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https://www.readbyqxmd.com/read/29442220/methylquercetins-stimulate-melanin-biosynthesis-in-a-three-dimensional-skin-model
#1
Kosei Yamauchi, Tohru Mitsunaga
In a previous study, we found that both synthetic 3-O-methylquercetin (3MQ) and 3,4',7-O-trimethylquercetin (34'7TMQ) increased extracellular melanin content. 34'7TMQ increased the activity of melanogenic enzymes by stimulating the p38 pathway and the expression of microphthalmia-associated transcription factor (MITF). In contrast, 3MQ increased the activity of melanogenic enzymes without the involvement of MITF, which suggests that 3MQ inhibits the degradation of melanogenic enzymes. In the present study, we investigated the effects of 3MQ and 34'7TMQ on melanogenesis in normal human melanocytes and using a commercial three-dimensional (3D) skin model system...
February 13, 2018: Journal of Natural Medicines
https://www.readbyqxmd.com/read/29419867/-analysis-of-sox10-gene-mutation-in-a-family-affected-with-waardenburg-syndrome-type-ii
#2
Lei Zheng, Yousheng Yan, Xue Chen, Chuan Zhang, Qinghua Zhang, Xuan Feng, Shen Hao
OBJECTIVE To detect potential mutation of SOX10 gene in a pedigree affected with Warrdenburg syndrome type II. METHODS Genomic DNA was extracted from peripheral blood samples of the proband and his family members. Exons and flanking sequences of MITF, PAX3, SOX10, SNAI2, END3 and ENDRB genes were analyzed by chip capturing and high throughput sequencing. Suspected mutations were verified with Sanger sequencing. RESULTS A c.127C>T (p.R43X) mutation of the SOX10 gene was detected in the proband, for which both parents showed a wild-type genotype...
February 10, 2018: Zhonghua Yi Xue Yi Chuan Xue za Zhi, Zhonghua Yixue Yichuanxue Zazhi, Chinese Journal of Medical Genetics
https://www.readbyqxmd.com/read/29419543/evaluation-of-mitf-sox10-mart-1-and-r21-immunostaining-for-the-diagnosis-of-residual-melanoma-in-situ-on-chronically-sun-damaged-skin
#3
Euphemia W Mu, Nicola A Quatrano, Sarah E Yagerman, Desiree Ratner, Shane A Meehan
BACKGROUND: Melanocytic immunostains can assist in margin evaluation of melanoma in situ (MIS) excisions; however, their accuracy and reliability relative to hematoxylin & eosin (H&E) is yet to be determined. OBJECTIVE: The objective of this study was to evaluate the sensitivity, specificity, and concordance of 4 melanocyte-specific immunostains for diagnosing MIS occurring on chronically sun-damaged skin. MATERIALS AND METHODS: Serial permanent sections from representative areas of negative margin and residual tumor were stained using H&E, MITF, MART-1, SOX10, and R21 and examined in a blinded fashion...
February 6, 2018: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/29408204/high-mitf-expression-is-associated-with-super-enhancers-and-suppressed-by-cdk7-inhibition-in-melanoma
#4
Philip Eliades, Brian J Abraham, Zhenyu Ji, David M Miller, Camilla L Christensen, Nicholas Kwiatkowski, Raj Kumar, Ching Ni Njauw, Michael Taylor, Benchun Miao, Tinghu Zhang, Kwok-Kin Wong, Nathanael S Gray, Richard A Young, Hensin Tsao
Cutaneous melanoma is an aggressive tumor which accounts for most of the skin cancer deaths. Among the physiological barriers against therapeutic success is a strong survival program driven by genes that specify melanocyte identity such as MITF - a phenomenon known in melanoma biology as "lineage dependency." MITF overexpression is occasionally explained by gene amplification, but here we demonstrate that "super-enhancers" are also important determinants of MITF overexpression in some melanoma cell lines and tumors...
February 2, 2018: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/29407415/waardenburg-syndrome-novel-mutations-in-a-large-brazilian-sample
#5
Magnolia Astrid Pretell Bocángel, Uirá Souto Melo, Leandro Ucela Alves, Eliete Pardono, Naila Cristina Vilaça Lourenço, Humberto Vicente Cezar Marcolino, Paulo Alberto Otto, Regina Célia Mingroni-Netto
This paper deals with the molecular investigation of Waardenburg syndrome (WS) in a sample of 49 clinically diagnosed probands (most from southeastern Brazil), 24 of them having the type 1 (WS1) variant (10 familial and 14 isolated cases) and 25 being affected by the type 2 (WS2) variant (five familial and 20 isolated cases). Sequential Sanger sequencing of all coding exons of PAX3, MITF, EDN3, EDNRB, SOX10 and SNAI2 genes, followed by CNV detection by MLPA of PAX3, MITF and SOX10 genes in selected cases revealed many novel pathogenic variants...
