Other chemokines

Other chemokines is a broad, non-specific category used to group chemotactic cytokines that do not belong to the two primary subfamilies, CC and CXC. This classification typically encompasses the C (or XC) subfamily, which lacks two of the four conserved cysteine residues (e.g., XCL1/Lymphotactin), and the CX3C subfamily, characterized by three amino acids between the first two cysteines (e.g., CX3CL1/Fractalkine) [2, 4, 11]. These proteins function as specialized signaling molecules that regulate the migration, positioning, and activation of specific leukocyte subsets, such as natural killer (NK) cells and T cells, through their respective G protein-coupled receptors [1, 11]. In pathological contexts, these chemokines are implicated in chronic inflammatory conditions like rheumatoid arthritis, neurodegenerative diseases, and the promotion of tumor metastasis [3, 12]. Because this is a heterogeneous grouping rather than a single therapeutic target, drug development is focused on individual members, such as the anti-CX3CL1 antibody E6011 or CX3CR1 antagonists like AZD8797 [10, 12]. Therapeutic strategies aim to selectively modulate immune cell recruitment to treat inflammatory and malignant diseases while minimizing the broad immunosuppression associated with targeting more ubiquitous chemokine pathways [5, 10].

Other names

C chemokinesCX3C chemokinesXC chemokinesAtypical chemokinesNon-classical chemokinesC-type chemokinesCX3C-type chemokines

Inhibition of chemokine-receptor interactions through ligand-neutralizing monoclonal antibodies or small-molecule antagonism of cognate G protein-coupled receptors (e.g., CX3CR1, XCR1).