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Head-to-head comparison of oxidative stress biomarkers for all-cause mortality in hemodialysis patients

Oxidative stress (OS) presents even in the early chronic kidney disease (CKD) stage and is exacerbated in patients with end-stage renal disease (ESRD) undergoing maintenance hemodialysis (MHD). There is still a debate over the association between oxidative stress and mortality. Our study aims to com...

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Main Authors: Zuo, Jiao (Author) , Chaykovska, Lyubov (Author) , Chu, Chang (Author) , Chen, Xin (Author) , Hasan, Ahmed A. (Author) , Krämer, Bernhard (Author) , Tepel, Martin (Author) , Hocher, Berthold (Author)
Format: Article (Journal)
Language:English
Published: 2 October 2022
In: Antioxidants
Year: 2022, Volume: 11, Issue: 10, Pages: 1-12
ISSN:2076-3921
DOI:10.3390/antiox11101975
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.3390/antiox11101975
Verlag, kostenfrei, Volltext: https://www.mdpi.com/2076-3921/11/10/1975
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Author Notes:Jiao Zuo, Lyubov Chaykovska, Chang Chu, Xin Chen, Ahmed A. Hasan, Bernhard K. Krämer, Martin Tepel and Berthold Hocher

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520 |a Oxidative stress (OS) presents even in the early chronic kidney disease (CKD) stage and is exacerbated in patients with end-stage renal disease (ESRD) undergoing maintenance hemodialysis (MHD). There is still a debate over the association between oxidative stress and mortality. Our study aims to compare head-to-head the prognostic value of different oxidative markers for all-cause mortality in hemodialysis (HD) patients. We thus enrolled 347 patients on HD in this prospective study. Four OS biomarkers were measured (carbonyl proteins, myeloperoxidase (MPO), advanced oxidation protein products (AOPPs), and oxidized low-density lipoprotein (ox-LDL)). During the 60-month follow-up period, 9 patients have been lost to follow-up and 168 (48.4%) patients died. Concerning the oxidative stress (ox-stress) byproducts, carbonyl proteins were lower in survivors (105.40 ng/mL (IQR 81.30-147.85) versus 129.65 ng/mL (IQR 93.20-180.33); p < 0.001), with similar results for male patients (103.70 ng/mL (IQR 76.90-153.33) versus 134.55 ng/mL (IQR 93.95-178.68); p = 0.0014). However, there are no significant differences in MPO, AOPP, and ox-LDL between the two groups. Kaplan-Meier survival analysis indicated that patients in the higher carbonyl proteins concentration (>117.85 ng/mL group) had a significantly lower survival rate (log-rank test, p < 0.001). Univariate Cox regression analysis showed a positive correlation between carbonyl proteins and all-cause mortality in the higher and lower halves. Even after adjustment for conventional risk factors, it remained a statistically significant predictor of an increased risk of death in MHD. Univariate Cox regression analysis of MPO showed that continuous MPO and Log MPO were significantly associated with all-cause mortality, except for binary MPO (divided according to the median of MPO). Multivariate Cox analysis for MPO showed that the mortality prediction remains significant after adjusting for multiple factors. In conclusion, not all ox-stress biomarkers predict all-cause mortality in HD patients to a similar extent. In the present study, carbonyl proteins and MPO are independent predictors of all-cause mortality in HD patients, whereas AOPPs and oxLDL are clearly not associated with all-cause mortality in HD patients. 
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