Danso Mogbekeloluwa O, Berkers Tineke, Mieremet Arnout, Hausil Farzia, Bouwstra Joke A
Department of Drug Delivery Technology, Leiden Academic Centre for Drug Research, Leiden University, Leiden, The Netherlands.
Exp Dermatol. 2015 Jan;24(1):48-54. doi: 10.1111/exd.12579. Epub 2014 Dec 8.
In the studies described in this study, we introduce a novel ex vivo human skin barrier repair model. To develop this, we removed the upper layer of the skin, the stratum corneum (SC) by a reproducible cyanoacrylate stripping technique. After stripping the explants, they were cultured in vitro to allow the regeneration of the SC. We selected two culture temperatures 32 °C and 37 °C and a period of either 4 or 8 days. After 8 days of culture, the explant generated SC at a similar thickness compared to native human SC. At 37 °C, the early and late epidermal differentiation programmes were executed comparably to native human skin with the exception of the barrier protein involucrin. At 32 °C, early differentiation was delayed, but the terminal differentiation proteins were expressed as in stripped explants cultured at 37 °C. Regarding the barrier properties, the SC lateral lipid organization was mainly hexagonal in the regenerated SC, whereas the lipids in native human SC adopt a more dense orthorhombic organization. In addition, the ceramide levels were higher in the cultured explants at 32 °C and 37 °C than in native human SC. In conclusion, we selected the stripped ex vivo skin model cultured at 37 °C as a candidate model to study skin barrier repair because epidermal and SC characteristics mimic more closely the native human skin than the ex vivo skin model cultured at 32 °C. Potentially, this model can be used for testing formulations for skin barrier repair.
在本研究中描述的各项研究中,我们引入了一种新型的离体人类皮肤屏障修复模型。为构建此模型,我们通过可重复的氰基丙烯酸酯剥离技术去除皮肤的上层,即角质层(SC)。剥离外植体后,将它们进行体外培养以促使SC再生。我们选择了两个培养温度32°C和37°C以及4天或8天的培养时长。培养8天后,外植体生成的SC厚度与天然人类SC相似。在37°C时,除了屏障蛋白内披蛋白外,早期和晚期表皮分化程序与天然人类皮肤的执行情况相当。在32°C时,早期分化延迟,但终末分化蛋白的表达与在37°C培养的剥离外植体中的表达情况相同。关于屏障特性,再生SC中的SC侧向脂质组织主要为六方结构,而天然人类SC中的脂质呈现更致密的正交结构。此外,在32°C和37°C培养的外植体中的神经酰胺水平高于天然人类SC中的神经酰胺水平。总之,我们选择在37°C培养的剥离离体皮肤模型作为研究皮肤屏障修复的候选模型,因为与在32°C培养的离体皮肤模型相比,其表皮和SC特征更接近天然人类皮肤。该模型有可能用于测试皮肤屏障修复制剂。