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https://www.readbyqxmd.com/read/29020973/the-%C3%AE-melanocyte-stimulating-hormone-peroxisome-proliferator-activated-receptor-%C3%AE-pathway-down-regulates-proliferation-in-melanoma-cell-lines
#1
Enrica Flori, Eleonora Rosati, Giorgia Cardinali, Daniela Kovacs, Barbara Bellei, Mauro Picardo, Vittoria Maresca
BACKGROUND: The α-Melanocyte Stimulating Hormone (αMSH)/Melanocortin-1 receptor (MC1R) interaction promotes melanogenesis through the cAMP/PKA pathway. The direct induction of this pathway by Forskolin (FSK) is also known to enhance melanocyte proliferation. αMSH acts as a mitogenic agent in melanocytes and its effect on proliferation of melanoma cells is less known. We previously identified the αMSH/Peroxisome Proliferator Activated Receptor (PPARγ) pathway as a new pathway on the B16-F10 mouse melanoma cell line...
October 11, 2017: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/28972038/comparative-transcriptome-and-histological-analyses-provide-insights-into-the-prenatal-skin-pigmentation-in-goat-capra-hircus
#2
Hangxing Ren, Gaofu Wang, Jing Jiang, Jie Li, Lin Fu, Liangjia Liu, Nianfu Li, Jinhong Zhao, Xiaoyan Sun, Li Zhang, Haiyan Zhang, Peng Zhou
The Youzhou dark goat is the natural mutant characterizing the dark skin of whole body including the visible mucous membranes. In the present study, we characterized 100-day-old fetal skin at the histomorphological and transcriptomic levels in dark-skinned (Youzhou Dark goat) and white-skinned (Yudong White goat) goats using deep RNA-sequencing, qPCR, and histological methods. Histological analysis indicated that there were marked differences in both melanin distribution and epidermal ultrastructure between the hyperpigmented and normal skin in two breeds of goat...
September 29, 2017: Physiological Genomics
https://www.readbyqxmd.com/read/28963476/comparative-transcriptome-analysis-of-mink-neovison-vison-skin-reveals-the-key-genes-involved-in-the-melanogenesis-of-black-and-white-coat-colour
#3
Xingchao Song, Chao Xu, Zongyue Liu, Zhigang Yue, Linling Liu, Tongao Yang, Bo Cong, Fuhe Yang
Farmed mink (Neovison vison) is one of the most important fur-bearing species worldwide, and coat colour is a crucial qualitative characteristic that contributes to the economic value of the fur. To identify additional genes that may play important roles in coat colour regulation, Illumina/Solexa high-throughput sequencing technology was used to catalogue the global gene expression profiles in mink skin with two different coat colours (black and white). RNA-seq analysis indicated that a total of 12,557 genes were differentially expressed in black versus white minks, with 3,530 genes up-regulated and 9,027 genes down-regulated in black minks...
September 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28960463/mc1r-genotype-and-psoriasis-is-there-a-link-revealing-a-phenotypic-difference-a-pilot-study
#4
Stefania Guida, Caterina Foti, Michele Manganelli, Nicola Bartolomeo, Giovanni Pellacani, Domenico Bonamonte, Raffaele Filotico, Gabriella Guida
Psychological stress is known to trigger inflammatory skin diseases such as psoriasis. Recently, levels of hormones derived from pre-opiomelanocortin (POMC) were related with different types of psoriasis. (1) In particular, α -MSH, a POMC derivative, is known for its role in pigmentation and for its anti-inflammatory activity. Accordingly, it has been recently suggested for the treatment of imiquimod-induced psoriasis.(2,3) This article is protected by copyright. All rights reserved.
September 28, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28952157/digest-frog-spots-show-broken-receptors-might-work-harder
#5
Theresa M Grieco
Posso-Terranova and Andrés (2017) used harlequin poison frogs to investigate the genetic basis of pigmentation evolution and variation. Using a candidate gene approach, they clearly delimited the origins and distribution of MC1R haplotypes and associated them with key pigmentation phenotypes on multiple levels. They demonstrated that MC1R-related cellular phenotypes and associated protein truncations evolved at least twice to produce dark dorsal skin colors in different clades. This article is protected by copyright...
