Abstract：
:Cellular crescents are typically inflammatory and associated with rapidly progressive glomerulonephritis. Their pathogenesis involves glomerular basement membrane rupture due to circulating or intrinsic factors. Crescents associated with diabetic glomerulosclerosis are rarely reported. Furthermore, the nature of cells forming crescents in diabetes is unknown. To investigate the nature of crescents in diabetes, we examined renal biopsies from diabetic patients with nodular glomerulosclerosis and crescents (n = 2), diabetes without crescents (n = 5), nondiabetic renal biopsies (n = 3), and crescentic glomerulonephritis with inflammatory crescents (n = 5). Electron microscopy and confocal immunofluorescence analysis with antibodies against nephrin (a podocyte marker) and claudin 1 (parietal epithelial cell marker) were performed. Diabetic glomeruli with crescents contained a mixture of crescentic cells expressing either claudin 1 (11 ± 1.4 cells/glomerulus) or nephrin (5.5 ± 3.0 cells/glomerulus). Rare crescentic cells coexpressed nephrin and claudin 1 (2.5 ± 1.6 cells/glomerulus). In contrast, inflammatory crescents were almost exclusively composed of claudin 1-positive cells (25 ± 5.3 cells/glomerulus). Cells coexpressing claudin 1 and nephrin were absent in inflammatory crescents and all cases without crescents. Electron microscopy showed podocyte bridge formation between the glomerular basement membrane and parietal basement membrane but no glomerular basement membrane rupture as in inflammatory crescents. Crescents in diabetes may occur in diabetes in the absence of a secondary etiology and are composed of a mixture of parietal epithelial cells and visceral podocytes. Cells coexpressing parietal epithelial and podocyte markers suggest that parietal epithelial cells may transdifferentiate into podocytes in response to severe glomerular injury.
journal_name
Hum Patholjournal_title
Human pathologyauthors
Gaut JP,Hoshi M,Jain S,Liapis Hdoi
10.1016/j.humpath.2013.10.030subject
Has Abstractpub_date
2014-03-01 00:00:00pages
628-35issue
3eissn
0046-8177issn
1532-8392pii
S0046-8177(13)00473-5journal_volume
45pub_type
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