January 30, 2018: European Journal of Medical Genetics
https://www.readbyqxmd.com/read/29399291/sageretia-thea-fruit-extracts-rich-in-methyl-linoleate-and-methyl-linolenate-downregulate-melanogenesis-via-the-akt-gsk3%C3%AE-signaling-pathway
#6
Gyeong-A Ko, Sabina Shrestha, Somi Kim Cho
BACKGROUND/OBJECTIVES: Sageretia thea is traditionally used as a medicinal herb to treat various diseases, including skin disorders, in China and Korea. This study evaluated the inhibitory effect of Sageretia thea fruit on melanogenesis and its underlying mechanisms in B16F10 mouse melanoma cells. The active chemical compounds in anti-melanogenesis were determined in Sageretia thea. MATERIALS/METHODS: Solvent fractions from the crude extract were investigated for anti-melanogenic activities...
February 2018: Nutrition Research and Practice
https://www.readbyqxmd.com/read/29397551/finasteride-inhibits-melanogenesis-through-regulation-of-the-adenylate-cyclase-in-melanocytes-and-melanoma-cells
#7
Jae Ok Seo, Silvia Yumnam, Kwang Won Jeong, Sun Yeou Kim
Finasteride is a well-known 5α-reductase inhibitor used for treatment of alopecia and prostate cancer. But the effect of finasteride in regulating melanogenesis is still unclear. In the present study the role of finasteride on melanogenesis was investigated. Finasteride decrease melanin level in melanocyte melan-a cells and B16F10 melanoma cells without inducing cytotoxicity. MC1R (melanocortin 1 receptor) protein expression was also inhibited by finasteride thereby decreasing the expression of adenylate cyclase, MITF (Melanogenesis associated transcription factor), tyrosinases, TRP (tyrosinase-related protein) -1 and -2...
February 3, 2018: Archives of Pharmacal Research
https://www.readbyqxmd.com/read/29385729/antioxidative-and-anti-melanogenic-activities-of-bamboo-stems-phyllostachys-nigra-variety-henosis-via-pka-creb-mediated-mitf-downregulation-in-b16f10-melanoma-cells
#8
Moon-Hee Choi, Han-Gyo Jo, Ji Hye Yang, Sung Hwan Ki, Hyun-Jae Shin
Phyllostachys nigra var. henosis, a domestic bamboo species, has been attracting much attention; its bioactive compounds (especially in the leaf) show antioxidant, anti-inflammatory, and anti-obesity activities. Little information is available on the antioxidative and anti-melanogenetic activities of the bioactive compounds in bamboo stems. The anti-melanogenic and antioxidative activities of the EtOAc fraction (PN3) of a P. nigra stem extract were investigated in a cell-free system and in B16F10 melanoma cells...
January 30, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29383183/multi-color-rgb-marking-enables-clonality-assessment-of-liver-tumors-in-a-murine-xenograft-model
#9
Michael Thomaschewski, Kristoffer Riecken, Ludmilla Unrau, Tassilo Volz, Kerstin Cornils, Harald Ittrich, Denise Heim, Henning Wege, Ercan Akgün, Marc Lütgehetmann, Jan Dieckhoff, Michael Köpke, Maura Dandri, Daniel Benten, Boris Fehse
We recently introduced red-green-blue (RGB) marking for clonal cell tracking based on individual color-coding. Here, we applied RGB marking to study clonal development of liver tumors. Immortalized, non-tumorigenic human fetal hepatocytes expressing the human telomerase reverse transcriptase (FH-hTERT) were RGB-marked by simultaneous transduction with lentiviral vectors encoding mCherry, Venus, and Cerulean. Multi-color fluorescence microscopy was used to analyze growth characteristics of RGB-marked FH-hTERT in vitro and in vivo after transplantation into livers of immunodeficient mice with endogenous liver damage (uPA/SCID)...
December 29, 2017: Oncotarget
https://www.readbyqxmd.com/read/29369499/inducibly-decreased-mitf-levels-do-not-affect-proliferation-and-phenotype-switching-but-reduce-differentiation-of-melanoma-cells
#10
Kateřina Vlčková, Jiri Vachtenheim, Jiri Réda, Pavel Horák, Lubica Ondrušová
Melanoma arises from neural crest-derived melanocytes which reside mostly in the skin in an adult organism. Epithelial-mesenchymal transition (EMT) is a tumorigenic programme through which cells acquire mesenchymal, more pro-oncogenic phenotype. The reversible phenotype switching is an event still not completely understood in melanoma. The EMT features and increased invasiveness are associated with lower levels of the pivotal lineage identity maintaining and melanoma-specific transcription factor MITF (microphthalmia-associated transcription factor), whereas increased proliferation is linked to higher MITF levels...
