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Oxytocin and Dopamine Receptor Expression: Cellular Level Implications for Pair Bonding.

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Prairie voles show higher oxytocin receptor (Oxtr) cell counts than meadow voles, with Oxtr enriched in cells expressing both dopamine receptors (Drd1+/Drd2+). This reveals cellular differences underlying social behavior variation.

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Area of Science:

  • Neuroscience
  • Behavioral Genetics
  • Molecular Biology

Background:

  • Oxytocin (Oxtr) and dopamine (Drd1, Drd2) receptors influence behavioral variation across species.
  • Differences in nucleus accumbens (NAc) expression of these receptors are known between prairie and meadow voles.
  • The precise cellular organization of these receptor systems remains largely uncharacterized.

Purpose of the Study:

  • To map the cellular distribution of Oxtr, Drd1, and Drd2 in the NAc of prairie and meadow voles.
  • To investigate species- and pair-bonding-related differences in receptor expression patterns.
  • To comprehensively map Oxtr and dopamine receptor (Drd1-5) expression across NAc cell types in prairie voles.

Main Methods:

  • Multiplex in situ hybridization was used to visualize Oxtr, Drd1, and Drd2 expression.
  • Cellular counts and distribution were analyzed in sexually naïve and mate-paired voles.
  • Single-nucleus sequencing provided a molecular map of NAc cell types and receptor expression in prairie voles.

Main Results:

  • Prairie voles exhibited higher Oxtr+ cell counts compared to meadow voles.
  • Oxtr was enriched in cells co-expressing Drd1 and Drd2 (Drd1+/Drd2+) in prairie voles.
  • No significant species or pairing-induced differences were found in Drd1+ or Drd2+ cell counts.

Conclusions:

  • Oxytocin receptor expression is generally upregulated in prairie voles, particularly in cells co-expressing dopamine receptors.
  • Dopamine receptor cell counts are stable, suggesting expression level differences, not cell number changes, underlie prior findings.
  • This study provides a foundational cellular and molecular framework for understanding how oxytocin and dopamine systems shape social behavior in the NAc.