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Background & Objective:  CD137 is a member of the TNF-Receptor family. TNF-alpha antagonists have therapeutic effect in active psoriasis. In this study, the relative frequency of CD137 expression was investigated in the inflammatory cells of psoriasis lesions for the first time.Methods:  The specimens were obtained from pathology department of Al-Zahra hospital from paraffin-embedded skin specimens collected from 2007 till 2016. . A total number of f 64 psoriasis skin specimens and 34 normal skin specimens were reviewed for the diagnosis. Then, the immunohistochemical staining for CD137, CD4, and CD8 was performed.Results:  CD137 expression of dermal inflammatory cells in psoriasis lesions was 11.19±5.5%. Although, in normal skin tissues, CD137 expression was observed in 1.3±3.03% of the inflammatory cells. ( P =0.001). The relative frequency of the CD137 positive inflammatory cells was significantly higher in the epidermis compared to dermis (epidermis: 31.1%±12.8, dermis 11.1%±5.5). There was no remarkable relation between the CD137 expression rate and the CD4: CD8 ratio.Conclusion:  CD137 as a TNF-alpha receptor has a significant role in pathogenesis of the psoriasis lesions. Therefore, CD137 antagonists can be considered as a novel target for the treatment of incurable psoriasis patients.

CD137: A Member of the TNFR Family - in Psoriasis Skin Lesions in Comparison with Normal Skin Specimens