Linoleate-enriched diet increases both linoleic acid esterified to omega hydroxy very long chain fatty acids and free ceramides of canine stratum corneum without effect on protein-bound ceramides and skin barrier function.

Arch Dermatol Res. 2018 Jul 11. doi: 10.1007/s00403-018-1845-5. [Epub ahead of print] Popa I1, Watson AL2, Solgadi A3, Butowski C4, Allaway D4, Portoukalian J5. Author information 1 Faculty of Pharmacy, University Paris-Sud, Chatenay-Malabry, France. iuliana.popa@u-psud.fr. 2 Royal Canin SAS, Aimargues, France. 3 UMS 3679 CNRS, Faculty of Pharmacy, University Paris-Sud, Chatenay-Malabry, France. 4 Waltham Centre for Pet Nutrition, Leics, UK. 5 LBTM1 "Fundamental, clinical and therapeutic aspects of the skin barrier function", University of Lyon-1, Lyon, France. Abstract Few studies have investigated the influence of increased amounts of dietary linoleic acid on the epidermal lipid biochemistry and TEWL in healthy subject. The influence of dietary linoleic acid on canine stratum corneum (SC) lipids was studied by feeding two groups of five dogs differential amounts of linoleic acid (LA) for three months. SC was harvested by tape stripping and lipids were analyzed by thin-layer chromatography and mass spectrometry. The dogs that were fed the higher concentration of LA showed high increases in the contents of both linoleic acid and free ceramides in the SC, whereas the protein-bound ceramide content was unchanged. Acylacids that represent the esterified form of linoleic acid in omega hydroxy very long chain fatty acids (ω-OH VLCFA) accounted for most of the elevation of LA, whereas the concentration of the free form was not significantly changed. Corroborating the absence of change in the protein-bound ceramides content of healthy dogs SC, TEWL was nearly unaffected by the linoleic acid-enriched diet. KEYWORDS: Acylacids; Ceramides; Diet; Dogs; Linoleic acid; Stratum corneum PMID: 29995261 DOI: 10.1007/s00403-018-1845-5