Castration-induced nigrostriatal deficits are linked to reduced TrkB and loss of mature spines in the dorsal striatum - Summary - MDSpire

Castration-induced nigrostriatal deficits are linked to reduced TrkB and loss of mature spines in the dorsal striatum

  • By

  • Gerald J. Donahue

  • James A. Lundari

  • Patrick W. Kane

  • Samantha M. Matamorose-Patrick

  • Julia E. Klotz

  • Nicholas L. Carr

  • Stephen C. Kudriavetz

  • Joe C. Brague

  • June 3, 2026

  • 0 min

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Objective:

To determine how prepubertal gonadal hormone loss influences striatal circuitry and synaptic plasticity.

Key Findings:
  • Castration led to reduced tyrosine hydroxylase-positive neurons in the substantia nigra pars compacta.
  • Motor performance was impaired in castrated mice.
  • Androgen loss resulted in decreased mushroom spine density and increased immature spine classes in striatal neurons.
  • Testosterone replacement preserved dopaminergic neurons and normalized motor behavior.
  • Reduced striatal TrkB protein levels were observed following androgen deprivation.
Interpretation:

Limitations:
  • The study was conducted in a mouse model, which may not fully replicate human conditions.
  • Long-term effects of testosterone replacement were not assessed.
Conclusion:

Original Source(s)

Castration-induced nigrostriatal deficits are linked to reduced TrkB and loss of mature spines in the dorsal striatum

  • by Gerald J. Donahue, James A. Lundari, Patrick W. Kane, Samantha M. Matamorose-Patrick, Julia E. Klotz, Nicholas L. Carr, Stephen C. Kudriavetz, Joe C. Brague

  • June 3, 2026

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