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Primary Culture of Mouse Dopaminergic Neurons
11:58

Primary Culture of Mouse Dopaminergic Neurons

Published on: September 8, 2014

Two waves of cyclin B and proliferating cell nuclear antigen expression during dopamine-triggered neuronal apoptosis

A Shirvan1, I Ziv, T Machlin

  • 1Department of Neurology and Felsenstein Medical Research Center, Rabin Medical Center, Petah Tiqva, Israel.

Journal of Neurochemistry
|August 1, 1997
PubMed

Insights

Dopamine triggers neuronal apoptosis by activating cell cycle genes inappropriately. This incomplete cell cycle activation in postmitotic neurons during dopamine-induced cell death is a key finding.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Dopamine and its oxidative metabolites can induce apoptosis in postmitotic sympathetic neurons.
  • Understanding the early gene expression changes during this process is crucial for elucidating neuronal cell death mechanisms.

Purpose of the Study:

  • To identify genes transcriptionally regulated during the early stages of dopamine-induced apoptosis in sympathetic neurons.
  • To investigate the role of cell cycle components in this apoptotic pathway.

Main Methods:

  • Differential display method applied to cultured sympathetic neurons undergoing dopamine-induced apoptosis.
  • Analysis of mRNA and protein levels for specific genes, including cyclins and proliferating cell nuclear antigen.
  • Monitoring of DNA synthesis and cell-cycle stage-specific gene expression.

Main Results:

  • Cyclin B2 mRNA and protein showed two waves of induction and destruction, mimicking mitotic oscillations.
  • Other cell-cycle genes, proliferating cell nuclear antigen, and cyclin A exhibited altered expression patterns.
  • Key cell cycle regulators like cyclin D1 and cyclin-dependent kinases were undetected, and DNA synthesis was absent, indicating incomplete cell cycle activation.
  • The temporal expression of these cell cycle mediators was unsynchronized compared to a normal cell cycle.

Conclusions:

  • Dopamine-triggered neuronal apoptosis involves inappropriate and incomplete activation of cell cycle-related genes in postmitotic neurons.
  • The observed cell cycle changes are unsynchronized and occur in distinct waves, with the second wave coinciding with cell death commitment.
  • These findings highlight a novel mechanism of neuronal cell death involving aberrant cell cycle re-entry.

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