Abstract:
:N-acetylglucosaminidase (NAG) is a lysosomal enzyme produced by renal proximal tubular cells and has been widely used as a marker, which indicates a degree of renal tubular damage. An increase in urinary NAG excretion is though to result from the renal tubular damage. The aim of this study was to evaluate whether even mild hyperglycemia causes an increase in urinary excretion of NAG, which is a renal tubular protein. We examined urinary NAG excretion in overnight urine in 22 Japanese men with impaired glucose tolerance (IGT) for more than two years (IGT group) and 41 healthy control subjects matched in age, gender, BMI and blood pressure (control group). Urinary NAG excretion levels of IGT group and control group were 2.89 (1.23-7.97) and 2.22 (0.60-4.93) U/g creatinine, median (range), respectively. The IGT group showed significantly higher urinary excretion of NAG compared to the control group (p < 0.01). Several studies have indicated that plasma proteins filtered through the glomerular capillary may have intrinsic renal toxicity. Recently, we have reported that urinary excretion of plasma proteins (ceruloplasmin, IgG4 and IgG) with molecular radii of approximately 45-55 A is increased in subjects with IGT compared to healthy control subjects with normal glucose tolerance. Considering the present result together with our recent finding, we suggest that increased urinary excretion of NAG in the mildly hyperglycemic subjects may be due to the adverse effects of the plasma proteins highly filtered through the glomerular capillary on tubular cells.
journal_name
Ren Failjournal_title
Renal failureauthors
Fujita H,Narita T,Morii T,Shimotomai T,Yoshioka N,Kakei M,Ito Sdoi
10.1081/jdi-120002662subject
Has Abstractpub_date
2002-01-01 00:00:00pages
69-75issue
1eissn
0886-022Xissn
1525-6049journal_volume
24pub_type
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