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Assessment of Kidney Function in Mouse Models of Glomerular Disease
09:16

Assessment of Kidney Function in Mouse Models of Glomerular Disease

Published on: June 30, 2018

Diagnostic and prognostic significance of proteinuria selectivity index in glomerular diseases

J Tencer1, O Bakoush, O Torffvit

  • 1Department of Nephrology, Lund University Hospital, S-221 85, Lund, Sweden. jan.tencer@njur.lu.se

Clinica Chimica Acta; International Journal of Clinical Chemistry
|June 8, 2000
PubMed

Insights

The proteinuria selectivity index (SI) helps diagnose glomerular diseases and predict kidney function decline. High SI values indicate poorer prognosis, with high-molecular-weight protein excretion being a key indicator.

Area of Science:

  • Nephrology
  • Pathophysiology
  • Diagnostic Markers

Background:

  • Glomerular permeability to macromolecules is crucial in kidney disease.
  • The proteinuria selectivity index (SI) quantifies this permeability.
  • Understanding SI's role can improve diagnosis and prognosis in glomerular diseases.

Purpose of the Study:

  • To evaluate the diagnostic and prognostic utility of the proteinuria selectivity index (SI) in glomerular diseases.
  • To compare the effectiveness of SI derived from alpha(2)-macroglobulin (alpha(2)-M-SI), IgM (IgM-SI), and IgG (IgG-SI).

Main Methods:

  • Analyzed SI in 199 patients for diagnosis and 49 patients for prognosis.
  • Calculated SI using alpha(2)-macroglobulin, IgM, and IgG.
  • Correlated SI levels with creatinine clearance (Cr cl) decline over a 46-month follow-up.

Main Results:

  • Low SI values differentiated minimal change nephropathy; high SI values indicated crescentic glomerulonephritis.
  • High IgG-SI and IgM-SI correlated with significant decreases in creatinine clearance.
  • Decline in Cr cl correlated with SI levels, not albuminuria, highlighting high-molecular-weight protein excretion as a prognostic factor.

Conclusions:

  • Proteinuria selectivity index (SI) serves as a valuable diagnostic aid in proteinuric glomerulopathies.
  • Urinary excretion of high-molecular-weight proteins, assessed by SI, is a potential prognostic marker for kidney function decline.

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