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https://www.readbyqxmd.com/read/30081602/-tert-butylphenolic-derivatives-from-paenibacillus-odorifer-a-case-of-bioconversion
#1
Thi-Bach-Le Nguyen, Olivier Delalande, Isabelle Rouaud, Solenn Ferron, Laura Chaillot, Rémy Pedeux, Sophie Tomasi
Two compounds ( 1 ) and ( 2 ) containing tert -butylphenol groups were, for the first time, produced during the culture of Paenibacillus odorifer , a bacterial strain associated with the crustose lichen, Rhizocarpon geographicum . Their entire structures were identified by one-dimensional (1D) and two-dimensional (2D) NMR and high-resolution electrospray ionisation mass spectrometry (HRESIMS) spectroscopic analyses. Among them, Compound 1 exhibited significant cytotoxicity against B16 murine melanoma and HaCaT human keratinocyte cell lines with micromolar half maximal inhibitory concentration (IC50 ) values...
August 5, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28510957/antioxidant-cell-protective-and-anti-melanogenic-activities-of-leaf-extracts-from-wild-bitter-melon-momordica-charantia-linn-var-abbreviata-ser-cultivars
#2
Tsung-Hsien Tsai, Ching-Jang Huang, Wen-Huey Wu, Wen-Cheng Huang, Jong-Ho Chyuan, Po-Jung Tsai
BACKGROUND: Several wild bitter melon (WBM; Momordica charantia Linn. var. abbreviata Ser.) cultivars were developed in Taiwan. However, little information is available regarding biological function of WBM leaf. Therefore, the objectives of this study were to investigate the nutrient content, antioxidant, cell protection and anti-melanogenic properties of wild bitter melon leaf. RESULTS: Methanolic leaf extracts were prepared from a variety and two cultivars of WBM...
December 2014: Botanical Studies (Taipei, Taiwan)
https://www.readbyqxmd.com/read/27403230/biofunctional-activities-of-equisetum-ramosissimum-extract-protective-effects-against-oxidation-melanoma-and-melanogenesis
#3
Pin-Hui Li, Yu-Pin Chiu, Chieh-Chih Shih, Zhi-Hong Wen, Laura Kaodichi Ibeto, Shu-Hung Huang, Chien Chih Chiu, Dik-Lung Ma, Chung-Hang Leung, Yaw-Nan Chang, Hui-Min David Wang
Equisetum ramosissimum, a genus of Equisetaceae, is a medicinal plant that can be separated into ethyl acetate (EA), dichloromethane (DM), n-hexane (Hex), methanol (MeOH), and water extracts. EA extract was known to have potent antioxidative properties, reducing power, DPPH scavenging activity, and metal ion chelating activity. This study compared these five extracts in terms of their inhibiting effects on three human malignant melanomas: A375, A375.S2, and A2058. MTT assay presented the notion that both EA and DM extracts inhibited melanoma growth but did not affect the viabilities of normal dermal keratinocytes (HaCaT) or fibroblasts...
2016: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/27220837/microrna-18b-inhibits-the-growth-of-malignant-melanoma-via-inhibition-of-hif-1%C3%AE-mediated-glycolysis
#4
Yao Chen, Ziqing Zhang, Chengqun Luo, Zizi Chen, Jianda Zhou
MicroRNAs (miRs) have been demonstrated to play critical roles in the development and progression of malignant melanoma (MM). However, the exact role and underlying mechanism of miR-18b in MM growth remains unclear. In the present study, real-time PCR data indicated that miR-18b was significantly downregulated in MM tissues compared to their matched adjacent non-tumor tissues. Low miR-18b expression was significantly associated with the tumor thickness and stage, although no significant association was observed between the miR-18b expression and the age, gender, or lymph node metastasis...
