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activator protein 1 melanin

Asfa Rizvi, Bilal Ahmed, Almas Zaidi, Mohd Saghir Khan
Heavy metal pollution destruct soil microbial compositions and functions, plant's performance and subsequently human health. Culturable microbes among many metal abatement strategies are considered inexpensive, viable and environmentally safe. In this study, nitrogen fixing bacterial strain CAZ3 recovered from chilli rhizosphere tolerated 100, 1000 and 1200 µg mL-1 of cadmium, chromium and nickel, respectively and was identified as Azotobacter chroococcum by 16S rDNA sequence analysis. Under metal stress, cellular morphology of A...
February 13, 2019: Ecotoxicology
Puxvadee Chaikul, Nuntawat Khat-Udomkiri, Kochchawan Iangthanarat, Jiradej Manosroi, Aranya Manosroi
Physicochemical characteristics and in vitro anti-skin aging activity of gallic acid loaded in niosomes were investigated. Gallic acid was loaded in neutral (Brij 52/cholesterol at 7:3) and cationic CTAB niosomes (Brij 52/cholesterol/cetyltrimethylammonium bromide at 7:3:0.65). The maximum loading capacity and entrapment efficiency of gallic acid were 3.5, 4.48 ± 2.10 in neutral and 50%, w/w, 10.94 ± 0.78% in cationic CTAB niosomes, respectively. All gallic acid loaded in niosomes showed the unilamellar structure under transmission electron microscope with size range of 131...
February 5, 2019: European Journal of Pharmaceutical Sciences
Ruolin Hou, Xin Liu, Junjie Yan, Kaikai Xiang, Xiaoping Wu, Wenxiong Lin, Guanshui Chen, Mingfeng Zheng, Junsheng Fu
This study characterized the natural melanin from Auricularia auricula and investigated its hepatoprotective effect on mice with acute alcoholic liver injury. The characterization of the melanin was analyzed based on elemental analysis, gel permeation chromatography (GPC), UV-visible spectroscopy (UV-visible), infrared spectrum (IR) and nuclear magnetic resonance spectra (NMR). To determine the liver protective effect of Auricularia auricula melanin, mice were administered with the melanin once daily for 3 weeks before ethanol induced liver injury...
February 1, 2019: Food & Function
Ga-Young Seo, Yuna Ha, Ah-Hyun Park, Oh Wook Kwon, Youn-Jung Kim
Leathesia difformis (L.) Areschoug ( L. difformis ) is a species of littoral brown algae of the class Phaeophyceae. Only a few studies on the apoptotic, antiviral, and antioxidant properties of L. difformis have been reported, and its inhibitory effect on melanin synthesis has not been studied. The aim of this study was to investigate the anti-melanogenic effect of L. difformis extract on α-melanocyte-stimulating hormone (α-MSH)-induced B16F10 melanocytes and its mechanism of action. L. difformis was extracted using 80% ethanol (LDE) and then fractioned between ethyl acetate (LDE-EA) and water (LDE-A)...
January 28, 2019: International Journal of Molecular Sciences
Moragot Chatatikun, Takeshi Yamauchi, Kenshi Yamasaki, Setsuya Aiba, Anchalee Chiabchalard
Croton roxburghii and Croton sublyratus have been used as skin treatments in traditional medicine. The objective of the present study was to investigate the antimelanogenic effect of ethanol extracts of Croton roxburghii (CRE) and Croton sublyratus (CSE) leaves on cellular melanin content and cellular tyrosinase activity as mediated by the action of microthalmia transcription factor (MITF) and melanogenic enzymes. Croton roxburghii and Croton sublyratus leaves were extracted by petroleum ether, dichloromethane and absolute ethanol, sequentially...
