pyruvate marqué au c14; vers à soie; radioactivité
Abstract :
[en] 1. When injected into silkworms in the middle of the fifth larval instar, labelled G-1-P is principally used for the synthesis of hemolymph trehalose. 2. Glycogen synthesis from the same source in the fat body proceeds more rapidly in undernourished larvae than in those fed normally. 3. Owing to the poor incorporation of the radioactivity in the glycogen and especially in the trehalose of the fat body, it is suggested that the trehalose could be synthesized from pyruvate elsewhere than in the fat body, and that the biosynthetic pathway of trehalose from pyruvate does not necessarily pass through glycogen. 4. The synthesis of trehalose and glycogen, as well as the hydrolysis of glycogen, could be controlled, directly or indirectly, by the variations of the trehalose level in the hemolymph. 5. The gluconeogenetic pathways in the silkworm are discussed and presented in the form of a partially hypothetical figure. [fr] Le G-1P marqué, injecté à des Vers à soie au milieu du 5e âge larvaire, est principalement utilisé pour la synthèse du tréhalose de l'hémolymphe. La synthèse de glycogène au sein du tissu adipeux est beaucoup moins rapide chez les chenilles sous-alimentées que chez les chenilles normalement nourries. La faible incorporation de radioactivité dans le glycogène et surtout dans le tréhalose du tissu adipeux suggère que le tréhalose peut être synthétisé ailleurs que dans le tissu adipeux et que la voie biosynthétique du tréhalose à partir du pyruvate ne passe pas nécessairement par le glycogène. Les vitesses relatives de synthèse du glycogène et du tréhalose, de même que la dégradation du glycogène pourraient être contrôlées, directement ou indirectement, par les variations du niveau de la tréhalosémie. Les voies de la gluconéogenèse chez le Ver à soie sont résumées en un schéma partiellement hypothétique.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Bricteux-Grégoire, S.; Université de Liège - ULiège > Institut L. Fredericq > Biochimie
Jeuniaux, Charles ; Université de Liège - ULiège > Institut L. Fredericq > Biochimie
Florkin, Marcel ; Université de Liège - ULiège > Institut L. Fredericq > Biochimie
Language :
French
Title :
Contributions à la biochimie du ver à soie. XXX. Biosynthèse de tréhalose et de glycogène à partir de glucose-1-phosphate
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