6533b82efe1ef96bd1293d80
RESEARCH PRODUCT
Central Modulatory Neurons Control Fuel Selection in Flight Muscle of Migratory Locust
Heike StypaCarsten DuchTim MentelHans-joachim PflügerGerhard WegenerUli Müllersubject
Central Nervous SystemMalemedicine.medical_specialtyGrasshoppersBrief CommunicationInsect flightCarbohydrate catabolismInternal medicinemedicineFructosediphosphatesPremovement neuronal activityAnimalsGlycolysisProtein kinase AMuscle SkeletalOctopamineNeuronsbiologyGeneral NeuroscienceMigratory locustbiology.organism_classificationCyclic AMP-Dependent Protein KinasesEndocrinologyFlight AnimalOctopamine (neurotransmitter)FemaleGlycolysisLocustSignal Transductiondescription
Insect flight is one of the most intense and energy-demanding physiological activities. High carbohydrate oxidation rates are necessary for take-off, but, to spare the limited carbohydrate reserves, long-distance flyers, such as locusts, soon switch to lipid as the main fuel. We demonstrate that before a flight, locust muscles are metabolically poised for take-off by the release of octopamine from central modulatory dorsal unpaired median (DUM) neurons, which increases the levels of the potent glycolytic activator fructose 2,6-bisphosphate in flight muscle. Because DUM neurons innervating the flight muscles are active during rest but selectively inhibited during flight, they stimulate carbohydrate catabolism during take-off but tend to decrease muscle glycolysis during prolonged flight. cAMP-dependent protein kinase A is necessary but not sufficient for signal transduction, suggesting parallel control via a calcium-dependent pathway. Locust flight is the first reported instance of a direct and specific involvement of neuronal activity in the control of muscle glycolysis in working muscle during exercise.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-02-15 |