January 2019: Journal of Traditional and Complementary Medicine
Qi-Yun Wu, Zack Chun-Fai Wong, Cheng Wang, Aster Hei-Yiu Fung, Emily Oi-Ying Wong, Gallant Kar-Lun Chan, Tina Ting-Xia Dong, Yicun Chen, Karl Wah-Keung Tsim
BACKGROUND: Gentiana is a genus of flowering plants in Gentianaceae family, which comprises of 1,600 species. The roots of few species of Gentiana, also known as Long Dan Cao in Chinese, are traditionally used in herbal remedies for a wide variety of liver-associated diseases. The medicinal part of Gentiana is root; however, the trumpet-shaped flowers are seldom being used. PURPOSE: We investigated the anti-melanogenesis effect of water extract of Gentiana veitchiorum Hemsl...
December 10, 2018: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
Victor L Quan, Bin Zhang, Lauren S Mohan, Katherine Shi, Maria C Isales, Elnaz Panah, Timothy J Taxter, Nike Beaubier, Kevin White, Pedram Gerami
Recent studies have described kinase fusions as the most common initiating genomic events in Spitzoid neoplasms. Each rearrangement generates a chimeric protein with constitutive activation of the tyrosine kinase domain, resulting in the development of a Spitzoid neoplasm. Identifying key initiating genomic events and drivers may assist in diagnosis, prognostication, and management. Retrospective, consecutive search of our database between 2009 and 2018 for Spitzoid neoplasms identified 86 cases. Whole transcriptome mRNA and DNA sequencing (1714 genes) detected 9% of cases (8/86) with structural rearrangements in MAPK genes other than BRAF and 47% (40/86) with kinase fusions previously described in Spitzoid neoplasms...
January 11, 2019: American Journal of Surgical Pathology
Xiu Juan Xin, Jiahong Zou, Tao Zou, Huoli Shang, Li Yun Sun
Vitiligo is a kind of skin dysfunction on melanogenesis. The highly prevalent, chronic, and distinctive complexion changes on patients have imposed enormous psychic and economic burden on both individuals and society. Traditional Chinese Medicine (TCM) is a kind of precious source on chronic disease treatment, including skin dysfunctional diseases. In our previous study, a new compound named apigenin-7-butylene glucoside has been authenticated and purified from a prescription of Chinese traditional medicine formula which has been used clinically in vitiligo treatment...
2018: Evidence-based Complementary and Alternative Medicine: ECAM
Jung-Eun Yang, Hien T T Ngo, Eunson Hwang, Seul A Seo, Sul Woong Park, Tae-Hoo Yi
Exposure of skin to UVB radiation is associated with skin thickening, erythema, deep wrinkles, and marked losses of elasticity, resilience, and hydration. To find effective anti-aging materials, scientists have studied not only natural nutritional sources, but also biotransformed metabolites. Although Hibiscus syriacus L., the national flower of Korea has been used extensively throughout history, it has not yet been examined for possible anti-aging effects. In this study, skin anti-aging effects of H. syriacus L...
December 17, 2018: Archives of Biochemistry and Biophysics
Gaku Satou, Daisuke Maji, Takayuki Isamoto, Yuichi Oike, Motoyoshi Endo
Sunburn causes inflammation, which increases melanin production in skin and causes hyperpigmentation. Angiopoietin-like protein (ANGPTL) 2 is an inflammatory mediator induced in sun-exposed skin areas. However, whether ANGPTL2 functions in melanin production remains unclear. To assess this possibility, we overexpressed Angptl2 in the melanoma line B16 and in the keratinocyte line HaCaT. Relative to controls, Angptl2-expressing B16 cells produced higher melanin levels via tyrosinase induction. Accordingly, Angptl2-expressing HaCaT cells secreted relatively high levels of both endothelin-1 (ET-1) and α-melanocyte stimulating hormone (α-MSH)...
