Photodermatology, photoimmunology & photomedicine · 2014
Effect of narrow band-ultraviolet B on CD4(+) CD25(high) FoxP3(+) T-lymphocytes in the peripheral blood of vitiligo patients.
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Moftah Nayera H, El-Barbary Rasha A H, Ismail Mona A, Ali Nancy A M
Аннотация
BACKGROUND: It is widely believed that an imbalance between activated CD8(+) T cells and regulatory T cells (Tregs) exists in patients with vitiligo. Although there is evidence that narrow band ultraviolet (NB-UVB) irradiation can induce Tregs' number and activity, but up to our knowledge, none of the published studies involved the possible effect of NB-UVB on Tregs in vitiligo.
OBJECTIVE: To evaluate the effect of NB-UVB on circulating CD4(+) CD25(high) FoxP3(+) regulatory T cells (FoxP3(+) Tregs) in vitiligo.
METHODS: This prospective analytic study included 20 patients with active non-segmental vitiligo and 20 healthy controls. The patients were exposed to NB-UVB therapy three times per week for 30 sessions. Blood sampling before and after NB-UVB phototherapy was done to evaluate circulating CD4(+) CD25(high) Tregs and Foxp3(+) Tregs.
RESULTS: The CD4(+) CD25(high) Tregs% and FoxP3(+) Tregs% were significantly higher in vitiligo patients compared with controls. NB-UVB therapy decreased both of them in patients, but they did not reach those of controls. Each of circulating CD4(+) CD25(high) Tregs% and FoxP3(+) Tregs% didn't correlate with either extent or activity of vitiligo before or after NB-UVB.
CONCLUSION: Tregs functional defect is probably having an impact on NSV. NB-UVB may improve the function of Tregs. Understanding the mechanisms through which NB-UVB exert its effect on reducing the number of circulating Tregs would help open up the paths for future therapeutic options.
OBJECTIVE: To evaluate the effect of NB-UVB on circulating CD4(+) CD25(high) FoxP3(+) regulatory T cells (FoxP3(+) Tregs) in vitiligo.
METHODS: This prospective analytic study included 20 patients with active non-segmental vitiligo and 20 healthy controls. The patients were exposed to NB-UVB therapy three times per week for 30 sessions. Blood sampling before and after NB-UVB phototherapy was done to evaluate circulating CD4(+) CD25(high) Tregs and Foxp3(+) Tregs.
RESULTS: The CD4(+) CD25(high) Tregs% and FoxP3(+) Tregs% were significantly higher in vitiligo patients compared with controls. NB-UVB therapy decreased both of them in patients, but they did not reach those of controls. Each of circulating CD4(+) CD25(high) Tregs% and FoxP3(+) Tregs% didn't correlate with either extent or activity of vitiligo before or after NB-UVB.
CONCLUSION: Tregs functional defect is probably having an impact on NSV. NB-UVB may improve the function of Tregs. Understanding the mechanisms through which NB-UVB exert its effect on reducing the number of circulating Tregs would help open up the paths for future therapeutic options.