A dysfunctioning glomerular endothelium was demonstrated in chronic kidney disease (CKD) patients by means of in vitro endothelial cell cytotoxicity test and of in vivo intrarenal hemodynamic study. An enhanced endothelial cell cytotoxicity in CKD patients was 26.5 +/- 12% as compared to 0.4 +/- 1% of control. An altered intrarenal hemodynamics revealed 1) a reduction in renal plasma flow, 190 +/- 67 mL/min/1.73 m2 versus control 595 +/- 45 mL/min/1.73 m2, and in peritubular capillary flow, 149 +/- 55 mL/min/1.73 m2 versus control 479 +/- 46 mL/min/1.73 m2, 2) an elevated intraglomerular hydrostatic pressure, 55 +/- 2 mmHg versus control 51 mmHg, elevated afferent arteriolar resistance, 13184 dyne x s x cm(-5) versus control 2443 +/- 154 dyne x s x cm(5), and elevated efferent arteriolar resistance, 13591 +/- 7591 dyne x s x cm(-5) versus control 3062 +/- 177 dyne x s x cm(-5). Both enhanced endothelial cell cytotoxicity and altered intrarenal hemodynamics reflect glomerular endothelial dysfunction which is likely responsible for the renal disease progression in CKD.
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