Hymenoptera flight muscle mitochondrial function: Increasing metabolic power increases oxidative stress
| Autor: | Christopher P. Hedges, Jules B. L. Devaux, Anthony J. R. Hickey, Reuben T. Wilkinson |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Physiology Zoology Glycerolphosphate Dehydrogenase Oxidative phosphorylation medicine.disease_cause Biochemistry Insect flight Oxidative Phosphorylation 03 medical and health sciences 0302 clinical medicine Species Specificity medicine Animals Wing loading Molecular Biology Bumblebee Wing biology Chemistry Feeding Behavior biology.organism_classification Hymenoptera Mitochondria Muscle Oxidative Stress 030104 developmental biology Bombus terrestris Flight Animal Vespula germanica Reactive Oxygen Species 030217 neurology & neurosurgery Oxidative stress |
| Zdroj: | Comparative biochemistry and physiology. Part A, Molecularintegrative physiology. 230 |
| ISSN: | 1531-4332 |
| Popis: | Insect flight is a high intensity activity, but biomechanical and metabolic requirements may vary depending on life style and feeding mode. For example, bees generally feed on pollen and nectar, whereas wasps also actively hunt and scavenge heavy prey. These variations in metabolic demands may result in different capacities of metabolic pathways in flight muscle, and utilisation some of these pathways may come at a cost of increased free radical production. To examine how metabolic requirements and oxidative stress vary between species, we explored the variation in flight mechanics and metabolism of the honeybee (Apis mellifera), bumblebee (Bombus terrestris), and German wasp (Vespula germanica). Wing structures and flight muscle properties were compared alongside measures of oxygen flux and reactive oxygen species (ROS) production from permeabilised flight muscle. The wasp wing structure is best adapted for carrying heavy loads, with the highest wing aspect ratio, lowest wing loading, and highest flight muscle ratio. Bumblebees had the lowest wing aspect ratio and flight muscle ratio, and highest wing loading. Although wasps also had the highest rates of oxygen consumption during oxidative phosphorylation, oxygen consumption did not increase in the wasp muscle following chemical uncoupling, while it did for the two bee species. While mitochondrial glycerol 3-phosphate dehydrogenase (mGPDH) mediated oxygen flux was greatest in wasps, muscle fibres released greater amounts of ROS through this pathway. Overall, the wasp has maximised lifting capacities through varying wing and flight muscle mass and by maximising OXPHOS capacities, and this accompanies elevated ROS production. |
| Databáze: | OpenAIRE |
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