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Cyclosporine: mechanisms of action and toxicity
1Victor Change Cardiac Research Institute, St. Vincent's Hospital, Sydney, Australia.
Background:
Newer immunosuppressive agents are permitting transplantation to be performed more frequently.
Objectives:
To review the mechanisms of action and toxicity of cyclosporine.
Discussion:
Graft rejection is mainly cell-mediated, although a humoral (antibody) response may also be involved. Cyclosporine and related agents such as FK-506 and rapamycin selectively inhibit adaptive immune responses by blocking T cell-dependent biosynthesis of lymphokines, particularly interleukin 2 at the level of messenger ribonucleic acid (mRNA) transcription. Because cyclosporine is metabolized in the liver by P-450 enzymes, drugs that affect the P-450 system also affect the metabolism of cyclosporine. Hypertension is the most common side effect of cyclosporine. Cyclosporine-induced "nephrotoxicity" may be functional rather than anatomic, caused primarily by preferential constriction of the afferent renal arteriole. Bacterial and fungal infections are less common with regimens of cyclosporine plus prednisone than with azathioprine plus prednisone. Nevertheless, cyclosporine-treated patients are vulnerable to viral infections.
Conclusions:
Although cyclosporine and related compounds represent an improvement over earlier immunosuppressive agents, they produce serious side effects with which the practitioner should be familiar.
Insights
Newer immunosuppressive drugs like cyclosporine improve transplantation success by inhibiting T cell responses. However, practitioners must be aware of potential side effects, including hypertension and increased viral infection risk.
Area of Science:
- Immunology
- Pharmacology
- Transplantation Medicine
Background:
- Advancements in immunosuppressive therapies are increasing the frequency of organ transplantation.
- Cyclosporine and similar agents are crucial in managing post-transplant immune responses.
Purpose of the Study:
- To provide a comprehensive review of the mechanisms of action for cyclosporine.
- To detail the toxicity profile and clinical implications of cyclosporine use.
Main Methods:
- Review of existing literature on cyclosporine's pharmacological properties.
- Analysis of clinical data regarding cyclosporine's efficacy and adverse effects.
Main Results:
- Cyclosporine selectively inhibits T cell activation by blocking lymphokine synthesis, particularly interleukin-2.
- Common side effects include hypertension and functional nephrotoxicity due to renal arteriole constriction.
- While reducing bacterial and fungal infections, cyclosporine increases vulnerability to viral infections.
Conclusions:
- Cyclosporine and related immunosuppressants offer significant advantages over older agents.
- Awareness of cyclosporine's side effect profile is essential for effective clinical management.
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