Castration-induced nigrostriatal deficits are linked to reduced TrkB and loss of mature spines in the dorsal striatum - Report - 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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Castration-related deficits in the nigrostriatal pathway are associated with decreased TrkB levels

Overview

This study investigates the impact of peripubertal androgen deprivation on nigrostriatal integrity and motor behavior in male mice, revealing deficits in dopamine neuron survival and synaptic architecture.

Background

Parkinson's disease (PD) is a neurodegenerative disorder with a higher prevalence in men. The nigrostriatal pathway is crucial for motor control, and alterations in this pathway can lead to significant motor dysfunction.

Data Highlights

No numerical data or trial data provided in the source material.

Key Findings

['Androgen deprivation during a critical developmental window leads to reduced tyrosine hydroxylase-positive neurons in the substantia nigra.', 'Motor performance was impaired in castrated male mice, evidenced by deficits on the vertical pole and rotarod tests.', 'Loss of androgens resulted in decreased mushroom spine density and increased immature spine classes in striatal neurons.', 'Testosterone replacement therapy preserved dopaminergic neurons and normalized motor behavior.', 'Reduced TrkB protein levels were associated with impaired BDNF signaling and synaptic maturation.']

Clinical Implications

These findings suggest that early androgen loss may contribute to the pathophysiology of Parkinson's disease by destabilizing striatal synaptic architecture. Clinicians should consider the potential impact of hormonal status on motor function and neuronal health in male patients.

Conclusion

The study highlights the importance of androgen signaling in maintaining nigrostriatal integrity and suggests that early hormonal disruptions may have lasting effects on neurodegenerative processes in Parkinson's disease.

Related Resources & Content

  1. Khasnavis et al., Acta Neuropathologica, 2023 -- Castration-related deficits in the nigrostriatal pathway
  2. Acta Neuropathologica — Investigating Dendritic Spine Abnormalities in Alzheimer’s Disease: Challenges and Prospects
  3. Brain — Modulating inhibitory synaptic plasticity to restore basal ganglia dynamics in Parkinson's disease
  4. Acta Neuropathologica — Both reduced and excessive glutathione levels trigger degeneration of dopaminergic neurons in the substantia nigra
  5. Parkinson’s disease in adults
  6. Sex differences in the severity of non-motor symptoms in Parkinson’s disease: a systematic review and meta-analysis
  7. Risk of Alzheimer’s disease and Parkinson’s disease following androgen deprivation therapy in a real world nationwide cohort | Scientific Reports

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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