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Serum withdrawal potentiates the toxic effects of methamphetamine in vitro
1Molecular Neuropsychiatry Section, NIH/NIDA, Intramural Research Program, Baltimore, Maryland 21224, USA. jcadet@intra.nida.nih.gov
Abstract:
Methamphetamine (METH) has been shown to cause neurotoxic damage both in vitro and in vivo. The mechanisms of action are thought to involve the production of pathophysiologic concentration of free radicals. The present study was undertaken to assess the toxic effects of METH caused dose-dependent increased production of reactive oxygen species (ROS) and cell death. Cell death caused by METH was characterized by cytoplasmic vacuolar formation, shrinkage of cytoplasm and nuclear dissolution. Flow cytometric evaluation also revealed that this toxin causes changes similar to those observed in cells undergoing apoptosis. When taken together these observations suggest the METH can cause these cells to die via apoptosis. Further experiments indicated that growth of these cells in low (1%) serum or in the absence of serum markedly enhanced the apoptotic effects of METH. These data provide further support for the ideas that METH can cause ROS-mediated apoptosis.
Insights
Methamphetamine (METH) causes neurotoxic damage by increasing reactive oxygen species (ROS), leading to dose-dependent cell death. This cell death resembles apoptosis, particularly when cells are deprived of serum.
Area of Science:
- Neuroscience
- Toxicology
- Cell Biology
Background:
- Methamphetamine (METH) is known to induce neurotoxicity through various mechanisms.
- Oxidative stress, involving free radicals and reactive oxygen species (ROS), is a proposed pathway for METH-induced damage.
Purpose of the Study:
- To investigate the dose-dependent effects of METH on reactive oxygen species (ROS) production and cell death.
- To characterize the morphological and flow cytometric features of METH-induced cell death.
- To examine the influence of serum concentration on METH-induced apoptosis.
Main Methods:
- Cell cultures were treated with varying doses of METH.
- Reactive oxygen species (ROS) production was measured.
- Cell death was assessed using morphological analysis and flow cytometry.
- Experiments were conducted in media with different serum concentrations (1% or no serum).
Main Results:
- METH exposure resulted in a dose-dependent increase in ROS production.
- METH-induced cell death exhibited characteristics of apoptosis, including cytoplasmic vacuolization, shrinkage, and nuclear dissolution.
- Flow cytometry confirmed apoptotic changes in METH-treated cells.
- Reduced serum conditions significantly enhanced METH-induced apoptosis.
Conclusions:
- Methamphetamine (METH) induces cell death via a reactive oxygen species (ROS)-mediated apoptotic pathway.
- Serum deprivation exacerbates METH's apoptotic effects, highlighting the role of oxidative stress in METH neurotoxicity.