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IL-25 promotes Th2-type reactions and correlates with disease severity in the pathogenesis of oral lichen planus.

Abstract：

OBJECTIVE:The aim of the present study was to investigate the correlation between IL-25 expression and disease severity, and the potential immunoregulatory role of IL-25 expression in oral lichen planus (OLP). MATERIALS AND METHODS:The oral mucosal tissue samples obtained from OLP patients and healthy controls (HCs) were analyzed for IL-25 expression by real-time quantitative PCR (qPCR) and immunohistochemistry. Recombinant IL-25 was used to stimulate OLP patient-derived CD4 + T cells, and then IL-4 secretion and mRNA expression were evaluated by ELISA and qPCR, respectively. The efficiency of the siRNA-mediated knockdown of IL-25R expression in oral keratinocytes was determined by qPCR and Western blotting. Human oral keratinocyte cells were cultured with the recombinant human cytokines IL-25, IL-17 A and IL-17 F. The production of associated cytokines by keratinocytes was determined by qPCR. Statistical analyses of quantitative data were performed using SPSS software. RESULTS:The IL-25 and IL-4 mRNA levels were elevated and correlated significantly with each other in specific OLP subtype lesions compared to HCs, while the numbers of IL-25 positive cells were also increased in local OLP lesions as compared to HCs. In vitro culture with recombinant IL-25 could significantly promote CD4 + T cells from both subtypes of OLP to produce IL-4 mRNA and remarkably elevate supernatant IL-4 levels in reticular OLP CD4 + T cell cultures, which may be attributed to the elevated expression of IL-25R in local OLP lesions. Statistical analyses demonstrated that the simultaneously increased levels of IL-4, CXCL8 and CCL20 in keratinocytes were induced by IL-25 but not IL-17 A or IL-17 F. Decreasing IL-25R subunit expression by siRNA-mediated knockdown significantly blocked the expression of all cytokine-produced inflammatory mediators in oral keratinocytes. CONCLUSIONS:In OLP lesions, IL-25 can function to mediate the Th2 response in specific disease subtypes, which may be an important cause of OLP disease chronicity and persistent inflammation.

journal_name

Arch Oral Biol

journal_title

Archives of oral biology

authors

Wang H,Jiang Y,Wang H,Luo Z,Wang Y,Guan X

doi

10.1016/j.archoralbio.2018.11.015

subject

Has Abstract

pub_date

2019-02-01 00:00:00

pages

115-121

eissn

0003-9969

issn

1879-1506

pii

S0003-9969(18)30363-7

journal_volume

pub_type

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IL-25 promotes Th2-type reactions and correlates with disease severity in the pathogenesis of oral lichen planus.