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Sphingolipid metabolism during epidermal barrier development in mice
Thomas Doering1, Helmut Brade, Konrad Sandhoff
1Kekulé-Institut für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Strasse 1, D-53121 Bonn, Germany.
Journal of Lipid Research
|October 5, 2002
Summary
During embryonic development, glucosylceramides and specific ceramides are crucial for forming a functional skin barrier in mice. Their levels and localization change, contributing to the stratum corneum
Area of Science:
- Developmental Biology
- Skin Barrier Formation
- Lipid Metabolism
Background:
- A competent skin barrier is essential for preventing water loss and is established shortly before birth in rodents.
- Stratum corneum lipid composition, including ceramides, cholesterol, and fatty acids, is critical for barrier function.
Purpose of the Study:
- To investigate the formation and epidermal localization of glucosylceramides during embryonic skin barrier development in Balb/c mice.
- To analyze changes in ceramide composition during late gestation and their correlation with stratum corneum maturation.
Main Methods:
- Immunohistochemistry was used to detect and localize epidermal glucosylceramides.
- Analysis of ceramide composition in the epidermis during different stages of gestation.
Main Results:
- Epidermal glucosylceramides were minimally detected 3 days before birth, peaking 24 hours later and then decreasing.
- Glucosylceramides localized to the apical side of the outermost granular keratinocytes.
- The composition of epidermal ceramides changed significantly, with a decrease in omega-hydroxylated acylceramides correlating with corneocyte lipid envelope formation.
Conclusions:
- Glucosylceramide dynamics and specific ceramide profiles are integral to embryonic skin barrier development.
- The covalent attachment of ceramides and glucosylceramides to corneocyte surface proteins may enhance stratum corneum resistance.
- These findings provide insights into the molecular mechanisms underlying epidermal barrier maturation.
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