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Yeom G.G.M.,IPEERES Cosmetics Ltd. | Min S.,Laboratory of Microbiology | Kim S.Y.,Gachon University
International Immunopharmacology | Year: 2014

Background 2,3,5,6-Tetramethylpyrazine (TMP) is known as a composition of Ephedra sinica and it has been used in the treatment of several disorders such as asthma, heart failure, rhinitis, and urinary incontinence. It has been reported that TMP inhibits melanoma metastasis and suppression angiogenesis by VEGF. Objective The inhibitory activity of melanogenic proteins by TMP was confirmed in UVA-induced melanoma/keratinocyte co-culture system in this paper. Methods The melanin content, cell viability and cytokines release such as TNFα, IL-1β, IL-8 and GM-CSF were measured by ELISA assay. In addition, TRP1, MITF and MAPK signaling protein expression were also evaluated by Western blotting analysis. Results Decreasing melanogenic factors (TRP1, MITF, and MAPK) and factors (TNFα, IL-1β, IL-8, and GM-CSF) improving skin cancer and inflammation were identified. Conclusion It suggests that TMP can serve as a potent candidate for regulation of melanogenesis. © 2013 Elsevier B.V. Source


Kwak S.-Y.,Seoul National University | Yang J.-K.,Seoul National University | Choi H.-R.,Seoul National University | Park K.-C.,Seoul National University | And 2 more authors.
Bioorganic and Medicinal Chemistry Letters | Year: 2013

We previously reported that caffeoyl-amino acidyl-hydroxamic acid (CA-Xaa-NHOH) acted as both a good antioxidant and tyrosinase inhibitor, in particular when caffeic acid was conjugated with proline or amino acids having aromatic ring like phenylalanine. Here, various hydroxycinnamic acid (HCA) derivatives were further conjugated with phenylalanyl hydroxamic acid and prolyl hydroxamic acid (HCA-Phe-NHOH and HCA-Pro-NHOH) to study the structure and activity relationship as both antioxidants and tyrosinase inhibitors. When their biological activities were evaluated, all HCA-Phe-NHOH and HCA-Pro-NHOH exhibited enhanced antioxidant activity compared to HCA alone. Moreover, derivatives of caffeic acid, ferulic acid, and sinapic acid inhibited lipid peroxidation more efficiently than vitamin E analogue (Trolox). In addition, derivatives of caffeic acid and sinapic acid efficiently inhibited tyrosinase activity and reduced melanin content in melanocytes Mel-Ab cell. © 2012 Elsevier Ltd. All rights reserved. Source


Huh G.-W.,Kyung Hee University | Park J.-H.,Kyung Hee University | Shrestha S.,Kyung Hee University | Lee Y.-H.,Kyung Hee University | And 4 more authors.
Holzforschung | Year: 2012

From the heartwood of Lindera glauca Blume three new diarylpropanoids have been isolated and identified, which were named lindeglaucol, lindeglaucone, and lindeglaucoside A. Chipped heartwood was extracted repeatedly with 80% aqueous methanol (MeOH) at room temperature, and the concentrated methanolic extract was successively partitioned with ethyl acetate (EtOAc), n -butanol, and H 2O. From the EtOAc fraction, three new diarylpropanoids and a known chalconoid were isolated through repeated column chromatography with silica gel, octadecyl silica gel, and Sephadex LH-20. The chemical structures of the compounds were elucidated by interpretation of extensive spectroscopic data such as nuclear magnetic resonance, fast atom bombardment mass spectroscopy, and infrared. In addition, a known chalconoid, cilicicone B, was isolated for the first time from the heartwood of L. glauca. Copyright © by Walter de Gruyter. Source


Yeom G.,IPEERES Cosmetics Ltd. | Yeom G.,Kyung Hee University | Yun D.-M.,IPEERES Cosmetics Ltd. | Kang Y.-W.,IPEERES Cosmetics Ltd. | And 3 more authors.
Journal of Cosmetic Science | Year: 2011

Facial packs or masks are popular beauty treatments that are thought to improve skin quality. We formulated a yoghurt pack using natural ingredients (F-YOP), with consideration of skin affinity, safety, health, and beauty. Then, we performed an in vitro assessment of biological activity and in vivo assessments of moisture, TEWL, melanin content, and elasticity. Facial areas treated with F-YOP showed increased moisture compared to control regions: 89±6.26% (forehead), 140.72±10.19% (cheek), and 123.29±6.67% (chin). Transepidermal water loss (TEWL) values were decreased in the treated areas compared to control: 101.38±6.95% (forehead), 50.37±5.93% (cheek), and 157.81±10.88% (chin). Elasticity was decreased in the control region, whereas the treatment region did not change. The initial elasticity was maintained in the cheek. F-YOP exhibited activity on DPPH radical scavenging, SOD-like activity, and lipoxygenase activity. F-YOP treatment successfully improved the moisture, brightness, and elasticity of treated skin. Source

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