Background: Mechanisms of accelerated atherothrombosis in patients with chronic kidney disease (CKD) are only partly characterized. The aims of this study were to evaluate the extent of thromboxane (TX)-dependent platelet activation in patients with CKD, and to characterize the determinants of altered TX biosynthesis in this setting, with particular reference to enhanced lipid peroxidation, low grade inflammation and CKD-related anemia. Patients and methods: A cross sectional comparison between urinary 8-iso-PGF(2 alpha) and 11-dehydro-TXB2, in vivo markers of oxidative stress and platelet activation, respectively, was performed in 115 patients with stage 1-4 CKD. Results: Levels of both urinary 11-dehydro-TXB2 and 8-iso-PGF2 alpha increased sequentially across the four CKD stages (P < 0.0001, Kruskal-Wallis test). Both urinary prostanoids were inversely associated with either estimated glomerular filtration rate (eGFR, P < 0.0001) or hemoglobin levels (P < 0.0001). A significant direct correlation was also observed between urinary 11-dehydro-TXB2 and 8-iso-PGF(2 alpha) (Rho = 0.620, P < 0.0001). On multivariate analysis, urinary 8-iso-PGF(2 alpha) (beta = 0.459, P < 0.0001), hemoglobin levels (beta = -0.261, P = 0.002) and eGFR (beta = -0.172, P = 0.032) were independent predictors of urinary 11-dehydro-TXB2 (adjusted R-2 = 0.488). Conclusions: This study provides biochemical evidence of persistent platelet activation in patients with CKD. This condition occurs early in the natural history of the disease and is related to kidney function and oxidative stress. Moreover, we found an independent inverse relationship between hemoglobin levels and TX-dependent platelet activation. This finding may provide a mechanistic link between CKD-related anemia and increased cardiovascular risk. (C) 2016 European Federation of Internal Medicine. Published by Elsevier B.V. All rights reserved.
Determinants of thromboxane biosynthesis in patients with moderate to severe chronic kidney disease
Ferroni P;
2016-01-01
Abstract
Background: Mechanisms of accelerated atherothrombosis in patients with chronic kidney disease (CKD) are only partly characterized. The aims of this study were to evaluate the extent of thromboxane (TX)-dependent platelet activation in patients with CKD, and to characterize the determinants of altered TX biosynthesis in this setting, with particular reference to enhanced lipid peroxidation, low grade inflammation and CKD-related anemia. Patients and methods: A cross sectional comparison between urinary 8-iso-PGF(2 alpha) and 11-dehydro-TXB2, in vivo markers of oxidative stress and platelet activation, respectively, was performed in 115 patients with stage 1-4 CKD. Results: Levels of both urinary 11-dehydro-TXB2 and 8-iso-PGF2 alpha increased sequentially across the four CKD stages (P < 0.0001, Kruskal-Wallis test). Both urinary prostanoids were inversely associated with either estimated glomerular filtration rate (eGFR, P < 0.0001) or hemoglobin levels (P < 0.0001). A significant direct correlation was also observed between urinary 11-dehydro-TXB2 and 8-iso-PGF(2 alpha) (Rho = 0.620, P < 0.0001). On multivariate analysis, urinary 8-iso-PGF(2 alpha) (beta = 0.459, P < 0.0001), hemoglobin levels (beta = -0.261, P = 0.002) and eGFR (beta = -0.172, P = 0.032) were independent predictors of urinary 11-dehydro-TXB2 (adjusted R-2 = 0.488). Conclusions: This study provides biochemical evidence of persistent platelet activation in patients with CKD. This condition occurs early in the natural history of the disease and is related to kidney function and oxidative stress. Moreover, we found an independent inverse relationship between hemoglobin levels and TX-dependent platelet activation. This finding may provide a mechanistic link between CKD-related anemia and increased cardiovascular risk. (C) 2016 European Federation of Internal Medicine. Published by Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
