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Microglia/macrophage polarization: Fantasy or evidence of functional diversity?
1Pittsburgh Institute of Brain Disorders and Recovery, Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
Abstract:
Microglia and non-parenchymal macrophages are increasingly recognized to play critical roles in the central nervous system (CNS) health and disease. Accumulating evidence suggests that these mononuclear phagocytes do not constitute stereotypical cell populations, but rather polarize into a variety of phenotypes at different stages of CNS development, stresses, and diseases. This commentary aims to discuss our current consensus and controversy on microglia/macrophage phenotypes. Collective single-cell level evidence validates the concept of microglia/macrophage polarization, while suggests multi-polarity instead of dichotomic polarization. Characterizing the functions of a specific microglia/macrophage phenotype is challenging yet essential to translate our scientific discoveries into clinical application.
Insights
Microglia and macrophages in the central nervous system (CNS) exhibit diverse phenotypes, not just simple polarization. Understanding these complex cell states is crucial for advancing CNS disease research and therapies.
Area of Science:
- Neuroimmunology
- Cellular Biology
- Central Nervous System (CNS) Research
Background:
- Microglia and non-parenchymal macrophages are key immune cells in the CNS.
- These cells are increasingly recognized for their roles in CNS health and disease.
- Evidence suggests these cells exist in various phenotypes, not fixed states.
Purpose of the Study:
- To discuss current understanding and debates surrounding microglia/macrophage phenotypes.
- To highlight the concept of cell polarization in these immune cells.
- To emphasize the need for precise functional characterization.
Main Methods:
- Review of accumulating evidence.
- Analysis of single-cell level data.
- Discussion of consensus and controversy in the field.
Main Results:
- Single-cell data support microglia/macrophage polarization.
- Evidence points towards multi-polarity rather than simple dichotomic polarization.
- The diversity of phenotypes is validated across CNS development, stress, and disease.
Conclusions:
- Microglia and macrophages display a spectrum of phenotypes.
- Moving beyond a binary polarization model is necessary.
- Accurate characterization of specific phenotypes is vital for clinical translation in CNS disorders.
