Membrane models of the stratum corneum (SC) lipid barrier, either healthy or affected by recessive X-linked ichthyosis, constructed from ceramide [Cer; nonhydroxyacyl sphingosine N-tetracosanoyl-d-erythro-sphingosine (CerNS24) alone or with omega-O-acylceramide N-(32-linoleyloxy)dotriacontanoyl-d-erythro-sphingosine (CerEOS)], FFAs(C16-24), cholesterol (Chol), and sodium cholesteryl sulfate (CholS) were investigated. X-ray diffraction (XRD) revealed a previously unreported polymorphism of the membranes. In the absence of CerEOS, the membranes formed a short lamellar phase (SLP; the repeat distance d = 5.3 nm), a medium lamellar phase (MLP; d = 10.6 nm), or very long lamellar phases (VLLP; d = 15.9 and 21.2 nm). An increased CholS-to-Chol ratio modulated the membrane polymorphism, although the CholS phase separated at ≥ 7 weight% (of total lipids). The presence of CerEOS led to the stable long lamellar phase (LLP) with d = 12.2 nm and prevented VLLP formation. Our XRD results agree well with recently published cryo-electron microscopy data for vitreous skin sections, while also revealing new structures. Thus, lamellar phases with long repeat distances (MLP and VLLP) may be formed in the absence of omega-O-acylceramide, whereas these ultralong Cer species likely stabilize the final SC lipid architecture of LLP by riveting the adjacent lipid layers.

Frank Laboratory of Neutron Physics Joint Institute for Nuclear Research Dubna 141980 Russia

Frank Laboratory of Neutron Physics Joint Institute for Nuclear Research Dubna 141980 Russia; Department of Physical Chemistry of Drugs Faculty of Pharmacy Comenius University in Bratislava 832 32 Bratislava Slovak Republic

Skin Barrier Research Group Faculty of Pharmacy in Hradec Králové Charles University 500 05 Hradec Králové Czech Republic

Skin Barrier Research Group Faculty of Pharmacy in Hradec Králové Charles University 500 05 Hradec Králové Czech Republic; University of Chemistry and Technology Prague 166 28 Prague Czech Republic

University of Chemistry and Technology Prague 166 28 Prague Czech Republic

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