Comparative profiling and comprehensive quantification of stratum corneum ceramides in humans and mice by LC/MS/MS.
J Lipid Res
; 61(6): 884-895, 2020 06.
Article
em En
| MEDLINE
| ID: mdl-32265320
ABSTRACT
Ceramides are the predominant lipids in the stratum corneum (SC) and are crucial components for normal skin barrier function. Although the composition of various ceramide classes in the human SC has been reported, that in mice is still unknown, despite mice being widely used as animal models of skin barrier function. Here, we performed LC/MS/MS analyses using recently available ceramide class standards to measure 25 classes of free ceramides and 5 classes of protein-bound ceramides from human and mouse SC. Phytosphingosine- and 6-hydroxy sphingosine-type ceramides, which both contain an additional hydroxyl group, were abundant in the human SC (35% and 45% of total ceramides, respectively). In contrast, in mice, phytosph-ingosine- and 6-hydroxy sphingosine-type ceramides were present at â¼1% and undetectable levels, respectively, and sphingosine-type ceramides accounted for â¼90%. In humans, ceramides containing α-hydroxy FA were abundant, whereas ceramides containing ß-hydroxy or ω-hydroxy FA were abundant in mice. The hydroxylated ß-carbon in ß-hydroxy ceramides was in the (R) configuration. Genetic knockout of ß-hydroxy acyl-CoA dehydratases in HAP1 cells increased ß-hydroxy ceramide levels, suggesting that ß-hydroxy acyl-CoA, an FA-elongation cycle intermediate in the ER, is a substrate for ß-hydroxy ceramide synthesis. We anticipate that our methods and findings will help to elucidate the role of each ceramide class in skin barrier formation and in the pathogenesis of skin disorders.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ceramidas
/
Cromatografia Líquida
/
Epiderme
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Espectrometria de Massas em Tandem
/
Lipidômica
Tipo de estudo:
Prognostic_studies
Limite:
Animals
/
Humans
Idioma:
En
Revista:
J Lipid Res
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Japão