A Meta-Analysis of Chemokines in Alopecia Areata: Recruiting Immune Cells Toward the Hair Follicle

This study conducted a scoping review and meta-analysis of 46 research articles to investigate chemokine expression in alopecia areata (AA) patients. It found that Th1-associated chemokines, such as CXCL9, CXCL10, CCL5, and CXCL11, were consistently elevated, indicating an IFN-γ–driven response. A Th2 chemokine signature was also noted, with increased levels of CCL13, CCL17, CCL22, and CX3CL1. Additionally, elevated levels of chemokines involved in monocyte/dendritic cell and eosinophil recruitment suggest the involvement of diverse immune pathways. The meta-analysis confirmed significantly elevated serum levels of CXCL9, CXCL10, CXCL8, and CCL17. These findings suggest a complex chemokine profile in AA, dominated by Th1 activity but also involving Th2 and other immune pathways, indicating the potential benefit of broader immunomodulatory strategies.