Glomerular size and structure in diabetes mellitus. II. Late abnormalities

Area of Science:

• Nephrology
• Diabetology
• Pathology

Background:

• Long-term diabetes mellitus is associated with progressive kidney damage.
• Diabetic microangiopathy leads to glomerular lesions and potential kidney dysfunction.

Purpose of the Study:

• To investigate the mechanism behind glomerular enlargement in long-term diabetics.
• To differentiate between compensatory hypertrophy and basement membrane deposition as causes of enlarged glomeruli.

Main Methods:

• Autopsy kidney tissue analysis from diabetic patients and controls.
• Measurement of glomerular volume and lesion severity in randomly selected glomeruli.
• Assessment of solid material deposition and nuclear characteristics within glomeruli.

Main Results:

• Glomeruli in long-term diabetics were nearly double the volume of controls.
• Glomerular enlargement correlated inversely with lesion severity, suggesting hypertrophy.
• Increased nuclei count per glomerulus observed in diabetics, with unchanged nuclear size.
• A high number of occluded glomeruli correlated with diabetes duration and serum creatinine levels.

Conclusions:

• Glomerular enlargement in long-term diabetics is primarily due to compensatory hypertrophy of less affected glomeruli.
• This hypertrophy likely preserves renal function for years despite ongoing microangiopathy.
• Glomerular destruction is compensated by hypertrophy, explaining preserved kidney function in some diabetic patients.