CCL23 is a C-C motif chemokine that functions as a selective chemoattractant for resting T lymphocytes, monocytes, and neutrophils through CCR1 binding 1. It inhibits myeloid progenitor cell proliferation and promotes angiogenesis 2. CCL23 is produced by multiple cell types including eosinophils, neutrophils, and monocyte-derived macrophages, with production enhanced by GM-CSF, IL-5, and toll-like receptor agonists 12. In allergic airway inflammation, the CCL6-CCR1 axis (CCL23 in humans) promotes eosinophil differentiation through crosstalk between eosinophils and hematopoietic stem cells 3. CCL23 plays roles in atopic dermatitis pathogenesis, where sympathetic nerve hyperactivation enhances the CCL23-CCR1 axis on basophils, correlating with disease severity 4. In tuberculosis infection, monocyte-derived macrophages expressing high CCL23 recruit CD8+ T cells through CCL20/CCR6, associating with protective immunity in latent infection 5. CCL23 serves as a biomarker in cancer microenvironments and tuberculosis diagnosis, with elevated plasma levels correlating with active TB and disease severity 67. These findings indicate CCL23 functions as both a pro-inflammatory mediator and potential diagnostic/prognostic biomarker across multiple infectious and inflammatory diseases.