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KIM-1 expression predicts renal outcomes in IgA nephropathy

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Abstract

Background

Kidney injury molecule-1 (KIM-1) is a sensitive biomarker for proximal tubular injury. Recently, a few studies have shown that urinary KIM-1 has clinical implications in IgA nephropathy (IgAN). We performed this study to determine whether tissue KIM-1 has clinical implications for predicting long-term outcome and whether urinary KIM-1 is correlated with tissue KIM-1 and kidney injury in IgAN patients.

Methods

We assessed the prognostic prediction capability of tissue KIM-1 expression in 69 adult patients with IgAN retrospectively. Renal biopsies from all patients were scored by a pathologist who was blinded to the clinical data for the pathologic variables. The primary outcome was the composite of a 50 % reduction in eGFR or end-stage renal disease. Tissue KIM-1 expression was assessed semiquantitatively by counting the stained tubules per 100× power field; 0 tubule indicates grade 0; 1–5 tubules, grade 1; 6–10 tubules, grade 2; and more than 10 tubules, grade 3. Comparing urinary KIM-1 and tissue KIM-1 expression, 50 consecutive IgAN patients were prospectively enrolled to measure urinary KIM-1 levels and examine their biopsy specimens by KIM-1 immunohistochemistry.

Results

Univariate analysis showed that tissue KIM-1 expression was associated with the renal outcome in IgAN. Multivariate regression analysis, as the relationship of tissue KIM-1 with prognosis, was consistent. Proteinuria at biopsy and tissue KIM-1 grade 3 were shown to have a prognostic value. The concentration of urinary KIM-1/Cr in patients with IgAN was significantly higher than that in the normal controls.

Conclusion

Tissue KIM-1 expression is an independent predictor of adverse renal outcomes in IgA nephropathy patients.

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Correspondence to Dong Cheol Han.

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Kwon, S.H., Park, M.Y., Jeon, J.S. et al. KIM-1 expression predicts renal outcomes in IgA nephropathy. Clin Exp Nephrol 17, 359–364 (2013). https://doi.org/10.1007/s10157-012-0707-2

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  • DOI: https://doi.org/10.1007/s10157-012-0707-2

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