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Mertk-expressing microglia influence oligodendrogenesis and myelin modelling in the CNS
Linda T Nguyen1,2, Andrea Aprico1, Eze Nwoke1,3
1The Florey Institute of Neuroscience and Mental Health, Parkville, Melbourne, Australia.
Background:
Microglia, an immune cell found exclusively within the CNS, initially develop from haematopoietic stem cell precursors in the yolk sac and colonise all regions of the CNS early in development. Microglia have been demonstrated to play an important role in the development of oligodendrocytes, the myelin producing cells in the CNS, as well as in myelination. Mertk is a receptor expressed on microglia that mediates immunoregulatory functions, including myelin efferocytosis.
Findings:
Here we demonstrate an unexpected role for Mertk-expressing microglia in both oligodendrogenesis and myelination. The selective depletion of Mertk from microglia resulted in reduced oligodendrocyte production in early development and the generation of pathological myelin. During demyelination, mice deficient in microglial Mertk had thinner myelin and showed signs of impaired OPC differentiation. We established that Mertk signalling inhibition impairs oligodendrocyte repopulation in Xenopus tadpoles following demyelination.
Conclusion:
These data highlight the importance of microglia in myelination and are the first to identify Mertk as a regulator of oligodendrogenesis and myelin ultrastructure.
Insights
Microglia regulate brain development and repair. Mertk receptor on microglia is crucial for producing healthy myelin and supporting oligodendrocyte development, impacting central nervous system health.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia are the resident immune cells of the central nervous system (CNS), originating from early embryonic hematopoietic stem cells.
- These cells play critical roles in CNS development, including oligodendrocyte development and myelination.
- Mertk is a microglial receptor involved in immune functions like clearing myelin debris (efferocytosis).
Purpose of the Study:
- To investigate the role of Mertk-expressing microglia in oligodendrogenesis and myelination.
- To determine the impact of Mertk signaling on myelin integrity and repair processes.
Main Methods:
- Selective depletion of Mertk from microglia in mouse models.
- Assessment of oligodendrocyte production and myelin pathology.
- Xenopus tadpole models to study demyelination and remyelination.
Main Results:
- Depletion of microglial Mertk led to reduced oligodendrocyte production during development.
- Mice lacking microglial Mertk exhibited pathological myelin and thinner myelin during demyelination.
- Impaired oligodendrocyte precursor cell (OPC) differentiation was observed in Mertk-deficient mice.
- Mertk signaling inhibition hindered oligodendrocyte repopulation in Xenopus following demyelination.
Conclusions:
- Microglia are essential for proper myelination in the CNS.
- Mertk signaling in microglia is identified as a key regulator of oligodendrogenesis.
- Mertk influences the ultrastructure and integrity of myelin.
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