실크 단백질의 식이 공급이 아토피 피부염 동물 모델 NC/Nga Mice 표피의 스핑고이드 베이스 및 인산화물 함량 변화에 미치는 영향

• Published in: Hanʼguk yongyang hakhoe chi Vol. 45; no. 2; pp. 113 - 120
• Main Authors: 김영애, 송은화, 신경오, 이용문, 조윤희, Kim, Young-Ae, Song, Eun-Hwa, Shin, Kyoung-Oh, Lee, Yong-Moon, Cho, Yun-Hi
• Format: Journal Article
• Language: Korean
• Published: 2012
• Subjects: NC/Nga mice; silk protein; atopic dermatitis; sphingosine; sphinganine
• ISSN: 0367-6463; 2005-7121

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 $C_{18}$ sphingosine (So), $C_{18}$ sphinganine (Sa), $C_{18}$ sphingosine-1-phosphate (S1P), and $C_{18}$ 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.