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Ultrastructure of experimental xanthogranulomatous pyelonephritis
Virchows Archiv. B, Cell Pathology
|March 9, 1976
Summary
This study examines xanthogranulomas in rats with obstructive pyelonephritis, revealing macrophages engulfing bacteria and neutrophils. The origin of lipid droplets within these macrophages remains unclear, suggesting potential intracellular synthesis.
Area of Science:
- Pathology
- Microbiology
- Cell Biology
Background:
- Obstructive suppurative pyelonephritis can lead to the formation of xanthogranulomas.
- Understanding the cellular mechanisms within these inflammatory lesions is crucial.
Purpose of the Study:
- To investigate the ultrastructure of xanthogranulomas in a rat model of obstructive pyelonephritis.
- To elucidate the cellular composition and lipid dynamics within these lesions.
Main Methods:
- Induction of obstructive pyelonephritis in rats via ureter ligation and E. coli injection.
- Ultrastructural analysis of xanthogranuloma tissues using electron microscopy.
- Identification and characterization of cellular components and phagolysosomal contents.
Main Results:
- Xanthogranulomas comprised macrophages containing phagolysosomes with bacterial and polymorphonuclear leukocyte remnants.
- Triglyceride-rich lipid droplets were observed within macrophages, both as discrete droplets and within phagolysosomes.
- The origin of these intracellular lipid droplets in macrophages was not definitively determined, with intracellular synthesis being a possibility.
- Older macrophages at the lesion periphery were largely devoid of lipid droplets.
Conclusions:
- Macrophages play a key role in clearing bacteria and cellular debris during obstructive pyelonephritis.
- The presence and origin of lipids within macrophages in xanthogranulomas warrant further investigation.
- Cellular aging may influence lipid accumulation within macrophages in inflammatory conditions.