Glomerular number and size: facts and artefacts

Area of Science:

• Nephrology
• Pathology
• Stereology

Background:

• Glomerular filter size is crucial for normal kidney structure and function.
• Deviations in glomerular size are associated with the onset and progression of glomerular disease.
• A hypothesis suggests individuals with minor glomerular size variations may be more susceptible to kidney disease.

Purpose of the Study:

• To review clinical and experimental data on glomerular number and size.
• To critically discuss stereological methods for estimating glomerular parameters.
• To explore the potential of stereology in identifying at-risk populations for glomerular disease.

Main Methods:

• Review of clinical and experimental data concerning glomerular number and size.
• Critical evaluation of stereological techniques, including the fractionator and dissector.
• Discussion of challenges in establishing standardized protocols for tissue acquisition and processing.

Main Results:

• Evidence links glomerular filter size to the inception and development of glomerular disease.
• Stereological methods can estimate glomerular number and mean size.
• No universal standards for glomerular number and size have been agreed upon due to methodological challenges.

Conclusions:

• Standardized stereological assessment of glomerular number and size could aid in diagnosing and predicting glomerular disease.
• Identifying at-risk individuals through biopsy specimens is a potential application if the hypothesis of susceptibility is confirmed.
• Overcoming challenges in standardization promises advances in understanding glomerular disease morphogenesis and improving renal biopsy utility.