January 25, 2018: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/29362867/the-stem-cell-factor-stimulated-melanogenesis-in-human-melanocytes-can-be-abrogated-by-interrupting-the-phosphorylation-of-msk1-evidence-for-involvement-of-the-p38-msk1-creb-mitf-axis
#11
Takao Niwano, Shuko Terazawa, Hiroaki Nakajima, Genji Imokawa
We recently found that treatment of normal human melanocytes (NHMs) with the antioxidant astaxanthin (AX) suppresses the stem cell factor (SCF)-stimulated protein expression levels of microphthalmia-associated transcription factor (MITF) at 1.5 h and of tyrosinase and endothelin B receptor at 96 h post-treatment. Analysis of the signaling cascade(s) involved revealed that although the major SCF-activated signaling cascade that leads to CREB activation (the c-KIT/Shc/Raf-1/ERK/RSK/CREB axis) is not interrupted, the increased phosphorylation of CREB is significantly abrogated by AX...
January 23, 2018: Archives of Dermatological Research
https://www.readbyqxmd.com/read/29357834/revealing-the-selection-history-of-adaptive-loci-using-genome-wide-scans-for-selection-an-example-from-domestic-sheep
#12
Christina Marie Rochus, Flavie Tortereau, Florence Plisson-Petit, Gwendal Restoux, Carole Moreno-Romieux, Gwenola Tosser-Klopp, Bertrand Servin
BACKGROUND: One of the approaches to detect genetics variants affecting fitness traits is to identify their surrounding genomic signatures of past selection. With established methods for detecting selection signatures and the current and future availability of large datasets, such studies should have the power to not only detect these signatures but also to infer their selective histories. Domesticated animals offer a powerful model for these approaches as they adapted rapidly to environmental and human-mediated constraints in a relatively short time...
January 23, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29332062/cytologic-features-of-malignant-melanoma-with-osteoclast-like-giant-cells
#13
José A Jiménez-Heffernan, Magdalena Adrados, Patricia Muñoz-Hernández, Paloma Fernández-Rico, Ana I Ballesteros-García, Javier Fraga
BACKGROUND: Malignant melanoma showing numerous osteoclast-like giant cells (OGCs) is an uncommon morphologic phenomenon, rarely mentioned in the cytologic literature. The few reported cases seem to have an aggressive clinical behavior. Although most findings support monocyte/macrophage differentiation, the exact nature of OGCs is not clear. CASE: A 57-year-old woman presented with an inguinal lymphadenopathy. Sixteen years before, cutaneous malignant melanoma of the lower limb had been excised...
January 13, 2018: Acta Cytologica
https://www.readbyqxmd.com/read/29317335/integrated-case-control-and-somatic-germline-interaction-analyses-of-melanoma-susceptibility-genes
#14
Yao Yu, Hao Hu, Jiun-Sheng Chen, Fulan Hu, Jerry Fowler, Paul Scheet, Hua Zhao, Chad D Huff
While a number of genes have been implicated in melanoma susceptibility, the role of protein-coding variation in melanoma development and progression remains underexplored. To better characterize the role of germline coding variation in melanoma, we conducted a whole-exome case-control and somatic-germline interaction study involving 322 skin cutaneous melanoma cases from The Cancer Genome Atlas and 3607 controls of European ancestry. We controlled for cross-platform technological stratification using XPAT and conducted gene-based association tests using VAAST 2...
January 6, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29316744/anti-pigmentation-effect-of-phellinus-linteus-fermented-eight-traditional-crude-herbalextracts-in-brown-guinea-pigsof-ultraviolet-b-uvb-induced-hyperpigmentation
#15
Hee-Young Ahn, Young-Moo Choo, Young-Su Cho
We have previously found that mycelia culture broth of eight kinds of traditional herbal extracts fermented with Phellinus linteus (previously named as 8-HsPLCB) not only inhibited melanin and tyrosinase activity, but also reduced the contents of melanogenesis-related proteins including tyrosinase and microphthalmia-associated transcription factor (MITF) in 3- isobutyl-1-methylxanthine (IBMX)-stimulated B16F0 melanoma cells. For a further study, the effect of 8-HsPLCB against skin pigmentation in brown guinea pigs of ultraviolet B (UVB)-induced hyperpigmentation was investigated...
