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CCR7 - Chemokine Receptor & Immune Cell Migration
CCR7 is a chemokine receptor on immune cells that controls the migration of T cells and dendritic cells into lymph nodes, playing a central role in the immune response.
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CCR7 is a chemokine receptor on immune cells that controls the migration of T cells and dendritic cells into lymph nodes, playing a central role in the immune response.
What is CCR7?
CCR7 (CC Chemokine Receptor Type 7, also known as CD197) is a G protein-coupled receptor expressed on the surface of various immune cells. It belongs to the family of CC chemokine receptors and specifically binds the chemokines CCL19 and CCL21. This binding controls the targeted migration of immune cells into secondary lymphoid organs such as lymph nodes and the spleen.
Biological Function
CCR7 plays a central role in the organization and regulation of the immune system. Its key functions include:
- Lymphocyte homing: CCR7 directs naive T cells and central memory T cells into the T cell zones of lymph nodes, where they can encounter antigens.
- Dendritic cell migration: Mature dendritic cells use CCR7 to migrate from peripheral tissues to regional lymph nodes, where they initiate an immune response.
- Immune homeostasis: By controlling the distribution of immune cells, CCR7 contributes to maintaining immunological balance.
- Central tolerance development: CCR7 is involved in the migration of T cells within the thymus and thus in the prevention of autoimmunity.
CCR7 in the Immune Response
When the immune system encounters pathogens or foreign substances, dendritic cells become activated and increase their CCR7 expression. This causes them to migrate to the nearest lymph nodes, where they present the captured antigens to naive T cells. This process is essential for initiating an adaptive immune response. Additionally, CCR7 influences the differentiation of T helper cells and the formation of memory T cells, which enable a rapid immune reaction upon re-infection.
CCR7 and Disease
Tumor Immunology and Metastasis
CCR7 has gained particular importance in oncology. Many tumor cells express CCR7 and use this receptor to migrate into lymph nodes in a manner similar to immune cells. This promotes lymphogenic metastasis in various cancers, including:
- Breast cancer
- Gastric cancer
- Non-small cell lung carcinoma
- Colorectal carcinoma
- Various lymphomas (e.g., chronic lymphocytic leukemia)
High CCR7 expression on tumor cells often correlates with a less favorable prognosis and increased lymph node metastasis.
Autoimmune Diseases
Alterations in CCR7 expression or function are associated with various autoimmune diseases, including rheumatoid arthritis, multiple sclerosis, and systemic lupus erythematosus. Disrupted CCR7-mediated trafficking of regulatory T cells can contribute to uncontrolled inflammation.
Infectious Diseases
CCR7 is relevant to the immune response against various pathogens. In chronic infections such as HIV, CCR7 expression on T cells can be altered, affecting the quality of the immune response.
CCR7 as a Therapeutic Target
Due to its central role in immune cell migration and tumor metastasis, CCR7 is a promising therapeutic target for novel treatment approaches:
- Antibody therapies: Monoclonal antibodies targeting CCR7 are being investigated to inhibit the metastasis of tumor cells.
- CAR T cell therapy: CCR7 is used to direct CAR T cells specifically into lymph nodes and enhance their antitumor activity.
- Vaccine development: A better understanding of CCR7 could help develop vaccines that generate a stronger and more durable immune response.
- Immunomodulation: CCR7 antagonists are being studied as a potential therapy for autoimmune diseases.
Diagnostic Relevance
In laboratory diagnostics and research, CCR7 (also referred to as CD197) serves as a marker for characterizing T cell subpopulations. The distinction between naive T cells (CCR7+/CD45RA+), central memory T cells (CCR7+/CD45RA-), and effector memory T cells (CCR7-/CD45RA-) is important for understanding immune deficiencies and the effectiveness of immunotherapies.
References
- Forster R. et al. - CCR7 coordinates the primary immune response by establishing functional microenvironments in secondary lymphoid organs. Cell. 1999;99(1):23-33.
- Comerford I. et al. - The chemokine receptor CCR7 in immunology and medicine. European Journal of Immunology. 2013;43(3):595-606.
- Muller A. et al. - Involvement of chemokine receptors in breast cancer metastasis. Nature. 2001;410(6824):50-56.
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