Plasma leakage through glomerular basement membrane ruptures triggers the proliferation of parietal epithelial cells and crescent formation in non-inflammatory glomerular injury

The Journal of Pathology
Mi RyuHans-Joachim Anders

Abstract

Glomerular crescents are most common in rapidly progressive glomerulonephritis but also occur in non-inflammatory chronic glomerulopathies; thus, factors other than inflammation should trigger crescent formation, eg vascular damage and plasma leakage. Here we report that Alport nephropathy in Col4A3-deficient Sv129 mice is complicated by diffuse and global crescent formation in which proliferating parietal epithelial cells are the predominant cell type. Laminin staining and transmission and acellular scanning electron microscopy of acellular glomeruli documented disruptions and progressive disintegration of the glomerular basement membrane in Col4A3-deficient mice. FITC-dextran perfusion further revealed vascular leakage from glomerular capillaries into Bowman's space, further documented by fibrin deposits in the segmental crescents. Its pathogenic role was validated by showing that the fibrinolytic activity of recombinant urokinase partially prevented crescent formation. In addition, in vitro studies confirmed an additional mitogenic potential of serum on murine and human parietal epithelial cells. Furthermore, loss of parietal cell polarity and unpolarized secretion of extracellular matrix components were evident within fibro...Continue Reading

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Citations

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