Association of copper exposure with prevalence of chronic kidney disease in older adults. Issue 12 (December 2022)

• Record Type: Journal Article
• Authors: Guo, Fanjia; Lin, Yaoyao; Meng, Lin; Peng, Lihe; Zhang, Huafang; Zhang, Xue; Jin, Mingjuan; Wang, Jianbing; Zhang, Yongming; Tang, Mengling; Chen, Kun
• Is Part Of: Clinical nutrition. Volume 41:Issue 12(2022)
• Page Start: 2720
• Page End: 2728
• Publication Date: 2022-12
• Subjects: Copper -- Chronic kidney disease -- Whole blood -- BKMR analysis -- Manganese; CKD chronic kidney disease -- Cu Copper -- Mn manganese -- GBD Global Burden of Disease -- YLL years of life lost -- SCr serum creatinine -- eGFR estimated glomerular filtration rate -- CKD-EPI Chronic Kidney Disease Epidemiology Collaboration -- MDRD Modification of Diet in Renal Disease -- ICP-MS inductively coupled plasma mass spectrometry -- LOD limits of detection -- BMI body mass index -- SD standard deviation -- IQR interquartile range -- OR odds ratio -- CI confidence interval -- MICEs multiple imputation by chained equations -- RCS restricted cubic spline -- BKMR Bayesian kernel machine regression -- PIP posterior inclusion probabilities; Critically ill -- Nutrition -- Periodicals; Diet therapy -- Periodicals; Parenteral feeding -- Periodicals; Enteral feeding -- Periodicals; Enteral Nutrition -- Periodicals; Parenteral Nutrition -- Periodicals; Metabolism -- Periodicals; Diétothérapie -- Périodiques; Alimentation parentérale -- Périodiques; Alimentation entérale -- Périodiques; Nutrition -- Périodiques; Diet therapy; Enteral feeding; Nutrition; Parenteral feeding; Electronic journals; Periodicals; Electronic journals; 615.854
• DOI: 10.1016/j.clnu.2022.10.016
• Languages: English
• ISSNs: 0261-5614

Abstract

Summary: Background & aims: Metal exposure is suspected to be associated with the risk of chronic kidney disease (CKD). Copper (Cu) is an essential yet toxic trace element in humans. Epidemiological evidence on the association of Cu exposure with CKD remains inconsistent. This study aims to investigate the association of blood Cu and its co-exposure to other metals with CKD. Methods: A cross-sectional study was conducted among 3285 older participants in Zhejiang, China. The whole blood levels of Cu as well as other 10 metals were measured using the inductively coupled plasma mass spectrometry (ICP-MS). CKD events were defined as the presence of albuminuria or estimated glomerular filtration rate (eGFR) < 60 mL/min/1.73 m 2 . Multivariable logistic regression and linear regression models were applied to assess the association of Cu with kidney function. The Bayesian kernel machine regression (BKMR) was used to examine the association of metal interactions with CKD. Results: In logistic models, we found a dose-dependent positive association between blood Cu and the prevalence of CKD. Compared to the lowest quartile of blood Cu, the odds ratio (OR) of CKD in the highest quartile was 1.65 (95% confidence interval, CI: 1.25, 2.17), and the β of eGFR was −1.74 (95% CI: −3.15, −0.34) after adjusting for multiple covariates. The positive linear dose–response association was found between blood Cu and the OR of CKD, and negative linear association was found between Cu and the β of eGFR. The positive association between blood Cu and CKD risk was stronger at lower level of manganese (Mn) in the BKMR model. Conclusion: The whole blood level of Cu was remarkably associated with the risk of CKD and showed positive dose–response relationships in the older Chinese population. The toxicity of Cu on kidney function could be antagonized by the exposure of Mn. These findings shed new light on the potential role of Cu in kidney health.