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首页> 外文期刊>日本皮膚科学会雑誌 >皮膚の糖脂質とその機能
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皮膚の糖脂質とその機能

机译:皮肤糖脂及其功能

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Keratinocytes biosynthesize glucosylceramides,acylglucosylceramides and sphingomyelins, which are potential precursors of ceramides in stratum corneum. Specificly, acylglucosylceramides are unique components comprised of both very long chain fatty acids as the amide-linked fatty acids and as esterified fatty acid linked through the omega-hydroxy group. The one found in the human epidermis consists of two acylglucosylcera-mide groups, one containing sphingenine and the other containing phytosphingosine with a single double bond.The linoleic acid content as ester-linked fatty acids is very high in human epidermis.We named these acylglucosylceramides contain linoleic acid "epidermosides";they are key molecules of the epidermal permeability barrier.Epidermosides are the precursors of acylceramides and co-hydroxy ceramides;the latter are the major components of the corneocyte lipid envelope.Glucosylceramides and sphingomyelins have structural heterogeneities in the ceramide portion. All ceramide species are derived from glucosylceramides,while a fraction of Cer 2 and Cer 5 come from sphingomyelins.
机译:角质形成细胞生物合成葡糖神经酰胺,酰基葡糖神经酰胺和鞘磷脂,它们是角质层中神经酰胺的潜在前体。具体地说,酰基葡糖基神经酰胺是由非常长链的脂肪酸作为酰胺连接的脂肪酸和作为通过ω-羟基连接的酯化的脂肪酸组成的独特组分。人表皮中的一个酰基由两个酰基葡糖基神经酰胺基团组成,一个基团包含鞘氨醇,另一个包含具有单双键的植物鞘氨醇,酯基脂肪酸的亚油酸含量在人的表皮中非常高,我们将其命名为酰基葡萄糖基神经酰胺。含有亚油酸“表皮苷”;它们是表皮通透性屏障的关键分子。上表皮苷是酰基神经酰胺和共羟基神经酰胺的前体;后者是角质细胞脂质包膜的主要成分。葡萄糖基神经酰胺和鞘磷脂在神经酰胺中具有结构异质性一部分。所有的神经酰胺种类均来自葡糖神经酰胺,而Cer 2和Cer 5的一部分来自鞘磷脂。

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