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Lymphocyte Isolation from Human Skin for Phenotypic Analysis and Ex Vivo Cell Culture
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TCR+CD3+CD4-CD8- effector T cells in psoriasis.
D Brandt1, M Sergon2, S Abraham3
1Division of Pediatric Rheumatology and Immunology, Children's Hospital Dresden, Faculty of Medicine Carl Gustav Carus, TU Dresden, Dresden, Germany.
Clinical Immunology (Orlando, Fla.)
|June 20, 2017
Summary
Double negative (DN) T cells in psoriasis patients show reduced gene methylation and increased PD-1 expression, infiltrating skin lesions. These findings offer insights into psoriasis pathophysiology and potential therapeutic targets.
Area of Science:
- Immunology
- Dermatology
- Molecular Biology
Background:
- Psoriasis is an autoimmune skin disorder involving keratinocyte proliferation and immune cell infiltration.
- Double negative (DN) T cells (TCR+CD3+CD4-CD8-) can arise from CD8+ T cells.
- Programmed death-1 (PD-1) is an inhibitory molecule crucial for peripheral tolerance.
Purpose of the Study:
- To investigate the characteristics and role of DN T cells in psoriasis.
- To explore the expression of PD-1 on DN T cells in psoriatic lesions.
- To identify potential biomarkers and therapeutic targets for psoriasis.
Main Methods:
- Flow cytometry to analyze T cell subsets and PD-1 expression.
- Analysis of DNA methylation in the IFNG gene.
- Immunohistochemistry to examine T cell infiltration in psoriatic skin.
Main Results:
- A majority of DN T cells exhibit effector memory phenotypes, express IFN-γ, and do not proliferate.
- DN T cells from psoriasis patients show reduced IFNG gene DNA methylation and increased PD-1 expression.
- PD-1 positive DN T cells are found within the epidermis of psoriatic skin lesions.
Conclusions:
- DN T cells, particularly PD-1 positive subsets, are implicated in the pathophysiology of plaque psoriasis.
- Altered IFNG gene methylation and elevated PD-1 expression in DN T cells are key features in psoriasis.
- PD-1 positive DN T cells represent promising biomarkers and potential therapeutic targets for psoriasis interventions.
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