S.A. 12 01 1984 © 1984 by Company of Biologists 1984 Cell death ecdysteroid muscle eclosion hormone Programmed cell death is a fundamental component of development in most multicellular...