Volume 76, Issue 12, Pages (December 2009)

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Volume 76, Issue 12, Pages 1225-1238 (December 2009) The enigmatic parietal epithelial cell is finally getting noticed: a review  Takamoto Ohse, Jeffrey W. Pippin, Alice M. Chang, Ronald D. Krofft, Jeffrey H. Miner, Michael R. Vaughan, Stuart J. Shankland  Kidney International  Volume 76, Issue 12, Pages 1225-1238 (December 2009) DOI: 10.1038/ki.2009.386 Copyright © 2009 International Society of Nephrology Terms and Conditions

Figure 1 The highlighted areas show the Bowman's basement membrane lined by a monolayer of PECs, surrounding the urinary space. This is typically referred to as Bowman's capsule. PEC, parietal epithelial cells. Kidney International 2009 76, 1225-1238DOI: (10.1038/ki.2009.386) Copyright © 2009 International Society of Nephrology Terms and Conditions

Figure 2 Scanning electron microscopic image of parietal epithelial cells (PECs) lining Bowman's basement membrane. The cell nucleus is indicated by an arrow, cilia are indicated by the black arrowhead, and microvilli are indicated by the white arrowhead. Reprinted with permission from Arakawa and Tokunaga.11 Kidney International 2009 76, 1225-1238DOI: (10.1038/ki.2009.386) Copyright © 2009 International Society of Nephrology Terms and Conditions

Figure 3 Transmission electron microscopic image showing the interface between adjacent parietal epithelial cells (PECs) and a tight junction near the top (indicated by the arrow). Kidney International 2009 76, 1225-1238DOI: (10.1038/ki.2009.386) Copyright © 2009 International Society of Nephrology Terms and Conditions

Figure 4 Scanning electron microscopic image of the interface between the parietal epithelial cell (PEC) and the proximal tubule at the urinary pole of the glomerulus. Reprinted with permission from Lee et al.118 Kidney International 2009 76, 1225-1238DOI: (10.1038/ki.2009.386) Copyright © 2009 International Society of Nephrology Terms and Conditions

Figure 5 Transmission electron microscopic image of the vascular pole of the glomerulus showing a bridging parietal podocyte (BPP) and foot processes formed on both the glomerular basement membrane (GBM) and Bowman's basement membrane (BBM) sides of the parietal podocyte. Bridging parietal podocytes often bridge the GBM and the BBM, as shown here. Reprinted with permission from Gibson et al.13 A, arteriole of vascular pole; C, pericapsular capillary; CL, capillary loop. Kidney International 2009 76, 1225-1238DOI: (10.1038/ki.2009.386) Copyright © 2009 International Society of Nephrology Terms and Conditions

Figure 6 Schematic of the arrangement of a peripolar cell at the vascular pole of the glomerulus. The peripolar cell sits between the parietal epithelial cells (PECs) and the podocyte, as indicated by the arrow. AA, afferent arteriole; EA, efferent arteriole; MD, macula densa. Reprinted with permission from Gardiner et al.17 Kidney International 2009 76, 1225-1238DOI: (10.1038/ki.2009.386) Copyright © 2009 International Society of Nephrology Terms and Conditions

Figure 7 Transmission electron microscopic image of a peripolar cell with periodic acid Schiff–positive electron-dense granules contained within the cytoplasm. Reprinted with permission of Gardiner et al.17 er, endoplasmic reticulum; m, mitochondria. Kidney International 2009 76, 1225-1238DOI: (10.1038/ki.2009.386) Copyright © 2009 International Society of Nephrology Terms and Conditions

Figure 8 Schematic demonstrating the primary and secondary barriers to proteinuria in the glomerulus. The endothelium, GBM, and podocyte form the primary barrier to protein. The parietal epithelial cells (PECs) with their tight junctions form a secondary barrier to protein and prevent urinary filtrate from escaping into the periglomerular and tubulointerstitial areas. BBM, Bowman’s basement membrane; GBM, glomerular basement membrane; GEN, glomerular endothelial cell. Kidney International 2009 76, 1225-1238DOI: (10.1038/ki.2009.386) Copyright © 2009 International Society of Nephrology Terms and Conditions

Figure 9 Schematic of the procedure for isolating immortalized mouse parietal epithelial cells. Capsulated glomeruli from H-2Kb tsA58 tg mice were selectively isolated, and outgrowths were then subcloned to establish parietal epithelial cells (PECs) in culture that have features of PECs in vivo. Reprinted with permission from Ohse et al.26 Kidney International 2009 76, 1225-1238DOI: (10.1038/ki.2009.386) Copyright © 2009 International Society of Nephrology Terms and Conditions

Figure 10 Proposed schematic of the various responses of parietal epithelial cells (PECs) to injury, which can include secretion of growth factors, increased permeability, epithelial-to-mesenchymal transition (EMT), apoptosis, or proliferation. CTGF, connective tissue growth factor; EGF, endothelial growth factor. Kidney International 2009 76, 1225-1238DOI: (10.1038/ki.2009.386) Copyright © 2009 International Society of Nephrology Terms and Conditions