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실크 단백질의 식이 공급이 아토피 피부염 동물 모델 NC/Nga Mice 표피의 스핑고이드 베이스 및인산화물 함량 변화에 미치는 영향
김영애(Kim Youngae),송은화(Song Eun-hwa),신경오(Shin Kyoungoh),이용문(Lee Yongmoon),조윤희(Cho Yunhi) 韓國營養學會 2012 Journal of Nutrition and Health Vol.45 No.2
In our previous studies, dietary supplements of silk protein, sericin, and fibroin, were beneficial for improving epidermal levels of ceramides, which are the major lipids for maintaining the epidermal barrier. In this study, we investigated the dietary effects of silk protein on epidermal levels of free sphingoid bases and their phosphates such as C18 sphingosine (So), C18 sphinganine (Sa), C18 sphingosine-1-phosphate (S1P), and C18 sphinganine-1-phosphate (Sa1P), which are either synthetic substrate or degradative metabolites of ceramides. Forty-five male NC/Nga mice, an animal model of atopic dermatitis (AD), were divided into three groups: group CA was an atopic control and fed a control diet, group S was fed a 1% sericin diet, and group F was fed a 1% fibroin diet. Fifteen male BALB/c mice served as group C (control group) and were fed the control diet. All mice were fed with diets and water ad libitum for 10 weeks. Sa in group CA was lower than that in group C, but So in group CA was similar to that in group C. So and Sa were higher in groups S and F than those in group CA; So level was even higher than that in group C, and Sa level was similar to that of group C. The So/Sa ratio in group CA, which is reported to increase in AD, was significantly higher than that of group C. The So/Sa ratio was lower in groups S and F than that in group CA, and decreased further in group F. However, S1P and Sa1P in groups S and F were similar to those in group CA. Taken together, we demonstrated that silk protein, sericin and fibroin dietary supplements, increased So and Sa levels, and decreased the So/Sa ratio. (Korean J Nutr 2012; 45(2): 113 ~ 120)
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