January 11, 2018: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29311116/stim1-activation-of-adenylyl-cyclase-6-connects-ca2-and-camp-signaling-during-melanogenesis
#16
Rajender K Motiani, Jyoti Tanwar, Desingu Ayyappa Raja, Ayushi Vashisht, Shivangi Khanna, Sachin Sharma, Sonali Srivastava, Sridhar Sivasubbu, Vivek T Natarajan, Rajesh S Gokhale
Endoplasmic reticulum (ER)-plasma membrane (PM) junctions form functionally active microdomains that connect intracellular and extracellular environments. While the key role of these interfaces in maintenance of intracellular Ca2+ levels has been uncovered in recent years, the functional significance of ER-PM junctions in non-excitable cells has remained unclear. Here, we show that the ER calcium sensor protein STIM1 (stromal interaction molecule 1) interacts with the plasma membrane-localized adenylyl cyclase 6 (ADCY6) to govern melanogenesis...
January 8, 2018: EMBO Journal
https://www.readbyqxmd.com/read/29302212/ethyl-linoleate-inhibits-%C3%AE-msh-induced-melanogenesis-through-akt-gsk3%C3%AE-%C3%AE-catenin-signal-pathway
#17
Gyeong-A Ko, Somi Kim Cho
Ethyl linoleate is an unsaturated fatty acid used in many cosmetics for its various attributes, such as antibacterial and anti-inflammatory properties and clinically proven to be an effective anti-acne agent. In this study, we investigated the effect of ethyl linoleate on the melanogenesis and the mechanism underlying its action on melanogenesis in B16F10 murine melanoma cells. Our results revealed that ethyl linoleate significantly inhibited melanin content and intracellular tyrosinase activity in α-MSH-induced B16F10 cells, but it did not directly inhibit activity of mushroom tyrosinase...
January 2018: Korean Journal of Physiology & Pharmacology
https://www.readbyqxmd.com/read/29299138/new-role-of-id3-in-melanoma-adaptive-drug-resistance
#18
Sachindra, Lionel Larribère, Daniel Novak, Huizi Wu, Laura Hüser, Karol Granados, Elias Orouji, Jochen Utikal
Adaptive resistance to targeted therapy such as BRAF inhibitors represents in melanoma a major drawback to this otherwise powerful treatment. Some of the underlying molecular mechanisms have recently been described: hyperactivation of the BRAF-MAPK pathway, of the AKT pathway, of the TGFβ/EGFR/PDGFRB pathway, or the low MITF/AXL ratio. Nevertheless, the phenomenon of early resistance is still not clearly understood. In this report, we show that knockdown of neural crest-associated gene ID3 increases the melanoma sensitivity to vemurafenib short-term treatment...
December 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/29277702/the-transcription-factors-gata2-and-mitf-regulate-hdc-gene-expression-in-mast-cells-and-are-required-for-ige-mast-cell-mediated-anaphylaxis
#19
Yapeng Li, Bing Liu, Laura Harmacek, Zijie Long, Jinyi Liang, Kara Lukin, Sonia M Leach, Brian O'Connor, Anthony N Gerber, James Hagman, Axel Roers, Fred D Finkelman, Hua Huang
BACKGROUND: Histamine is a critical mediator of IgE/mast cell-mediated anaphylaxis. Histamine is synthesized by decarboxylating the amino acid histidine, a reaction catalyzed by the Hdc-gene encoded enzyme histidine decarboxylase. However, regulation of the Hdc gene in mast cells is poorly understood. OBJECTIVE: We sought to investigate the in vivo regulation of IgE/mast cell mediated anaphylaxis by transcription factors GATA2 and MITF and the mechanisms by which GATA2 and MITF regulate Hdc gene expression in mouse and human mast cells...
December 22, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/29249622/differential-expression-of-nf2-in-neuroepithelial-compartments-is-necessary-for-mammalian-eye-development
#20
Kyeong Hwan Moon, Hyoung-Tai Kim, Dahye Lee, Mahesh B Rao, Edward M Levine, Dae-Sik Lim, Jin Woo Kim
The optic neuroepithelial continuum of vertebrate eye develops into three differentially growing compartments: the retina, the ciliary margin (CM), and the retinal pigment epithelium (RPE). Neurofibromin 2 (Nf2) is strongly expressed in slowly expanding RPE and CM compartments, and the loss of mouse Nf2 causes hyperplasia in these compartments, replicating the ocular abnormalities seen in human NF2 patients. The hyperplastic ocular phenotypes were largely suppressed by heterozygous deletion of Yap and Taz, key targets of the Nf2-Hippo signaling pathway...
December 12, 2017: Developmental Cell
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