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Related Experiment Videos

Sensorimotor gating and dopamine function in postpartum rats.

Elizabeth M Byrnes1, Robert S Bridges, Victoria F Scanlan

  • 1Department of Biomedical Sciences, Tufts University Cummings School of Veterinary Medicine, North Grafton, MA 01536, USA. elizabeth.byrnes@tufts.edu

Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology
|October 19, 2006
PubMed
Summary

Postpartum rats show impaired sensorimotor gating due to altered dopamine systems. This reduced function, observed on postpartum days 2 and 14, may be linked to hormonal changes after pregnancy.

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Area of Science:

  • Neuroscience
  • Reproductive Biology
  • Endocrinology

Background:

  • Estrogen withdrawal post-pregnancy effects on brain dopamine are poorly understood.
  • Limited research exists on postpartum changes in forebrain dopamine systems.

Purpose of the Study:

  • To investigate alterations in forebrain dopamine function in postpartum rats.
  • To examine changes in sensorimotor gating and dopamine receptor sensitivity.

Main Methods:

  • Measured prepulse inhibition of the acoustic startle response (PPI) in postpartum and control rats.
  • Administered dopamine D2 agonist (quinpirole) to assess receptor sensitivity.
  • Analyzed dopamine levels, turnover, cAMP accumulation, and hormone concentrations.

Main Results:

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  • Postpartum rats exhibited significantly disrupted PPI, linked to reduced nucleus accumbens cAMP.
  • Reduced sensitivity to quinpirole was observed in postpartum animals for PPI and corticosterone response.
  • Increased startle amplitude in postpartum rats was attenuated by quinpirole.

Conclusions:

  • The postpartum period is characterized by impaired sensorimotor gating and altered dopamine system function.
  • These neurobiological changes may be associated with significant shifts in circulating hormones.