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Related Experiment Video

Updated: Jan 7, 2026

Locomotor Assessment of 6-Hydroxydopamine-induced Adult Zebrafish-based Parkinson's Disease Model
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Developmental Dopamine Loss Rewires Striatal Circuits to Promote Locomotion.

Jie Dong1, Breanna T Sullivan1, Victor M Martinez Smith1

  • 1National Institutes of Health.

Research Square
|December 31, 2025
PubMed
Summary

Parkinson's disease (PD) research shows that losing specific dopamine neurons alters brain circuits. This study reveals a shift in spiny projection neurons that may explain abnormal movement in PD models.

Keywords:
ALDH1A1Kremen1Parkinson’s diseasePitx3direct-pathwaydopaminergic neuronsindirect-pathwayneuromodulationoptogeneticsstriatal projection neurons

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Parkinson's disease (PD) motor symptoms stem from nigrostriatal dopaminergic neuron (DAN) degeneration, especially Aldehyde Dehydrogenase 1A1-positive (ALDH1A1⁺) DANs.
  • Pitx3-deficient mice model this loss, showing hyperlocomotion despite reduced ALDH1A1⁺ DANs, indicating compensatory brain changes.
  • The dorsal striatum's spiny projection neurons (SPNs) include direct-pathway (dSPNs) and indirect-pathway (iSPNs) subtypes, with patch dSPNs inhibiting locomotion.

Purpose of the Study:

  • To investigate the impact of developmental Aldehyde Dehydrogenase 1A1-positive (ALDH1A1⁺) dopaminergic neuron (DAN) loss on spiny projection neuron (SPN) organization in Pitx3-deficient mice.
  • To determine how alterations in SPN subtypes and their projections contribute to the paradoxical hyperlocomotion observed in Pitx3-deficient mice.
  • To explore potential circuit-level adaptations in Parkinson's disease (PD) models.

Main Methods:

  • Utilized RNAscope in situ hybridization and SPN subtype-specific reporter mice to quantify dSPNs and iSPNs in Pitx3-deficient and control mice.
  • Employed three reporter lines (Kremen1, Nr4a1-GFP, Pdyn-IRES-Cre) to map patch SPN projections.
  • Performed optogenetic stimulation in freely moving mice to assess behavioral responses to activating patch dSPNs and iSPNs.

Main Results:

  • Pitx3-deficient mice showed no change in the overall dSPN:iSPN ratio but a significant decrease in the patch dSPN:patchy iSPN ratio (1.7 to 0.7).
  • Patch dSPN projections to the substantia nigra pars reticulata (SNr) were reduced, while patch iSPN projections to the globus pallidus externus (GPe) were enhanced.
  • Optogenetic stimulation suppressed locomotion in control mice but promoted it in Pitx3-deficient mice, indicating altered circuit function.

Conclusions:

  • Developmental loss of ALDH1A1⁺ DANs triggers a selective reorganization of patch SPNs, characterized by reduced patch dSPN and increased patch iSPN influence.
  • This SPN circuit shift may explain the paradoxical hyperlocomotion in Pitx3-deficient mice, offering insights into Parkinson's disease (PD) adaptations.
  • Findings highlight circuit-level adaptations with potential therapeutic relevance for PD treatment.