NHE1 Regulates the Stratum Corneum Permeability Barrier Homeostasis
NHE1 Regulates the Stratum Corneum Permeability Barrier Homeostasis
复制标题
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
中科院分区:
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
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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DOI:
10.1152/ajpcell.1999.276.4.c788
发表时间:
1999-04-01
影响因子:
5.5
作者:
Bell, SM;Schreiner, CM;Scott, WJ
通讯作者:
Scott, WJ
DOI:
10.1046/j.0022-202x.2001.01555.x
发表时间:
2001
期刊:
The Journal of investigative dermatology.
影响因子:
--
作者:
Uchida,Y;Behne,M;Quiec,D;Elias,PM;Holleran,WM
通讯作者:
Holleran,WM
影响因子:
7.4
作者:
SZMACINSKI, H;LAKOWICZ, JR
通讯作者:
LAKOWICZ, JR
DOI:
10.1038/jidsymp.1998.23
发表时间:
1998
期刊:
The journal of investigative dermatology. Symposium proceedings
影响因子:
--
作者:
Turner,NG;Cullander,C;Guy,RH
通讯作者:
Guy,RH
DOI:
10.1159/000211511
发表时间:
1997-07
期刊:
Skin pharmacology : the official journal of the Skin Pharmacology Society
影响因子:
--
作者:
G. Menon;P. Elias
通讯作者:
G. Menon;P. Elias