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Related Experiment Video

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Straightforward Assay for Quantification of Social Avoidance in Drosophila melanogaster
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Learned avoidance requires VTA KOR-mediated reductions in dopamine.

Mykel A Robble1, Mary E Bozsik1, Daniel S Wheeler1

  • 1Dept. Biomedical Sciences, Marquette University, 561 N. 15th St SC 446, Milwaukee, WI, 53233, USA.

Neuropharmacology
|February 15, 2020
PubMed
Summary
This summary is machine-generated.

Blocking kappa opioid receptors (KORs) in the ventral tegmental area (VTA) prevents avoidance learning by maintaining dopamine signaling after aversive experiences. This highlights KORs

Keywords:
AvoidanceDopamineKappa opioid receptorLearning

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Neuropharmacology

Background:

  • Learning from aversive experiences is crucial for survival but is impaired in mental disorders and dopaminergic neurodegenerative diseases.
  • The mesolimbic dopamine system is vital for reward learning, yet dopamine signaling patterns guiding avoidance are not well understood.
  • The dynorphin/kappa opioid receptor (KOR) system may modulate dopamine signaling in response to aversive stimuli, as KOR activation is aversive.

Purpose of the Study:

  • To investigate the necessity of ventral tegmental area (VTA) KOR activity in regulating dopamine signaling and avoidance learning.
  • To determine if aversion-induced reductions in striatal dopamine are essential for avoidance behavior.

Main Methods:

  • Tested the effects of VTA KOR blockade on real-time dopaminergic responses to aversive stimuli in male Sprague-Dawley rats.
  • Assessed learned avoidance behavior following VTA KOR blockade after an aversive experience.
  • Administered an intra-nucleus accumbens D2 receptor agonist to test its effect on avoidance behavior.

Main Results:

  • Blockade of VTA KORs attenuated aversion-induced reductions in dopamine signaling.
  • VTA KOR blockade prevented the development of learned avoidance following an aversive experience.
  • Treatment with an intra-nucleus accumbens D2 receptor agonist also prevented avoidance behavior.

Conclusions:

  • Ventral tegmental area KORs play a critical role in mediating aversion-induced reductions in dopamine signaling.
  • These dopamine reductions are necessary for the formation of learned avoidance behaviors.
  • Aversion-induced dopamine decreases may disinhibit aversion-sensitive striatal output pathways, promoting avoidance.