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Anabolic-androgenic steroids decrease dendritic spine density in the nucleus accumbens of male rats.

Kathryn Wallin-Miller1, Grace Li2, Diana Kelishani3

  • 1Neuroscience Graduate Program, University of Southern California, Los Angeles, CA 90033, USA.

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Summary

Anabolic-androgenic steroids (AAS) alter brain structure. Testosterone treatment decreased neuronal spine density in the nucleus accumbens, potentially explaining AAS-induced changes in decision-making behavior.

Keywords:
anabolic agentsdendritic spine densitymedium spiny neuronsnucleus accumbenstestosterone

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Behavioral Science

Background:

  • Anabolic-androgenic steroids (AAS) are known to affect cognitive functions like decision making.
  • The neural underpinnings of AAS-induced cognitive changes, particularly within the dopamine system, are not well understood.
  • The nucleus accumbens (Acb) plays a crucial role in reward, motivation, and cognitive processes.

Purpose of the Study:

  • To investigate the effects of chronic high-dose testosterone on neuronal morphology in the shell region of the nucleus accumbens (AcbSh).
  • To explore potential structural mechanisms for how AAS might alter decision-making and cognitive flexibility.

Main Methods:

  • Adolescent male rats received chronic treatment with high-dose testosterone or vehicle for 8 weeks.
  • Golgi-Cox staining was used to analyze neuronal morphology, specifically dendritic spine density, in AcbSh medium spiny neurons.
  • Sholl analysis was employed to assess dendritic length and arborization.

Main Results:

  • Eight weeks of testosterone treatment significantly decreased spine density in the AcbSh compared to vehicle-treated controls.
  • No significant effects of testosterone were observed on total spine number, dendritic length, or arborization.
  • These findings indicate that AAS alter neuronal structure in the AcbSh.

Conclusions:

  • Chronic high-dose testosterone administration reduces dendritic spine density in the AcbSh.
  • This morphological change in the AcbSh provides a potential neural mechanism for AAS-induced alterations in cognition and decision-making behavior.
  • Further research is needed to fully elucidate the complex relationship between AAS, brain plasticity, and behavior.