September 27, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28950052/melanocortin-1-receptor-mc1r-polymorphisms-influence-on-size-and-dermoscopic-features-of-nevi
#6
María Gabriela Vallone, Gemma Tell-Marti, Miriam Potrony, Aida Rebollo-Morell, Celia Badenas, Joan Anton Puig-Butille, Pol Gimenez-Xavier, Cristina Carrera, Josep Malvehy, Susana Puig
The Melanocortin 1 receptor (MC1R) is a highly polymorphic gene. The loss-of-function MC1R variants ("R") have been strongly associated with red hair colour phenotype and an increased melanoma risk. We sequenced the MC1R gene in 175 healthy individuals to assess the influence of MC1R on nevus phenotype. We identified that MC1R variant carriers had larger nevi both on the back (p-value = 0.016, adjusted for multiple parameters (adj. p-value)) and on the upper limbs (adj. p-value = 0.007). Specifically, we identified a positive association between the "R'' MC1R variants and visible vessels in nevi (p-value = 0...
September 26, 2017: Pigment Cell & Melanoma Research
https://www.readbyqxmd.com/read/28947386/human-melanocortin-1-receptor-mediated-ubiquitination-of-nonvisual-arrestins-role-of-mahogunin-ring-finger-1-e3-ligase
#7
Marta Abrisqueta, Concepción Olivares, Cecilia Herraiz, María Castejón-Griñán, Julia Sirés-Campos, José C García-Borrón, Celia Jiménez-Cervantes
Signaling from the melanocortin 1 receptor (MC1R), a Gs protein-coupled receptor (GPCR) crucial for melanocyte proliferation and differentiation, is regulated by cytosolic β-arrestins (ARRBs). MC1R signaling is also negatively modulated by the E3-ubiquitin ligase Mahogunin Ring Finger-1 (MGRN1), whose mutation causes hyperpigmentation, congenital heart defects and neurodegeneration in mice. We showed previously that although MC1R interacts stably with human ARRB1 or ARRB2, only ARRB2 mediates receptor desensitization and internalization...
September 22, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28916831/the-melanocortin-signaling-camp-axis-accelerates-repair-and-reduces-mutagenesis-of-platinum-induced-dna-damage
#8
Stuart G Jarrett, Katharine M Carter, Brent J Shelton, John A D'Orazio
Using primary melanocytes and HEK293 cells, we found that cAMP signaling accelerates repair of bi- and mono-functional platinum-induced DNA damage. Elevating cAMP signaling either by the agonistic MC1R ligand melanocyte stimulating hormone (MSH) or by pharmacologic cAMP induction by forskolin enhanced clearance of intrastrand cisplatin-adducts in melanocytes or MC1R-transfected HEK293 cells. MC1R antagonists human beta-defensin 3 and agouti signaling protein blocked MSH- but not forskolin-mediated enhancement of platinum-induced DNA damage...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28916587/melanoma-risk-variants-prevent-mc1r-palmitoylation-and-activation
#9
(no author information available yet)
Palmitoylation-deficient MC1R variants accelerate BRAF(V60E)-driven melanomagenesis.
September 15, 2017: Cancer Discovery
https://www.readbyqxmd.com/read/28915638/oleoylethanolamide-inhibits-%C3%AE-melanocyte-stimulating-hormone-stimulated-melanogenesis-via-erk-akt-and-creb-signaling-pathways-in-b16-melanoma-cells
#10
Juan Zhou, Tong Ren, Ying Li, Anran Cheng, Wanyi Xie, Lanxi Xu, Lu Peng, Jinbin Lin, Lianxiang Lian, Yong Diao, Xin Jin, Lichao Yang
The present study aimed to examine the potential inhibitory activity of oleoylethanolamide (OEA) on α-melanocyte stimulating hormone (α-MSH)-stimulated melanogenesis and the molecular mechanism(s) involved in the process in B16 mouse melanoma cells. Our data demonstrated that OEA markedly inhibited melanin synthesis and tyrosinase activity in α-MSH-stimulated B16 cells. In addition, the expression of melanogenesis-related proteins, such as melanocortin-1 receptor (MC1R), microphthalmia-associated transcription factor (MITF), tyrosinase-related protein-1 (TRP-1) and tyrosinase, was suppressed in a concentration-dependent manner by OEA...
