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  • Corneal nonmyelinating Schwann cells illuminated by single-cell transcriptomics and visualized by protein biomarkers.

Corneal nonmyelinating Schwann cells illuminated by single-cell transcriptomics and visualized by protein biomarkers.

Journal of neuroscience research (2020-11-17)
Paola Bargagna-Mohan, Gwendolyn Schultz, Bruce Rheaume, Ephraim F Trakhtenberg, Paul Robson, Sonali Pal-Ghosh, Mary Ann Stepp, Katherine S Given, Wendy B Macklin, Royce Mohan
ABSTRACT

The cornea is the most innervated tissue in the human body. Myelinated axons upon inserting into the peripheral corneal stroma lose their myelin sheaths and continue into the central cornea wrapped by only nonmyelinating corneal Schwann cells (nm-cSCs). This anatomical organization is believed to be important for central vision. Here we employed single-cell RNA sequencing (scRNA-seq), microscopy, and transgenics to characterize these nm-cSCs of the central cornea. Using principal component analysis, uniform manifold approximation and projection, and unsupervised hierarchal cell clustering of scRNA-seq data derived from central corneal cells of male rabbits, we successfully identified several clusters representing different corneal cell types, including a unique cell cluster representing nm-cSCs. To confirm protein expression of cSC genes, we performed cross-species validation, employing corneal whole-mount immunostaining with confocal microscopy in mouse corneas. The expression of several representative proteins of nm-cSCs were validated. As the proteolipid protein 1 (PLP1) gene was also expressed in nm-cSCs, we explored the Plp1-eGFP transgenic reporter mouse line to visualize cSCs. Specific and efficient eGFP expression was observed in cSCs in adult mice of different ages. Of several putative cornea-specific SC genes identified, Dickkopf-related protein 1 was shown to be present in nm-cSCs. Taken together, our findings, for the first time, identify important insights and tools toward the study nm-cSCs in isolated tissue and adult animals. We expect that our results will advance the future study of nm-cSCs in applications of nerve repair, and provide a resource for the study of corneal sensory function.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Anti-Beta III Tubulin Antibody, Chemicon®, from chicken
Sigma-Aldrich
Anti-PLP1 (ab1) antibody produced in rabbit, affinity isolated antibody
Sigma-Aldrich
Anti-GFRα3 antibody produced in rabbit, IgG fraction of antiserum, buffered aqueous solution
Sigma-Aldrich
Anti-Neural Cell Adhesion Molecule L1 Antibody, clone 324, clone 324, Chemicon®, from rat