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Reduced calcium/calmodulin-dependent protein kinase II activity in the hippocampus is associated with impaired

Shigeki Moriguchi1, Yasushi Yabuki, Kohji Fukunaga

  • 1Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan. shigeki@m.tohoku.ac.jp

Journal of Neurochemistry
|December 6, 2011
PubMed

Insights

MPTP-induced Parkinson

Area of Science:

  • Neuroscience
  • Neurobiology
  • Biochemistry

Background:

  • Parkinson's disease (PD) is characterized by cognitive deficits.
  • MPTP neurodegeneration in mice models PD-like behaviors and basal ganglia injury.
  • Early cognitive dysfunction in PD patients suggests a need to understand underlying mechanisms.

Purpose of the Study:

  • To investigate the association between MPTP-induced cognitive deficits and neurobiological changes.
  • To explore the role of calcium/calmodulin-dependent protein kinase II (CaMKII) and long-term potentiation (LTP) in MPTP-treated mice.
  • To determine the impact of MPTP on motor coordination and cognitive functions.

Main Methods:

  • Mice were administered MPTP (25mg/kg i.p.) daily for 5 days.
  • Motor coordination was assessed using rota-rod and beam-walking tasks.
  • Cognitive functions were evaluated via novel object recognition, passive avoidance, and Y-maze tasks.
  • Immunoblotting analyzed tyrosine hydroxylase, CaMKII autophosphorylation, and GluR1 phosphorylation.
  • Long-term potentiation (LTP) was measured in the hippocampal CA1 region.

Main Results:

  • MPTP treatment led to impaired motor coordination 1-2 weeks post-injection.
  • Cognitive deficits, including impaired novel object recognition and passive avoidance, emerged 3-4 weeks after MPTP administration.
  • Reduced CaMKII autophosphorylation and impaired LTP induction were observed in the hippocampal CA1 region.
  • Decreased CaMKII activity correlated with reduced AMPA-type glutamate receptor subunit 1 (GluR1) phosphorylation.

Conclusions:

  • MPTP-induced neurodegeneration in mice recapitulates motor and cognitive impairments seen in Parkinson's disease.
  • Reduced CaMKII activity and impaired hippocampal LTP induction are linked to cognitive deficits in MPTP-treated mice.
  • These molecular changes in CaMKII and GluR1 phosphorylation may underlie the observed learning disabilities in PD models.

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