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Evaluation of apoptosis regulatory proteins in response to PUVA therapy for psoriasis.
MedLine Citation:
PMID:  23281693     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
BACKGROUND: The histopathologic changes characteristic of psoriasis might be related to suppressed apoptosis. One of the actions of psoralen ultraviolet A (PUVA) in psoriasis could be exerted through induction of apoptosis of keratinocytes and lymphocytes; however, its exact molecular mechanism is still confusing.
AIM: In this study, we evaluated the expression of pro-apoptotic (P53, Fas and Bax) and anti-apoptotic (Bcl-2) proteins correlating it with apoptotic index (AI) and epidermal thickness in psoriatic skin before and after PUVA therapy.
METHODS: Lesional and non-lesional skin biopsy specimens were obtained from 10 patients with generalized plaque psoriasis before and after 8 weeks of PUVA therapy. Histometric measurements of epidermal thickness as well as P53, Fas, Bax and Bcl-2 expressions were evaluated using immunoperoxidase technique and apoptotic cells were detected by terminal deoxynucleotide transferase (TdT) mediated deoxyuridine triphosphate nick end labeling (TUNEL) method.
RESULTS: After PUVA therapy, the epidermal thickness of psoriatic skin was significantly decreased (P < 0.001) and keratinocytes of psoriatic skin showed significant increased expression of P53 (P < 0.001), Fas (P < 0.001) and Bcl-2 (P < 0.001) with no significant change in Bax expression (P > 0.05). Apart from significant decrease of Bcl-2 expression (P = 0.01), no significant difference in all previous markers were encountered in lymphocytes (P53, Fas and Bax; P > 0.05) after PUVA therapy. The AI was significantly increased (P = 0.008) after PUVA therapy especially in lymphocytes (P = 0.002).
CONCLUSION: The present study suggests that one of the actions of PUVA therapy in psoriasis might be exerted through induction of apoptosis especially of lymphocytes by suppression of Bcl-2 expression and of keratinocytes through P53 and Fas pathways leading to healing of psoriasis.
Authors:
Moetaz El-Domyati; Noha H Moftah; Ghada A Nasif; Hossam M Abdel-Wahab; Manal T Barakat; Rasha T Abdel-Aziz
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Photodermatology, photoimmunology & photomedicine     Volume:  29     ISSN:  1600-0781     ISO Abbreviation:  Photodermatol Photoimmunol Photomed     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-03     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9013641     Medline TA:  Photodermatol Photoimmunol Photomed     Country:  England    
Other Details:
Languages:  eng     Pagination:  18-26     Citation Subset:  IM    
Copyright Information:
© 2013 John Wiley & Sons A/S.
Affiliation:
Department of Dermatology, STD's and Andrology, Al-Minya University, Al-Minya, Egypt.
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