Immunosuppression with cyclosporin A: a review

Area of Science:

• Immunology
• Pharmacology

Background:

• Cyclosporin A (CS-A) is a fungal metabolite with potent immunosuppressive properties.
• It exhibits narrow-spectrum antibiotic activity but significantly impacts immune responses, including T-cell mediated reactions.

Purpose of the Study:

• To elucidate the mechanism of action and immune effects of Cyclosporin A.
• To assess its potential in transplantation and its clinical implications.

Main Methods:

• The study reviews existing evidence on CS-A's interaction with lymphocytes and its effects on cellular processes.
• Investigates its affinity for membrane lipids and interference with RNA and DNA synthesis.
• Examines its impact on T-cell and B-cell populations and its lack of cytotoxic or anti-mitotic activity on other cell types.

Main Results:

• CS-A specifically targets lymphocytes, particularly T-cells, interfering with their transition to the blast cell state and responsiveness to growth factors.
• It demonstrates broad immunosuppressive potency, protecting allografts and xenografts in various species.
• Clinical applications show promise but are associated with increased risks of lymphomas and infections when combined with other immunosuppressants.

Conclusions:

• Cyclosporin A represents a new class of suppressive agents with significant immunosuppressive capabilities.
• Its mechanism involves attenuating lymphocyte clones rather than deletion, with potential for recovery.
• Clinical use requires cautious optimism due to associated risks, necessitating careful monitoring.