Journal of Comparative Physiology B

, Volume 161, Issue 2, pp 125–131 | Cite as

Changes in lipid and carbohydrate metabolism during starvation in adult Manduca sexta

  • Rolf Ziegler
Article

Summary

Adult Manduca sexta feed very irregularly in the laboratory, and many adult males never feed. Feeding adults live longer and feeding females lay many more eggs; however, in both feeding (sugar water) and starving adults a decrease of metabolic reserves is observed. Carbohydrates disappear from hemolymph and from fat body. Fat body lipid also decreases, while hemolymph lipid concentration increases strongly in starving adults. The activity of fat body glycogen phosphorylase increases strongly in starving adult M. sexta. The activity of glycogen phosphorylase is correlated inversely with hemolymph sugar concentration. Injected trehalose inactivates glycogen phosphorylase within 2 h, and lowers the hemolymph lipid level within 6 h. In starving adult M. sexta, neither the activation of glycogen phosphorylase nor the increase of hemolymph lipid concentration depends on adipokinetic hormone, since cardiacectomy does not prevent the activation of glycogen phosphorylase nor the increase of hemolymph lipid level.

Key words

Starvation in Manduca sexta Level and amount of lipid Decrease of carbohydrate Cardiacectomy Glycogen phosphorylase activation 

Abbreviations

AKH

adipokinetic hormone

EDTA

ethylenediamine tetraacetate

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • Rolf Ziegler
    • 1
  1. 1.Institut für Tierphysiologie der Freien Universität BerlinBerlin 33Federal Republic of Germany

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