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Immune Cell Infusion – Therapy, Mechanism & Uses

Immune cell infusion is a therapeutic procedure in which specially prepared immune cells are administered intravenously to strengthen the immune system or treat diseases such as cancer.

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Things worth knowing about "Immune Cell Infusion"

Immune cell infusion is a therapeutic procedure in which specially prepared immune cells are administered intravenously to strengthen the immune system or treat diseases such as cancer.

What Is an Immune Cell Infusion?

An immune cell infusion is a medical procedure in which specially prepared or modified immune cells are introduced directly into a patient´s bloodstream via intravenous infusion. The goal is to selectively enhance the body´s natural defenses or to treat specific diseases, particularly cancers and severe infections. This therapy falls within the field of immunotherapy and is increasingly used in modern medicine.

Mechanism of Action

Immune cells are the central players of the human immune system. The cell types most commonly used in immune cell infusions include:

T lymphocytes (T cells): These cells recognize and destroy diseased or malignant cells.
Natural killer cells (NK cells): They attack tumor cells and virus-infected cells without requiring prior sensitization.
Dendritic cells: They activate other immune cells and play a key role in coordinating the immune response.
CAR T cells: Genetically engineered T cells equipped with a chimeric antigen receptor (CAR), designed to specifically identify and destroy cancer cells.

The cells may be collected from the patient (known as an autologous infusion) or from a suitable donor (allogeneic infusion), then expanded in a laboratory and potentially genetically modified before being reinfused.

Areas of Application

Immune cell infusions are used across several medical fields:

Oncology: Treatment of blood cancers (e.g., leukemia, lymphoma) and solid tumors, especially when other therapies have failed.
Infectious diseases: Supporting the immune system in cases of severe viral or bacterial infections.
Autoimmune diseases: In experimental approaches aimed at regulating overactive immune responses.
Stem cell transplantation: As a supportive therapy following bone marrow transplantation.

How the Therapy Is Performed

The process of an immune cell infusion typically involves several steps:

Collection: Immune cells are obtained from the blood of the patient or a donor through a process called leukapheresis, in which blood is drawn, the immune cells are filtered out, and the remaining blood is returned.
Preparation: In the laboratory, the cells are expanded, activated, or genetically engineered (e.g., in CAR T cell therapy).
Conditioning: Prior to the infusion, the patient often receives preparatory chemotherapy to create space for the new cells.
Infusion: The prepared cells are administered intravenously, similar to a blood transfusion.
Follow-up care: Close monitoring for potential side effects and evaluation of therapeutic success.

Risks and Side Effects

Immune cell infusions can be associated with serious side effects that require careful medical supervision:

Cytokine release syndrome (CRS): A severe immune reaction characterized by fever, low blood pressure, and organ stress, which may require intensive care treatment.
Neurotoxicity: In some cases, neurological symptoms such as confusion or seizures may occur.
Infections: As the immune system may be temporarily weakened, there is an increased risk of infection.
Rejection reactions: In allogeneic infusions, a condition called graft-versus-host disease (GvHD) may occur, in which the transferred immune cells attack the patient´s own tissue.

Current Developments and Future Outlook

Immune cell infusion therapy, particularly CAR T cell therapy, is considered one of the most significant innovations in modern oncology. Several products have already received approval from regulatory agencies including the EMA (European Medicines Agency) and the FDA (U.S. Food and Drug Administration). Ongoing clinical trials are investigating the use of these therapies for additional cancer types, autoimmune diseases, and chronic infections. Advances in genetic engineering and cell cultivation hold the promise of even more effective and safer treatment options in the future.

References

June, C. H. et al. - CAR T cell immunotherapy for human cancer. Science, 359(6382), 1361-1365 (2018). Available at: https://pubmed.ncbi.nlm.nih.gov/29567707/
European Medicines Agency (EMA) - CAR T cell therapies: Approval overview. Available at: https://www.ema.europa.eu
Hartmann, J. et al. - Clinical development of CAR T cells - challenges and opportunities in translating innovative treatment concepts. EMBO Molecular Medicine, 9(9), 1183-1197 (2017). Available at: https://pubmed.ncbi.nlm.nih.gov/28765140/

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