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Updated: Jun 24, 2026
Primary Culture of Mouse Dopaminergic Neurons
Published on: September 8, 2014
Genotoxicity of the neurotransmitter dopamine in vitro
Helga Stopper1, Nicole Schupp, Gholamreza Fazeli
1Department of Toxicology, University of Wuerzburg, Versbacher Strasse 9, D-97078 Wuerzburg, Germany. stopper@toxi.uni-wuerzburg.de
Abstract:
Alterations in dopamine levels play a role in several human pathological conditions and their pharmacological treatment. Here we describe an induction of genomic damage detected as micronucleus formation by concentrations in the low micromolar range (6.25-25 microM) in three cell lines in vitro. Rat neuronal PC12 cells exhibited a more pronounced induction (about 10-fold over control at 100 microM) than human lymphoblastoid TK6 cells and rat kidney NRK cells (about 2-fold over control at 100 microM). The role of transporters and receptors in the formation of genomic damage was investigated in PC12 cells, in which the effect of dopamine was reduced by addition of the antioxidants TEMPOL and dimethylthiourea, by inhibitors of the dopamine transporter (GBR 12909 and nomifensine) and by a D2 antagonist (sulpiride). Antioxidative effects of nomifensine and sulpiride, but not of GBR 12909, were excluded, since they did not protect oxidative stress sensitive HL-60 cells from hydrogen peroxide-induced damage in the comet assay. Thus, the transport of dopamine into the cell and the signalling upon binding to D2 receptors was required for the genotoxic effect of dopamine in PC12 cells, which was mediated by intracellular dopamine oxidation products and/or reactive oxygen species.
Insights
Dopamine causes genomic damage, like micronucleus formation, in cells. This effect requires dopamine transport and D2 receptor signaling, involving reactive oxygen species.
Area of Science:
- Neuroscience
- Toxicology
- Genetics
Background:
- Dopamine alterations are implicated in various human diseases and treatments.
- Understanding dopamine's cellular effects is crucial for pharmacology.
Purpose of the Study:
- To investigate the genotoxic potential of dopamine in vitro.
- To elucidate the mechanisms underlying dopamine-induced genomic damage, focusing on cell type differences and the roles of transporters and receptors.
Main Methods:
- Exposure of rat neuronal PC12, human lymphoblastoid TK6, and rat kidney NRK cells to dopamine.
- Assessment of genomic damage via micronucleus formation assay.
- Investigating the involvement of dopamine transporters and D2 receptors using specific inhibitors and antagonists.
- Utilizing comet assay to assess oxidative stress sensitivity.
Main Results:
- Dopamine induced genomic damage (micronucleus formation) in a dose-dependent manner across tested cell lines.
- PC12 cells showed a more pronounced response to dopamine compared to TK6 and NRK cells.
- Dopamine's genotoxic effect in PC12 cells was significantly reduced by dopamine transporter inhibitors and a D2 antagonist.
- The protective effects of some compounds were confirmed to be independent of direct antioxidant activity against hydrogen peroxide-induced damage.
Conclusions:
- Dopamine exhibits genotoxic effects in vitro, particularly in neuronal cells.
- Dopamine transport into the cell and subsequent D2 receptor signaling are essential for its genotoxicity.
- The mechanism involves intracellular dopamine oxidation products and/or reactive oxygen species.
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