Abstract
As the brain is a prime immune privileged organ, immune responses in it were not studied as intensively as other peripheral organs in the past. However, the brain is studded with immune cells called microglia, which play important roles particularly in diseased conditions. In addition, from recent descriptive works, we have learned a lot about immune cells in neighboring tissues. Recent progress has rather made it clearer that the immune responses in and around the brain are complicated reactions with both positive and negative effects. And we still have not identified the way(s) we should pursue for clinical applications. Here we introduce microglia and macrophages in the steady state. We also discuss their roles in stroke, a major cause of death and disability in Japan, and Alzheimer's disease, which account for 60 to 70% of dementia.
Published Version
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