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자료유형
학술저널
저자정보
Kim, Kun Pyo (Department of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University) Shin, Kyong-Oh (College of Pharmacy and MRC, Chungbuk National University) Park, Kyungho (Department of Dermatology, Northern California Institute for Research and Education [NCIRE]-VA Medical Center, University of California, San Francisco[UCSF]) Yun, Hye Jeong (Department of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University) Mann, Shivtaj (Nova Southeastern College of Medicine, Fort Lauderdale) Lee, Yong Moon (College of Pharmacy and MRC, Chungbuk National University) Cho, Yunhi (Department of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University)
저널정보
한국응용약물학회 Biomolecules & Therapeutics(구 응용약물학회지) Biomolecules & therapeutics 제23권 제6호
발행연도
2015.1
수록면
525 - 530 (6page)

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Ceramide is the most abundant lipid in the epidermis and plays a critical role in maintaining epidermal barrier function. Overall ceramide content in keratinocyte increases in parallel with differentiation, which is initiated by supplementation of calcium and/or vitamin C. However, the role of metabolic enzymes responsible for ceramide generation in response to vitamin C is still unclear. Here, we investigated whether vitamin C alters epidermal ceramide content by regulating the expression and/or activity of its metabolic enzymes. When human keratinocytes were grown in 1.2 mM calcium with vitamin C ($50{\mu}g/ml$) for 11 days, bulk ceramide content significantly increased in conjunction with terminal differentiation of keratinocytes as compared to vehicle controls (1.2 mM calcium alone). Synthesis of the ceramide fractions was enhanced by increased de novo ceramide synthesis pathway via serine palmitoyltransferase and ceramide synthase activations. Moreover, sphingosine-1-phosphate (S1P) hydrolysis pathway by action of S1P phosphatase was also stimulated by vitamin C supplementation, contributing, in part, to enhanced ceramide production. However, activity of sphingomyelinase, a hydrolase enzyme that converts sphingomyelin to ceramide, remained unaltered. Taken together, we demonstrate that vitamin C stimulates ceramide production in keratinocytes by modulating ceramide metabolicrelated enzymes, and as a result, could improve overall epidermal barrier function.

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