Screening and Identification of Brain Pericyte-Selective Markers.

Area of Science:

• Neuroscience
• Cell Biology
• Genomics

Background:

• Pericytes are crucial mural cells in the central nervous system (CNS).
• A significant challenge in pericyte research is the absence of specific markers for pericytes and their subpopulations.
• Identifying these markers is vital for understanding pericyte function and heterogeneity in the CNS.

Purpose of the Study:

• To identify novel genes specifically enriched in brain pericytes.
• To find markers that can differentiate pericyte subpopulations from vascular smooth muscle cells (vSMCs).
• To facilitate further research into the distinct roles of pericyte subpopulations in the CNS.

Main Methods:

• Generation of a novel transgenic mouse line with permanent tdTomato labeling of vSMCs.
• Isolation of PDGFRβ+tdTomato- pericytes and PDGFRβ+tdTomato+ vSMCs from mouse brains.
• RNA sequencing (RNAseq) analysis to identify pericyte- and vSMC-enriched genes.

Main Results:

• Identification of 40 pericyte-enriched genes and 158 vSMC-enriched genes.
• Discovery that Pla1a and Cox4i2 are predominantly enriched in subpopulations of brain pericytes.
• Observation that Pla1a and Cox4i2 also mark some non-vascular parenchymal cells, indicating potential broader applications.

Conclusions:

• Pla1a and Cox4i2 show preferential enrichment in brain pericyte subpopulations over vSMCs.
• These genes serve as valuable tools for distinguishing pericyte subpopulations in the brain.
• The findings contribute to a better understanding of pericyte heterogeneity and function in the CNS.