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This study suggests that cultured hair follicle dermal sheath cup cells exhibit immune privilege properties, partly through the expression of PD-L1, which impacts co-cultured immune cells' behavior.

In this study, researchers found that in mouse models of alopecia areata, the expression of immune-regulating molecules PD-L1 and PD-L2 in dermal fibroblasts is increased by activated T cells, potentially indicating a lack of negative immune control in affected skin.

Anti-PD-L1 immunotherapy can cause hair loss and unexpected hair color change, but treatment can restore hair growth and color.

This study found that intravenous administration of a shark-derived receptor antibody, 3P17, promoted hair growth in mice by increasing hair matrix cell proliferation and activating leptin-STAT3 signaling, with transdermal leptin delivery enhancing this effect through improved skin penetration.

This study found that epidermal growth factor receptor and mitogen activated protein kinase inhibitors down-regulate PD-L1 expression in human hair follicles, which may contribute to sterile folliculitis in treated patients.