Expression of immune checkpoints in active nonsegmental vitiligo: a pilot study

Area of Science:

• Immunology
• Dermatology
• Pathology

Background:

• Vitiligo is a depigmentary condition linked to melanocyte destruction, potentially due to a faulty immune response.
• Aberrant T-cell activity may drive vitiligo, with immune checkpoints like PD-1 and CTLA-4 regulating T-cell function.

Purpose of the Study:

• To investigate the expression patterns of PD-1 and CTLA-4 in the skin of patients with active nonsegmental vitiligo (NSV).

Main Methods:

• A pilot study involving 30 NSV patients.
• Skin biopsies from marginal, lesional, and nonlesional areas were analyzed for PD-1 and CTLA-4 expression using immunohistochemistry.

Main Results:

• Inflammatory infiltrates were significantly more abundant in marginal and lesional skin compared to nonlesional skin.
• PD-1 and CTLA-4 expression was significantly elevated in marginal and lesional infiltrates versus nonlesional skin.
• PD-1 expression was notably higher at the lesion margin than within the lesion, while CTLA-4 showed no significant difference between these areas. Positive correlations were observed between PD-1 and CTLA-4 expression.

Conclusions:

• PD-1 and CTLA-4 are present in the inflammatory infiltrate of active NSV skin.
• Further research is needed to elucidate the precise role of these immune checkpoints in vitiligo development and progression.