Novel Circulating Natural Killer Cell Subset as Biomarkers in Alopecia Areata Progression

This study investigates the role of natural killer (NK) cells in the pathogenesis of alopecia areata (AA) and identifies potential peripheral blood biomarkers for disease risk or progression. By analyzing peripheral blood from AA patients and controls using multiparametric flow cytometry, researchers found a significant increase in the frequency of CLA and CD38 co-expression clusters in CD56dim NK cells in AA patients. Conversely, the frequency of NKG2A and CD38 co-expression clusters in CD56dim NK cells decreased in AA. No significant differences were observed in four CD56bright NK cell clusters between patients and controls. Significant correlations were found between CD56dim clusters and the SALT score, providing insights into AA immunopathogenesis and potential biomarkers for disease progression.