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Background  Sclerostin, an antagonist of the Wingless-type mouse mammary tumor virus integration site (Wnt) pathway that regulates bone metabolism, is a potential contributor of chronic kidney disease (CKD)–mineral and bone disorder (MBD), which has various forms of presentation, from osteoporosis to vascular calcification. The positive association of sclerostin with bone mineral density (BMD) has been demonstrated in CKD and hemodialysis (HD) patients but not in peritoneal dialysis (PD) patients. This study assessed the association between sclerostin and BMD in PD patients.    Methods  Eighty-nine PD patients were enrolled; their sera were collected for measurement of sclerostin and other CKD–MBD-related markers. BMD was also assessed simultaneously. We examined the relationship between sclerostin and each parameter through Spearman correlation analysis and by comparing group data between patients with above- and below-median sclerostin levels. Univariate and multiple logistic regression models were employed to define the most predictive of sclerostin levels in the above-median category.    Results  Bivariate analysis revealed that sclerostin was correlated with spine BMD ( r  = 0.271,  P  = 0.011), spine BMD T-score ( r  = 0.274,  P  = 0.010), spine BMD Z-score ( r  = 0.237,  P  = 0.027), and intact parathyroid hormone (PTH;  r  = − 0.357,  P  < 0.001) after adjustments for age and sex. High BMD, old age, male sex, increased weight and height, diabetes, and high osteocalcin and uric acid levels were observed in patients with high serum sclerostin levels and an inverse relation was noticed between PTH and sclerostin. Univariate logistic regression analysis demonstrated that BMD is positively correlated with above-median sclerostin levels (odds ratio [OR] = 65.61,  P  = 0.002); the correlation was retained even after multivariate adjustment (OR = 121.5,  P  = 0.007).    Conclusions  For the first time, this study demonstrated a positive association between serum sclerostin levels and BMD in the PD population.

Serum sclerostin levels are positively related to bone mineral density in peritoneal dialysis patients: a cross-sectional study