July 2016: Oncology Reports
https://www.readbyqxmd.com/read/24593964/a-lectin-from-bothrops-leucurus-snake-venom-raises-cytosolic-calcium-levels-and-promotes-b16-f10-melanoma-necrotic-cell-death-via-mitochondrial-permeability-transition
#5
Mary A Aranda-Souza, Franco A Rossato, Rute A P Costa, Tiago R Figueira, Roger F Castilho, Miriam C Guarniere, Erika S Nunes, Luana C B B Coelho, Maria T S Correia, Anibal E Vercesi
BlL, a galactose-binding C-type lectin purified from Bothrops leucurus snake venom, exhibits anticancer activity. The current study was designed to elucidate the cellular mechanisms by which BlL induces melanoma cell death. The viabilities of B16-F10 melanoma cells and HaCaT keratinocytes treated with BlL were evaluated. Necrotic and apoptotic cell death, cytosolic Ca(2+) levels, mitochondrial Ca(2+) transport and superoxide levels were assessed in B16-F10 melanoma cells exposed to BlL. We found that treatment with BlL caused dose-dependent necrotic cell death in B16-F10 melanoma cells...
May 2014: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/24142482/identification-of-a-novel-peptide-that-blocks-basic-fibroblast-growth-factor-mediated-cell-proliferation
#6
Xiaoping Wu, Huixian Huang, Cong Wang, Shaoqiang Lin, Yadong Huang, Yi Wang, Guang Liang, Qiuxia Yan, Jian Xiao, Jianzhang Wu, Yongguang Yang, Xiaokun Li
Basic fibroblast growth factor (bFGF) has been implicated in tumor growth via interactions with its receptors (FGFRs) on the cell surface and therefore, bFGF/FGFRs are considered essential targets for cancer therapy. Herein, a consensus heptapeptide (LSPPRYP) was identified for the first time from a phage display heptapeptide library after three sequential rounds of biopanning against FGFR-expressing cells with competitive displacement of phage by bFGF, followed by subtraction of non-specific binding by FGFR-deficient cells...
October 2013: Oncotarget
https://www.readbyqxmd.com/read/24070160/antioxidant-anti-adipocyte-differentiation-antitumor-activity-and-anthelmintic-activities-against-anisakis-simplex-and-hymenolepis-nana-of-yakuchinone-a-from-alpinia-oxyphylla
#7
Rong-Jyh Lin, Chuan-Min Yen, Tzung-Han Chou, Feng-Yu Chiang, Guey-Horng Wang, Ya-Ping Tseng, Lin Wang, Ting-Wei Huang, Hui-Chuan Wang, Leong-Perng Chan, Hsiou-Yu Ding, Chia-Hua Liang
BACKGROUND: Alpinia oxyphylla is a common remedy in traditional Chinese medicine. Yakuchinone A is a major constituent of A. oxyphylla and exhibits anti-inflammatory, antitumor, antibacterial, and gastric protective activities. METHODS: Antioxidant and antitumor characteristics of yakuchinone A in skin cancer cells as well as novel mechanisms for the inhibition of adipocyte differentiation, cestocidal activities against Hymenolepis nana adults, and nematocidal activities against Anisakis simplex larvae are investigated...
2013: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/23905018/down-regulation-of-tyrosinase-trp-1-trp-2-and-mitf-expressions-by-citrus-press-cakes-in-murine-b16-f10-melanoma
#8
Sang Suk Kim, Min-Jin Kim, Young Hun Choi, Byung Kok Kim, Kwang Sik Kim, Kyung Jin Park, Suk Man Park, Nam Ho Lee, Chang-Gu Hyun
OBJECTIVE: To investigate the suitability of citrus-press cakes, by-products of the juice industry as a source for the whitening agents for cosmetic industry. METHODS: Ethylacetate extracts of citrus-press cakes (CCE) were examined for their anti-melanogenic potentials in terms of the inhibition of melanin production and mechanisim of melanogenesis by using Western Blot analysis with tyrosinese, tyrosinase-related protein-1 (TRP-1), TRP2, and microphthalmia-associated transcription factor (MITF) proteins...
