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Survival of developing dopaminergic neurons in reaggregate tissue culture following treatment with methamphetamine
P J Kontur1, L A Won, P C Hoffmann
1Department of Pharmacological and Physiological Sciences, University of Chicago, IL 60637.
Abstract:
Developing central dopamine (DA)-containing neurons in rotation-mediated reaggregate tissue culture exposed to 10(-4) M methamphetamine for 1 week (at a time corresponding to the 2nd week of postnatal development) exhibit decreased DA levels. DA neurons were visualized either by a histofluorescent method after 'loading' with exogenous DA, or by tyrosine hydroxylase (TH) immunocytochemistry. An apparent loss of histofluorescent DA cell bodies was observed due to a methamphetamine-induced reduction in exogenous DA accumulation. No decrease in the number of TH-immunoreactive neurons was observed. Thus, developing DA neurons when visualized by TH immunocytochemistry survive despite methamphetamine-induced reductions in DA levels.
Insights
Methamphetamine exposure reduces dopamine (DA) levels in developing DA neurons. However, these neurons survive, as shown by tyrosine hydroxylase (TH) immunocytochemistry, despite lower DA accumulation.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Developing central dopamine (DA) neurons are crucial for various brain functions.
- Methamphetamine exposure during critical developmental periods can impact neuronal function and survival.
- Accurate assessment of neuronal health requires reliable visualization methods.
Purpose of the Study:
- To investigate the effects of methamphetamine on developing dopamine (DA) neurons.
- To compare different methods for visualizing DA neurons and assessing their survival under drug exposure.
- To determine if methamphetamine exposure impacts the survival of developing DA neurons.
Main Methods:
- Utilized rotation-mediated reaggregate tissue culture of developing central DA neurons.
- Exposed cultures to 10(-4) M methamphetamine during the equivalent of the 2nd week of postnatal development.
- Visualized DA neurons using histofluorescence after exogenous DA loading and tyrosine hydroxylase (TH) immunocytochemistry.
Main Results:
- Methamphetamine exposure led to decreased DA levels in developing DA neurons.
- Histofluorescence revealed an apparent loss of DA neuron cell bodies due to reduced exogenous DA uptake.
- Tyrosine hydroxylase (TH) immunocytochemistry showed no decrease in the number of DA neurons, indicating survival.
Conclusions:
- Developing DA neurons survive methamphetamine-induced reductions in DA levels.
- Tyrosine hydroxylase (TH) immunocytochemistry is a reliable method for assessing the survival of DA neurons.
- Methamphetamine exposure affects DA accumulation but not the survival of developing DA neurons.