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MPTP-meditated hippocampal dopamine deprivation modulates synaptic transmission and activity-dependent synaptic

GuoQi Zhu1, Ying Chen, YuYing Huang

  • 1Institutes of Brain Science, Fudan University, 138 Yi Xue Yuan Road, Shanghai 200032, PR China.

Toxicology and Applied Pharmacology
|May 25, 2011
PubMed

Insights

MPTP exposure causes Parkinson's disease-like symptoms by reducing dopamine neurons and impairing hippocampal synaptic plasticity, affecting memory processing and NMDA receptor function.

Area of Science:

  • Neuroscience
  • Neuropharmacology
  • Synaptic Plasticity

Background:

  • 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) induces Parkinson's disease (PD)-like symptoms, including learning deficits.
  • MPTP's potential to disrupt hippocampal memory processing via dopamine (DA) and activity-dependent synaptic plasticity is investigated.

Purpose of the Study:

  • To investigate the impact of MPTP-induced DA depletion on hippocampal synaptic plasticity and NMDA receptor function.
  • To elucidate the mechanisms underlying MPTP's effects on learning and memory.

Main Methods:

  • MPTP was administered intraperitoneally (i.p.) to induce PD-like symptoms in a rodent model.
  • Tyrosine hydroxylase (TH) expression, DA levels, and synaptic plasticity (LTP/LTD) in the hippocampus were assessed.
  • NMDA receptor-mediated synaptic transmission was evaluated using field excitatory postsynaptic potentials (fEPSPs).

Main Results:

  • MPTP injection reduced TH-positive neurons in the substantia nigra (SN) and decreased DA levels in the striatum and hippocampus.
  • Long-term potentiation (LTP) induction was impaired, while long-term depression (LTD) duration was prolonged.
  • NMDA receptor-mediated fEPSPs decreased by approximately 23%, suggesting altered synaptic transmission.

Conclusions:

  • MPTP-induced DA neuron degeneration and subsequent hippocampal DA depletion significantly alter NMDA receptor-mediated synaptic transmission.
  • These alterations in synaptic plasticity contribute to the cognitive deficits observed in MPTP-treated subjects, highlighting a critical role for dopamine in hippocampal function.

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