Journal of Radiation Protection and Research

The Korean Association for Radiation Protection (대한방사선방어학회)
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The Effect of Bu-Zhong-Yi-Qi-Tang on Epidermal Melanocytes in Ultraviolet B-irradiated Mice

마우스에서 보중익기탕이 자외선 B 조사에 의한 표피멜라닌세포 변화에 미치는 영향

  • Lee, Hae-June (Korea Institute of Radiological & Medical Science) ;
  • Kim, Hwan-Sung (College of Veterinary Medicine, Chonnam National University) ;
  • Park, Young-Jong (College of Veterinary Medicine, Chonnam National University) ;
  • Kim, Joong-Sun (College of Veterinary Medicine, Chonnam National University) ;
  • Moon, Chang-Jong (College of Veterinary Medicine, Chonnam National University) ;
  • Kim, Jong-Choon (College of Veterinary Medicine, Chonnam National University) ;
  • Bae, Chun-Sik (College of Veterinary Medicine, Chonnam National University) ;
  • Jo, Sung-Kee (Advanced Radiation Technology Institute, KAERI) ;
  • Kim, Sung-Ho (College of Veterinary Medicine, Chonnam National University)
  • Published : 2008.09.30
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Abstract

We induced the activation of melanocytes in the epidermis of C57BL/6 mice by ultraviolet B (UVB) irradiation and observed the effect of Bu-Zhong-Yi-Qi-Tang (BZYQT) on the formation, and decrease of UVB-induced epidermal melanocytes. C57BL/6 mice were irradiated by UVB $80\;mJ/cm^2$ (0.5 mW/sec) daily for 7 days, and BZYQT was intraperitoneally or topically applied pre- or post-irradiation. For the estimation of change of epidermal melanocytes, light microscopic observation with dihydroxyphenylalanine (DOPA) stain was performed. Split epidermal sheets prepared from the ear of untreated mice exhibited 11-16 melanocytes/$mm^2$, and one week after UV irradiation, the applied areas show an increased number of strongly DOPA-positive melanocytes with stout dendrites. But intraperitoneal or topical treatment with BZYQT before each irradiation interrupted UVB-induced pigmentation and resulted in a marked reduction in the number of epidermal melanocytes as compared to radiation control skin. The number and size of DOPA-positive epidermal melanocytes were also significantly decreased in intraperitoneally injected or topically applicated group after irradiation with BZYQT at 3rd and 6th weeks after irradiation. The present study suggests the BZYQT as inhibitor of UVB-induced pigmentation and depigmenting agent.

C57BL/6 마우스에서 자외선(Ultraviolet, UV) B 조사에 의한 표피 멜라닌세포의 변화에 대한 보중익기탕(Bu-Zhong-Yi-Qi-Tang, BZYQT)의 효과를 관찰하였다. 마우스에 UVB를 매일 $80\;mJ/cm^2$ (0.5 mW/sec)씩 7일간 조사하고, BZYQT를 UV 조사전 또는 조사 후에 복강내주사 또는 피부에 도포하여, 멜라닌세포 형성 억제효과 및 형성된 멜라닌세포에 대한 미백 효과를 dihydroxyphenylalanine (DOPA) 염색으로 관찰하였다. 마우스의 귀등쪽 표피를 분리하여 관찰한바, 정상대조군에서는 $mm^2$ 당 11-16개의 멜라닌세포가 관찰되었으며, UV 조사 일주일 후 발달된 가지를 가진 DOPA양성 멜라닌세포는 급격히 증가하였다. 멜라닌세포 형성 억제 실험에서는 평균치를 기준으로 복강 내 주사군에서 16.3%, 피부도포군에서 26.6%(p<0.01)의 효과가 관찰되었으며, 형성된 멜라닌세포의 감소 효과 실험에서는 평균치를 기준으로 복강 내 주사군의 경우 3주에 24.0%(p<0.01), 6주에 26.0%(p<0.01)의 효과가 관찰되었고, 피부도포군의 경우 3주에 5.2%, 6주에 12.5%(p<0.05)의 효과를 보였다. 이상의 결과는 BZYQT가 UV에 의한 멜라닌세포 형성 억제제 및 미백제로서의 적용 가능성을 제시하였다.

Keywords

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