Logo du site
  • English
  • Français
  • Se connecter
Logo du site
  • English
  • Français
  • Se connecter
  1. Accueil
  2. Université de Neuchâtel
  3. Publications
  4. Metabolism of ecdysteroids during the vitellogenesis of the tick <i>Ornithodoros moubata</i> (Ixodoidea, Argasidae): Accumulation of apolar metabolites in the eggs
 
  • Details
Options
Vignette d'image

Metabolism of ecdysteroids during the vitellogenesis of the tick <i>Ornithodoros moubata</i> (Ixodoidea, Argasidae): Accumulation of apolar metabolites in the eggs

Auteur(s)
Connat, Jean-Louis
Diehl, Peter-Allan 
Institut de biologie 
Morici, M
Date de parution
1984
In
General and Comparative Endocrinology, Elsevier, 1984/56/1/100-110
Résumé
The fate of injected [<sup>3</sup>H]ecdysone ([<sup>3</sup>H]E) and 20-hydroxy-[<sup>3</sup>H]ecdysone ([<sup>3</sup>H]20E) has been investigated in the female tick <i>Ornithodoros moubata</i> (Murray, 1877; sensu Walton, 1962). When injected into fed mated vitellogenic females, [<sup>3</sup>H]E is converted into [<sup>3</sup>H]20E and two apolar classes of metabolites, AP1 and AP2. Injected [<sup>3</sup>H]20E is directly converted into AP1 and AP2. AP2 is incorporated into the ovaries in a high proportion and at the end of the vitellogenic cycle represents about 25% of the total label recovered from the animal. The fate of labeled hormones injected into virgin females which perform an abortive vitellogenic cycle is quite similar. However, the ovaries incorporated less of the AP2 products. Ovaries of mated females cultured <i>in vitro</i> in the presence of [<sup>3</sup>H]E are able to produce [<sup>3</sup>H]20E and AP2. AP2 is incorporated, while [<sup>3</sup>H]20E is mainly found in the medium. Ovaries of virgin females presented a slower rate of transformation and of incorporation of the label. Labeled AP2 is recovered in freshly laid eggs and AP1 in the females after oviposition. AP1 and AP2 can produce [<sup>3</sup>H]20E, [<sup>3</sup>H]E, and other minor polar peaks when submitted to hydrolysis by esterase. It is concluded that the female <i>O. moubata</i> possesses a special enzymatic mechanism for transformation of ecdysteroids into apolar products and for selective incorporation of AP2 into the ovaries. These products are present in the freshly laid eggs and could play a role during embryogenesis.
Identifiants
https://libra.unine.ch/handle/123456789/16415
_
10.1016/0016-6480(84)90066-2
Type de publication
journal article
Dossier(s) à télécharger
 main article: Connat_J.-L._-_Metabolism_of_Ecdysteroids_during_the_Vitellogenesis_20080718.pdf (2.43 MB)
google-scholar
Présentation du portailGuide d'utilisationStratégie Open AccessDirective Open Access La recherche à l'UniNE Open Access ORCIDNouveautés

Service information scientifique & bibliothèques
Rue Emile-Argand 11
2000 Neuchâtel
contact.libra@unine.ch

Propulsé par DSpace, DSpace-CRIS & 4Science | v2022.02.00