• 생명과학회지
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• 제24권3호
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• pp.284-289
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• 2014

타이로신은 멜라닌 합성을 조절하는 효소이다. 본 연구에서는 현재까지 미백 효능에 대하여 연구가 진행되지 않은 대나무 중 왕대의 잎 및 대 속 내피 추출물이 유발하는 타이로시나제 활성 및 멜라닌 생성 억제 정도를 조사하였다. 대 잎과 대 속 추출물을 5 mg/ml 농도로 멜라닌 세포에 처리하면 세포의 생존율이 감소하는 것으로 나타났다. 또한 세포독성이 없는 조건의 대 잎과 대 속 추출물을 처리하였을 경우 타이로시나제 활성이 억제되었으며, 멜라닌 생성도 억제되는 것으로 나타났다. 본 연구의 결과를 살펴볼 때 대나무 추출물이 타이로시나제 활성과 발현을 저해함으로써 멜라닌 생성을 억제할 수 있는 후보군으로 가능성이 있는 것으로 생각된다.

• 대한수의학회지
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• 제58권2호
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• pp.65-72
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• 2018

The present study observed the effects of a green tea (Camellia sinensis) flower extract (GTFE) on melanin synthesis in B16-F10 melanoma cells. GTFE exhibited antioxidant activity on 2,2-diphenyl-1-picrylhydrazyl and inhibited mushroom tyrosinase activity in a dose-dependent manner. Furthermore, GTFE significantly diminished ${\alpha}-melanocyte$ stimulating hormone (${\alpha}-MSH$) stimulated cellular melanin content and tyrosinase activity throughout the concentration range evaluated. Based on RNA sequencing analysis, differential gene expression patterns observed in ${\alpha}-MSH$ stimulated B16-F10 melanoma cells were normalized by the addition of GTFE. In particular, the expression levels of melanoregulin and tyrosinase genes which are key regulating genes in melanin synthesis were up-regulated by 3.5 and 3 fold respectively by ${\alpha}-MSH$, and were normalized to control levels by the addition of GTFE. The results suggest that GTFE inhibits melanin synthesis in ${\alpha}-MSH$ stimulated B16-F10 melanoma cells by normalizing expression of genes that are essential for melanin synthesis. Overall, the results suggest that GTFE could be applied in the development of a whitening agent for the treatment of dermal hyperpigmentation.

• 한국응용과학기술학회지
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• 제33권4호
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• pp.706-716
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• 2016

본 연구에서는 게나 새우의 껍데기에서 추출된 키틴을 탈아세틸화 하여 얻은 NAG를 화장품 원료로서 적용하고자 하였다. NAG와 GLC를 비교하기 위하여 피부세포에 대한 세포독성, 항염증, 멜라닌 생합성 억제능에 미치는 영향을 확인하고, 피부에 적용하였을 때 멜라닌과 홍반변화의 효과를 측정하였다. 연구 결과 Raw 264.7세포와 B16F10세포에 대해 유의한 세포독성을 나타나지 않았으며, Raw 264.7세포에서 LPS에 의해 유도된 NO 생성 항염증 저해효과는 미비 하였고, NAG는 B16F10세포에 ${\alpha}$-MSH로 멜라닌 생성을 유도한 후 멜라닌 생합성 억제능을 측정한 결과 멜라닌의 생성 증가를 농도 의존적으로 억제되는 것을 확인하였다. 이와 같은 결과로 NAG가 함유된 크림을 만들어 피부에 적용하였을 때 멜라닌 지수, 홍반지수의 감소가 통계적으로 유의미한 변화를 보여 NAG 함유 화장품이 피부미백개선을 위한 기능성화장품으로 활용 가능성을 확인할 수 있었다.

• 대한화장품학회지
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• 제31권1호
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• pp.115-119
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• 2005

제주에서 자생하는 식물들의 미백활성을 B16F10 세포에서의 멜라닌 생성 억제, mushroom tyrosinase 활성 억제 실험을 통하여 확인하였다. 본 실험에서 우리는 개민들레 줄기, 까마중, 미국미역취, 돌외, 주목의 메탄을 추출물에서 B16F10 세포에서의 멜라닌 생성 저해 효과를 확인하였다. 그러나 이들의 tyrosinase 활성은 없었다.

• 한방안이비인후피부과학회지
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• 제17권1호
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• pp.94-103
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• 2004

Objective: This study was performed to detennine the depigmenting effects of Kamibongpungtongsung-San. Methods: To determine the depigmenting effects of Kamibangpungtongsung-San. we measured the degree of tyrosinase inhibition, melanin production & cell viability in cultured B16 melanoma cells, UV screen and cytoprotective effects on PC12 cells injured by hydrogen peroxide. Results: Komibangpungtongsung-San did not show inhibitory effects on melanin production in melanoma cells, UV screen and cytoprotective effects on PC12 cells injured by hydrogen peroxide. However it showed mild inhibitory effects on tyrosinase activity. Conclusion : This study shows that Kamibangpungtongsung-San, a generally used prescription for dermatologic diseases, do not have depigmenting effects via tyrosinase inhibition. Therefore, the depigmenting effect and mechanism of depigmentation by Kamibangpungtongsung-San need to be evaluated and investigated in other directions.

