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Related Experiment Video

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Modeling oxidative stress on neuronal dendrites and dendritic spines.

Andreas P Katsenos1, Efstathia Kotoula2, Stavroula Sereti2

  • 1Laboratory of Physiology, Faculty of Medicine, School of Health Sciences, University of Ioannina 45110 Ioannina, Greece; Nanomedicine and Nanobiotechnology Research Group, University of Ioannina 45110 Ioannina, Greece.

Neuroscience
|November 28, 2025
PubMed
Summary

Mild oxidative stress from hydrogen peroxide significantly alters neuronal morphology, specifically dendritic structures, before causing cell death. This finding establishes a new model for studying early neurodegenerative changes and potential antioxidant therapies.

Keywords:
Dendritic morphologyHydrogen peroxideNeurodegenerationOxidative stress

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Pharmacology

Background:

  • Oxidative stress is implicated in neurodegenerative diseases, causing neuronal dysfunction and death.
  • Developing effective antioxidant therapies for neurons has yielded controversial results.
  • A reliable in vitro model is needed to study early-stage neurodegeneration.

Purpose of the Study:

  • To establish a reproducible in vitro oxidative stress model in primary hippocampal neurons.
  • To investigate the effects of hydrogen peroxide (H2O2) on neuronal morphology, focusing on dendritic alterations.
  • To assess if morphological changes precede cell death markers in early neurodegeneration.

Main Methods:

  • Primary hippocampal neurons were cultured and exposed to varying concentrations of H2O2.
  • Cell viability, apoptosis, necrosis, and reactive oxygen species were measured using assays and flow cytometry.
  • Neuronal dendritic morphology (length, branching, spine density) was quantified using ImageJ after immunostaining.

Main Results:

  • 100 μM H2O2 exposure for 24 hours induced significant alterations in dendritic morphology (p < 0.05).
  • These morphological changes occurred without a significant impact on overall cell viability.
  • Dendritic and spine alterations appear to be sensitive indicators of mild oxidative stress.

Conclusions:

  • Hydrogen peroxide at specific concentrations can induce morphological changes in neurons, mimicking early neurodegenerative events.
  • Dendritic and spine alterations serve as early, sensitive markers of neuronal oxidative stress, preceding apoptosis.
  • This model is valuable for studying the initial stages of neurodegenerative disorders and evaluating antioxidant agents.