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[Mediators involved in the nephrotoxicity of cyclosporin A]
1Service Hospitalo-Universitaire de Pharmacologie, Université de Paris XII, Centre Hospitalier Intercommunal, Créteil, France.
Abstract:
Cyclosporin A-induced nephrotoxicity is a well known adverse effect but its mechanism remains unclear. The understanding of the toxicity mechanism is necessary since the new generation of immunosuppressant drugs (cyclosporin G, FK 506, rapamycin) demonstrates renal toxicity. A renal vasoconstriction occurs with the first administration of cyclosporin and involves several mediators (prostaglandins, renal sympathetic nerves, dopamine. NO, endothelin) which may explain the limited benefit of antagonists. Furthermore, the vasoconstriction explains only haemodynamic modifications and cannot explain histological lesions. New hypotheses involving an alternation of cellular calcium homeostasis suggest alternative investigations to elucidate cyclosporin A nephrotoxicity.
Insights
Cyclosporin A causes kidney damage through unclear mechanisms, potentially involving cellular calcium disruption. Understanding this is crucial for newer immunosuppressants with similar renal toxicity.
Area of Science:
- Nephrology
- Immunology
- Pharmacology
Context:
- Cyclosporin A-induced nephrotoxicity is a recognized clinical issue.
- Newer immunosuppressants like Cyclosporin G, FK 506, and rapamycin also exhibit renal toxicity.
- The precise mechanisms underlying cyclosporin A nephrotoxicity remain incompletely understood.
Purpose:
- To review the current understanding of cyclosporin A nephrotoxicity mechanisms.
- To highlight the limitations of current hypotheses, such as renal vasoconstriction.
- To propose alternative mechanisms, including cellular calcium homeostasis, for further investigation.
Summary:
- Cyclosporin A administration causes renal vasoconstriction mediated by prostaglandins, sympathetic nerves, dopamine, nitric oxide (NO), and endothelin.
- While vasoconstriction explains hemodynamic changes, it does not account for observed histological lesions.
- Emerging hypotheses suggest that alterations in cellular calcium homeostasis may play a significant role in cyclosporin A-induced kidney damage.
Impact:
- Clarifying cyclosporin A nephrotoxicity mechanisms is essential for managing patients on immunosuppressive therapy.
- This knowledge can guide the development of safer immunosuppressant drugs.
- Identifying novel therapeutic targets for preventing or treating drug-induced kidney injury.