December 16, 2018: Experimental Dermatology
Jae Yeon Lee, Young-Rak Cho, Ju Hyoung Park, Eun-Kyung Ahn, Wonsik Jeong, Hyoung Seok Shin, Mi-Sun Kim, Seung Hwan Yang, Joa Sub Oh
Kummerowia striata ( K. striata ) is used as a traditional medicine for inflammation-related therapy. To determine whether it has beneficial anti-melanogenic and anti-oxidant activities, we investigated the biological activities of the ethanol extract of Kummerowia striata (EKS) using a variety of in vitro and cell culture model systems. The anti-melanogenic activity was assessed in B16F10 melanoma cells in terms of melanin synthesis and in vitro tyrosinase inhibitory activity. The anti-oxidant assays were performed using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS)...
2019: Toxicology Reports
Siqi Zhou, Kazuichi Sakamoto
Melanin is the main product of human melanocytes and functions to protect skin from ultraviolet (UV) radiation while conferring color to skin and hair. Tyrosinase is the rate-limiting enzyme for melanin synthesis along with tyrosinase-related protein (TRP)-1 and TRP-2. Microphthalmia-associated transcription factor regulates tyrosinase gene expression and is in turn regulated by extracellular signal-regulated kinase (ERK), phosphoinositide 3-kinase (PI3K)/AKT, and glycogen synthase kinase (GSK)3β signaling pathways...
November 11, 2018: Genes to Cells: Devoted to Molecular & Cellular Mechanisms
Per Fessé, Fredrik Qvarnström, Jan Nyman, Ingegerd Hermansson, Johan Ahlgren, Ingela Turesson
To date, the response activated in melanocytes by repeated genotoxic insults from radiotherapy has not been explored. We hypothesized that the molecular pathways involved in the response of melanocytes to ionizing radiation and ultraviolet radiation (UVR) are similar. Skin punch biopsies, not sun-exposed, were collected from prostate cancer patients before, as well as at 1 and 6.5 weeks after daily doses of 0.05-1.1 Gy. Interfollicular melanocytes were identified by ΔNp63- and eosin-periodic acid Schiff staining...
November 8, 2018: Radiation Research
Mohd Aamir, Vinay Kumar Singh, Manish Kumar Dubey, Mukesh Meena, Sarvesh Pratap Kashyap, Sudheer Kumar Katari, Ram Sanmukh Upadhyay, Amineni Umamaheswari, Surendra Singh
Vascular wilt of tomato caused by Fusarium oxysporum f.sp. lycopersici (FOL) is one of the most devastating diseases, that delimits the tomato production worldwide. Fungal short-chain dehydrogenases/reductases (SDRs) are NADP(H) dependent oxidoreductases, having shared motifs and common functional mechanism, have been demonstrated as biochemical targets for commercial fungicides. The 1,3,6,8 tetra hydroxynaphthalene reductase (T4HNR) protein, a member of SDRs family, catalyzes the naphthol reduction reaction in fungal melanin biosynthesis...
2018: Frontiers in Pharmacology
Thaís Meira Menezes, Sinara Mônica Vitalino de Almeida, Ricardo Olímpio de Moura, Gustavo Seabra, Maria do Carmo Alves de Lima, Jorge Luiz Neves
Here, we evaluate spiroacridines as inhibitors of tyrosinase, a key enzyme to melanogenesis. For this purpose, the spiroacridines 3-(acridin-9-yl)-N-benzylidene-2-cyanoacrylohydrazide (AMTAC-01) and 3-(acridin-9-yl)-2-cyano-N-(4-metoxybenzylidene)-acrylohydrazide (AMTAC-02) were synthesized and their enzymatic inhibition types and mechanisms were investigated. In addition, the interaction of these compounds with the enzyme were studied by UV-Vis spectroscopy, spectrofluorimetry, 1 H NMR titration as well as molecular docking...
October 26, 2018: International Journal of Biological Macromolecules
Wenjun Yang, Lifang Ruan, Jiangming Tao, Donghai Peng, Jinshui Zheng, Ming Sun
Bacillus thuringiensis formulation losing its activity under field conditions due to UV radiation and photoprotection of B. thuringiensis based on melanin has attracted the attention of researchers for many years. Here, a single amino acid substitution (G272E) in homogentisate 1,2-dioxygenase was found to be responsible for pigment overproduction in B. thuringiensis BMB181, a derivative of BMB171. Disrupting the gene encoding homogentisate dioxygenase in BMB171 induced the accumulation of the homogentisic acid and provoked an increased pigment formation...
