Aryl hydrocarbon receptor activation restores filaggrin expression via OVOL1 in atopic dermatitis.

Aryl hydrocarbon receptor activation restores filaggrin expression via OVOL1 in atopic dermatitis.
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DOI:
10.1038/cddis.2017.322
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发表时间:
2017-07-13
影响因子:
9
通讯作者:
Furue M
Furue M
中科院分区:
生物学1区
文献类型:
--
作者:
Tsuji G;Hashimoto-Hachiya A;Kiyomatsu-Oda M;Takemura M;Ohno F;Ito T;Morino-Koga S;Mitoma C;Nakahara T;Uchi H;Furue M

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聚丝蛋白(Filaggrin,FLG)突变是一种已被证实的特应性皮炎(atopic dermatitis,AD)的遗传异常。AD的全基因组关联研究揭示了其他易感基因,例如Ovo-like 1(OVOL 1)。然而,FLG和OVOL 1之间的关系尚不清楚。由于芳烃受体(AHR;配体激活的转录因子),在角质形成细胞中的FLG表达中起作用,我们假设AHR通过OVOL 1调节FLG表达。为了证明这一机制,我们分析了FLG在OVOL 1过表达或OVOL 1敲低的正常人表皮角质形成细胞(NHEK)中的表达。此外,我们测试了内源性AHR配体6-甲酰吲哚并(3,2-B)咔唑(FICZ)或临床使用的大豆焦油Glyteer是否激活了NHEKs中的FLG和OVOL 1表达。我们发现(1)OVOL 1调节FLG表达;(2)AHR激活上调OVOL 1;(3)AHR激活通过OVOL 1上调FLG。此外,与正常皮肤相比,AD皮肤中OVOL 1的核转位不太明显。IL-4处理的NHEK,一种体外AD皮肤模型,也显示出对OVOL 1核转位的抑制,FICZ和Glyteer恢复了这种抑制。因此,靶向AHR-OVOL 1-FLG轴可能为AD提供新的治疗方法。
Filaggrin (FLG) mutation is a well-confirmed genetic aberration in atopic dermatitis (AD). Genome-wide association studies on AD have revealed other susceptibility genes, for example, Ovo-like 1 (OVOL1). Nonetheless, the relation between FLG and OVOL1 is unclear. Because aryl hydrocarbon receptor (AHR; a ligand-activated transcription factor), plays a role in FLG expression in keratinocytes, we hypothesized that AHR regulates FLG expression via OVOL1. To demonstrate this mechanism, we analyzed FLG expression in OVOL1-overexpressing or OVOL1-knockdown normal human epidermal keratinocytes (NHEKs). Furthermore, we tested whether AHR activation by 6-formylindolo(3,2-b)carbazole (FICZ), an endogenous AHR ligand, or Glyteer, clinically used soybean tar, upregulates FLG and OVOL1 expression in NHEKs. We found that (1) OVOL1 regulates FLG expression; (2) AHR activation upregulates OVOL1; and (3) AHR activation upregulates FLG via OVOL1. Moreover, nuclear translocation of OVOL1 was less pronounced in AD skin compared with normal skin. IL-4-treated NHEKs, an in vitro AD skin model, also showed inhibition of the OVOL1 nuclear translocation, which was restored by FICZ and Glyteer. Thus, targeting the AHR–OVOL1–FLG axis may provide new therapeutics for AD.
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