CCR7

CCR7 (C-C chemokine receptor type 7), also designated CD197, is a G protein-coupled receptor that binds chemokines CCL19 and CCL21. It mediates lymphocyte trafficking to secondary lymphoid tissues by guiding naive T cells and dendritic cells to lymph nodes via chemotaxis. Signaling through CCR7 activates downstream pathways including MAPK, PI3K/Akt, and NF-κB, regulating cell migration, survival, and immune synapse formation. Dysregulation of CCR7 is implicated in cancer metastasis (particularly lymph node dissemination in breast, colorectal, and melanoma malignancies), autoimmune disorders (rheumatoid arthritis, multiple sclerosis), and lymphoma progression. Therapeutic strategies targeting CCR7 include small-molecule antagonists (e.g., Cmp2105) and monoclonal antibodies in preclinical development, aiming to block cancer cell homing or modulate immune cell trafficking. Challenges persist due to structural complexity of chemokine-receptor interactions and tissue-specific signaling effects.