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Clinical Journal of the American Society of Nephrology

Year: 2009  |  Volume: 4  |  Issue: 6  |  Page No.: 1051 - 1056

Hepcidin--A Potential Novel Biomarker for Iron Status in Chronic Kidney Disease

J Zaritsky, B Young, H. J Wang, M Westerman, G Olbina, E Nemeth, T Ganz, S Rivera, A. R Nissenson and I. B. Salusky

Abstract

Background and objectives: Hepcidin is a key regulator of iron homeostasis, but its study in the setting of chronic kidney disease (CKD) has been hampered by the lack of validated serum assays.

Design, setting, participants, & measurements: This study reports the first measurements of bioactive serum hepcidin using a novel competitive ELISA in 48 pediatric (PCKD2–4) and 32 adult (ACKD2–4) patients with stages 2 to 4 CKD along with 26 pediatric patients with stage 5 CKD (PCKD5D) on peritoneal dialysis.

Results: When compared with their respective controls (pediatric median = 25.3 ng/ml, adult = 72.9 ng/ml), hepcidin was significantly increased in PCKD2–4 (127.3 ng/ml), ACKD2–4 (269.9 ng/ml), and PCKD5D (652.4 ng/ml). Multivariate regression analysis was used to assess the relationship between hepcidin and indicators of anemia, iron status, inflammation, and renal function. In PCKD2–4 (R2 = 0.57), only ferritin correlated with hepcidin. In ACKD2–4 (R2 = 0.78), ferritin and soluble transferrin receptor were associated with hepcidin, whereas GFR was inversely correlated. In PCKD5D (R2 = 0.52), percent iron saturation and ferritin were predictors of hepcidin. In a multivariate analysis that incorporated all three groups (R2 = 0.6), hepcidin was predicted by ferritin, C-reactive protein, and whether the patient had stage 5D versus stages 2 to 4 CKD.

Conclusions: These findings suggest that increased hepcidin across the spectrum of CKD may contribute to abnormal iron regulation and erythropoiesis and may be a novel biomarker of iron status and erythropoietin resistance.

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