2018: Frontiers in Microbiology
Sultan Ullah, Dongwan Kang, Sanggwon Lee, Muhammad Ikram, Chaeun Park, Yujin Park, Sik Yoon, Pusoon Chun, Hyung Ryong Moon
Of the three enzymes that regulate the biosynthesis of melanin, tyrosinase and its related proteins TYRP-1 and TYRP-2, tyrosinase is the most important because of its ability to limit the rate of melanin production in melanocytes. For treating skin pigmentation disorders caused by an excess of melanin, the inhibition of tyrosinase enzyme is by far the most established strategy. Cinnamic acid is a safe natural product with an (E)-β-phenyl-α,β-unsaturated carbonyl motif that we have previously shown to play an important role in high tyrosinase inhibition...
October 15, 2018: European Journal of Medicinal Chemistry
Rakotomalala Manda Heriniaina, Jing Dong, Praveen Kumar Kalavagunta, Hua-Li Wu, Dong-Sheng Yan, Jing Shang
Several chemical compounds can restore pigmentation in vitiligo through mechanisms that vary according to disease etiology. In the present study, we investigated the melanogenic activity of six structurally distinct compounds, namely, scopoletin, kaempferol, chrysin, vitamin D3 , piperine, and 6-benzylaminopurine. We determined their effectiveness, toxicity, and mechanism of action for stimulating pigmentation in B16F10 melanoma cells and in a zebrafish model. The melanogenic activity of 6-benzylaminopurine, the compound identified as the most potent, was further verified by measuring green fluorescent protein concentration in tyrp1 a: eGFP (tyrosinase-related protein 1) zebrafish and mitfa: eGFP (microphthalmia associated transcription factor) zebrafish and antioxidative activity...
October 2018: Chinese Journal of Natural Medicines
Taek-In Oh, Hye-Jeong Jung, Yoon-Mi Lee, Sujin Lee, Geon-Hee Kim, Sang-Yeon Kan, Hyeji Kang, Taerim Oh, Hyun Myung Ko, Keun-Chang Kwak, Ji-Hong Lim
Zerumbone (ZER), an active constituent of the Zingiberaceae family, has been shown to exhibit several biological activities, such as anti-inflammatory, anti-allergic, anti-microbial, and anti-cancer; however, it has not been studied for anti-melanogenic properties. In the present study, we demonstrate that ZER and Zingiber officinale (ZO) extract significantly attenuate melanin accumulation in α-melanocyte-stimulating hormone (α-MSH)-stimulated mouse melanogenic B16F10 cells. Further, to elucidate the molecular mechanism by which ZER suppresses melanin accumulation, we analyzed the expression of melanogenesis-associated transcription factor, microphthalmia-associated transcription factor (MITF), and its target genes, such as tyrosinase , tyrosinase-related protein 1 ( TYRP1 ), and tyrosinase-related protein 2 ( TYRP2 ), in B16F10 cells that are stimulated by α-MSH...
October 13, 2018: International Journal of Molecular Sciences
Hong Xu Li, Jung Up Park, Xiang Dong Su, Kyung Tae Kim, Jong Seong Kang, Young Ran Kim, Young Ho Kim, Seo Young Yang
The individual parts of Morus alba L. including root bark, branches, leaves, and fruits are used as a cosmetic ingredient in many Asian countries. This study identified several anti-melanogenesis constituents in a 70% ethanol extract of M. alba leaves. The ethyl acetate fraction of the initial ethanol extract decreased the activity of tyrosinase, a key enzyme in the synthetic pathway of melanin. Twelve compounds were isolated from this fraction and their structures were identified based on spectroscopic spectra...
October 8, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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