Diabetologia

, Volume 41, Issue 9, pp 1047–1056

Kidney morphological changes in relation to long-term renal function and metabolic control in adolescents with IDDM

Authors

  • U. B. Berg
    • Department of Pediatrics, Karolinska Institute, Huddinge University Hospital, Huddinge, Sweden
  • T. B. Torbjörnsdotter
    • Department of Pediatrics, Karolinska Institute, Huddinge University Hospital, Huddinge, Sweden
  • G. Jaremko
    • Department of Pathology, Karolinska Institute, Huddinge University Hospital, Huddinge, Sweden
  • B. Thalme
    • Department of Pediatrics, Karolinska Institute, Huddinge University Hospital, Huddinge, Sweden
Originals

DOI: 10.1007/s001250051029

Cite this article as:
Berg, U., Torbjörnsdotter, T., Jaremko, G. et al. Diabetologia (1998) 41: 1047. doi:10.1007/s001250051029

Summary

For the past 10–15 years all the children at our unit with insulin-dependent diabetes mellitus have been repeatedly followed-up with renal function tests. Renal biopsy, examined by light and electron microscopy, was included in the follow-up of 36 adolescents and young adults, aged 13–25 years, with a disease duration of 7–19 years. All subjects had undergone at least three renal function tests before biopsy and none had persistent microalbuminuria. Renal function was evaluated as glomerular filtration rate and effective renal plasma flow determined by clearances of inulin and para-amino hippuric acid. Glomerular filtration rate and filtration fraction were increased before and at the time of the biopsy. Glomerular basement membrane thickness (331–858 nm) and mesangial matrix volume fraction (7.4–17.1 %) were increased. Long-term hyperfiltration and hyperperfusion before biopsy correlated inversely with mean glomerular volume. Increased filtration fraction before the biopsy correlated directly with mean of all HbA1c (r = 0.485, p < 0.01) and both variables correlated directly with mesangial matrix volume fraction, basement membrane thickness and structural index (r = 0.433, p < 0.01 and r = 0.626, p < 0.001, respectively). Urinary albumin excretion rate correlated directly with foot process width (r = 0.645, p < 0.001). By multiple regression analysis the most important variable for the increase in basal membrane thickness was the metabolic control while the mean of previous filtration fraction was most important for the increase in mesangial matrix volume. In conclusion, although none of the patients showed constant microalbuminuria, early diabetic structural changes were evident with basal membrane thickening and increased mesangial matrix volume. The structural changes related to long-standing hyperfiltration and poor metabolic control. [Diabetologia (1998) 41: 1047–1056]

Keywords Kidney biopsy insulin-dependent diabetes mellitus kidney function tests adolescents glomerular filtration rate diabetic nephropathy kidney morphology.

Copyright information

© Springer-Verlag Berlin Heidelberg 1998