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In the large conduit arteries, elastin is important in maintaining vascular compliance. Studies in animal models suggest that elastin degradation may promote arteriosclerotic vascular changes. There is already a well-established link between aortic stiffening and mortality in the general population and in patients undergoing dialysis. Elastin degradation is mediated by several proteases, including matrix metalloproteinase 2 and cathepsin S. Elastin turnover may be inferred by measuring serum levels of elastin-derived peptides. We analyzed the serum concentration of these biomarkers, their endogenous inhibitors, and aortic pulse wave velocity in 200 patients with stages 3 and 4 chronic kidney disease and then serially in a subgroup of 65 patients over 36 months. Serum matrix metalloproteinase 2, cathepsin S, and elastin-derived peptide levels were independently associated with baseline aortic pulse wave velocity and changes in stiffness over the follow-up period. Higher matrix metalloproteinase 2 and elastin-derived peptide levels were also independently associated with preexisting cardiovascular disease. In multivariable Cox regression, higher serum elastin-derived peptide levels were independently associated with increased all-cause mortality (hazard ratio per SD increase=1.78; P=0.021). In predialysis chronic kidney disease, elastin degradation is an important determinant of arterial stiffness and is associated with all-cause mortality.

Elastin Degradation Is Associated With Progressive Aortic Stiffening and All-Cause Mortality in Predialysis Chronic Kidney Disease