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Early mesangiolysis and monocyte influx observed in diabetic glomerulosclerosis: relation to nodule formation
1Department of Medicine (II), Niigata University School of Medicine, Japan.
Abstract:
Lytic changes to the mesangium and subendothelial area in diabetic glomerulosclerosis were studied by electron microscopy with an emphasis on the mechanism of nodule formation. Renal biopsy specimens were obtained from 30 diabetics (11 males, 19 females; 27 NIDDM, 3 IDDM; mean age, 52.2 years) with renal involvement. Evaluations were made of the glomerular lesions, particularly the ultra-structural findings contributing to nodule formation, mainly by electron microscopy. Varying degrees of lytic change, such as a loose and edematous mesangial matrix, widening of the subendothelial space, followed by endothelial detachment, and destruction of anchor points, were observed in close association with progression of the diffuse lesions. Plasma proteins were found to infiltrate into the widened subendothelial space. Mesangial cells also protruded into the same space and encroached around the whole capillary wall. The interposed mesangial cells were occasionally separated from the basement membrane. Monocytes identified from their ultrastructure were frequently present noticed in the lytic areas, suggesting a reaction to lytic changes. These processes may occur repeatedly with direct expansion of the mesangial matrix, subsequently revealing a nodular appearance.
Insights
Diabetic glomerulosclerosis involves lytic changes in the mesangium and subendothelial space, leading to nodule formation. Electron microscopy revealed plasma protein infiltration and mesangial cell protrusion contributing to these kidney lesions.
Area of Science:
- Nephrology
- Pathology
- Diabetic Nephropathy
Background:
- Diabetic glomerulosclerosis is a major cause of kidney failure in diabetics.
- Understanding the ultra-structural changes is crucial for elucidating disease mechanisms.
Purpose of the Study:
- To investigate the lytic changes in the mesangium and subendothelial area in diabetic glomerulosclerosis.
- To elucidate the mechanism of nodule formation in diabetic kidney disease.
Main Methods:
- Electron microscopy was used to examine renal biopsy specimens from 30 diabetic patients.
- Glomerular lesions were evaluated, focusing on ultra-structural findings related to nodule formation.
Main Results:
- Lytic changes, including mesangial matrix edema and subendothelial space widening, were observed.
- Plasma protein infiltration, mesangial cell protrusion, and monocyte presence were noted in lytic areas.
- These processes appear to contribute to the progressive expansion of the mesangial matrix and nodule formation.
Conclusions:
- The study highlights the role of lytic changes and associated cellular and matrix events in the pathogenesis of nodular diabetic glomerulosclerosis.
- These findings provide insights into the ultra-structural basis of diabetic kidney disease progression.