Related Experiment Video
Updated: Oct 26, 2025
07:12
Circadian Entrainment of Drosophila Melanogaster
Published on: June 3, 2020
4.5K
Endocrine signals fine-tune daily activity patterns in Drosophila
Dennis Pauls1, Mareike Selcho1, Johanna Räderscheidt2
1Neurobiology and Genetics, Theodor-Boveri-Institute, Biocenter, University of Würzburg, Am Hubland, 97074 Würzburg, Germany; Department of Animal Physiology, Institute of Biology, Leipzig University, Talstraße 33, 04103 Leipzig, Germany.
Current Biology : CB
|July 30, 2021
Summary
Drosophila adipokinetic hormone (AKH) balances daily activity by signaling through two pathways: one boosts daytime activity via octopaminergic neurons, and another limits nighttime activity by acting on the fat body.
Area of Science:
- Neuroendocrinology
- Animal Behavior
- Metabolic Regulation
Background:
- Maintaining internal homeostasis requires balancing competing behaviors, often mediated by complex neuroendocrine signaling.
- The adipokinetic hormone (AKH) system is known to regulate energy mobilization and starvation-induced hyperactivity.
Purpose of the Study:
- To investigate whether the AKH neuroendocrine axis regulates activity levels in Drosophila, even when food is freely available.
- To elucidate the divergent signaling pathways of AKH in controlling daily activity patterns.
Main Methods:
- Systematic manipulation of signaling between AKH-producing cells, octopaminergic neurons, and the fat body in Drosophila.
- Assessment of activity levels under ad libitum feeding conditions.
Main Results:
- Adipokinetic hormone (AKH) utilizes two distinct, competitive pathways to regulate activity and rest.
- AKH promotes daytime activity by signaling through the octopaminergic system.
- AKH suppresses high activity during the night by signaling to the fat body, involving feedback to AKH-producing cells.
Conclusions:
- The AKH system plays a crucial role in shaping daily activity patterns in Drosophila under normal feeding conditions.
- AKH-producing cells integrate metabolic signals to modulate circadian activity rhythms.
- This study reveals a novel function of AKH in balancing activity and rest through divergent pathways.
