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A comparative study of human glomerular basement membrane thickness using direct measurement and orthogonal intercept
Débora Leal Viana1, Dona Jeanne Alladagbin1, Washington L C Dos-Santos2,3
1Oswaldo Cruz Foundation, Gonçalo Moniz Institute, Rua Waldemar Falcão 121, Candeal, Salvador, BA, CEP 40.295-710, Brazil.
BMC Nephrology
|January 11, 2022
Summary
Glomerular basement membrane (GBM) thickness in Brazilians averages 290 nm. Correcting direct measurement (DM) for non-perpendicular sections aligns results with orthogonal interception methods (OIM), improving accuracy.
Area of Science:
- Nephrology
- Histology
- Biomedical Engineering
Background:
- Glomerular basement membrane (GBM) thickness is a key indicator in kidney disease diagnosis.
- Estimating GBM thickness can vary between laboratories and methodologies.
Purpose of the Study:
- To estimate glomerular basement membrane (GBM) thickness in the Brazilian population.
- To compare direct measurement (DM) and orthogonal interception methods (OIM) for GBM thickness estimation.
- To identify factors influencing GBM thickness measurements.
Main Methods:
- Kidney biopsies from 38 Brazilian patients were analyzed using conventional, immunofluorescence, and electron microscopy.
- Glomerular basement membrane (GBM) thickness was measured using both direct measurement (DM) and orthogonal interception methods (OIM).
- A correction factor for non-perpendicular membrane sectioning was applied to DM estimates.
Main Results:
- Direct measurement (DM) initially yielded higher GBM thickness estimates than orthogonal interception methods (OIM).
- After applying a correction for non-perpendicular sectioning, DM estimates closely matched OIM results (289 ± 44 nm vs. 287 ± 48 nm).
- No statistically significant differences in GBM thickness were found based on patient age or sex.
Conclusions:
- The average glomerular basement membrane (GBM) thickness in the Brazilian population is approximately 290 nm.
- Applying correction criteria for non-perpendicular sectioning enhances the accuracy of GBM thickness estimates obtained by both DM and OIM.
- Standardized measurement techniques are crucial for reliable GBM thickness assessment across different laboratories.
