Abstract
Soluble urokinase plasminogen activator receptor (suPAR) is associated with faster decline in kidney function and the pathogenesis of diabetic nephropathy. However, little is known about the impact of treatment on plasma and urinary levels of suPAR. We aimed to investigate the impact of renin angiotensin system (RAS) single and dual blockade on suPAR levels in patients with type 2 diabetes and albuminuria. We conducted a post-hoc analysis of a randomized controlled crossover trial. Urine and plasma samples were analyzed for suPAR levels. The placebo period was considered reference and all treatment periods were compared to placebo. Patients (n = 22) were treated for 2-month periods with either placebo, irbesartan 300 mg once daily, aliskiren 300 mg once daily or irbesartan/aliskiren combination in random order. Placebo geometric mean plasma (SEM) levels of suPAR were 3.3 ng/mL (1.1) and urine levels were 4.0 ng/mL (1.1). None of the treatments had significant effects on plasma levels of suPAR compared to placebo. Compared to placebo, irbesartan and combination treatment decreased urinary levels of suPAR significantly (−1.3 ng/mL), while aliskiren did not. In patients with type 2 diabetes urinary levels of suPAR were reduced during RAS blockade treatment, which may contribute to renoprotection.
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