• Toxicological Research
• /
• 제33권1호
• /
• pp.55-62
• /
• 2017

We evaluated the antioxidant activity and anti-melanogenic effects of Oenothera laciniata methanol extract (OLME) in vitro by using melan-a cells. The total polyphenol and flavonoid content of OLME was 66.3 and 19.0 mg/g, respectively. The electron-donating ability, 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical-scavenging activity, and superoxide dismutase (SOD)-like activity of OLME ($500{\mu}g/mL$) were 94.5%, 95.6%, and 63.6%, respectively. OLME and arbutin treatment at $50{\mu}g/mL$ significantly decreased melanin content by 35.5% and 14.2%, respectively, compared to control (p < 0.05). OLME and arbutin treatment at $50{\mu}g/mL$ significantly inhibited intra-cellular tyrosinase activity by 22.6% and 12.6%, respectively, compared to control (p < 0.05). OLME ($50{\mu}g/mL$) significantly decreased tyrosinase, tyrosinase-related protein-1 (TRP-1), TRP-2, and microphthalmia-associated transcription factor-M (MITF-M) mRNA expression by 57.1%, 67.3%, 99.0%, and 77.0%, respectively, compared to control (p < 0.05). Arbutin ($50{\mu}g/mL$) significantly decreased tyrosinase, TRP-1, and TRP-2 mRNA expression by 24.2%, 42.9%, and 48.5%, respectively, compared to control (p < 0.05). However, arbutin ($50{\mu}g/mL$) did not affect MITF-M mRNA expression. Taken together, OLME showed a good antioxidant activity and anti-melanogenic effect in melan-a cells that was superior to that of arbutin, a well-known skin-whitening agent. The potential mechanism underlying the anti-melanogenic effect of OLME was inhibition of tyrosinase activity and down-regulation of tyrosinase, TRP-1, TRP-2, and MITF-M mRNA expression.

• 동의생리병리학회지
• /
• 제24권2호
• /
• pp.236-241
• /
• 2010

The purpose of this study was to investigate the mechanism of ethanol extract of Agrimonia pilosa Ledeb. (EAP)-reduced melanogenesis and diphenyl-picryl-hydrazyl (DPPH) radical scavenging activity. Agrimonia pilosa Ledeb., a perennial herbaceous plant, has been used as an antihemorrhagic, anthelminntic, and antiinflammatory agents in Chinese herbal medicine. In the present study, we observed that melanin synthesis and tyrosinase activity of B16F10 cells were significantly decreased by EAP. However, EAP could not suppress tyrosinase activity in the cell-free system, whereas kojic acid directly inhibited tyrosinase activity. Furthermore, EAP decreased the protein expression of tyrosinase, tyrosinase-related prootein 1 (TRP-1), and tyrosinase-related prootein 2 (TRP-2). EAP scavenged DPPH radical up to 41% with 100 ${\mu}g/m{\ell}$ concentration. These results suggest that the hypopigmentary effect of EPA was due to regulation of tyrosinase protein.

• 생명과학회지
• /
• 제19권1호
• /
• pp.75-80
• /
• 2009

미역, 다시마 등 갈조류의 추출물로서 생리활성성분으로 각광 받고 있는 fucoidan이 멜라닌 합성에 미치는 영양을 알아봄으로써 미백제로서의 개발 가능성 여부를 확인하지 위하여 B16F10 melnoma 세포를 이용하여 멜라닌 합성과 tyrosmase 활성도에 대한 실험의 결과 B16F10 melnoma 세포의 멜라닌 생성과 tyrosinase 활성도는 fucoidan의 농도가 증가함에 따라 농도 의존적으로 억제되었다. B16F10 melnoma 세포에 ${\alpha}$-MSH를 투여 후 멜라닌 생성과 tyrosinase의 활성도 역시 fucoidan의 농도가 증가할수록 멜라닌 생성과 tyrosmase 활성도가 억제되는 경향을 보였다. 또한 DOPA 염색의 결과 fucoidan은 농도 의존적으로 tyrosinase 활성도를 억제하였다. 이상의 결과 해조 추출 다당류인 furosinase은 B16F10 melanoma 세포의 멜라닌 합성과 tyrosinase 활성도 억제 작용을 나타내므로 미백 활성 물질로서의 가능성을 가지고 있는 것으로 생각된다.

• Journal of Microbiology and Biotechnology
• /
• 제16권12호
• /
• pp.1977-1983
• /
• 2006

Kaempferol was isolated and identified from the methanol extract of the flowers of Impatiens balsamina. Kaempferol showed inhibitory activity against mushroom tyrosinase with an $ID_{50}$ of 0.042 mM. Inhibition kinetics, as determined using a Lineweaver-Burk plot, showed kaempferol to be a competitive inhibitor of mushroom tyrosinase with a $K_i$ value of 0.011 mM. The lag phase of tyrosine hydroxylation catalyzed by mushroom tyrosinase clearly increased on increasing the concentration of kaempferol. In addition to its tyrosinase inhibiting activity, kaempferol strongly inhibited melanin production by Streptomyces bikiniensis, in a dose-dependent manner, without inhibiting cell growth. For comparative purposes, the tyrosinase inhibitory activity of kaempferol was also assayed versus quercetin, a positive standard.

