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Dopamine Release Suppression Dependent on an Increase of Intracellular Ca(2+) Contributed to Rotenone-induced

Yan Sai1, Junfeng Chen, Feng Ye

  • 1Institute of Toxicology, Third Military Medical University, Chongqing 400038, China.

Journal of Toxicologic Pathology
|August 6, 2013
PubMed

Insights

Rotenone impairs dopamine release in a Parkinson's disease model by disrupting intracellular calcium dynamics and affecting exocytosis. Blocking calcium channels with nifedipine mitigates these toxic effects in PC12 cells.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Pharmacology

Background:

  • Rotenone, a mitochondrial complex I inhibitor, induces a Parkinson's disease (PD) model characterized by dopamine release dysfunction.
  • Neuronal dopamine release involves exocytosis, a process critically dependent on intracellular calcium (Ca(2+)) dynamics.

Purpose of the Study:

  • To investigate the role of Ca(2+) in dopamine exocytosis and release in rotenone-treated PC12 cells.
  • To elucidate the mechanisms underlying rotenone-induced neurotoxicity in relation to dopamine release.

Main Methods:

  • PC12 cells were treated with rotenone to model PD.
  • Intracellular Ca(2+) levels, voltage-gated Ca(2+) channels, and SNARE protein expression (syntaxin, VAMP2, SNAP-25) were analyzed.
  • The effects of nifedipine, an L-type Ca(2+) channel blocker, on cell viability, neurite outgrowth, dopamine levels, and reactive oxygen species (ROS) formation were assessed.

Main Results:

  • Rotenone increased intracellular Ca(2+) via Ca(2+) influx through voltage-gated Ca(2+) channels.
  • Rotenone altered the expression of key SNARE proteins involved in exocytosis.
  • Nifedipine pretreatment reduced intracellular dopamine levels and ROS, improved cell viability, and enhanced neurite outgrowth and synaptic vesicle exocytosis.

Conclusions:

  • Intracellular Ca(2+) dysregulation is a key factor in rotenone-induced suppression of dopamine release in PC12 cells.
  • These findings highlight the link between rotenone neurotoxicity, altered Ca(2+) signaling, and impaired dopamine exocytosis.
Keywords:
Ca2+PC12 cellsdopamine releaseneurotoxicityrotenone

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