Drugs Influencing Immune Function

Immunosuppressants

Immunosuppressants are drugs that reduce or inhibit the immune system's activity. They are widely used in managing autoimmune diseases and in preventing organ transplant rejection. Action mechanisms of immunosuppressants include:

• T-cell inhibition: Drugs like cyclosporine and tacrolimus block the activation of T-cells by inhibiting calcineurin, a critical signaling molecule.
• Inhibition of DNA synthesis: Azathioprine and mycophenolate mofetil prevent the proliferation of immune cells by interfering with nucleic acid production.
• Anti-inflammatory actions: Corticosteroids such as prednisone reduce the production of inflammatory cytokines and immune mediators.

Immunosuppressants can be used in:

• Organ transplantation (kidney, liver, heart)
• Autoimmune disorders (rheumatoid arthritis, lupus, multiple sclerosis)
• Inflammatory diseases (inflammatory bowel disease, psoriasis)

Immunostimulants

Immunostimulants are drugs that activate or enhance the immune response. They are critical in treating cancers, viral infections, and for vaccine development. Action mechanisms of immunostimulants include:

• Cytokine therapy: Agents like interleukin-2 (IL-2) and interferons stimulate immune cell activity, especially T-cells and natural killer (NK) cells.
• Checkpoint inhibitors: Monoclonal antibodies such as nivolumab and pembrolizumab block immune checkpoints (e.g., PD-1, CTLA-4), allowing T-cells to attack tumors more effectively.
• Pattern recognition receptor agonists: Compounds that mimic microbial molecules to activate innate immune pathways (e.g., Toll-like receptor agonists).

Immunostimulants can be used in:

• Cancer immunotherapy
• Chronic viral infections (e.g., hepatitis B and C)
• Vaccine enhancement
• Immunodeficiency syndromes

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