Interleukin 31 in vitiligo patients with and without pruritus.

Introduction: Vitiligo is a prevalent skin disorder characterized by the destruction of melanocytes, leading to depigmented patches across various areas of the body. Interleukin (IL)-31 has been implicated in the development of pruritus and skin inflammation, potentially contributing to cutaneous symptoms. This study measures IL-31 levels in vitiligo patients with and without pruritus, comparing them to healthy controls, and explores the relationship between IL-31 levels, disease activity, and other clinical factors to assess its potential role in the early diagnosis of vitiligo.

Methods: Ninety individuals were enrolled in the study and equally divided into three groups: vitiligo, vitiligo with pruritus, and healthy controls. The serum level of IL-31 was measured using the enzyme-linked immunosorbent assay (ELISA).

Results: Significant differences in IL-31 levels were observed across all groups. IL-31 levels were highest in vitiligo patients with pruritus, followed by those without pruritus, and lowest in healthy controls, with mean values and standard deviations of 196 ± 67.28, 152.10 ± 74.39, and 80.03 ± 32.30 pg/ml, respectively. In addition, IL-31 levels in serum showed significant differences in relation to disease activity in both vitiligo groups. Positive correlations were found between IL-31 levels and the Vitiligo Area Scoring Index (VASI) and Vitiligo Disease Activity (VIDA) in both patient groups, as well as between IL-31 levels and lesion extent in vitiligo patients without pruritus. In patients with pruritus, IL-31 levels also positively correlated with age and the 5-dimension itch scale score.

Conclusion: IL-31 may serve as a crucial marker and play a significant role in the early diagnosis of vitiligo in patients both with and without pruritus.