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Ultrastructural changes in renal tubules associated with glomerular bleeding
P A Hill1, D J Davies, P Kincaid-Smith
1Department of Anatomy, University of Melbourne, Parkville, Australia.
Kidney International
|December 1, 1989
Summary
Renal tubular epithelial cells can engulf and break down red blood cells, a process similar to macrophages. This finding sheds light on hematuria and acute tubular necrosis in kidney disease.
Area of Science:
- Nephrology
- Renal Pathology
- Cell Biology
Background:
- Hematuria, particularly when glomerular in origin, can indicate significant renal pathology.
- The role of renal tubular cells in processing extravasated erythrocytes is not fully understood.
Purpose of the Study:
- To investigate the interaction between erythrocytes and renal tubular epithelial cells in patients with glomerular hematuria.
- To elucidate the cellular mechanisms involved in erythrocyte processing within renal tubules.
Main Methods:
- Light and electron microscopy were used to examine renal biopsies from ten patients.
- Morphological analysis focused on the presence and fate of erythrocytes within tubular structures.
Main Results:
- Erythrocytes were observed within tubules in all biopsies.
- Four biopsies showed evidence of erythrocyte uptake by tubular epithelial cells (erythrophagocytosis) via electron microscopy.
- Tubular cells exhibited microvilli blunting, vacuolar changes, and increased lysosomes, indicative of cellular stress and phagocytosis.
- The observed erythrocyte destruction pathway within tubular cells mimicked macrophage hemolytic pathways.
Conclusions:
- Renal tubular epithelial cells actively participate in the clearance of erythrocytes in cases of glomerular hematuria.
- Erythrophagocytosis by tubular cells may contribute to acute tubular injury.
- This process highlights a novel role for tubular cells in renal injury and repair mechanisms.