Th17 cytokines stimulate CCL20 expression in keratinocytes in vitro and in vivo: implications for psoriasis pathogenesis.

Th17 cytokines stimulate CCL20 expression in keratinocytes in vitro and in vivo: implications for psoriasis pathogenesis.
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DOI:
10.1038/jid.2009.65
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发表时间:
2009-09
期刊:
The Journal of investigative dermatology
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其他
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最近发现辅助 T (Th) 17 细胞与银屑病发病机制有关,但这些细胞如何进入发炎皮肤的机制尚不清楚。通过白细胞介素 (IL)-17A 和 IL-22 的免疫染色,我们发现银屑病病变中存在大量产生这些细胞因子的细胞。接下来我们发现,Th17细胞因子(IL-17A、IL-22和肿瘤坏死因子(TNF)-α)以剂量和时间依赖性方式显着增加人角质形成细胞单层和筏培养物中CC趋化因子配体(CCL)20(一种CC趋化因子受体(CCR)6配体)的表达。最后,我们在小鼠中证明,皮下注射重组 IL-17A、IL-22 或 TNF-α 会导致皮肤中 CCL20 和 CCR6 表达以及皮肤 T 细胞浸润的上调。总而言之,这些数据表明 Th17 细胞因子在体外和体内刺激 CCL20 的产生,从而为 CCR6 阳性 Th17 细胞如何通过正趋化反馈回路维持其在银屑病中的持续存在提供了潜在的解释。
T helper (Th) 17 cells have recently been implicated in psoriasis pathogenesis, but mechanisms of how these cells traffic into inflamed skin are unknown. By immunostaining for interleukin (IL)-17A and IL-22, we show numerous cells present in psoriasis lesions that produce these cytokines. We next found that Th17 cytokines (IL-17A, IL-22, and tumor necrosis factor (TNF)-α) markedly increased the expression of CC chemokine ligand (CCL) 20, a CC chemokine receptor (CCR)6 ligand, in human keratinocyte monolayer and raft cultures in a dose- and time-dependent manner. Lastly, we showed in mice that subcutaneous injection with recombinant IL-17A, IL-22, or TNF-α led to the upregulation of both CCL20 and CCR6 expression in skin as well as cutaneous T-cell infiltration. Taken together, these data show that Th17 cytokines stimulate CCL20 production in vitro and in vivo, and thus provide a potential explanation of how CCR6-positive Th17 cells maintain their continual presence in psoriasis through a positive chemotactic feedback loop.
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