CTSB and diabetes mellitus: Activity of cathepsin B in terms of microgram of DNA in homogenates of glomeruli in the group of untreated diabetic rats was 30.60 ± 9.65 μIU/μg and was lower compared to the group of diabetic rats treated with enalapril and losartan in combination (P = 0.04) and a group of rats diabetes treated with spironolactone (NS) and, respectively, was 51.79 ± 20.37 and 44.88 ± 32.18 μIU/μg.