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The role of microglia in brain maintenance: implications for Rett syndrome
Noël C Derecki1, James C Cronk, Jonathan Kipnis
1Center for Brain Immunology and Glia and Department of Neuroscience, University of Virginia, Charlottesville, VA 22908, USA. ncd3z@virginia.edu
Abstract:
The role of microglia in central nervous system (CNS) pathology has been studied extensively, and more recently, examination of microglia in the healthy brain has yielded important insights into their many functions. It was long assumed that microglia were essentially quiescent cells, unless provoked into activation, which was considered a hallmark of disease. More recently, however, it has become increasingly clear that they are extraordinarily dynamic cells, constantly sampling their environment and adjusting to exquisitely delicate stimuli. Along these lines, our laboratory has identified a new and unexpected role for microglial phagocytosis - or lack thereof - in the pathophysiology of Rett syndrome, a neurodevelopmental disease caused by mutation of the gene encoding methyl-CpG binding protein (MECP)2. We have shown that specific expression of wild type Mecp2 in myeloid cells of Mecp2-null mice is sufficient to arrest major symptoms associated with this devastating disease. This beneficial effect, however, is abolished if phagocytic activity of microglia is inhibited. Here, we discuss microglial origins, the role of microglia in brain development and maintenance, and the phenomenon of microglial augmentation by myeloid progenitor cells in the adult brain. Finally, we address in some detail the beneficial roles of microglia as clinical targets in Rett syndrome and other neurological disorders.
Insights
Microglia, immune cells in the brain, play a critical role in Rett syndrome. Inhibiting microglial phagocytosis worsens symptoms, highlighting their therapeutic potential for neurological disorders.
Area of Science:
- Neuroscience
- Immunology
- Genetics
Background:
- Microglia, the resident immune cells of the central nervous system (CNS), were once thought to be quiescent unless activated during disease.
- Recent research reveals microglia are dynamic, constantly monitoring their environment and responding to subtle stimuli.
- Rett syndrome is a neurodevelopmental disorder caused by mutations in the methyl-CpG binding protein 2 (MECP2) gene.
Purpose of the Study:
- To investigate the role of microglial phagocytosis in the pathophysiology of Rett syndrome.
- To explore the potential of microglia as a therapeutic target for Rett syndrome and other neurological disorders.
Main Methods:
- Utilized Mecp2-null mouse models to study Rett syndrome.
- Investigated the effects of specific expression of wild-type Mecp2 in myeloid cells.
- Examined the impact of inhibiting microglial phagocytic activity on disease symptoms.
Main Results:
- Specific expression of wild-type Mecp2 in myeloid cells ameliorated major symptoms of Rett syndrome in mice.
- The beneficial effect of Mecp2 expression was abolished when microglial phagocytosis was inhibited.
- Demonstrated a critical role for microglial phagocytosis in the context of Rett syndrome.
Conclusions:
- Microglial phagocytosis, or its absence, is integral to the pathophysiology of Rett syndrome.
- Targeting microglial function, particularly phagocytosis, represents a promising therapeutic strategy for Rett syndrome.
- Further research into microglial roles in CNS development, maintenance, and disease is warranted.
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