PMID: 12770405May 29, 2003Paper

Arguments for two distinct gonadotropic activities triggered by different domains of the ovary maturating parsin of Locusta migratoria

Journal of Insect Physiology
J GirardieA Girardie

Abstract

To complete previous results concerning the role of the ovary maturating parsin of Locusta migratoria (Lom OMP), we determined, by an enzyme immunoassay, the titers of circulating ecdysteroids and analyzed circulating vitellogenin (Vg) and oöcyte growth following (1) suppression of 20 hydroxyecdysone (20E) and (2) injection of the Lom OMP, either as an entire molecule in allatectomized adults or as smaller peptides in allatectomized fifth-instar larvae females. Titers of ecdysteroids appeared unrelated to the presence of circulating Vg but increased during the first phase of vitellogenesis and injection of OMP accelerated the occurrence of circulating 20E. Nevertheless, immunoneutralization of 20E at the beginning of adult life delayed but did not prevent rapid oöcyte growth contrary to immunoneutralization of Lom OMP suggesting an additive gonadotropic effect of the neurohormone, distinct from that of 20E. Of two synthetic peptides corresponding to the C- and N-terminal gonadotropic domains of the OMP, respectively, only the C-terminal peptide was able to induce Vg in allatectomized larvae. After metamorphosis, injection of OMP did not induce Vg in adults allatectomized at the beginning of imaginal life but improved the mainte...Continue Reading

Citations

Dec 19, 2002·Archives of Insect Biochemistry and Physiology·John D HatleDavid W Borst
Jul 6, 2000·Insect Biochemistry and Molecular Biology·K G Davey
May 26, 2009·General and Comparative Endocrinology·G ManièreJ P Delbecque
Dec 17, 2008·General and Comparative Endocrinology·Heleen VerlindenJozef Vanden Broeck
Aug 26, 1998·General and Comparative Endocrinology·A De Loof, R Huybrechts
Mar 5, 2013·General and Comparative Endocrinology·Pieter Van WielendaeleJozef Vanden Broeck
Jun 22, 2001·Archives of Insect Biochemistry and Physiology·A De LoofJ Vanden Broeck
Nov 13, 2001·Proceedings. Biological Sciences·J Kathirithamby
Mar 27, 2007·Journal of Insect Physiology·Andrew D Peel, Michael Akam

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