Summary
Highlights
The immune system protects the body, but sometimes it reacts inappropriately, leading to allergic or autoimmune disorders. Immunomodulators are natural or synthetic substances that modify the immune response, either by stimulating or suppressing it. Immunostimulants, like vaccines, enhance immunity, while immunosuppressive agents reduce the immune system's activity to prevent organ rejection or manage autoimmune diseases.
Immunosuppressants are crucial in organ transplantation to prevent the body from destroying foreign tissue. There's a delicate balance required to ensure the body accepts the transplant without making the patient vulnerable to severe infections. These drugs are also vital for treating autoimmune disorders where the immune system mistakenly attacks the body's own healthy cells, such as in multiple sclerosis, rheumatoid arthritis, and lupus.
The video outlines several common autoimmune diseases: Multiple Sclerosis (attacks nerve cells), Rheumatoid Arthritis (attacks joint linings), Lupus (affects various tissues and organs), Type 1 Diabetes Mellitus (destroys insulin-producing cells), Inflammatory Bowel Disease (attacks the intestinal lining, including Crohn's and ulcerative colitis), Psoriasis (overactive T-cells cause skin plaques), Myasthenia Gravis (antibodies bind to nerves, causing muscle weakness), Graves' Disease (stimulates thyroid to overproduce hormones), and Hashimoto's Thyroiditis (attacks the thyroid, leading to hypothyroidism).
Immunosuppressants are categorized into corticosteroids (strong anti-inflammatory drugs like prednisone), cytotoxic/antiproliferative agents (damage or kill cells that reproduce, used in small doses for autoimmune conditions, e.g., methotrexate), and conventional antirejection agents (fungal metabolites with strong immunosuppressive effects like cyclosporine and tacrolimus for organ transplants).
Biologics are newer, more specific immunosuppressive drugs made from biological proteins. They target overactive cells and block specific proteins causing inflammation, offering a more targeted approach than older, less specific immunosuppressants. While effective for many diseases without prior therapies, they are significantly more expensive.
Newer biologic agents include antibody preparations (polyclonal and monoclonal antibodies like basiliximab and daclizumab) and cytokine inhibitors (interleukin-blocking agents like anakinra and TNF-alpha blocking agents like adalimumab, infliximab, and etanercept). These are used for inflammatory autoimmune disorders and transplant rejection but carry an increased risk of serious infections.
All immunosuppressive agents increase the risk of infection and cancer. Patient education is vital and includes frequent handwashing, avoiding infectious people, maintaining a healthy lifestyle, keeping a drug list, reporting adverse effects (like signs of infection or unusual bleeding), regular doctor visits, notifying the doctor of other medications or vaccines, practicing effective contraception, and protecting skin from sunlight.