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Nucleus accumbens core and pathogenesis of compulsive checking.

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Psychopharmacology

Background:

  • Compulsive checking behaviors, often seen in obsessive-compulsive disorder, can be modeled in rodents using drugs like quinpirole.
  • The nucleus accumbens core (NAc) is a key brain region involved in motivation and reward, but its specific role in compulsive behaviors is not fully understood.

Purpose of the Study:

  • To investigate the role of the nucleus accumbens core (NAc) in the development of quinpirole-induced compulsive checking behavior in rats.
  • To determine if the NAc is essential for the manifestation of quinpirole's compulsive effects or if it modulates their development.

Main Methods:

  • Rats underwent excitotoxic lesions of the NAc or sham procedures.
  • Following surgery, rats were injected with quinpirole (a dopamine D2/D3 receptor agonist) or saline.
  • Compulsive checking behavior was monitored over 10 biweekly tests.

Main Results:

  • Quinpirole induced compulsive checking even after NAc lesions, suggesting the primary site of action is outside the NAc.
  • NAc lesions did not prevent compulsive checking but significantly altered the speed of its development.
  • Hyperactivity in saline-treated rats with NAc lesions did not lead to compulsive checking, decoupling hyperactivity from the compulsive phenotype.

Conclusions:

  • The pathogenic effects of quinpirole leading to compulsive checking are not solely dependent on the NAc.
  • The NAc appears to play a modulatory role in the *induction* and *speed* of compulsive checking development.
  • Compulsive checking may represent an overactive security motivation system, with the NAc acting as a coordinating hub.