Elevated bilirubin levels are associated with a better renal prognosis and ameliorate kidney fibrosisReport as inadecuate




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Background

Bilirubin has been reported to protect against kidney injury. However, further studies highlighting the beneficial effects of bilirubin on renal fibrosis and chronic renal function decline are necessary.

Methods

We assessed a prospective cohort with a reference range of total bilirubin levels. The primary outcome was a 30% reduction in the estimated glomerular filtration rate eGFR from baseline, and the secondary outcome was a doubling of the serum creatinine levels, halving of the eGFR and the initiation of dialysis. In addition, experiments with tubular epithelial cells and C57BL-6 mice were performed to investigate the protective effects of bilirubin on kidney fibrosis.

Results

As a result, 1,080 patients were included in the study cohort. The study group with relative hyperbilirubinemia total bilirubin 0.8–1.2 mg-dL showed a better prognosis in terms of the primary outcome adjusted hazard ratio HR 0.33, 95% confidence interval CI 0.19–0.59, P < 0.001 and the secondary outcome adjusted HR 0.20, 95% CI 0.05 to 0.71, P = 0.01 than that of the control group. Moreover, the bilirubin-treated mice showed less fibrosis in the unilateral ureteral obstruction UUO model P < 0.05. In addition, bilirubin treatment decreased fibronectin expression in tubular epithelial cells in a dose-dependent manner P < 0.05.

Conclusions

Mildly elevated serum bilirubin levels were associated with better renal prognosis, and bilirubin treatment induced a beneficial effect on renal fibrosis. Therefore, bilirubin could be a potential therapeutic target to delay fibrosis-related kidney disease progression.



Author: Sehoon Park , Do Hyoung Kim , Jin Ho Hwang, Yong-Chul Kim, Jin Hyuk Kim, Chun Soo Lim, Yon Su Kim, Seung Hee Yang , Jung Pyo Lee

Source: http://plos.srce.hr/



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