Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Dietary Effect of Silk Protein on Ceramide Synthesis and the Expression of Ceramide Metabolic Enzymes in the Epidermis of NC/Nga Mice

실크단백질의 식이 공급이 아토피 피부염 동물 모델 NC/Nga Mice 피부의 세라마이드 함량 및 관련인자 발현에 미치는 영향

  • Park, Kyung-Ho (Dept. of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University) ;
  • Choi, Young-Sim (Dept. of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University) ;
  • Kim, Hyun-Ae (Dept. of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University) ;
  • Lee, Kwang-Gill (Dept. of Agricultural Biology, National Institute of Agricultural Science and Technology) ;
  • Yeo, Joo-Hong (Dept. of Agricultural Biology, National Institute of Agricultural Science and Technology) ;
  • Jung, Do-Hyun (Nutrex Co., Ltd.) ;
  • Kim, Sung-Han (Nutrex Co., Ltd.) ;
  • Cho, Yun-Hi (Dept. of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University)
  • 박경호 (경희대학교 동서의학대학원 의학영양학과) ;
  • 최영심 (경희대학교 동서의학대학원 의학영양학과) ;
  • 김현애 (경희대학교 동서의학대학원 의학영양학과) ;
  • 이광길 (농촌진흥청 농업생물부) ;
  • 여주홍 (농촌진흥청 농업생물부) ;
  • 정도현 ((주)뉴트렉스) ;
  • 김성한 ((주)뉴트렉스) ;
  • 조윤희 (경희대학교 동서의학대학원 의학영양학과)
  • Published : 2007.05.30
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Abstract

Ceramide rich intercellular lipid lamellae are thought to be particularly important in maintaining the structural integrity of epidermal barrier. Ceramide is synthesized de novo by serine palmitoyltransferase (SPT) phospholipid intermediates, serine and palmitic acid persist within the stratum corneum. The ceramide which is synthesized is degraded with fatty acid and sphingosine by degradative enzyme ceramidase. The depletion of ceramide in stratum corneum was reported in the atopic dermatitis. As an effort to search for the dietary source for improving the level of ceramide in epidermis, the dietary effects of various-typed silk protein were compared. Seventy male NC/Nga mice, an animal model of atopic dermatitis, were divided into seven groups: group CA as an atopic control with control diet, group S: 1% crude sericin diet, group F: 1% crude fibroin diet, group PS : peptide pattern of sericin(Mw 5000), group PF: peptide pattern of fibroin (Mw 1500), group AS: manufactured the same as amino acid profile of sericin and group AF: manufactured the same as amino acid profile of fibroin. Ten male BALB/c mice were served as group C (control group) control diet. All mice were fed on diet and water ad libitum for 10 weeks. Dry skin condition was established in group CA as ceramide content was decreased. Despite a marked decrease of mRNA and prorein expression of SPT, enzyme do novo synthesis, ceramide content of group S was dramatically increased by inhibiting the mRNA and protein expression of degradative enzyme ceramidase. However, dietary supplementation of crude silk fibroin protein (group F) and in other groups that were supplemented with either amino acid or peptide type of sericin or fibroin did not increase the level of ceramide. Together, our data demonstrate that dietary supplementation of crude sericin is more effective at improving ceramide level in epidemis of NC/Nga mice.

본 연구에서는 아토피 피부염 동물 모델인 NC/Nga mice에 실크단백질 sericin과 fibroin을 식이 공급 후 피부의 세라마이드 함량 및 관련인자 발현 변화를 정상대조군인 BALB/c mice 및 아토피 피부염 대조군과 비교 분석하였다. 세라마이드 함량은 아토피 대조군인 CA군이 정상대조군 C군보다 현저히 낮았으나, 정제된 건조 분말을 별다른 처리 없이 그대로 실크단백질 sericin을 식이공급한 S군은 정상대조군인 C군 이상의 수준으로 높였으며, 실크단백질 fibroin(F군)은 세라마이드 함량을 정상대조군 수준이상으로 올려주지는 못하였다. 세라마이드 합성효소인 SPT의 mRNA 및 protein 발현은 아토피 대조군인 CA군은 정상대조군인 C군보다 높았으나, 실크단백질 공급군인 S군 및 F군은 모두 정상대조군 C군보다 현저히 낮았다. 반면, 세라마이드 분해효소인 ceramidase의 mRNA 및 protein 발현은 아토피 대조군인 CA군은 정상대조군인 C군보다 높았으나, 실크단백질을 식이섭취한 S군 및 F군에서는 정상대조군인 C군과 유사한 수준으로 CA군에 비해서는 유의적으로 낮았다. 결론적으로 실크단백질 sericin의 10주간 식이섭취는 아토피 피부염 동물모델 NC/Nga mice 표피의 세라마이드 함량을 정상대조군 수준 이상으로 증가시켰으며, 궁극적으로 표피의 장벽기능을 정상대조군의 수준으로 변화시켰다. 이는 serine이 다량 함유되어있는 실크단백질 sericin을 공급에 의해 증가되었는데, serine은 그 자체로서 보습기능을 하여 표피의 장벽기능을 보완하였기 때문에 SPT에 의한 생합성은 불필요하였으며 또한, ceramidase에 의한 세라마이드 분해를 정상수준이하로 억제하여 세라마이드의 생성보다는 분해억제에 의한 것으로 여겨진다.

Keywords

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