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Glomerular Structure and Function in Type 2 Diabetes Stratified by Glomerular Basement Membrane Thickening.
Amy K Mottl1, Elif I Ekinci2,3,4, John M Basgen5
1University of North Carolina Kidney Center, UNC School of Medicine; Chapel Hill, NC, USA.
Glomerular Diseases
|July 14, 2026
Summary
Glomerular basement membrane thickening in type 2 diabetes is linked to poorer kidney function decline. Stratifying patients by GBM thickness may improve prognostication and therapeutic strategies for diabetic kidney disease.
Area of Science:
- Nephrology
- Diabetology
- Pathology
Background:
- Diabetic kidney disease (DKD) is a major complication of type 2 diabetes (T2D).
- Understanding the structural basis of DKD is crucial for prognostication and treatment.
- Glomerular basement membrane (GBM) thickness is a key structural parameter in DKD.
Purpose of the Study:
- To investigate the relationship between GBM thickness and kidney function in T2D patients.
- To explore structural-functional correlations stratified by GBM thickness.
- To identify potential structural phenotypes for DKD prognostication.
Main Methods:
- Kidney biopsies from 30 T2D patients with moderate/severe albuminuria, low eGFR, or retinopathy were analyzed.
- Stereologic analyses were performed, stratifying participants by GBM thickness.
- Light microscopy assessed glomerular, vascular, and tubulointerstitial lesions; eGFR slope was calculated.
Main Results:
- GBM thickening was observed in 21 of 30 participants.
- The GBM-thickened group had higher HbA1c and albuminuria prevalence.
- In the GBM-thickened group, mesangial volume, mesangial matrix, and podocyte foot process width correlated with eGFR slope.
Conclusions:
- GBM thickness is a relevant structural parameter in T2D-related kidney disease.
- Stratification by GBM thickness may reveal specific structural-functional relationships.
- Further research is needed to categorize renal structural phenotypes for improved DKD management.
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