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  • Title: High uric acid level is a risk factor for progression of IgA nephropathy with chronic kidney disease stage G3a.
    Author: Moriyama T, Itabashi M, Takei T, Kataoka H, Sato M, Shimizu A, Iwabuchi Y, Nishida M, Uchida K, Nitta K.
    Journal: J Nephrol; 2015 Aug; 28(4):451-6. PubMed ID: 25355499.
    Abstract:
    BACKGROUND: High uric acid level is a known risk factor for deterioration of renal function in chronic kidney disease (CKD), but its influence on the progression of IgA nephropathy (IgAN) remains unclear. METHODS: Adult IgAN patients (n = 611) were classified according to CKD stage. Renal survival rates and clinical and histological findings were compared between patients with high (H-UA) and normal (N-UA) uric acid levels in different CKD stages. RESULTS: The proportion of patients with H-UA increased significantly with increasing CKD stage (stage G1, 12.3%; stage G2, 19.0%; stage G3a, 43.7%; stage G3b-4, 69.0%; P < 0.001). The 30-year renal survival rate was similar in patients with H-UA and N-UA in CKD stages G1, G2, and G3b-4, but was significantly lower in patients with H-UA than with N-UA in CKD stage G3a (24.7 vs. 51.9%; P = 0.0205). The clinical findings were similar in patients with H-UA and N-UA, but the interval from onset to biopsy differed between groups. The proportion of patients with global sclerosis was significantly higher in patients with H-UA than with N-UA in CKD stage G3a (33.3 vs. 11.4%; P = 0.0005), but the Oxford classifications were similar between groups. Multivariate Cox regression analysis identified H-UA (HR 1.36, 95% CI 1.07-1.72, P = 0.011) and a large amount of proteinuria (HR 1.38, 95% CI 1.09-1.74, P = 0.0084) as independent predictors of end-stage renal disease. CONCLUSIONS: H-UA induced global glomerular sclerosis and accelerated the progression of IgAN in CKD stage G3a.
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