Abstract
Ceramide (CER), an important component of the extracellular lamellar lipids in the stratum corneum (SC), plays a critical role in maintaining the cutaneous barrier function. This study aimed to determine whether the quantity of free extractable SC CERs in dogs was affected by the age, sex, or breed. Fifty-eight dogs from the breeds Shiba Inu, beagle, miniature dachshund, shih tzu, and golden retriever, without any history of skin problems, were enrolled in this study. Lipid extracts from the SC were subjected to high-performance thin-layer chromatography to quantify the free extractable CERs. There were weak negative correlations between the age and the amount of free extractable CERs, CER [NP] (non-hydroxy fatty acids linked to phytosphingosines), CER [AS/NH] (α-hydroxy fatty acids linked to sphingosines/non-hydroxy fatty acids linked to 6-hydroxysphingosines), and CER [AP] (α-hydroxy fatty acids and phytosphingosines). There were no significant sex- or breed-related differences in the amounts of free extractable SC CERs in the dogs. These findings imply that aging causes a decline in the amount of free extractable SC CERs in dogs, similar to that observed in humans. The sex or breed of the dogs investigated in this study did not influence the amount of free extractable SC CERs.
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This work was supported by a Grant-in-Aid for Scientific Research (KAKENHI) from Japan Society for the Promotion of Science with grant number JP25292179. This work was also funded by Kao cooperation.
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All authors have made considerable contributions to this work. Conceptualization: Toshiroh Iwasaki; Methodology: Ji-Seon Yoon, Ako Sasaki; Formal analysis and investigation: Ji-Seon Yoon, Ako Sasaki, Kenichiroh Shimada, Koji Nishifuji; Writing—original draft preparation: Ji-Seon Yoon, Koji Nishifuji; Writing – review and editing: Ji-Seon Yoon, Ako Sasaki, Kenichiroh Shimada, Kaori Ide, Toshiroh Iwasaki, Koji Nishifuji.
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Institutional animal ethics guidelines were followed for the experiments. Study animals were subjected to minimum stress. The Animal Research Committee of the Tokyo University of Agriculture and Technology approved the animal experiments (No. 21–21).
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Yoon, JS., Sasaki, A., Shimada, K. et al. Effects of age, sex, and breed on the composition of free extractable ceramides in the stratum corneum of healthy dogs. Vet Res Commun 46, 121–126 (2022). https://doi.org/10.1007/s11259-021-09835-x
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DOI: https://doi.org/10.1007/s11259-021-09835-x