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Locomotor hyperactivity in 14-3-3ζ KO mice is associated with dopamine transporter dysfunction.

H Ramshaw1, X Xu, E J Jaehne

  • 1Centre for Cancer Biology, SA Pathology, Adelaide, South Australia, Australia.

Translational Psychiatry
|December 5, 2013
PubMed
Summary

14-3-3ζ protein deficiency leads to dopamine transporter (DAT) reduction, impacting dopamine signaling. This finding supports the hyperdopamine hypothesis in schizophrenia and related disorders.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Psychiatry

Background:

  • Dopamine (DA) neurotransmission is critical for brain function and linked to neuropsychiatric disorders.
  • Aberrant dopamine signaling, particularly hyperactivation, is implicated in schizophrenia.
  • 14-3-3ζ was identified as a risk factor in schizophrenia networks and crucial for neurodevelopment.

Purpose of the Study:

  • To investigate the role of 14-3-3ζ in dopamine signaling and its potential link to schizophrenia.
  • To elucidate the molecular mechanisms underlying 14-3-3ζ's function in dopaminergic neurotransmission.

Main Methods:

  • Analysis of 14-3-3ζ knockout (KO) mice.
  • Behavioral assessments (locomotor activity).
  • Biochemical assays measuring dopamine levels, tyrosine hydroxylase (TH), dopamine receptors, and dopamine transporter (DAT) levels.
  • Co-immunoprecipitation to assess protein interactions.

Main Results:

  • 14-3-3ζ KO mice exhibited hyperactivity, which was reversed by clozapine.
  • Amphetamine-induced hyperactivity was enhanced in 14-3-3ζ KO mice.
  • Reduced dopamine transporter (DAT) levels were observed in 14-3-3ζ KO mice, without changes in TH or dopamine receptors.
  • A physical association between 14-3-3ζ and DAT was identified.

Conclusions:

  • 14-3-3ζ plays a novel role in regulating dopamine neurotransmission, specifically by controlling DAT stability.
  • The findings support the hyperdopaminergic hypothesis in schizophrenia and related disorders.
  • 14-3-3ζ represents a potential therapeutic target for neuropsychiatric conditions.