Related Experiment Video
Updated: Aug 7, 2026
Endothelialized Microfluidics for Studying Microvascular Interactions in Hematologic Diseases
Published on: June 22, 2012
Mesangial involvement in hemolytic-uremic syndrome. A light and electron microscopic study
Abstract:
Electron microscopic analysis of the mesangial injury in the hemolytic-uremic syndrome was performed in 10 patients. Proteinaceous material similar to that found in the subendothelial region was also seen focally in the mesangium altering the matrix and imparting a reticular appearance. This degenerative process was associated with reparative changes in the glomerular tuft. Many of the mesangial cells were hypertrophied and demonstrated phagocytic activity and peripheral extension of their cytoplasmic processes. Mitotic figures in endothelial as well as mesangial cells were regarded as evidence of a reparative process. Severe mesangial insudation of material containing fibrinogen derivatives resulted in segmental tuft necrosis with almost complete replacement and destruction of the mesangial matrix. On some occasions, a break of the glomerular basement membrane was accompanied by the escape of intraluminal contents into the urinary space, leading to crescentic epithelial cell proliferation.
Insights
Hemolytic-uremic syndrome causes mesangial injury with protein deposits and cell changes. Electron microscopy reveals degenerative and reparative processes in the glomerulus, including cell proliferation and matrix destruction.
Area of Science:
- Nephrology
- Pathology
- Electron Microscopy
Background:
- Hemolytic-uremic syndrome (HUS) is a serious condition characterized by kidney damage.
- Mesangial injury is a key feature of HUS pathology.
- Understanding the ultrastructural changes in the mesangium is crucial for HUS pathogenesis.
Purpose of the Study:
- To investigate the electron microscopic features of mesangial injury in patients with hemolytic-uremic syndrome.
- To characterize the degenerative and reparative changes occurring in the glomerular tuft during HUS.
Main Methods:
- Electron microscopic analysis was performed on renal biopsies from 10 patients diagnosed with hemolytic-uremic syndrome.
- Detailed examination of mesangial matrix, mesangial cells, endothelial cells, and glomerular basement membranes.
Main Results:
- Proteinaceous material deposition was observed in the mesangium, altering the matrix and creating a reticular appearance.
- Mesangial cells showed hypertrophy, phagocytic activity, and cytoplasmic extensions, indicative of a reparative response.
- Severe insudation of fibrinogen derivatives led to segmental glomerular necrosis and mesangial matrix destruction.
- Breaks in the glomerular basement membrane resulted in crescent formation due to epithelial cell proliferation.
Conclusions:
- Electron microscopy reveals complex degenerative and reparative processes in the mesangium during hemolytic-uremic syndrome.
- Mesangial cell hypertrophy, phagocytosis, and proliferation, alongside matrix alteration and necrosis, are characteristic findings.
- Glomerular basement membrane damage and subsequent crescent formation highlight the severity of injury in HUS.
