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Kidney pathology in liver allograft recipients after long-term treatment with cyclosporin A
F E Dische1, J Neuberger, J Keating
1Department of Histopathology, King's College Hospital, London.
Abstract:
Organ transplant recipients given immunosuppressive treatment with cyclosporin A are at risk of injury due to nephrotoxicity. Eight liver allografted patients whose renal function became impaired during therapy with cyclosporin A for up to 4.5 years were investigated by renal biopsy. Ischemic changes in glomeruli were found to be greater than in controls, and there was focal tubular atrophy, but an excess of lesions in small arteries could not be demonstrated. In one patient there were glomerular changes suggestive of thrombotic microangiopathy. Interstitial fibrosis and cellular infiltration were slight. The pathogenesis of the ischemia remains to be elucidated, but reasons are advanced for favoring the view that the mechanism of cyclosporin A nephrotoxicity is primarily vasomotor, causing a reduction of renal blood flow and glomerular filtration rate without permanent organic arterial narrowing; nephrons become damaged irreversibly nevertheless.
Insights
Cyclosporin A can cause kidney damage in organ transplant patients. This study suggests the nephrotoxicity is mainly due to blood vessel constriction, leading to reduced kidney function and irreversible damage.
Area of Science:
- Nephrology
- Immunology
- Transplantation
Background:
- Organ transplant recipients often require immunosuppressants like cyclosporin A.
- Cyclosporin A is associated with nephrotoxicity, potentially impairing kidney function.
- Long-term effects of cyclosporin A on renal health require further investigation.
Purpose of the Study:
- To investigate the renal pathology in liver transplant patients experiencing impaired kidney function during cyclosporin A therapy.
- To elucidate the mechanisms underlying cyclosporin A-induced nephrotoxicity.
Main Methods:
- Renal biopsy analysis in eight liver allograft recipients with impaired renal function.
- Histopathological examination of kidney tissue, comparing with controls.
- Assessment of glomerular, tubular, and vascular lesions.
Main Results:
- Increased ischemic changes in glomeruli compared to controls.
- Focal tubular atrophy observed.
- No excess of small arterial lesions, but one case showed thrombotic microangiopathy.
- Minimal interstitial fibrosis and cellular infiltration.
Conclusions:
- Cyclosporin A nephrotoxicity may primarily involve vasomotor dysfunction, reducing renal blood flow and glomerular filtration rate.
- This leads to irreversible nephron damage despite the absence of permanent arterial narrowing.
- The exact pathogenesis of cyclosporin A-induced ischemia warrants further research.