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Updated: Jul 5, 2026
Primary Microglia Isolation from Mixed Glial Cell Cultures of Neonatal Rat Brain Tissue
Published on: August 15, 2012
Myelin-induced microglial neurotoxicity can be controlled by microglial metabotropic glutamate receptors
Fleur Pinteaux-Jones1, Ioanna G Sevastou, Victoria A H Fry
1Cell Signalling Laboratory, Department of Neuroinflammation, Institute of Neurology, University College London, London, UK.
Abstract:
Microglia are present in an activated state in multiple sclerosis lesions. Incubation of primary cultured rat microglia with rat-brain derived myelin (0.1-1 microg/mL) for 24 h induced microglial activation; cells displayed enhanced ED1 staining, expression of inducible nitric oxide synthase, production and release of the cytokine tumour necrosis factor-alpha and glutamate release. Exposure of microglia to myelin induced the expression of neuronal caspases and ultimately neuronal death in cultured cerebellar granule cell neurons; neurotoxicity was directly because of microglial-derived soluble toxins. Co-incubation of microglia with agonists or antagonists of different metabotropic glutamate receptor (mGluR) subtypes ameliorated microglial neurotoxicity by inhibiting soluble neurotoxin production. Activation of microglial mGluR2 exacerbated myelin-evoked neurotoxicity whilst activation of mGluR3 was protective as was activation of group III mGluRs. These data show that myelin-induced microglial neurotoxicity can be prevented by regulation of mGluRs and suggest these receptors on microglia may be promising targets for therapeutic intervention in multiple sclerosis.
Insights
Myelin activates microglia, causing neurotoxicity in multiple sclerosis models. Targeting specific metabotropic glutamate receptors (mGluRs) on microglia can prevent this damage, offering potential therapeutic strategies.
Area of Science:
- Neuroscience
- Immunology
Background:
- Microglia, the immune cells of the central nervous system, are activated in multiple sclerosis (MS) lesions.
- Myelin, a key component of nerve cells, can trigger microglial activation.
Purpose of the Study:
- To investigate the role of myelin-induced microglial activation in neuronal damage.
- To explore the potential of metabotropic glutamate receptors (mGluRs) as therapeutic targets in MS.
Main Methods:
- Primary rat microglia were incubated with myelin to induce activation.
- Neuronal toxicity was assessed in co-cultured cerebellar granule cells.
- The effects of mGluR agonists and antagonists on microglial neurotoxicity were evaluated.
Main Results:
- Myelin exposure activated microglia, leading to the release of neurotoxic factors and neuronal death.
- Activation of specific mGluR subtypes modulated microglial neurotoxicity.
- mGluR2 activation exacerbated toxicity, while mGluR3 and group III mGluRs activation were protective.
Conclusions:
- Myelin-induced microglial neurotoxicity is mediated by soluble factors.
- Regulation of mGluRs on microglia can prevent neurotoxicity.
- mGluRs represent a promising therapeutic target for multiple sclerosis.
