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The macrophagen in human rapidly progressive glomerulonephritis
Abstract:
Glomeruli from 18 "normal" patients and from 35 patients with glomerulonephritis have been maintained in tissue-culture and examined by time-lapse cinemicroscopy and electron microscopy. At least two distinct cell types with features of epithelial and mesangial cells emerge in the outgrowths from normal and non-crescentic glomeruli. 4 patients with rapidly progressive glomerulonephritis formed a distinct subgroup. Glomerular culture revealed that their crescents contained large numbers of macrophages. This suggests that, contrary to belief, the crescents in rapidly progressive glomerulonephritis consist of accumulated macrophages rather than proliferated epithelial cells.
Insights
In rapidly progressive glomerulonephritis, crescents are primarily macrophages, not epithelial cells. This study used tissue culture to reveal the cellular makeup of these kidney lesions.
Area of Science:
- Nephrology
- Cell Biology
- Pathology
Background:
- Glomerulonephritis is a kidney disease affecting the glomeruli.
- The cellular origin of crescents in rapidly progressive glomerulonephritis (RPGN) is debated.
Purpose of the Study:
- To investigate the cellular composition of glomeruli in normal individuals and patients with glomerulonephritis.
- To determine the cell types forming crescents in rapidly progressive glomerulonephritis.
Main Methods:
- Tissue culture of glomeruli from normal and glomerulonephritis patients.
- Time-lapse cinemicroscopy and electron microscopy for cell analysis.
Main Results:
- Normal and non-crescentic glomeruli cultures showed epithelial and mesangial cells.
- Crescents in rapidly progressive glomerulonephritis cultures were rich in macrophages.
- A distinct subgroup of 4 RPGN patients had crescentic glomeruli composed of macrophages.
Conclusions:
- Contrary to previous beliefs, crescents in rapidly progressive glomerulonephritis are predominantly formed by accumulated macrophages.
- This finding redefines the understanding of crescent formation in RPGN.