2003), indicating a delivery of PDGF‐C from somewhere else. As such, not only tissue interstitial fluid but also glomerular filtrate might be candidates of the transit route for PDGF‐C, as we demonstrated elevation of urinary PDGF‐C in diabetic model mice. Interestingly, infusion of PDGF‐C accelerated glomerular capillary repair via PDGFR‐α on the glomerular endothelial cells in the early mesangiolytic phase of mesangioproliferative glomerulonephritis in rats (Boor et al. 2010). Here, PDGFRA is linked to glomerulonephritis.