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PUVA-induced repigmentation of vitiligo: a histochemical (split-DOPA) and ultrastructural study
The British Journal of Dermatology
|July 1, 1979
Summary
Oral photochemotherapy (8-MOP + UV-A) repigmented vitiligo by activating melanocytes from hair follicle reservoirs. These hyperactive melanocytes repopulated the epidermis, suggesting a key role for hair follicles in vitiligo treatment.
Area of Science:
- Dermatology
- Cell Biology
- Photobiology
Background:
- Vitiligo is a condition characterized by depigmented skin patches.
- Oral photochemotherapy using 8-methoxypsoralen (8-MOP) and ultraviolet A (UV-A) light is a treatment for vitiligo.
Purpose of the Study:
- To investigate the cellular mechanisms of repigmentation in vitiligo patients treated with oral photochemotherapy.
- To identify the origin and characteristics of melanocytes responsible for repigmentation.
Main Methods:
- Histochemical and ultrastructural analysis of skin biopsies from vitiligo patients undergoing treatment.
- Microscopic examination of melanocyte morphology and activity in repigmented areas.
Main Results:
- Hypertrophic melanocytes were observed in hair follicles and the epidermis at the repigmenting border.
- Melanocyte mitosis was not detected in these areas.
- Ultrastructural studies revealed hyperactive melanocytes with larger melanosomes in repigmented skin.
Conclusions:
- Oral photochemotherapy stimulates melanocytes residing in hair follicle reservoirs.
- These activated melanocytes migrate and repopulate the epidermis, driving repigmentation in vitiligo.
- Hair follicles serve as a crucial reservoir for melanocyte repopulation during vitiligo treatment.