Deuterium NMR investigation of polymorphism in stratum corneum lipids.

Deuterium NMR investigation of polymorphism in stratum corneum lipids.
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角质层脂质多态性的氘核磁共振研究。

DOI:
10.1016/0005-2736(91)90209-q
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发表时间:
1991
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Downing,DT
Downing,DT
中科院分区:
--
文献类型:
--
作者:
Abraham,W;Downing,DT

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角质层细胞间的脂质膜是经皮渗透的主要屏障。氘磁共振和冷冻断裂电子显微镜调查的水合脂质混合物组成的神经酰胺,胆固醇,棕榈酸和胆固醇硫酸酯和近似角质层细胞间脂质成分,揭示热诱导的多态性。随着胆固醇与神经酰胺的比例降低,双层膜向六方膜转变的转变温度降低。其中角质层神经酰胺被合成的二棕榈酰磷脂酰胆碱取代的脂质混合物在本研究中使用的整个温度范围内没有显示出任何多态性。含神经酰胺的样品形成六边形结构的能力为表皮分化的最后阶段角质层细胞间层的组装建立了合理的机制。此外,这些非极性脂质混合物的双层到六边形相变可用于增强药物通过皮肤的渗透。
The intercellular lipid lamellae of stratum corneum constitute the major barrier to percutaneous penetration. Deuterium magnetic resonance and freeze-fracture electron microscopic investigation of hydrated lipid mixtures consisting of ceramides, cholesterol, palmitic acid and cholesteryl sulfate and approximating the stratum corneum intercellular lipid composition, revealed thermally induced polymorphism. The transition temperature of bilayer to hexagonal transition decreased as the ratio of cholesterol to ceramides in these mixtures was lowered. Lipid mixtures in which the stratum corneum ceramides were replaced by synthetic dipalmitoylphosphatidylcholine did not show any polymorphism throughout the temperature range used in the present study. The ability of the ceramide-containing samples to form hexagonal structures establishes a plausible mechanism for the assembly of the stratum corneum intercellular lamellae during the final stages of epidermal differentiation. Also, the bilayer to hexagonal phase transition of these nonpolar lipid mixtures could be used to enhance the penetration of drugs through skin.
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