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Year : 2016  |  Volume : 3  |  Issue : 2  |  Page : 52-56

Paucity of forkhead box protein 3+ regulatory T-cells in psoriatic skin compared to other inflammatory dermatoses

Department of Dermatology, Andrology and STDs, Mansoura University Hospitals, Mansoura, Egypt

Correspondence Address:
Marwa Zohdy
86, Al Ghofran St. from Al Kholafaa Al Rashedden, Mansoura
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/2349-6029.195220

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Introduction: Forkhead box protein 3 (Foxp3+) regulatory T-cells (Treg cells) are essential to maintain balance between pro- and anti-inflammatory responses. They play a role in maintaining homeostasis by locally suppressing other skin-resident T-cells thus protecting against autoimmune reactions. Thus, they have been the focus of authors' attention in skin T-cell-mediated diseases in the last decade. The Foxp3 gene encodes a transcription factor thought to be important for the function of Treg cells and represents a reliable marker. Contradictory results have been reported in literature about Treg cell densities in the skin of different inflammatory dermatoses including psoriasis, eczema, pityriasis lichenoides chronica (PLC), and cutaneous lupus erythematosus. Patients and Methods: This was a cross-sectional study on lesional skin biopsies from 10 cases of psoriasis, 10 of spongiotic dermatitis, and 16 cases of lichenoid dermatoses (10 of PLC and 6 of discoid lupus erythematosus. We compared the densities of Foxp3+ Treg cells in relation to CD4+ cells in the epidermis and dermis between these groups using Foxp3 and CD4 monoclonal antibodies.Results: Epidermal Foxp3+ CD4+ Treg cells were lower in psoriasis and lichenoid groups than spongiotic group and dermal Foxp3+ CD4+ Treg cells were lower in psoriasis than lichenoid and spongiotic groups. Conclusions: Treg cells have been proved to suppress other skin-resident T-cells and prevent autoimmunity. Being an autoimmune inflammatory dermatosis, psoriasis showed an overall lower density of Foxp3+ CD4+ Treg cells than spongiotic or lichenoid dermatitis. This supports the theory of Treg cell consumption in psoriatic skin due to conversion to interleukin 17 producers.

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