August 2013: Asian Pacific Journal of Tropical Biomedicine
https://www.readbyqxmd.com/read/23420785/rapid-screening-of-potential-autophagic-inductor-agents-using-mammalian-cell-lines
#9
Waleska K Martins, Divinomar Severino, Cleidiane Souza, Beatriz S Stolf, Maurício S Baptista
Recent progress in understanding the molecular basis of autophagy has demonstrated its importance in several areas of human health. Affordable screening techniques with higher sensitivity and specificity to identify autophagy are, however, needed to move the field forward. In fact, only laborious and/or expensive methodologies such as electron microscopy, dye-staining of autophagic vesicles, and LC3-II immunoblotting or immunoassaying are available for autophagy identification. Aiming to fulfill this technical gap, we describe here the association of three widely used assays to determine cell viability - Crystal Violet staining (CVS), 3-[4, 5-dimethylthiaolyl]-2, 5-diphenyl-tetrazolium bromide (MTT) reduction, and neutral red uptake (NRU) - to predict autophagic cell death in vitro...
June 2013: Biotechnology Journal
https://www.readbyqxmd.com/read/23207771/trans-caffeic-acid-stearyl-ester-from-paeonia-suffruticosa-inhibits-melanin-synthesis-by-camp-mediating-down-regulation-of-%C3%AE-melanocyte-stimulating-hormone-stimulated-melanogenesis-signaling-pathway-in-b16-cells
#10
Chia-Hua Liang, Tzung-Han Chou, Ya-Ping Tseng, Hsiou-Yu Ding
trans-Caffeic acid stearyl ester (TCASE) from the root cortex of Paeonia suffruticosa ANDREWS is a traditional medicinal herb that has several beneficial properties. However, the inhibitory effect of TCASE on melanogenesis has not been explored. In the cell viability assay, TCASE did not show a cytotoxic effect at a dose of 65 µM for 48 h in B16, HaCaT and Hs68 cells. TCASE considerably inhibits melanin synthesis, and reduces intracellular cyclic adenosine monophosphate (cAMP) levels, tyrosinase activity and L-3-(3,4-dihydroxyphenyl)-alanine (DOPA) oxidase activity in a concentration-dependent manner in the presence of α-melanocyte-stimulating hormone (α-MSH) in B16 cells, and the inhibition efficiency of TCASE exceeds that of ascorbic acid and arbutin...
2012: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/23041521/lobarin-from-the-sumatran-lichen-stereocaulon-halei
#11
Friardi Ismed, Françoise Lohézic-Le Dévéhat, Olivier Delalande, Sourisak Sinbandhit, Amri Bakhtiar, Joël Boustie
The diphenyl ether, lobarin (1) (syn. lobariol carboxylic acid) related to lobaric acid was isolated for the first time as a natural product along with five known compounds from Stereocaulon halei, a fruticose lichen collected in Indonesia. The structure of lobarin was elucidated by spectroscopic data analysis and its most stable conformers were determined by molecular mechanic dynamic calculations. A marked superoxide anion scavenging was found for compound 1 while no cytotoxicity on the B16 murine melanoma and HaCaT human keratinocyte cell lines was observed...
December 2012: Fitoterapia
https://www.readbyqxmd.com/read/22339577/coenzyme-q-10-enhances-dermal-elastin-expression-inhibits-il-1%C3%AE-production-and-melanin-synthesis-in-vitro
#12
COMPARATIVE STUDY
M Zhang, L Dang, F Guo, X Wang, W Zhao, R Zhao
Coenzyme Q(10) (CoQ(10) ) is a well-known antioxidant and has been used in many skincare products for anti-ageing purpose. However, the molecular mechanisms of CoQ(10) function in skin cells are not fully understood. In this paper, we compared the effects of CoQ(10) on primary human dermal fibroblasts from three individuals, including adult. We demonstrated that CoQ(10) treatment promoted proliferation of fibroblasts, increased type IV collagen expression and reduced UVR-induced matrix metalloproteinases-1 (MMP-1) level in embryonic and adult cells...
