Background: The renoprotective pleiotropic effect of 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors (statins) has recently been reported by several investigators. However, the effect of statins on IgA nephropathy (IgAN) is still unknown.
Methods: We selected 24 IgAN patients who had newly started statin therapy and were not treated with steroids and immunosuppressive agents during the observation period. We analyzed and compared clinical findings 1 year before and after treatment.
Results: Mean age was 50.5 ± 9.91 years and mean blood pressure was 90.9 ± 10.8 mmHg. Renal function was slightly deteriorated, serum creatinine was 1.03 (0.71-1.24) mg/dL and estimated glomerular filtration rate (eGFR) was 55.8 ± 22.8 mL/min. Lipid metabolism was poorly controlled [total cholesterol 247.7 ± 35.7 mg/dL, low-density lipoprotein cholesterol 151.5 (140.8-172.8) mg/dL, and triglyceride 163.0 (126.3-243.8) mg/dL]. Mild urinary abnormality was observed [proteinuria: 0.50 (0.22-1.29) g/g creatinine, urinary red blood cells 1.0 (0.2-5.0) per high power field]. After 1 year of statin treatment, lipid control was significantly better than at baseline. Proteinuria was not significantly decreased but renal function was improved. eGFR changed from a -5.9% decrease to a 2.4% increase (p = 0.0098).
Conclusion: Our results indicated that statins stabilized the renal function of IgAN patients independent of their reduction of proteinuria.