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Microglia in the developing brain: from immunity to behaviour
Timm Schlegelmilch1, Katrin Henke, Francesca Peri
1European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany.
Abstract:
For decades, microglia, the resident macrophages of the brain, have been recognized mostly for their role in several, if not all, pathologies affecting the brain. However, several studies under physiological conditions demonstrate that microglial function is indispensable also in the healthy brain. Indeed, microglia implement key functions already during development, such as the clearance of the huge amount of neurons that are produced in large excess in the embryo and later die of apoptosis. Beside these classical functions, however, novel roles are emerging that strikingly link microglia with higher order brain functions and show that these cells can ultimately influence behaviour. Therefore a detailed understanding of microglia under physiological conditions may open unprecedented perspectives in the prevention and treatment of neuropsychiatric diseases.
Insights
Microglia, the brain's immune cells, are crucial for healthy brain function and development. Understanding their roles in a healthy brain opens new avenues for treating neuropsychiatric diseases.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia, the brain's resident macrophages, are traditionally linked to brain pathologies.
- Emerging evidence highlights their essential roles in the healthy brain.
- Microglial functions are critical from early development through adulthood.
Purpose of the Study:
- To explore the indispensable functions of microglia in the healthy brain.
- To investigate the novel roles of microglia in higher-order brain functions and behavior.
- To establish the therapeutic potential of understanding microglial physiology for neuropsychiatric disorders.
Main Methods:
- Review of existing literature on microglial function.
- Analysis of studies detailing microglial roles during development and in physiological conditions.
- Synthesis of evidence linking microglial activity to cognitive and behavioral outcomes.
Main Results:
- Microglia perform essential functions during brain development, including apoptotic neuronal clearance.
- Beyond classical roles, microglia are increasingly recognized for influencing higher cognitive functions.
- These cells play a significant role in modulating behavior.
Conclusions:
- Microglia are vital for maintaining brain health and function throughout life.
- Understanding microglia in physiological states offers new therapeutic targets for neuropsychiatric diseases.
- Further research into microglial roles can revolutionize the prevention and treatment of brain disorders.
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