June 2012: International Journal of Cosmetic Science
https://www.readbyqxmd.com/read/21672031/ov-16-4-3-4-dihydroxybenzoyloxymethyl-phenyl-o-%C3%AE-d-glucopyranoside-inhibits-melanin-synthesis-by-regulating-expressions-of-melanogenesis-regulated-gene-and-protein
#13
Chia-Hua Liang
Ov-16 (4-(3,4-dihydroxybenzoyloxymethyl)phenyl-O-β-D-glucopyranoside), a polyphenolic glycoside that is isolated from oregano (Origanum vulgare L.), can scavenge 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radicals. This investigation is the first to study in detail the hypopigmentary properties of Ov-16. It demonstrates that 0-1000 μg/ml Ov-16 inhibits the activity of mushroom tyrosinase (Tyr) in a concentration-dependent manner. The inhibitionary Tyr kinetics of Ov-16 towards the oxidation of L-DOPA was found to be uncompetitive...
September 2011: Experimental Dermatology
https://www.readbyqxmd.com/read/21624335/cytotoxic-effects-of-argentinean-plant-extracts-on-tumour-and-normal-cell-lines
#14
L Mamone, G Di Venosa, J J Valla, L Rodriguez, L Gándara, A Batlle, M Heinrich, A Juarranz, F Sanz-Rodriguez, A Casas
In the search for possible new anti-cancer agents, we investigated the effects of 75 aqueous and methanol extracts from 41 Argentinean plant species. The effect in cell growth was evaluated in the LM2 mammary adenocarcinoma cells. In a second stage, the highly active selected extracts were assayed in 3 other tumour cell lines: melanoma B16, bladder MB49 and lung A549; and 3 normal cell lines: mammary Hb4a and keratinocytes PAM212 and HaCat. Eight methanol extracts were found to be highly cytotoxic: Collaea argentina leaf, Iochroma australe leaf, Ipomoea bonariensis flower, Jacaranda mimosifolia flower, Solanum amygdalifolium flower, Solanum chacoense leaf, Solanum sisymbriifolium flower and Solanum verbascifolium flower...
2011: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/20887553/chloroform-extract-from-moricandia-arvensis-inhibits-growth-of-b16-f0-melanoma-cells-and-promotes-differentiation-in-vitro
#15
I Skandrani, A Pinon, A Simon, K Ghedira, L Chekir-Ghedira
OBJECTIVES: Poor therapeutic results have been reported for treatment of malignant melanoma; therefore in this study we have investigated inhibitory capacity of ethyl acetate, chloroform (Chl) and methanol extracts from Moricandia arvensis on mouse melanoma (B16-F0) and human keratinocyte (HaCaT) cell proliferation. Influence of Chl extract on percentage distribution in cell cycle phases and melanogenesis was also studied. MATERIAL AND METHODS: Cell viability was determined at various periods using the MTT assay, and flow cytometry was used to analyse effects of Chl extract on progression through the cell cycle and apoptosis...
October 2010: Cell Proliferation
https://www.readbyqxmd.com/read/20484837/effect-of-palmitoleic-acid-on-melanogenic-protein-expression-in-murine-b16-melanoma
#16
Weon-Jong Yoon, Min-Jin Kim, Ji-Young Moon, Ho-Jung Kang, Gi-Ok Kim, Nam Ho Lee, Chang-Gu Hyun
Melanogenesis is a well-known physiological response of human skin that may occur because of exposure to ultraviolet light, for genetic reasons, or due to other causes. In our efforts to find new skin lightening agents, palmitoleic acid was investigated for its ability to inhibit melanogenesis. In this study, palmitoleic acid's effect on melanin formation was assessed. Results indicated that palmitoleic acid was shown to down-regulate melanin content in a dose-dependent pattern. To clarify the target of palmitoleic acid action in melanogenesis, we performed Western blotting for tyrosinase, tyrosinase-related protein-1 (TRP-1), TRP-2, and microphthalmia-associated transcription factor (MITF), which are key melanogenic enzymes...
