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Cyclosporine A-induced cell cycle arrest and cell death in renal epithelial cells
Kidney International
|October 3, 1999
Abstract:
We studied the effects of cyclosporine A (CsA) on the proliferation of LLC-PK1 proximal tubule epithelial cells. DNA damage was found to be an early event in CsA nephrotoxicity and could be a sensitive indicator of CsA injury in renal epithelial cells. Cell cycle arrest induced by CsA was coincident with elevated p53 levels. It is possible that trans-activating p21 may mediate the halting of the cell cycle through the CsA-induced accumulation of p53.
Insights
Cyclosporine A (CsA) causes DNA damage and cell cycle arrest in kidney cells, potentially mediated by p53 and p21. This damage serves as an early indicator of CsA-induced kidney injury.
Area of Science:
- Nephrology
- Cell Biology
- Toxicology
Background:
- Cyclosporine A (CsA) is an immunosuppressant with known nephrotoxicity.
- Understanding the cellular mechanisms of CsA-induced kidney damage is crucial for patient safety.
Purpose of the Study:
- To investigate the effects of CsA on LLC-PK1 proximal tubule epithelial cell proliferation.
- To identify early cellular events indicative of CsA-induced renal injury.
Main Methods:
- Treatment of LLC-PK1 cells with CsA.
- Assessment of DNA damage.
- Analysis of cell cycle progression.
- Evaluation of p53 and p21 protein levels.
Main Results:
- DNA damage was observed as an early event in CsA-treated cells.
- CsA induced cell cycle arrest.
- Elevated p53 levels were detected, coinciding with cell cycle arrest.
- p21 expression is implicated in mediating CsA-induced cell cycle arrest via p53.
Conclusions:
- DNA damage is a sensitive early marker for CsA nephrotoxicity in renal epithelial cells.
- The p53/p21 pathway likely plays a significant role in mediating CsA-induced cell cycle arrest and kidney injury.