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Protective Effects of Bifidobacterium bifidum Culture Supernatants and Intracellular Cell-Free Extracts on Human Dermal Fibroblasts against UV-B Irradiation

인간 진피섬유아세포에서 Bifidobacterium bifidum 배양액 및 추출액의 자외선B에 대한 보호 효능

  • Gwon, Gi Yeong (Department of Food and Bioengineering, Gachon University) ;
  • Park, Gwi Gun (Department of Food and Bioengineering, Gachon University)
  • 권기영 (가천대학교 식품생명공학과) ;
  • 박귀근 (가천대학교 식품생명공학과)
  • Received : 2017.03.31
  • Accepted : 2017.06.26
  • Published : 2017.07.31

Abstract

The present study investigated the protective effects of Bifidobacterium bifidum culture supernatants (BbSC) and intracellular cell-free extracts (BbICFE) on human dermal fibroblasts (HDFs) against ultraviolet-B (UV-B) irradiation. HDFs were treated with UV-B, UV-B+BbCS, and UV-B+BbICFE. Treatment of UV-B-irradiated HDFs with BbCS and BbICFE significantly increased cell viability compared to UV-B-irradiated HDFs. BbCS treatment reduced senescence in HDFs by approximately 40.0%. Moreover, sub-G1 phase was significantly reduced in BbCS- and BbICFE-treated HDFs (3.3% and 4.5%, respectively). The effect of UV-B on oxidative damage of HDFs was measured by dichlorofluorescin diacetate. Fluorescence intensity significantly increased in UV-B-irradiated HDFs. Inhibition of cellular reactive oxygen species in HDFs treated with 0.01% BbCS was the highest at 34.1%. Levels of p21 and p53 protein expression induced by UV-B irradiation were reduced by treatment with BbCS and BbICFE (47.0% and 35.6%, respectively). These results show that BbCS and BbICFE reduce UV-B-induced cellular senescence and apoptosis in HDFs. Thus, BbCS and BbICFE can be used as potential agents for protection of UV-B-induced skin cell damage.

본 연구는 장내세균 Bifidobacterium bifidum 배양액과 추출액을 사용하여 자외선B를 조사한 인간 진피섬유아세포에서 세포생존율과 세포 노화 및 세포주기의 변화를 살펴봄으로써 자외선B에 의한 세포 보호 효능을 평가하였다. 우선 자외선B를 조사한 결과 광량에 비례하여 HDFs의 생존율이 감소하였으며 $100mJ/cm^2$ 조사 시 67.3%로 떨어졌으나 B. bifidum 배양액과 추출액 처리 후 세포생존율을 증가시켜 자외선B에 대한 보호 효능이 있었다. 그리고 $SA-{\beta}-gal$ activity 변화를 측정한 결과에서 세포 노화율을 감소시켰음을 확인하였다. 또한, propidium iodide staining을 통하여 세포주기상 Sub-G1기 세포 수가 감소하였으므로 apoptosis를 억제하였고 이는 세포주기를 정상화하는 데 긍정적인 영향을 미쳤다. B. bifidum 배양액과 추출액 처리한 결과 세포 내 활성산소종이 감소함에 따라 p53과 p21의 발현을 감소시켰으며, 따라서 이에 본 연구에서 B. bifidum 배양액과 추출액은 UV-B로 인한 손상을 보호하는 효과가 있음을 규명하였다.

Keywords

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