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Updated: May 12, 2026
Generating and Co-culturing Murine Primary Microglia and Cortical Neurons
Published on: July 26, 2024
Neuron-microglia interaction in neuroinflammation
1Department of Neuroimmunology, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan, Furo-cho, Chikusa, Nagoya 464-8601 Japan. suzumura@riem.nagoya-u.ac.jp
Abstract:
Microglia are monocyte-macrophage lineage cells, while other glial cells are neuroectodermal origin. Accumulation of microglia is commonly observed around degenerating neurons. There, microglia produce a variety of factors and function both neurotoxic and neuroprotective. Thus, accumulation of glia in various neurological disorders is not a static scar, gliosis, but more actively involved in degeneration and regeneration as neuroinflammation. We have shown previously that the most neurotoxic factor from activated microglia is glutamate, and that the suppression of glutamate release from microglia results in amelioration of disease progression in animal models of neurodegenerative disorders. On the other hands, when exposed to harmful stimuli, neurons also produce various factors as "help me" signals. Recently, we found that a CX3C chemokine, fractalkine (FKN), and interleukin-34 (IL-34) were secreted from damaged neurons. FKN and IL-34 differently activated microglia to rescue neurons by upregulating phagocytosis of toxicants or damaged debris, and production of anti-oxidant enzyme. The bi-directional interaction between neurons and microglia is important for understanding of chronic neuroinflammation, and gives us clues for future therapeutic strategy against neurodegenerative disorders.
Insights
Microglia and neurons engage in bidirectional communication influencing neuroinflammation. Targeting this interaction offers potential therapeutic strategies for neurodegenerative diseases.
Area of Science:
- Neuroscience
- Immunology
Background:
- Microglia, immune cells of the central nervous system, accumulate around degenerating neurons.
- This glial accumulation, known as gliosis, is actively involved in neuroinflammation, contributing to both degeneration and regeneration.
- Activated microglia release factors, including glutamate, which can be neurotoxic.
Purpose of the Study:
- To investigate the role of microglia-neuron interactions in neuroinflammation.
- To identify neuronal "help me" signals and their effects on microglia.
- To explore therapeutic strategies targeting neuroinflammation in neurodegenerative disorders.
Main Methods:
- Previous studies demonstrated glutamate as a key neurotoxic factor from microglia.
- Recent findings identified fractalkine (FKN) and interleukin-34 (IL-34) as neuronal "help me" signals.
- Analysis of how FKN and IL-34 activate microglia to modulate neuronal health.
Main Results:
- Suppression of microglial glutamate release ameliorates disease progression in animal models.
- FKN and IL-34 secreted by damaged neurons activate microglia differently.
- Activated microglia upregulate phagocytosis and antioxidant enzyme production, aiding neuronal rescue.
Conclusions:
- The bi-directional communication between neurons and microglia is crucial for understanding chronic neuroinflammation.
- Neuronal signals like FKN and IL-34 modulate microglial responses.
- This interaction provides insights for developing future therapeutic strategies against neurodegenerative disorders.
