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Under certain circumstances, podocytes can be partially replaced following their loss in disease. The inability of podocytes to proliferate suggests that replacement derives from other cell types. Because neural/glial antigen 2 (NG2)-expressing cells can serve as progenitors in other organs and because herein we showed increased NG2 staining in podocytes following their loss in experimental focal segmental glomerulosclerosis, we used lineage tracing in NG2-CreER tdTomato mice to test the hypothesis that partial podocyte replacement might derive from this cell population. The percentage of glomeruli with red fluorescence protein (RFP)-labeled NG2 cells increased following podocyte depletion, which was augmented by enalapril. However, BrdU was not detected in RFP-labeled cells, consistent with the migration of these cells to the glomerulus. Within glomeruli, RFP-labeled cells did not coexpress podocyte proteins (p57, synaptopodin, nephrin, or podocin) but did coexpress markers for mesangial (α8 integrin, PDGFβ receptor) and parietal epithelial cells (PAX8, src-suppressed C-kinase substrate). These results suggest that following podocyte depletion, cells of NG2 lineage do not serve as adult podocyte progenitors but have the ability to transdifferentiate to mesangial and parietal epithelial cell fates.

Cells of NG2 lineage increase in glomeruli of mice following podocyte depletion