The Sphingosine and Acyl Chains of Ceramide [NS] Show Very Different Structure and Dynamics That Challenge Our Understanding of the Skin Barrier.

The Sphingosine and Acyl Chains of Ceramide [NS] Show Very Different Structure and Dynamics That Challenge Our Understanding of the Skin Barrier.
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DOI:
10.1002/anie.202003375
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发表时间:
2020-09-28
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Vávrová K
Vávrová K
中科院分区:
其他
文献类型:
--
作者:
Engberg O;Kováčik A;Pullmannová P;Juhaščik M;Opálka L;Huster D;Vávrová K

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The lipid phase of the uppermost human skin layer is thought to comprise highly rigid lipids in an orthorhombic phase state to protect the body against the environment. By synthesizing sphingosine‐d28 deuterated N‐lignoceroyl‐d‐erythro‐sphingosine (ceramide [NS]), we compare the structure and dynamics of both chains of that lipid in biologically relevant mixtures using X‐ray diffraction, 2H NMR analysis, and infrared spectroscopy. Our results reveal a substantial fraction of sphingosine chains in a fluid and dynamic phase state at physiological temperature. These findings prompt revision of our current understanding of the skin lipid barrier, where an extended ceramide [NS] conformation is preferred and a possible domain structure is proposed. Mobile lipid chains may be crucial for skin elasticity and the translocation of physiologically important molecules. Dynamic chains in a rigid matrix: While the sphingosine chains of ceramide molecules in the outermost human skin layer were originally assumed to be fully rigid, spectroscopic data reveals that they display a complex dynamic behavior. These new insights will help fine‐tune the molecular model of the skin lipid barrier.
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