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Background Neutrophil gelatinase-associated lipocalin (NGAL) is not only a bone-derived factor involved in metabolism, but also a biomarker of kidney disease and cardiovascular pathophysiology. We conducted this cross-sectional observational study to explore relationships between plasma NGAL and thoracic aorta calcification (TAC) in maintenance hemodialysis (MHD) patients with and without diabetes. Methods Plasma NGAL was measured by ELISA, TAC was evaluated via computed tomography scan using a 3D quantification method or chest radiography aortic arch calcification score. Spearman correlation, Logistic regression and Partial correlation analysis were used to describe the correlations between NGAL and TAC. Results Plasma NGAL levels were lower in MHD patients with diabetes compared to those without diabetes (49.33(42.37, 55.48) vs 56.78(44.37, 674.13) ng/mL,  P  = 0.026). In MHD patients without diabetes, lg (NGAL) was positively correlated with ARC value( R  = 0.612,  P  = 0.003) analyzed by Spearman correlation; for partial correlation analysis, lg (NGAL) was positively correlated with ARC value, after adjusting for age and sex ( R  = 0.550,  P  = 0.015), adjusting for age, sex and CHD ( R  = 0.565,  P  = 0.015), adjusting for age, sex, CHD and Alb ( R  = 0.536,  P  = 0.027), or adjusting for age, sex, CHD, Alb, and dialyzer membrane (polysulfone) ( R  = 0.590,  P  = 0.016); however, when adjusting for age, sex, CHD, Alb and Ca, the correlation between lg (NGAL) and ARC value disappeared. Positive correlation were found between NGAL and Ca ( R  = 0.644,  P  &lt; 0.001), Ca and ACR ( R  = 0.534,  P  = 0.013) in Spearman coefficient analysis. Conclusion There were positive correlations among plasma NGAL, serum Ca and ARC in MHD patients without diabetes; which suggests that NGAL is possibly a participant in cardiovascular calcification, in non-diabetic MHD.

bmc nephrology

Association of plasma neutrophil gelatinase-associated lipocalin and thoracic aorta calcification in maintenance hemodialysis patients with and without diabetes