2010: Journal of Oleo Science
https://www.readbyqxmd.com/read/20460767/effect-of-heterocyclic-pyrimidine-compounds-on-uvb-induced-cell-damage-in-human-keratinocytes-and-on-melanogenesis-in-mouse-b16-cells
#17
Nao Shimoda, Yasuko Mutou, Noriko Shimura, Mitsutoshi Tsukimoto, Akira Awaya, Shuji Kojima
We investigated the protective effect of several heterocyclic pyrimidine compounds against ultraviolet B (UVB)-induced damage in human keratinocyte HaCaT cells, as well as the inhibitory effect on melanogenesis in B16 melanoma cells. One of the compounds examined, 2-piperadino-6-methyl-5-oxo-5,6-dihydro(7H)pyrrolo[3,4d]pyrimidine maleate (MS-818), showed low cytotoxicity even at 500 microM. At 50-500 microM, MS-818 dose-dependently suppressed the UVB (100 mJ/cm(2))-induced elevation of tumor necrosis factor alpha (TNF-alpha), one of the trigger cytokines for cell death, in HaCaT cells...
2010: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/20095142/enhanced-effects-of-citrate-on-uvb-induced-apoptosis-of-b16-melanoma-cells
#18
Yun-Mi Jeong, Ju Eun Lee, Su Yeon Kim, Hye-Young Yun, Kwang Jin Baek, Nyoun Soo Kwon, Dong-Seok Kim
Ultraviolet (UV) radiation is a major risk factor for the development of melanoma. Recent studies have reported that the intake of citrate-containing juices may reduce the risk of cancer. Thus, we investigated the effects of citrate on UVB-irradiated B16 murine melanoma cells. B16 cells had more evident apoptotic features with the combination of citrate/UVB than by citrate or UVB alone; cell death of HaCaT human keratinocytes was not observed with citrate/UVB. Western blot analysis demonstrated that citrate/UVB led to phosphorylation of the stress signaling proteins, such as c-Jun N-terminal kinase (JNK) and p38 mitogen-activated protein kinase (MAPK)...
December 2009: Die Pharmazie
https://www.readbyqxmd.com/read/19919064/cytotoxic-constituents-of-the-lichen-diploicia-canescens
#19
Marion Millot, Sophie Tomasi, Elisabeth Studzinska, Isabelle Rouaud, Joël Boustie
A new diphenyl ether (1), along with 12 known compounds, was isolated from the lichen Diploicia canescens. The structure of compound 1 was elucidated by spectroscopic data analysis, and the biosynthetic origin of this product is discussed. Secalonic acids B (7), D (8), and F (9) were isolated for the first time from D. canescens. The cytotoxic activities of 1-3, 6-8, and 10 against the B16 murine melanoma and HaCaT human keratinocyte cell lines were evaluated.
December 2009: Journal of Natural Products
https://www.readbyqxmd.com/read/19533253/generation-of-a-tumor-spheroid-in-a-microgravity-environment-as-a-3d-model-of-melanoma
#20
Bernadette Marrero, Jane L Messina, Richard Heller
An in vitro 3D model was developed utilizing a synthetic microgravity environment to facilitate studying the cell interactions. 2D monolayer cell culture models have been successfully used to understand various cellular reactions that occur in vivo. There are some limitations to the 2D model that are apparent when compared to cells grown in a 3D matrix. For example, some proteins that are not expressed in a 2D model are found up-regulated in the 3D matrix. In this paper, we discuss techniques used to develop the first known large, free-floating 3D tissue model used to establish tumor spheroids...
October 2009: In Vitro Cellular & Developmental Biology. Animal
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