Immunosuppression – Causes, Risks and Treatment
Immunosuppression refers to the deliberate or disease-caused reduction of immune system activity. It is used, for example, after organ transplants or to treat autoimmune diseases.
Things worth knowing about "Immunosuppression"
Immunosuppression refers to the deliberate or disease-caused reduction of immune system activity. It is used, for example, after organ transplants or to treat autoimmune diseases.
What is Immunosuppression?
Immunosuppression refers to the weakening or complete suppression of the body's immune defenses. It can be intentionally induced for medical purposes – such as preventing organ rejection after a transplant – or it can occur as a consequence of certain diseases or medications. A suppressed immune system is more vulnerable to infections, as the body can no longer adequately fight off pathogens.
Causes of Immunosuppression
The causes can be divided into two main categories:
Drug-Induced Immunosuppression
- Immunosuppressive drugs such as corticosteroids, ciclosporin, tacrolimus, or mycophenolate mofetil are used following organ transplantation
- Chemotherapy agents for cancer treatment can significantly weaken the immune system
- Long-term corticosteroid therapy for inflammatory conditions
- Biologics (e.g., TNF inhibitors) used in autoimmune diseases such as rheumatoid arthritis
Disease-Induced Immunosuppression
- HIV/AIDS: The human immunodeficiency virus specifically destroys T-helper cells, leading to severe immune deficiency
- Blood cancers (e.g., leukemia, lymphoma) impair the production of immune cells
- Congenital immune defects (primary immunodeficiencies)
- Severe malnutrition or chronic diseases such as diabetes mellitus
- Radiation therapy
Symptoms and Consequences
A weakened immune system often manifests through:
- Frequent, unusually severe, or prolonged infections (e.g., fungal infections, opportunistic infections)
- Slow wound healing
- Recurring bacterial or viral illnesses
- General fatigue and exhaustion
Particularly concerning are so-called opportunistic infections – diseases that rarely affect people with a healthy immune system but can become life-threatening in immunocompromised patients (e.g., Pneumocystis pneumonia, cytomegalovirus infections).
Therapeutic Use
In medicine, immunosuppression is deliberately used to reduce immune activity in cases where the immune system attacks the body itself or rejects foreign tissue:
- Organ transplantation: After kidney, heart, or liver transplantation, the immune system must be persistently suppressed to prevent rejection of the new organ
- Autoimmune diseases: In conditions such as lupus erythematosus, Crohn's disease, multiple sclerosis, or rheumatoid arthritis, the immune system attacks the body's own tissue – immunosuppressants dampen this response
- Bone marrow transplantation: Immunosuppression helps prevent graft-versus-host disease
Diagnosis and Monitoring
Patients undergoing immunosuppression require regular medical monitoring:
- Complete blood counts to assess immune cell levels (e.g., leukocytes, lymphocytes)
- Drug level measurements in the blood (e.g., tacrolimus levels)
- Infection screenings and vaccination status reviews
- Kidney and liver function tests due to potentially organ-toxic medications
Risks and Side Effects
In addition to an increased risk of infection, therapeutic immunosuppression carries further risks:
- Elevated cancer risk (especially skin cancer and lymphatic tumors) due to reduced immune surveillance
- Medication-specific side effects (e.g., kidney damage from ciclosporin, osteoporosis from corticosteroids)
- Impaired vaccine response: live vaccines are contraindicated in severely immunocompromised patients
References
- Abbas AK, Lichtman AH, Pillai S – Cellular and Molecular Immunology, 10th Edition, Elsevier (2022)
- World Health Organization (WHO) – Immunosuppression and Infection Risk: Clinical Guidelines (2021)
- European Society for Organ Transplantation (ESOT) – Guidelines on Immunosuppressive Therapy in Solid Organ Transplantation (2022)
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