Advances in proteomic phenotyping of microglia in neurodegeneration
Sydney Sunna1,2, Christine A Bowen1,2,3, Christina C Ramelow1,2
1Department of Neurology, Emory University, Atlanta, Georgia, USA.
Abstract:
Microglia are dynamic resident immune cells of the central nervous system (CNS) that sense, survey, and respond to changes in their environment. In disease states, microglia transform from homeostatic to diverse molecular phenotypic states that play complex and causal roles in neurologic disease pathogenesis, as evidenced by the identification of microglial genes as genetic risk factors for neurodegenerative disease. While advances in transcriptomic profiling of microglia from the CNS of humans and animal models have provided transformative insights, the transcriptome is only modestly reflective of the proteome. Proteomic profiling of microglia is therefore more likely to provide functionally and therapeutically relevant targets. In this review, we discuss molecular insights gained from transcriptomic studies of microglia in the context of Alzheimer's disease as a prototypic neurodegenerative disease, and highlight existing and emerging approaches for proteomic profiling of microglia derived from in vivo model systems and human brain.
Insights
Microglia, the central nervous system's immune cells, change during disease. Studying their proteins, not just genes, offers better therapeutic targets for neurodegenerative diseases like Alzheimer's.
Area of Science:
- Neuroimmunology
- Central Nervous System (CNS) Biology
- Proteomics
Background:
- Microglia are resident immune cells in the CNS, crucial for sensing and responding to environmental changes.
- In neurological diseases, microglia adopt distinct molecular phenotypes, contributing to pathogenesis.
- Genetic studies link microglial genes to neurodegenerative disease risk.
Purpose of the Study:
- To review molecular insights from microglial transcriptomic studies in Alzheimer's disease.
- To highlight the importance of proteomic profiling for identifying therapeutic targets.
- To discuss current and emerging proteomic approaches for microglia.
Main Methods:
- Analysis of transcriptomic data from human and animal models of neurodegenerative diseases.
- Review of existing and emerging proteomic profiling techniques for microglia.
- Focus on Alzheimer's disease as a model for neurodegeneration.
Main Results:
- Transcriptomic profiling offers insights but only modestly reflects the proteome.
- Proteomic analysis of microglia is more likely to yield functionally and therapeutically relevant targets.
- Microglial gene expression changes significantly in disease states.
Conclusions:
- Proteomic profiling of microglia is essential for understanding their role in neurodegeneration.
- Identifying microglial protein targets can lead to novel therapeutic strategies for CNS diseases.
- Further research into microglial proteomes will advance neurodegenerative disease treatment.
