Fig. 6.
Immunoblots of proteins in human urine exosomes (Urine) and kidney regions (Cortex, Outer Medulla, and Inner Medulla). Immunoblots were probed with antibodies to the following proteins: ACE, angiotensin-converting enzyme; ALIX, ALG-2 interacting protein X; APN; AQP1; AQP2; CA4, carbonic anhydrase type IV; CD9; CLIC1, chloride intracellular channel-1; αENaC, epithelial sodium channel α; βENaC, epithelial sodium channel β; γENaC, epithelial sodium channel γ; MUC1, mucin-1; NCC; NKCC2, Na-K-2Cl cotransporter type 2; PODXL, podocalyxin; RAB4; RAB5B; RAB11; SNX18, sorting nexin-18; sorcin; TSG101; and PC1, polycystin-1. In the PC1 immunoblot, an additional lane was added (PC1+), which was loaded with PC1 protein extracted from Madin-Darby canine kidney cells with stable expression of human PC1 protein (a kind gift of Feng Qian, The Johns Hopkins University, Baltimore).