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Calcium oxalate crystal-induced cytolysis in polymorphonuclear leukocytes and erythrocytes
Abstract:
Calcium oxalate microcrystals induce cytolysis of rabbit polymorphonuclear leukocytes (PMN's) and hemolysis of human erythrocytes. The effects on erythrocytes can be distinguished from those on PMN's because cytolysis of the latter is suppressed by substances such as cytochalasin A and N-naphthyl maleimide, known phagocytosis inhibitors. Polyvinylpyridine-N-oxide, a powerful hydrogen acceptor, has no protective effect. Cell injury of PMN's and erythrocytes is potentiated in the presence of cations, whereas poly-D-glutamic acid and other negatively charged compounds have an opposite effect. The results suggest that positive charges on the crystals play an essential role in calcium oxalate-induced cytolysis of PMN's and erythrocytes.
Insights
Calcium oxalate microcrystals harm rabbit white blood cells and human red blood cells. Positive charges on these crystals are key to causing this cell damage.
Area of Science:
- Biochemistry
- Cell Biology
- Toxicology
Background:
- Calcium oxalate microcrystals are implicated in kidney stone formation.
- The precise mechanisms by which these crystals cause cellular damage are not fully understood.
- Previous research suggests potential interactions with immune cells and red blood cells.
Purpose of the Study:
- To investigate the effects of calcium oxalate microcrystals on rabbit polymorphonuclear leukocytes (PMNs) and human erythrocytes.
- To elucidate the role of crystal surface charge in mediating cytolysis and hemolysis.
- To differentiate the cellular injury mechanisms in PMNs and erythrocytes.
Main Methods:
- Exposure of rabbit PMNs and human erythrocytes to calcium oxalate microcrystals.
- Assessment of cytolysis and hemolysis.
- Evaluation of protective effects of phagocytosis inhibitors (cytochalasin A, N-naphthyl maleimide) and a hydrogen acceptor (polyvinylpyridine-N-oxide).
- Investigation of the influence of cations and negatively charged compounds (poly-D-glutamic acid) on cell injury.
Main Results:
- Calcium oxalate microcrystals induced cytolysis of PMNs and hemolysis of erythrocytes.
- Phagocytosis inhibitors suppressed PMN cytolysis but not erythrocyte hemolysis.
- Cations potentiated cell injury, while negatively charged compounds attenuated it.
- Polyvinylpyridine-N-oxide did not offer protection.
Conclusions:
- Positive charges on calcium oxalate microcrystals are crucial for inducing cell damage in both PMNs and erythrocytes.
- The mechanisms of injury differ between PMNs and erythrocytes, with phagocytosis playing a role in PMN damage.
- Surface charge interactions are a significant factor in the pathogenesis of calcium oxalate-induced cellular toxicity.