• 대한화장품학회지
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• 제32권1호
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• pp.23-28
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• 2006

본 연구는 택사의 화장품 원료로서의 특성을 알아보기 위하여 화장품의 기능들인 항산화, 미백, 세포 손상 회복 및 항염증과 관련된 다양한 실험을 실시하였다. 30, 70, 100% MeOH 용매로 추출한 택사 추출물들은 DPPH법으로 실시한 free radical scavenging assay에서 좋은 활성을 보여주었고, tyrosinase 활성 억제 시험에서도 0.5% 이상의 농도에서 농도 의존적인 활성을 보여주었다. Human fibroblast를 사용한 proliferation assay (MTT assay)에서 각 용매 추출물들은 별다른 효과를 보여주지 못했고 0.05% 이하의 농도에서는 세포 독성으로부터 안전하다는 것을 알 수 있었다. Bl6 melanocyte를 사용한 melanin 생성 억제시험에서 각 용매별 추출물은 독성으로부터 안전한 0.05% 이하의 농도에서 melanin 생성을 40% 이상 억제하는 높은 활성을 보여주었다. 이후 우리는 택사 추출물의 MPLC분리 분획을 실시하여 세 가지 분획을 얻었으며 이들을 대상으로 세포 손상 회복시험과 melanin생성 억제 시험, 염증인자 생성 억제 시험을 실시하였다. 그 결과 분획물들 중 3번 분획물이 세포 손상 회복을 30% 이상 올려주는 좋은 결과를 보여주었고, melanin 생성 억제 시험과 COX-2 생성억제에서도 주목할만한 결과를 보여주었다.

• 한방안이비인후피부과학회지
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• 제20권3호
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• pp.1-13
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• 2007

Objective : This study was performed to assess the whitening effect of Bombysis Corpus on melanin synthesis. Methods : The whitening effects of Bombysis Corpus were examined by in vitro melanin production assay. We assessed inhibitory effects of Bombysis Corpus on melanin-release from B16F10, on melanin production in B16F10, on mushroom tyrosinase activity in vitro, on tyrosinase activity in B16F10, effect of Bombysis Corpus on the expression tyrosinase, TRP-1, PKA, ERK-1 ERK-2, AKT-1, MITF in B16F10. Results : 1. Bombysis Corpus inhibited melanin-release, melanin production in B16F10. 2. Bombysis Corpus inhibited tyrosinase activity in vitro and in B16F10. 3. Bombysis Corpus suppressed the expression of tyrosinase, TRP-1 in B16F10. 4. Bombysis Corpus suppressed the expression of PKA in B16F10. 5. Bombysis Corpus suppressed the expression of ERK-1, ERK-2, AKT-1 in B16F10. 6. Bombysis Corpus suppressed the expression of MITF in B16F10. Conclusion : The study shows that Bombysis Corpus inhibited melanin production on the melanogenesis.

• Journal of Microbiology and Biotechnology
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• 제20권11호
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• pp.1513-1520
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• 2010

A bacterium capable of producing melanin pigment in the presence of L-tyrosine was isolated from a crop field soil sample and identified as Klebsiella sp. GSK based on morphological, biochemical, and 16S rDNA sequencing. The polymerization of this pigment occurs outside the cell wall, which has a granular structure as melanin ghosts. Chemical characterization of the pigment particles showed then to be acid resistant, alkali soluble, and insoluble in most of the organic solvents and water. The pigment got bleached when subjected to the action of oxidants as well as reductants. This pigment was precipitated with $FeCl_3$, ammoniacal silver nitrate, and potassium ferricynide. The pigment showed high absorbance in the UV region and decreased absorbance when shifted towards the visible region. The melanin pigment was further charecterized by FT-IR and EPR spectroscopies. A key enzyme, 4-hydroxyphenylacetic acid hydroxylase, that catalyzes the formation of melanin pigment by hydroxylation of L-tyrosine was detected in this bacterium. Inhibition studies with specific inhibitors, kojic acid and KCN, proved that melanin is synthesized by the DOPA-melanin pathway.

• Journal of Microbiology and Biotechnology
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• 제30권7호
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• pp.1051-1059
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• 2020

Overproduction and accumulation of melanin in the skin will darken the skin and cause skin disorders. So far, components that can inhibit tyrosinase, a melanin synthase of melanocytes, have been developed and used as ingredients of cosmetics or pharmaceutical products. However, most of existing substances can only inhibit the biosynthesis of melanin while melanin that is already synthesized and deposited is not directly decomposed. Thus, their effects in decreasing melanin concentration in the skin are weak. To overcome the limitation of existing therapeutic agents, we started to develop a substance that could directly biodegrade melanin. We screened traditional fermented food microorganisms for their abilities to direct biodegrade melanin. As a result, we found that a kimchi-derived Pediococcus acidilactici PMC48 had a direct melanin-degrading effect. This PMC48 strain is a new strain, different from P. acidilactici strains reported so far. It not only directly degrades melanin, but also has tyrosinase-inhibiting effect. It has a direct melanin-decomposition effect. It exceeds existing melanin synthesis-inhibiting technology. It is expected to be of high value as a raw material for melanin degradation drugs and cosmetics.

• 한국미생물·생명공학회지
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• 제23권2호
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• pp.209-213
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• 1995

During the screening of inhibitors of melanin biosynthesis from microbial secondary metabolites, a fungal strain MR-93 which was capable of producing high level of an inhibitor was selected from plant leaf. Based on taxonomic studies, the fungus could be classified as a strain of Trichoderma sp.. The active compound (MR-93D) was purified from the culture broth by Diaion HP-20 column chromatography, ethylacetate extraction, Sephadex LH-20 column chromatography and HPLC. The inhibitor was identified as 4-hydroxy-8-isocyano-l-oxaspiro[4-4]cyclonon-8-en-2- one by spectroscopic methods of UV, $^{1}$H-NMR, ESIMS and IR. MR-93D showed a strong tyrosinase inhibitory activity with 0.03 $\mu$g/m of IC$_{50}$ value. It also inhibited melanin biosynthesis with 35 mm inhibition zone at 30 $\mu$g/paper disc in Streptomyces bikiniensis, a bacterium used as an indicator organism in this work.