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Anti Photoaging Effects of Hyaluronic Acid following Oral Administration in SKH-1 Hairless Mice

SKH-1 Hairless Mice에서의 히알루론산 경구 투여를 통한 피부 광노화 개선 효과

  • Received : 2015.10.27
  • Accepted : 2015.11.26
  • Published : 2015.12.31

Abstract

Photoaging is the main extrinsic aging factor that is induced due to UVB. Many studies have revealed that application of hyaluronic acid to the skin is effective in healing photoaging. However, the effect of hyaluronic acid through oral administration is unclear. The aim of this research was to investigate the effect on skin photoaging after oral administration of hyaluronic acid. During a ten week study, hyaluronic acid was fed to hairless mice, which were illuminated by UV radiation. After ten weeks, wrinkle indicator and histological changes were determined. Compared with the control group, the sample group had a decrease in wrinkle depth, thickness, and number. Especially, the HA 160 mg/kg group had a similar value of wrinkle depth ($19.44{\pm}0.75{\mu}m$), number ($654.00{\pm}98.34$), and thickness ($1.35{\pm}0.08mm$), when compared with the RA (retinoic acid) group ($19.28{\pm}0.95{\mu}m$, $653.57{\pm}83.54$, and $1.34{\pm}0.07mm$ respectively). Also, the treated group showed improved elastosis and decreased collagen degradation resulting from UV irradiation. Thus, we can conclude that hyaluronic acid has a positive effect in improving skin photoaging induced by UV radiation. Hyaluronic acid therefore has the potential to be an ingredient in skin health function foods.

본 연구에서는 HA에 대하여 UVB로 주름을 유도시킨 hairless mice에게 경구 투여를 하였을 때, 주름 개선에 미치는 영향을 관찰하였다. 쥐는 UV를 쪼여 광노화를 진행하였으며, HA는 UVB에 노출시키기 4주 전부터 투여하여 총 14주 동안 투여하였다. 주름 개선 평가는 replica 제작하여 주름의 길이, 깊이, 개수, 두께로 평가하였다. 또한, 피부의 조직학적 평가를 통해 진피층 내 교원섬유와 탄력섬유의 양과 형태를 관찰하였다. 10주 동안의 HA를 급여하였을 때 주름의 깊이, 두께, 개수를 측정한 주름 개선 평가에서 세 항목 모두 개선되는 결과를 보였다. 특히 HA의 160 mg/kg 농도에서는 주름의 깊이는 $19.44{\pm}0.75{\mu}m$, 주름 수는 $654.00{\pm}98.34$, 주름두께는 $1.35{\pm}0.08mm$로 양성 대조군(RA)의 결과(주름깊이; $19.28{\pm}0.95{\mu}m$, 주름 수; $953.57{\pm}83.54$, 주름두께; $1.34{\pm}0.07mm$)와 비슷한 수치를 나타내며, 우수한 피부 광노화 개선효과를 보였다. 하지만, 주름길이의 결과에서는 유의적 차이를 나타내지 않았다. HA의 섭취로 인한 교원섬유 및 탄력섬유 염색을 통한 조직학적 평가에서는 UV에 의해 밀도가 엉성하고 배열이 불규칙적이던 섬유들이 개선된 것을 관찰할 수 있었다. 이상의 결과로 보아 HA를 경구 투여 시 UV로부터 유도된 광노화 억제 및 피부주름 개선에 효능이 있음을 확인하였다.

Keywords

References

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