RESUMEN
BACKGROUND: Lymphocyte enhancer-binding factor-1 (LEF1) is responsible for melanocyte proliferation, migration and differentiation and its downregulation may result in depigmentation in vitiligo. Narrowband UVB (NB-UVB) phototherapy is known to enhance melanocyte migration from hair follicles to lesional epidermis; hence, it may have a role in the upregulation of LEF1. OBJECTIVES: We intended to assess the expression of LEF1 both before and after NB-UVB therapy and correlate it with the extent of re-pigmentation. MATERIALS AND METHODS: In this prospective cohort study, 30 patients of unstable non-segmental vitiligo were administered NB-UVB phototherapy for 24 weeks. Skin biopsies were obtained from acral and non-acral sites in all patients, both prior to initiation and after completion of phototherapy and LEF1 expression was measured. RESULTS: Amongst the 16 patients who completed the study, at 24 weeks, all patients achieved > 50% re-pigmentation. However, > 75% re-pigmentation was achieved in only 11.1% of acral patches, whereas it was achieved in a significantly higher number of non-acral patches (66.6%) (p = 0.05). A significant increase was observed in the mean fluorescent intensity of the LEF1 gene in both acral as well as non-acral areas at 24 weeks as compared to baseline (p = 0.0078), However, no difference was observed between acral and non-acral lesions in the LEF1 expression at 24 weeks or the change in LEF1 expression from baseline. CONCLUSION: LEF1 expression modulates the re-pigmentation of vitiligo lesions after treatment with NBUVB phototherapy.