Selection of motor programs for suppressing food intake and inducing locomotion in the Drosophila brain

PLoS Biol. 2014 Jun 24;12(6):e1001893. doi: 10.1371/journal.pbio.1001893. eCollection 2014 Jun.

Abstract

Central mechanisms by which specific motor programs are selected to achieve meaningful behaviors are not well understood. Using electrophysiological recordings from pharyngeal nerves upon central activation of neurotransmitter-expressing cells, we show that distinct neuronal ensembles can regulate different feeding motor programs. In behavioral and electrophysiological experiments, activation of 20 neurons in the brain expressing the neuropeptide hugin, a homolog of mammalian neuromedin U, simultaneously suppressed the motor program for food intake while inducing the motor program for locomotion. Decreasing hugin neuropeptide levels in the neurons by RNAi prevented this action. Reducing the level of hugin neuronal activity alone did not have any effect on feeding or locomotion motor programs. Furthermore, use of promoter-specific constructs that labeled subsets of hugin neurons demonstrated that initiation of locomotion can be separated from modulation of its motor pattern. These results provide insights into a neural mechanism of how opposing motor programs can be selected in order to coordinate feeding and locomotive behaviors.

Publication types

  • Research Support, Non-U.S. Gov't
  • Comment

MeSH terms

  • Animals
  • Central Nervous System / physiology*
  • Feeding Behavior / physiology*
  • Locomotion / physiology*

Grants and funding

Financial support from DFG (Deutsche Forschungsgemeinschaft) grant PA787, DFG Sonderforschungsbereich SFB645 and SFB704, LIMES (Life and Medical Sciences) graduate school of Nordrhein-Westfalia (NRW), and DFG Cluster of Excellence ImmunoSensation. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.