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[Urinary enzymes in the assessment of the early stage of kidney involvement in psoriasis and diabetes mellitus].

The activity of gamma-glutamyl transferase (GGT), alkaline phosphatase (AP), lactate dehydrogenase (LDG), N-acetyl-beta-D-glucosaminidase (NAG) was assessed in 53 patients with psoriasis (PS), 24 PS patients with affected kidneys, 50 patients with type 1 diabetes mellitus(DM). Enhanced activity of the enzymes occurred not only in nephropathy patients but also in those without proteinuria. AP and NAG were more active in PS, while LDG and NAG in DM. Both in PS and DM, NAG activity rose 3-4-fold compared to control. A direct correlation was found between enzymuria and uremia, glycemia (in hyperglycemia only) and cholesterolemia. An inverse relationship existed between enzymuria and uricosuria. The above changes in enzymic activity are attributed to impairment of tubules of the kidney induced by PS and DM. Diagnostic significance of enzymuria as a marker of early tubular involvement is confirmed by investigations of renal biopsies.