Adult spinal cord radial glia display a unique progenitor phenotype

Area of Science:

• Neuroscience
• Developmental Biology
• Stem Cell Biology

Background:

• Radial glia (RG) are key embryonic progenitors expressing Brain Lipid Binding Protein (Blbp, also known as Fabp7) and Glial Fibrillary Acidic Protein (Gfap).
• Understanding the distribution and characteristics of spinal cord radial glia (SCRG) is crucial for regenerative medicine.

Purpose of the Study:

• To identify and characterize the distribution of SCRG in the spinal cord.
• To investigate the gene expression profile of SCRG and compare it with other neural stem cells (NSCs).
• To explore the potential of SCRG in spinal cord injury repair.

Main Methods:

• Utilized Blbp and Gfap transcripts to locate SCRG and analyze gene expression in the Allen Spinal Cord Atlas (ASCA).
• Employed a Fabp7-EGFP reporter mouse for visualizing SCRG distribution and morphology.
• Performed confocal analysis of NSC-enriched proteins and gene ontology analysis.

Main Results:

• Identified SCRG in a non-ventricular niche at the pial boundary, expressing a unique set of 122 genes, many shared with subventricular zone (SVZ) and central canal (CC) progenitors.
• Observed SCRG extending processes throughout the spinal cord white matter, with abundance increasing caudally.
• Found that postnatal SCRG and CC progenitors are heterogeneous and become activated following spinal cord lesions.

Conclusions:

• SCRG represent a distinct and heterogeneous progenitor population in the postnatal spinal cord.
• A shared gene set between SCRG and other progenitors is enriched in genes linked to human disease.
• SCRG possess unique regulatory pathways that could be harnessed for spinal cord repair and disease treatment.