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Psoriasis is a chronic inflammatory disease mediated by T cell immunity. Programmed death 1 (PD-1), a coinhibitory receptor, plays an important role in immune regulation and maintaining peripheral tolerance. The aim of the study was to compare the expression of PD-1 on the peripheral T cells between psoriatic patients and healthy controls. The study included 75 psoriatic patients and 52 healthy volunteers. The percentages and absolute numbers of CD3 + , CD4 + , CD8 + , CD4 + PD-1 + , and CD8 + PD-1 +  T cells were analyzed using flow cytometry. The absolute numbers and percentages of CD4 + PD-1 +  and CD8 + PD-1 +  T cells were significantly decreased in the psoriatic patients in comparison with the control group. No significant correlations were found between the absolute numbers and percentages of CD4 + PD-1 +  or CD8 + PD-1 +  T cells and clinical characteristics of psoriasis. Decreased PD-1 expression on the T cells may be responsible for impaired negative regulation of immune response in psoriasis pathogenesis.

Suppressed Programmed Death 1 Expression on CD4+ and CD8+ T Cells in Psoriatic Patients

Suppressed Programmed Death 1 Expression on CD4⁺ and CD8⁺ T Cells in Psoriatic Patients