Evaluation of the Role of Keratinocytes Apoptosis in Vitiligo: Immunohistochemical Expression of MART1 and P53
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- Category: Vol. 85, September 2017
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Evaluation of the Role of Keratinocytes Apoptosis in Vitiligo: Immunohistochemical Expression of MART1 and P53, MOHAMMED H.M. EL-MAHDY, NAIEMA A.M. MARIE, SAMIA M. GABAL and MOSTAFA S. SALEM
Abstract
Background: Vitiligo is an acquired, hypomelanotic skin disorder characterized by circumscribed depigmented macules. Most studies on vitiligo have concentrated on the abnormality of melanocytes rather than the abnormality of keratinocytes. Some studies supported the hypothesis that keratinocytes apoptosis may play a role in the pathogenesis of vitiligo.
Objectives: To assess the role of keratinocytes apoptosis in the pathogenesis of vitiligo through the studying of immu-nohistochemical presence and distribution of MART 1and P53 in the epidermis.
Patients and Methods: Thirty five patients having non segmental vitiligo were recruited from the outpatient clinic (all active therapies were stopped at least 3 weeks prior to inclusion in the study) as well as twenty (age and sex matched) volunteers (vitiligo free) were included in the study as control group. All patients were subjected to complete history taking with special emphasis on the duration of the disease. Patients underwent skin biopsies (lesional, perilesional and non lesional) and 1 skin biopsy was taken from every control volunteer. H & E staining was performed for histopathological examination and Immunohistochmical staining with MART1 was done for lesional biopsies to confirm the clinical diag-nosis. P53 immunostaining were done for all biopsies and statistical analysis was done to compare the results in patients and controls.
Results: Regarding to immunostaining of P53, there was a highly significant difference between lesional biopsies of cases and control groups. Also there was a highly significant difference between lesional biopsies of cases and perilesional and non lesional biopsies of the same cases. No significant difference was noted regarding the disease stability.
Conclusion: Vitiligo is not a disease confined to melano-cytes. Keratinocytes apoptosis may play prominent role in the pathogenesis of the disease.