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Updated: Jul 29, 2026
Dorsal Root Ganglia Neurons and Differentiated Adipose-derived Stem Cells: An In Vitro Co-culture Model to Study Peripheral Nerve Regeneration
Published on: February 26, 2015
Dorsal root ganglia cocultured with macrophages: an in vitro model to study experimental demyelination
W Brück1, Y Brück, U Diederich
1Institut für Neuropathologie, Georg-August-Universität, Göttingen, Germany.
Abstract:
The present investigation introduces an in vitro model to study macrophage properties during demyelination. Rat dorsal root ganglia (DRG) were cultured for obtaining myelinated peripheral nerve fibers. These cultures were exposed to non-resident macrophages. In untreated control cultures, there was no indication of myelin removal by the added macrophages. DRG were exposed to enzymatically generated oxygen radicals using the xanthin/xanthin oxidase or the glucose/glucose oxidase system. Assessment of Schwann cell viability and ultrastructural morphology revealed different patterns of cell cytotoxicity and morphological changes in different experiments. High concentrations caused complete tissue necrosis of the DRG, while low concentrations did not affect either cell viability or ultrastructural morphology. Under intermediate experimental conditions, oxygen radicals caused non-lethal Schwann cell damage leading to Schwann cell retraction and myelin sheath rejection. Myelin lamellae were disrupted and decompacted. These changes were followed by a selective macrophage attack on myelin sheaths, resulting in demyelination. Axons, Schwann cells and sensory ganglion cells survived this attack. The specificity of the oxygen radical effects was tested in experiments using the oxygen radical scavengers catalase and superoxide dismutase. Catalase prevented the described effects on cell morphology and subsequently blocked demyelination by non-resident macrophages.
Insights
This study developed an in vitro model to investigate demyelination. Oxygen radicals induced Schwann cell damage, leading to macrophage-mediated myelin removal while sparing axons and neurons.
Area of Science:
- Neuroscience
- Cell Biology
- Immunology
Background:
- Demyelination is a key feature of neurological disorders.
- Understanding macrophage roles in myelin breakdown is crucial.
- Existing models lack the ability to study specific demyelination triggers.
Purpose of the Study:
- To establish an in vitro model for studying macrophage-mediated demyelination.
- To investigate the role of oxygen radicals in initiating demyelination.
- To analyze the specific mechanisms of myelin sheath rejection and subsequent macrophage attack.
Main Methods:
- Culture of rat dorsal root ganglia (DRG) to obtain myelinated nerve fibers.
- Exposure of cultures to non-resident macrophages.
- Induction of oxidative stress using enzymatic oxygen radical generation (xanthine/xanthine oxidase or glucose/glucose oxidase).
- Assessment of Schwann cell viability and ultrastructure.
- Inhibition studies using oxygen radical scavengers (catalase, superoxide dismutase).
Main Results:
- Intermediate concentrations of oxygen radicals caused non-lethal Schwann cell damage, retraction, and myelin sheath rejection.
- Macrophages selectively attacked and removed damaged myelin.
- Axons, Schwann cells, and sensory ganglion cells remained viable.
- Catalase effectively prevented oxygen radical-induced damage and subsequent demyelination.
Conclusions:
- An in vitro model was successfully developed to study demyelination.
- Oxygen radicals play a critical role in initiating demyelination by damaging Schwann cells.
- Macrophages selectively eliminate damaged myelin, suggesting a targeted role in demyelination.
- This model provides insights into the early events of demyelination and potential therapeutic targets.
