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The Dietary Effect of Royal Jelly Supplementation on Epidermal Levels of Filaggrin and Free Amino Acids during Menopause in Rats

폐경기 노화 유도 전후의 로얄제리 식이공급이 백서 표피의 필라그린과 유리아미노산 함량 및 관련 대사 효소의 단백질 발현 변화에 미치는 영향

  • Kim, Yeaji (Dept. of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University) ;
  • Han, Sang-Mi (Dept. of Agricultural Biology, National Institute of Agricultural Science and Technology) ;
  • Cho, Yunhi (Dept. of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University)
  • 김예지 (경희대학교 동서의학대학원 의학영양학과) ;
  • 한상미 (농촌진흥청 농업생물부) ;
  • 조윤희 (경희대학교 동서의학대학원 의학영양학과)
  • Received : 2012.11.06
  • Accepted : 2013.01.29
  • Published : 2013.03.31

Abstract

Epidermal hydration is mainly maintained by natural moisturizing factors (NMFs). Of these various NMFs, free amino acids (AAs) are major constituents generated by filaggrin degradation. The reduction of these AAs has been reported in aging skin induced during menopause. In this study, we examined whether the dietary supplementation of royal jelly (RJ) during the pre- and post-menopausal period alters epidermal levels of filaggrins, free AAs, and peptidylarginine deiminase-3 (PAD-3) (an enzyme involved in filaggrin degradation processes). Sprague Dawley rats were divided into five groups: groups fed a control diet for 12 weeks, in which an ovariectomy (OVX) or sham operation (SHAM) were underwent at week 4; groups fed a diet with 1% RJ harvested in different area of Korea (RJ1 and RJ2); and a group fed a diet with isoflavone (IF), the typical functional food for menopause prevention, for 4 weeks before and 8 weeks after an ovariectomy operation. In the epidermis of group OVX, total filaggrins (including profilaggrin and filaggrin) were reduced; these levels in groups RJ1 and IF were similar or less than in group OVX. However, total AAs, which showed no apparent difference between groups SHAM and OVX, were highly increased in groups RJ1 and IF. Specifically, aspartate (Asp) and proline (Pro), the major AAs in functioning NMF, were highly increased in group RJ1. Although total filaggrins, profilaggrin, filaggrin and PAD3 increased, total AAs (including Asp and Pro) in group RJ2 were modest or less than in group RJ1. The PAD3 alteration was not apparent among the four other groups. Taken together, we demonstrate that the diet supplementation of RJ1 enhanced filaggrin degradation (but not through the increased protein expression of PAD3), and increased total AAs, Asp and Pro. RJ1 could be a dietary supplementation for preventing the skin aging induced during menopause.

본 연구에서는 난소절제를 통하여 폐경기가 유도된 백서 모델에서 생산지가 다른 국내산 로얄제리 식이와 이소플라본을 식이로 공급한 후 표피의 필라그린 및 유리아미노산의 함량과 관련 대사 효소의 발현 변화를 정상대조군인 SHAM군 및 난소절제군인 OVX군과 비교 분석하였다. Profilaggrin, filaggrin 및 total filaggrin의 발현은 SHAM군> RJ2군> OVX군=IF군> RJ1군 순으로 RJ1군의 profilaggrin, filaggrin의 발현량이 가장 낮게 나타났다. Profilaggrin에서 filaggrin으로, filaggrin에서 유리아미노산으로의 분해하는 과정에 관여하는 여러 효소 중에 PAD3의 발현은 RJ2군에서 가장 높았으나 SHAM군을 비롯하여 OVX군, RJ1군, IF군에서는 군간 유의성이 없었다. 전체 유리아미노산의 함량은 SHAM군에 비해 OVX군에서 다소 감소하였으나 RJ1군 및 IF군에서 SHAM군보다 높게 나타났다. 특히 RJ1군에서 aspartate와 proline의 함량이 SHAM군에 비해 현저히 높아졌다. 결론적으로 RJ1군에서는 filaggrin의 함량 감소가 있었지만 표피 보습 유지기능이 있는 aspartate 및 proline을 비롯한 전체 유리아미노산의 함량이 높아졌다. RJ1군의 로얄제리가 폐경으로 인해 감소되는 표피의 보습인자 중 궁극적으로 피부 보습에 관여하는 천연보습인자의 유리아미노산의 발현을 증가시켜 손상된 표피의 장벽기능 보완에 긍정적 영향을 보였다. RJ2군은 profilaggrin, filaggrin을 포함한 total filaggrin의 함량이 증가되었으나 그 분해산물인 유리 아미노산의 함량은 SHAM군과 유사하였다. RJ2군의 로얄제리가 유리아미노산의 전구단백질의 발현 증가를 야기하나 유리아미노산으로의 분해는 촉진시키지 못하였음을 시사한다. 이는 산지별 로얄제리의 피부 보습 기능에 미치는 영향이 다르게 나타날 수 있음을 의미하며 추후 각 산지별 유효성분의 분석과 함께 관련 효능에 대한 연구가 이루어질 필요성이 있다. 본 연구에서 국내산 로얄제리의 식이 공급이 피부 보습 관련 건강기능식품 개발 소재로서의 가능성이 있을 것으로 사료된다.

Keywords

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