This study observed two distinct groups of alopecia areata lesions based on PD-1 expression in T cells from biopsied skin samples, suggesting potential differences in subtypes or stages of the disease that warrant further investigation.
April 2023 in “Journal of Investigative Dermatology” This study found that in biopsied skin samples of alopecia areata, a lower anagen/telogen ratio was associated with increased T cell infiltration, and enhancing the PD-1/PD-L1 axis may inhibit CD8+T cell infiltration and improve the condition.
March 2024 in “International Journal of Cosmetic Science” This study observed that dandruff-affected scalp skin has increased T-cell infiltration in the epidermis and a reduction in the hair follicle's physiological immune privilege, particularly in the suprabulbar outer root sheath area, indicating a distinct immune microenvironment compared to healthy scalp.
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March 1997 in “Journal of Cutaneous Pathology” This study observed that patients with alopecia areata often have a T-cell receptor repertoire in skin lesions that suggests a specific antigen-driven immune response may be important in the disease's pathogenesis.
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April 2017 in “Experimental dermatology” This study found that B6.CD80CD86−/− mice developed autoimmune-like alopecia with nearly 100% incidence by 40 weeks, making them a promising model for studying human alopecia areata.
