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Cognitive Test Solution in Mice with Different Brain Weights after Atomoxetine.

Olga V Perepelkina1, Inga I Poletaeva1

  • 1Biology Department, Lomonossov Moscow State University, Vorobievy Gory, 1, Building 12, Moscow 119234, Russia.

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Atomoxetine impacts cognitive task performance and reduces immobility in mice. Brain size influences task success, suggesting strain-specific noradrenergic system differences.

Keywords:
atomoxetineaversive behaviorbrain weight differencescognitive taskmouse strainsnoradrenergic ascending projections

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Animal Behavior

Background:

  • Atomoxetine is a selective norepinephrine reuptake inhibitor.
  • Mouse strain differences in brain weight may influence drug responses.
  • Noradrenergic pathways are crucial for cognitive function and stress responses.

Purpose of the Study:

  • To investigate the behavioral effects of daily atomoxetine administration in two mouse strains with differing relative brain weights.
  • To explore potential strain-specific differences in responses to atomoxetine.
  • To examine the impact of atomoxetine on cognitive performance and behavioral despair.

Main Methods:

  • Two mouse strains with distinct relative brain weights were administered seven daily injections of atomoxetine.
  • Performance was assessed using a puzzle-box cognitive test.
  • Behavioral despair was evaluated in an aversive slippery funnel test (analogous to the Porsolt test).

Main Results:

  • Atomoxetine differentially affected cognitive task performance based on mouse strain and brain size.
  • Mice with larger brains were less successful in the cognitive test, potentially due to reduced fear.
  • Atomoxetine-treated mice exhibited increased activity in the aversive test, with significantly decreased immobility time.
  • Interstrain differences in behavioral reactions suggest variations in ascending noradrenergic projections.

Conclusions:

  • Atomoxetine's effects on behavior are complex and influenced by relative brain weight.
  • The observed behavioral differences suggest underlying disparities in the noradrenergic system between the mouse strains.
  • Further research into the noradrenergic system and related drug effects in these strains is warranted.