Related Experiment Video
Updated: Jun 23, 2026
Determination of Mitochondrial Membrane Potential and Reactive Oxygen Species in Live Rat Cortical Neurons
Published on: May 23, 2011
Mitochondrial fragmentation is involved in methamphetamine-induced cell death in rat hippocampal neural progenitor
Changhai Tian1, L Charles Murrin, Jialin C Zheng
1The Laboratory of Neurotoxicology at the Center for Neurovirology & Neurodegenerative Disorders, University of Nebraska Medical Center, Omaha, Nebraska, USA.
Abstract:
Methamphetamine (METH) induces neurodegeneration through damage and apoptosis of dopaminergic nerve terminals and striatal cells, presumably via cross-talk between the endoplasmic reticulum and mitochondria-dependent death cascades. However, the effects of METH on neural progenitor cells (NPC), an important reservoir for replacing neurons and glia during development and injury, remain elusive. Using a rat hippocampal NPC (rhNPC) culture, we characterized the METH-induced mitochondrial fragmentation, apoptosis, and its related signaling mechanism through immunocytochemistry, flow cytometry, and Western blotting. We observed that METH induced rhNPC mitochondrial fragmentation, apoptosis, and inhibited cell proliferation. The mitochondrial fission protein dynamin-related protein 1 (Drp1) and reactive oxygen species (ROS), but not calcium (Ca2+) influx, were involved in the regulation of METH-induced mitochondrial fragmentation. Furthermore, our results indicated that dysregulation of ROS contributed to the oligomerization and translocation of Drp1, resulting in mitochondrial fragmentation in rhNPC. Taken together, our data demonstrate that METH-mediated ROS generation results in the dysregulation of Drp1, which leads to mitochondrial fragmentation and subsequent apoptosis in rhNPC. This provides a potential mechanism for METH-related neurodegenerative disorders, and also provides insight into therapeutic strategies for the neurodegenerative effects of METH.
Insights
Methamphetamine (METH) causes neurodegeneration by damaging neural progenitor cells (NPCs). METH-induced reactive oxygen species (ROS) disrupt dynamin-related protein 1 (Drp1), leading to mitochondrial fragmentation and cell death.
Area of Science:
- Neuroscience
- Cell Biology
- Toxicology
Background:
- Methamphetamine (METH) is known to cause neurodegeneration in dopaminergic neurons.
- The impact of METH on neural progenitor cells (NPCs), crucial for neural repair, is not well understood.
- Understanding METH's effects on NPCs is vital for addressing METH-related neurotoxicity.
Purpose of the Study:
- To investigate the effects of METH on rat hippocampal NPCs (rhNPCs).
- To elucidate the molecular mechanisms underlying METH-induced cell damage in rhNPCs.
- To identify potential therapeutic targets for METH-induced neurodegeneration.
Main Methods:
- Primary rat hippocampal NPC culture.
- Immunocytochemistry, flow cytometry, and Western blotting to assess cell viability, apoptosis, and mitochondrial function.
- Analysis of key proteins involved in mitochondrial dynamics and oxidative stress.
Main Results:
- METH induced mitochondrial fragmentation, apoptosis, and inhibited proliferation in rhNPCs.
- Reactive oxygen species (ROS) and dynamin-related protein 1 (Drp1) were identified as key mediators of METH-induced mitochondrial damage.
- ROS dysregulation led to Drp1 oligomerization and translocation, causing mitochondrial fragmentation.
Conclusions:
- METH-induced ROS generation triggers Drp1 dysregulation, leading to mitochondrial fragmentation and apoptosis in rhNPCs.
- This study reveals a novel mechanism for METH neurotoxicity targeting neural progenitor cells.
- Findings offer insights into potential therapeutic strategies for METH-induced neurodegenerative disorders.