August 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28877366/melanocortin-receptor-subtypes-are-expressed-on-cells-in-the-oligodendroglial-lineage-and-signal-acth-protection
#11
Joyce A Benjamins, Liljana Nedelkoska, Robert P Lisak
ACTH, a melanocortin peptide used to treat multiple sclerosis (MS) relapses, acts by stimulating adrenal corticosteroid (CS) production via melanocortin receptor 2 (MC2R), but it may also exert a therapeutic effect independent of CS by stimulating other melanocortin receptors (MCR) distributed in many tissues, including the brain. We reported that oligodendroglia (OL) and oligodendroglial precursor cells (OPC) express MC4R, and that ACTH 1-39 protects OL and OPC in vitro from cell death induced by mechanisms likely involved in white matter damage in MS...
September 6, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/28869973/palmitoylation-dependent-activation-of-mc1r-prevents-melanomagenesis
#12
Shuyang Chen, Bo Zhu, Chengqian Yin, Wei Liu, Changpeng Han, Baoen Chen, Tongzheng Liu, Xin Li, Xiang Chen, Chunying Li, Limin Hu, Jun Zhou, Zhi-Xiang Xu, Xiumei Gao, Xu Wu, Colin R Goding, Rutao Cui
The melanocortin-1 receptor (MC1R), a G-protein-coupled receptor, has a crucial role in human and mouse pigmentation. Activation of MC1R in melanocytes by α-melanocyte-stimulating hormone (α-MSH) stimulates cAMP signalling and melanin production and enhances DNA repair after ultraviolet irradiation. Individuals carrying MC1R variants, especially those associated with red hair colour, fair skin and poor tanning ability (denoted as RHC variants), are associated with higher risk of melanoma. However, how MC1R activity is modulated by ultraviolet irradiation, why individuals with red hair are more prone to developing melanoma, and whether the activity of RHC variants might be restored for therapeutic benefit are unknown...
September 21, 2017: Nature
https://www.readbyqxmd.com/read/28861897/beyond-mean-allelic-effects-a-locus-at-the-major-color-gene-mc1r-associates-also-with-differing-levels-of-phenotypic-and-genetic-co-variance-for-coloration-in-barn-owls
#13
Luis M San-Jose, Valérie Ducret, Anne-Lyse Ducrest, Céline Simon, Alexandre Roulin
The mean phenotypic effects of a discovered variant help to predict major aspects of the evolution and inheritance of a phenotype. However, differences in the phenotypic variance associated to distinct genotypes are often overlooked despite being suggestive of processes that largely influence phenotypic evolution, such as interactions between the genotypes with the environment or the genetic background. We present empirical evidence for a mutation at the melanocortin-1-receptor gene, a major vertebrate coloration gene, affecting phenotypic variance in the barn owl, Tyto alba...
October 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28851815/epac-rap1-axis-mediated-switch-in-the-response-of-primary-and-metastatic-melanoma-to-cyclic-amp
#14
Carlos I Rodriguez, Edgardo Castro-Perez, Kirthana Prabhakar, Laura Block, B Jack Longley, Jaclyn A Wisinski, Michelle E Kimple, Vijayasaradhi Setaluri
Cyclic AMP (cAMP) is an important second messenger that regulates a wide range of physiological processes. In mammalian cutaneous melanocytes, cAMP-mediated signaling pathways activated by G-protein coupled receptors (GPCRs), like melanocortin 1 receptor (MC1R), play critical roles in melanocyte homeostasis including cell survival, proliferation and pigment synthesis. Impaired cAMP signaling is associated with increased risk of cutaneous melanoma. Whereas mutations in mitogen activated protein kinase (MAPK) pathway components are the most frequent oncogenic drivers of melanoma, the role of cAMP in melanoma is not well understood...
August 29, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/28842324/associations-of-mc1r-genotype-and-patient-phenotypes-with-braf-and-nras-mutations-in-melanoma
#15
Nancy E Thomas, Sharon N Edmiston, Peter A Kanetsky, Klaus J Busam, Anne Kricker, Bruce K Armstrong, Anne E Cust, Hoda Anton-Culver, Stephen B Gruber, Li Luo, Irene Orlow, Anne S Reiner, Richard P Gallagher, Roberto Zanetti, Stefano Rosso, Lidia Sacchetto, Terence Dwyer, Eloise A Parrish, Honglin Hao, David C Gibbs, Jill S Frank, David W Ollila, Colin B Begg, Marianne Berwick, Kathleen Conway
Associations of MC1R with BRAF mutations in melanoma have been inconsistent between studies. We sought to determine for 1227 participants in the international population-based Genes, Environment and Melanoma (GEM) study whether MC1R and phenotypes were associated with melanoma BRAF/NRAS subtypes. We used logistic regression adjusted by age, sex, and study design features and examined effect modifications. BRAF+ were associated with younger age, blond/light brown hair, increased nevi, and less freckling and NRAS+ with older age relative to WT (BRAF-/NRAS-) melanomas (all P<0...
