Megan Rossi1, Katrina L Campbell, David W Johnson, Tony Stanton, Brian A Haluska, Carmel M Hawley, Goce Dimeski, Brett C McWhinney, Jacobus P J Ungerer, Omar M Kaisar, Nicole M Isbel. 1. 1 Princess Alexandra Hospital, Brisbane, Queensland, Australia. 2 University of Queensland School of Medicine, Brisbane, Queensland, Australia. 3 Translational Research Institute, Brisbane, Queensland, Australia. 4 Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia. 5 Address correspondence to: Nicole Isbel, Department of Nephrology, Princess Alexandra Hospital, Level 2, ARTS Building, Ipswich Road, Woolloongabba, Brisbane, Queensland 4102, Australia.
Abstract
BACKGROUND: Emerging evidence suggests that uremic toxins, in particular indoxyl sulfate (IS) and p-cresyl sulfate (PCS), may be involved in the pathogenesis of cardiovascular disease. Despite a significant increase in IS and PCS in patients with established kidney damage, the effect of a nephrectomy in non-chronic kidney disease patients is not yet known. METHODS: Forty-two living kidney donors (Caucasian; 76% female [n=32]; 53 ± 10 years) were enrolled in an observational cohort study and followed up annually for 2 years (before nephrectomy, 1 and 2 years after nephrectomy). At each time point, patients underwent measurements of serum total and free IS and PCS (using ultrahigh-performance liquid chromatography), carotid intima-media thickness (a measure of arterial stiffness), brachial artery reactivity (both flow-mediated dilatation and sublingual glycerol trinitrate, markers of endothelial dysfunction), kidney function by Chronic Kidney Disease Epidemiology Collaboration creatinine-cystatin C, and urate and high-sensitivity C-reactive protein using standard laboratory techniques. RESULTS: Kidney function decreased by 30% after nephrectomy (absolute change estimated glomerular filtration rate 28 ± 6.9 and 27 ± 7.6 mL/min/1.73 m at 1 and 2 years, respectively), and the concentration of toxin levels increased by 44% to 100%, which remained elevated at 2 years after nephrectomy (all P<0.001). Both toxins were associated with carotid intima-media thickness, brachial artery reactivity-glycerol trinitrate, serum urate, and C-reactive protein levels (all P<0.03). Further, IS and urate were found to be independent predictors of change in kidney function, from baseline at 2 years after nephrectomy (both P<0.03). CONCLUSION: This study demonstrated significant and sustained increases in nephrovascular toxins, IS and PCS, after nephrectomy. Levels of both toxins were associated with clinically relevant markers of cardiovascular and renal risk, warranting further research in this area.
BACKGROUND: Emerging evidence suggests that uremic toxins, in particular indoxyl sulfate (IS) and p-cresyl sulfate (PCS), may be involved in the pathogenesis of cardiovascular disease. Despite a significant increase in IS and PCS in patients with established kidney damage, the effect of a nephrectomy in non-chronic kidney diseasepatientsis not yet known. METHODS: Forty-two living kidney donors (Caucasian; 76% female [n=32]; 53 ± 10 years) were enrolled in an observational cohort study and followed up annually for 2 years (before nephrectomy, 1 and 2 years after nephrectomy). At each time point, patients underwent measurements of serum total and free IS and PCS (using ultrahigh-performance liquid chromatography), carotid intima-media thickness (a measure of arterial stiffness), brachial artery reactivity (both flow-mediated dilatation and sublingual glycerol trinitrate, markers of endothelial dysfunction), kidney function by Chronic Kidney Disease Epidemiology Collaboration creatinine-cystatin C, and urate and high-sensitivity C-reactive protein using standard laboratory techniques. RESULTS: Kidney function decreased by 30% after nephrectomy (absolute change estimated glomerular filtration rate 28 ± 6.9 and 27 ± 7.6 mL/min/1.73 m at 1 and 2 years, respectively), and the concentration of toxin levels increased by 44% to 100%, which remained elevated at 2 years after nephrectomy (all P<0.001). Both toxins were associated with carotid intima-media thickness, brachial artery reactivity-glycerol trinitrate, serum urate, and C-reactive protein levels (all P<0.03). Further, IS and urate were found to be independent predictors of change in kidney function, from baseline at 2 years after nephrectomy (both P<0.03). CONCLUSION: This study demonstrated significant and sustained increases in nephrovascular toxins, IS and PCS, after nephrectomy. Levels of both toxins were associated with clinically relevant markers of cardiovascular and renal risk, warranting further research in this area.
Authors: Ngan N Lam; Amit X Garg; Dorry L Segev; Mark A Schnitzler; Huiling Xiao; David Axelrod; Daniel C Brennan; Bertram L Kasiske; Janet E Tuttle-Newhall; Krista L Lentine Journal: Am J Nephrol Date: 2015-04-17 Impact factor: 3.754
Authors: Bertram L Kasiske; Teresa Anderson-Haag; Ajay K Israni; Roberto S Kalil; Paul L Kimmel; Edward S Kraus; Rajiv Kumar; Andrew A Posselt; Todd E Pesavento; Hamid Rabb; Michael W Steffes; Jon J Snyder; Matthew R Weir Journal: Am J Kidney Dis Date: 2015-03-17 Impact factor: 8.860
Authors: Anna M Price; Nicola C Edwards; Manvir K Hayer; William E Moody; Richard P Steeds; Charles J Ferro; Jonathan N Townend Journal: J Am Soc Hypertens Date: 2018-05-09