Keratinocyte-derived IL-1β induces PPARG downregulation and PPARD upregulation in human reconstructed epidermis following barrier impairment.

Keratinocyte-derived IL-1β induces PPARG downregulation and PPARD upregulation in human reconstructed epidermis following barrier impairment.
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角质形成细胞衍生的 IL-1β 在屏障损伤后的人重建表皮中诱导 PPARG 下调和 PPARD 上调。

DOI:
10.1111/exd.14323
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发表时间:
2021-09
影响因子:
3.6
通讯作者:
Dubrac S
Dubrac S
中科院分区:
医学2区
文献类型:
--
作者:
Blunder S;Krimbacher T;Moosbrugger-Martinz V;Gruber R;Schmuth M;Dubrac S

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过氧化物酶体增殖物激活受体(PPARs)是核激素受体家族。在皮肤中,PPARs调节炎症、脂质合成、角质形成细胞分化和增殖,因此对于皮肤屏障稳态是重要的。因此,在引起表皮屏障损伤的各种皮肤病症中,即特应性皮炎(AD)和银屑病中,PPAR表达改变。使用人表皮等同物(HEE),我们建立了缺乏免疫细胞的急性表皮屏障损伤模型。我们评估了屏障扰动后的PPAR和细胞因子表达,并检查了角质形成细胞衍生的细胞因子对PPAR表达的影响。我们发现,丙酮或SDS治疗导致表皮屏障功能的分级损害。此外,我们证明,除了IL-1β和TNFα,IL-33和TSLP是急性表皮屏障损伤的高度相关标志物。SDS和丙酮介导的表皮屏障损伤均降低PPARG表达水平,而只有SDS增强PPARD表达。与IL-1β和TNFα处理的HEE中的结果一致,IL-1信号传导的消除恢复了PPARG表达,并限制了SDS诱导的表皮屏障损伤中PPARD表达的增加。因此,表皮屏障扰动后,角质形成细胞衍生的IL-1β和部分TNFα调节PPARG和PPARD表达。这些结果强调了PPARγ和PPARβ/δ在急性表皮屏障损伤中的作用,可能与AD和银屑病等疾病有关。
Peroxisome proliferator‐activated receptors (PPARs) are a family of nuclear hormone receptors. In skin, PPARs modulate inflammation, lipid synthesis, keratinocyte differentiation and proliferation and thus are important for skin barrier homeostasis. Accordingly, PPAR expression is altered in various skin conditions that entail epidermal barrier impairment, that is atopic dermatitis (AD) and psoriasis. Using human epidermal equivalents (HEEs), we established models of acute epidermal barrier impairment devoid of immune cells. We assessed PPAR and cytokine expression after barrier perturbation and examined effects of keratinocyte‐derived cytokines on PPAR expression. We show that acetone or SDS treatment causes graded impairment of epidermal barrier function. Furthermore, we demonstrate that besides IL‐1β and TNFα, IL‐33 and TSLP are highly relevant markers for acute epidermal barrier impairment. Both SDS‐ and acetone‐mediated epidermal barrier impairment reduce PPARG expression levels, whereas only SDS enhances PPARD expression. In line with findings in IL‐1β and TNFα‐treated HEEs, abrogation of IL‐1 signalling restores PPARG expression and limits the increase of PPARD expression in SDS‐induced epidermal barrier impairment. Thus, following epidermal barrier perturbation, keratinocyte‐derived IL‐1β and partly TNFα modulate PPARG and PPARD expression. These results emphasize a role for PPARγ and PPARβ/δ in acute epidermal barrier impairment with possible implications for diseases such as AD and psoriasis.
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