August 22, 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28837761/diversification-and-convergence-of-aposematic-phenotypes-truncated-receptors-and-cellular-arrangements-mediate-rapid-evolution-of-coloration-in-harlequin-poison-frogs
#16
A Posso-Terranova, J A Andres
Aposematic signals represent one of the classical systems to study evolution and, as such, they have received considerable empirical and theoretical investigation. Despite the extensive literature on aposematic coloration, much uncertainty remains about genetic changes responsible for the repeated evolution of similar signals in multiple lineages. Here, we study the diversification and convergence of coloration among lineages of aposematic harlequin poison frogs (O. histrionica complex). Our results suggest that different background phenotypes, showing different color and/or luminance contrast, have evolved independently at least twice in this group...
August 24, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28835664/the-activation-of-ppar%C3%AE-by-2-4-6-octatrienoic-acid-protects-human-keratinocytes-from-uvr-induced-damages
#17
Enrica Flori, Arianna Mastrofrancesco, Daniela Kovacs, Barbara Bellei, Stefania Briganti, Vittoria Maresca, Giorgia Cardinali, Mauro Picardo
Increasing attention is addressed to identify products able to enhance skin photoprotection and to prevent skin carcinogenesis. Several studies have demonstrated that the α-melanocyte stimulating hormone (αMSH), acting on a functional MC1R, provides a photoprotective effect by inducing pigmentation, antioxidants and DNA repair. We discovered a link between αMSH and the nuclear receptor Peroxisome Proliferator-Activated Receptor-γ (PPARγ), suggesting that some of the αMSH protective effects may be dependent on PPARγ transcriptional activity...
August 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28805337/genetic-favoring-of-pheomelanin-based-pigmentation-limits-physiological-benefits-of-coloniality-in-lesser-kestrels-falco-naumanni
#18
Ismael Galván, Virginia Moraleda, Ignacio Otero, Ernesto Álvarez, Ângela Inácio
Pheomelanin contributes to the pigmentation phenotype of animals by producing orange and light brown colors in the integument. However, pheomelanin synthesis in melanocytes requires consumption of glutathione (GSH), the most important intracellular antioxidant. Therefore, a genetic control favoring the production of large amounts of pheomelanin for pigmentation may lead to physiological costs under environmental conditions that promote oxidative stress. We investigated this possibility in the context of breeding coloniality, a reproductive strategy that may affect oxidative stress...
August 14, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28770057/adaptive-molecular-evolution-of-mc1r-gene-reveals-the-evidence-for-positive-diversifying-selection-in-indigenous-goat-populations
#19
Hafiz Ishfaq Ahmad, Guiqiong Liu, Xunping Jiang, Chenhui Liu, Yuqing Chong, Huang Huarong
Detecting signatures of selection can provide a new insight into the mechanism of contemporary breeding and artificial selection and further reveal the causal genes associated to the phenotypic variation. However, the signatures of selection on genes entailing for profitable traits between Chinese commercial and indigenous goats have been poorly interpreted. We noticed footprints of positive selection at MC1R gene containing SNPs genotyped in five Chinese native goat breeds. An experimental distribution of FST was built based on approximations of FST for each SNP across five breeds...
July 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28748531/sri-lankan-pig-ancestry-revealed-by-mitochondrial-dna-y-chromosome-and-mc1r
#20
Nalini Yasoda Hirimuthugoda, Adeniyi C Adeola, Patthamesthrige Wimal Anthony Perera, Xing Chen, Weligalle Wedarallage Dewar Asoka Gunawardena, Humpita Gamaralalage Thilini Nisanka Gunawardana, Ting-Ting Yin, Ming-Shan Wang, Gui-Mei Li, Zhao-Li Ding, Wen-Zhi Wang, Hai-Bing Xie, Min-Sheng Peng, Ya-Ping Zhang
No abstract text is available yet for this article.
July 27, 2017: Animal Genetics
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