• 한국균학회지
• /
• 제38권2호
• /
• pp.202-204
• /
• 2010

멜라닌 생합성에 관련된 tyrosinase 효소활성의 억제를 측정을 위하여, 큰갓버섯(Macrolepiota procera) 균사체 및 균사체 배양액을 이용하여 실험을 하였다. 배양액의 메탄올 분획이 56.6%의 효소활성 억제를 보여주었으며, 농도 의존적억제 실험에서 50%의 tyrosinase 효소활성 억제 농도는 8.78mg/ml이었다. Streptococcus bikiniensis를 이용한 멜라닌생성 억제는 균사체의 메탄올 추출물에서 94.0%의 우수한 결과를 나타내었다(Table 2).

• 약학회지
• /
• 제41권4호
• /
• pp.456-461
• /
• 1997

Tyrosinase is known to accelerate the melanin polymer biosynthesis in melanocyte, so tyrosinase inhibitors hinder the melanin polymer biosynthesis and are useful not only for th e material used in cosmetics as skin-whitening agents but also as the remedy for disturbances in pigmentation. During our search for new melanin biosynthesis inhibitors from natural sources, 130 higher plants were tested for the inhibitory effect against tyrosinase activity by the mushroom tyrosinase assay. Among them, Carex humilis ($IC_{50}$, 10vg/ml), Sophora flavescence ($IC_{50},\;20{\sim}50{mu}g/ml$) and Styrax japonica ($IC_{50},\;10{\mu}g/ml$) inhibited the tyrosinase activity strongly.

• 약학회지
• /
• 제41권4호
• /
• pp.518-523
• /
• 1997

To isolate biologically active compounds which exhibit tyrosinase inhibition activity and ultimately express skin whitening effect, 14 oriental herbal drugs were screened in ter ms of tyrosinase inhibition. For this purpose, in vitro enzyme assay system for tyrosinase, so called Pomerantz method with some modifications has been established. Crude methanolic extracts from 14 herbal drugs were made and examined for their inhibitory activity against tyrosinase. Those extracts from Cnidii Rhizoma, Arecae Semen, Caryophylli Flos, and Ephedrae Herba showed strong inhibitory activities on mushroom tyrosinase. Therefore, crude methanolic extracts from those 4 herbal drugs were further fractionated using ether, butanol and water. respectively. The ether and n-butanol extracts from Arecae Semen and the n-butanol and water extracts from Caryophylli Flos, respectively, showed relatively strong tyrosinase inhibitory activity compared to arbutin.

• Journal of Applied Biological Chemistry
• /
• 제62권2호
• /
• pp.137-141
• /
• 2019

본 연구에서 금잔화(Calendula arvensis)에 대한 다양한 생리, 화학적 활성을 시험하여 기능성소재 가능성을 검토하였다. 금잔화 추출물은 낮은 세포독성을 나타냈다. 세포독성이 거의 없는 농도에서 금잔화 추출물 처리 시, 산화방지 활성, tyrosinase 활성저해 및 멜라닌 함량 저하를 보여주었다. 금잔화 추출물 농도에 따라 tyrosinase 단백질 발현이 억제되었으며, 이는 금잔화 추출물이 tyrosinase의 활성 및 단백질 발현을 억제시키거나 혹은 멜라노좀 수송 저해 등 다른 요인에 의해 멜라닌 합성을 저해하는 것으로 생각된다. 또한, 금잔화 추출물 처리 시, 항균활성이 나타남을 확인하였다. 따라서 금잔화 추출물은 향후 기능성 소재에 활용할 수 있는 효과적인 물질이 될 수 있다고 판단된다.

• 동의생리병리학회지
• /
• 제24권2호
• /
• pp.296-301
• /
• 2010

The purpose of this study was to investigate the mechanism of Hexane extract of Fructus Ligustri Lucidi (HFLL)-induced regulation of melanogenesis. An apparent down-regulatory effect of tyrosinase activity was observed when B16F10 cells were incubated with HFLL. Interestingly, HFLL did not inhibit the catalytic activity of cell-free tyrosinase from B16F10 cells, whereas kojic acid directly inhibited tyrosinase activity. Regarding protein levels of melanogenic enzymes, the amounts of tyrosinase and tyrosinase-related protein 1 (TRP-1) were decreased by HFLL, while the amount of tyrosinase-related protein 2 (TRP-2) slightly was reduced after incubation with HFLL. Treatment with HFLL was found to down-regulate microphthalmia-associated transcription factor (MITF). These results suggest that HFLL is an effective inhibitor of pigmentation caused by down regulation via MITF, tyrosinase, and TRP-1 expressions.

• 생약학회지
• /
• 제50권2호
• /
• pp.112-117
• /
• 2019

In this study, extracts of bark from Ulmus davidiana var. japonica and its fractions were investigated the antioxidative, antibacterial and tyrosinase inhibition activity for physiological activity towards functional applications. In the measurement of DPPH radical scavenging activity, the ethyl acetate fraction showed higher radical scavenging ability than others. Moreover, in the tyrosinase inhibition assay, showed that the ethyl acetate fraction has good inhibition effects. Results of the DPPH radical scavenging and tyrosinase inhibition activity are related with the total polyphenol concentrations of ethyl acetate fraction. In antibacterial activity used to find out by utilizing the disc diffusion assay, chloroform fraction showed strong effect against Staphylococcus aureus and S. epidermidis. These results are related with the flavonoid contents of chloroform fraction. On the other hand, in the L929 cell viability measurement by MTT assay, the hexane, butanol and aqueous fraction treated at high concentration were showed cytotoxicity. But the others samples were exhibited a moderate viabilities. As a result of investigated the antioxidant and tyrosinase inhibition activity, the ethyl acetate fraction could be applicable for cosmetics related fields. And the chloroform fraction showed significant antibacterial activity against S. aureus and S. epidermidis.