NHE1 Regulates the Stratum Corneum Permeability Barrier Homeostasis

NHE1 Regulates the Stratum Corneum Permeability Barrier Homeostasis
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NHE1 调节角质层渗透屏障稳态

DOI:
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发表时间:
2002
影响因子:
4.8
通讯作者:
T. Mauro
T. Mauro
中科院分区:
生物学2区
文献类型:
--
作者:
M. Behne;Jamie W. Meyer;K. M. Hanson;N. Barry;S. Murata;D. Crumrine;Robert W. Clegg;E. Gratton;W. Holleran;P. Elias;T. Mauro

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最外层的表皮层,角质层(SC),表现出酸性的表面pH值,而在其底部的pH值接近中性。NHE 1是角质形成细胞和表皮中唯一的Na+/H+逆向转运蛋白亚型,并已被证明可以调节细胞内pH值。我们现在证明了NHE 1的一种新功能,因为我们发现它还控制SC中细胞外“微区”的酸化,这些微区对于激活pH敏感酶和形成表皮渗透屏障至关重要。表皮中的NHE 1表达在颗粒细胞层中最为明显,尽管使用常规pH测量法,NHE 1敲除小鼠的表面pH仅比正常情况略偏碱性,但更灵敏的方法,荧光寿命成像,表明NHE 1 −/−动物表面和较低SC的酸性细胞间结构域消失。荧光寿命成像研究还表明,SC酸化不发生通过一个统一的梯度,但通过逐步积累的酸性微区。这些发现不仅可视化SC pH梯度的空间分布,而且还证明了NHE 1在下部SC的酸性胞外结构域的产生中的作用,从而提供了脂质加工和屏障稳态所必需的深层SC间隙的酸化。
The outermost epidermal layer, the stratum corneum (SC), exhibits an acidic surface pH, whereas the pH at its base approaches neutrality. NHE1 is the only Na+/H+ antiporter isoform in keratinocytes and epidermis, and has been shown to regulate intracellular pH. We now demonstrate a novel function for NHE1, as we find that it also controls acidification of extracellular “microdomains” in the SC that are essential for activation of pH-sensitive enzymes and the formation of the epidermal permeability barrier. NHE1 expression in epidermis is most pronounced in granular cell layers, and although the surface pH of NHE1 knockout mice is only slightly more alkaline than normal using conventional pH measurements, a more sensitive method, fluorescence lifetime imaging, demonstrates that the acidic intercellular domains at the surface and of the lower SC disappear in NHE1 −/− animals. Fluorescence lifetime imaging studies also reveal that SC acidification does not occur through a uniform gradient, but through the progressive accumulation of acidic microdomains. These findings not only visualize the spatial distribution of the SC pH gradient, but also demonstrate a role for NHE1 in the generation of acidic extracellular domains of the lower SC, thus providing the acidification of deep SC interstices necessary for lipid processing and barrier homeostasis.
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