Abstract | BACKGROUND:
Psoriasis is one of the most common chronic inflammatory diseases of the skin. Recently, IL-17-producing T cells have been shown to play a critical role in psoriatic inflammation. Programmed cell death 1 (PD-1) is a coinhibitory receptor expressed on T cells in various chronic inflammatory diseases; however, the expression and function of PD-1 during psoriatic inflammation have not previously been characterized. OBJECTIVE: METHODS: PD-1 expression on IL-17A-producing γδ T cells from imiquimod-treated mice was examined by means of multicolor flow cytometric analysis. In the psoriatic skin of patients, PD-1 and IL-17A expression was analyzed by using immunofluorescence. The therapeutic effect of PD-L1-Fc fusion protein (PD-L1-Fc) was assessed in imiquimod-treated mice ex vivo and in vivo. RESULTS: During imiquimod-induced psoriatic inflammation, PD-1 is overexpressed on CD27(-)Vγ1(-) γδ T cells. Furthermore, PD-1 expression on IL-17A(+) T cells was confirmed in psoriatic skin tissues from patients and imiquimod-treated mice. In the CD27(-)Vγ1(-) γδ T-cell population, Vγ4(-) γδ T cells with Vγ6 mRNA expression showed a high level of PD-1 expression. Furthermore, these PD-1(hi)Vγ4(-) (Vγ6(+)) γδ T cells were specialized for anti-CD3-induced IL-17A production, which was inhibited by PD-L1-Fc treatment. In imiquimod-treated mice PD-L1-Fc reduced psoriatic inflammation when given alone and enhanced the therapeutic effect of anti-p40 when given in combination. CONCLUSION: PD-1 is overexpressed in IL-17A-producing T cells in both imiquimod-treated mice and patients with psoriasis. Moreover, recombinant PD-L1-Fc alleviates psoriatic inflammation in imiquimod-treated mice.
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Authors | Jong Hoon Kim, Young Joon Choi, Byung Ha Lee, Mi-Young Song, Chae Yeon Ban, Jihye Kim, Junsik Park, Song-Ee Kim, Tae-Gyun Kim, Su-Hyung Park, Hyoung-Pyo Kim, Young-Chul Sung, Soo-Chan Kim, Eui-Cheol Shin |
Journal | The Journal of allergy and clinical immunology
(J Allergy Clin Immunol)
Vol. 137
Issue 5
Pg. 1466-1476.e3
(05 2016)
ISSN: 1097-6825 [Electronic] United States |
PMID | 26824999
(Publication Type: Journal Article)
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Copyright | Copyright © 2016 American Academy of Allergy, Asthma & Immunology. Published by Elsevier Inc. All rights reserved. |
Chemical References |
- Adjuvants, Immunologic
- Aminoquinolines
- B7-H1 Antigen
- IL17A protein, human
- Interleukin-17
- PDCD1 protein, human
- Programmed Cell Death 1 Receptor
- Recombinant Proteins
- Imiquimod
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Topics |
- Adjuvants, Immunologic
- Aminoquinolines
- Animals
- B7-H1 Antigen
(pharmacology, therapeutic use)
- Humans
- Imiquimod
- Inflammation
(metabolism)
- Interleukin-17
(metabolism)
- Mice, Inbred C57BL
- Programmed Cell Death 1 Receptor
(metabolism)
- Psoriasis
(chemically induced, drug therapy, metabolism)
- Recombinant Proteins
(pharmacology, therapeutic use)
- Skin
(drug effects, metabolism)
- T-Lymphocyte Subsets
(metabolism)
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