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Diabetes, Vol 37, Issue 1 38-43, Copyright © 1988 by American Diabetes Association

ARTICLES

Glomerular morphology by light microscopy in non-insulin-dependent diabetes mellitus. Lack of glomerular hypertrophy

A Schmitz, HJ Gundersen and R Osterby
Second University Clinic of Internal Medicine, Kommunehospitalet, Aarhus, Denmark.

We quantitated glomerular structure by light microscopy in 19 subjects with non-insulin-dependent diabetes mellitus (NIDDM) and studied the possible connection between morphology and urinary albumin concentration. Autopsy material was collected retrospectively from diabetic subjects in whom urinary albumin concentration had been measured within 1.5 yr. Nineteen consecutive sex- and age-matched nondiabetic subjects were controls. A quantitative study of a random sample of glomeruli was performed blindly on periodic acid-Schiff (PAS)-stained sections. The main parameters obtained were 1) mean volume of open glomeruli, 2) frequency of glomerular occlusion, and 3) volume fraction of red-stained material (PAS-positive substance) in open glomeruli [Vv(R/G)]. There was no increase in glomerular volume in these NIDDM subjects, contrary to the glomerular hypertrophy found early as well as late in insulin-dependent diabetes mellitus. An increase in Vv(R/G) was found in diabetic subjects, demonstrating the presence of glomerulopathy as it is diagnosed by light microscopy. The frequency of glomerular occlusion was not significantly different between the groups. A high urinary albumin concentration did not necessarily reflect more advanced glomerulopathy.
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