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Intermediary metabolism in mudskippers, Periophthalmodon schlosseri and Boleophthalmus boddarti, during immersion or emersion

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Abstract:

This study aimed to examine effects of 48h emersion on intermediary metabolism in the mudskippers Periophthalmodon schlosseri (Pallas, 1770) and Boleophthalmus boddarti (Pallas, 1770). The glycogen content increased significantly, while the lactate content remained unchanged, in the muscle of P. schlosseri during 48h of emersion. Thus, emersion led to either a decrease in glycogen utilization or an increase in glycogen synthesis. Because there was no change in energy charge, P. schlosseri probably used energy stores other than glycogen during emersion. The phosphofructose kinase-1 (PFK) from the muscle of P. schlosseri became more sensitive to ATP inhibition after 6h of emersion, indicating that a transient decrease in the glycolytic flux indeed occurred at this locus that led to an increase in glycogen content. In contrast, such phenomena were not observed in the muscle of B. boddarti during 48h of emersion. Emersion also led to a significant increase in the muscle fructose-2,6-bisphosphate (F26P2) content in P. schlosseri, but not in B. boddarti. Based on results obtained from P. schlosseri undergoing forced exercise, we propose that a correlation may exist between the F26P2 content and the utilization of amino acids as an energy source in this mudskipper during emersion.

Notre étude cherche à déterminer les effets d’un émersion de 48 h sur le métabolisme intermédiaire des poissons amphibies Periophthalmodon schlosseri (Pallas, 1770) et Boleophthalmus boddarti (Pallas, 1770). Durant une émersion de 48 h, le contenu en glycogène augmente significativement dans le muscle de P.schlosseri, alors que le contenu en lactate reste inchangé. L’émersion mène donc ou bien à une réduction de l’utilisation du glycogène ou alors à une augmentation de la synthèse du glycogène. Parce qu’il n’y a pas de changement dans la charge énergétique, P.schlosseri utilise probablement des réserves énergétiques autres que le glycogène durant l’émersion. Après 6 h d’émersion, la phosphofructokinase-1 (PFK) du muscle de P.schlosseri devient plus sensible à l’inhibition de l’ATP, ce qui indique qu’il se produit en effet une réduction transitoire du flux glycolytique à ce locus, qui explique l’augmentation du contenu en glycogène. En revanche, ces phénomènes ne s’observent pas dans le muscle de B.boddarti durant une émersion de 48 h. L’émersion entraîne aussi une augmentation significative du contenu de fructose-2,6-biphosphate (F26P2) dans le muscle de P.schlosseri, mais pas dans celui de B.boddarti. D’après les résultats obtenus chez P.schlosseri durant un exercice forcé, nous croyons qu’il existe peut-être une corrélation entre le contenu en F26P2 et l’utilisation des acides aminés comme source d’énergie chez ce poisson amphibie durant l’émersion.

Document Type: Research Article

Publication date: July 1, 2006

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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