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melanogenesis

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https://www.readbyqxmd.com/read/29663691/an-evaluation-of-the-antiaging-properties-of-strawberry-hydrolysate-treatment-enriched-with-l-ascorbic-acid-applied-with-microneedle-mesotherapy
#1
Agata Markiewicz, Malwina Zasada, Anna Erkiert-Polguj, Marzena Wieckowska-Szakiel, Elzbieta Budzisz
BACKGROUND: Mature skin is characterized by a loss of elasticity, hyperpigmentation, and dehydration. L-ascorbic acid stimulates the synthesis of collagen type I, inhibits melanogenesis, and helps to maintain correct skin hydration. Combining microneedle mesotherapy with the application of preparations rich in vitamin C results in better therapeutic effects due to the improved absorption of active substances. The study evaluates the effectiveness of the application of strawberry hydrolysate enriched with L-ascorbic acid using microneedle mesotherapy...
April 16, 2018: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/29660504/idh2-deficiency-accelerates-skin-pigmentation-in-mice-via-enhancing-melanogenesis
#2
Jung Hyun Park, Hyeong Jun Ku, Jin Hyup Lee, Jeen-Woo Park
Melanogenesis is a complex biosynthetic pathway regulated by multiple agents, which are involved in the production, transport, and release of melanin. Melanin has diverse roles, including determination of visible skin color and photoprotection. Studies indicate that melanin synthesis is tightly linked to the interaction between melanocytes and keratinocytes. α-melanocyte-stimulating hormone (α-MSH) is known as a trigger that enhances melanin biosynthesis in melanocytes through paracrine effects. Accumulated reactive oxygen species (ROS) in skin affects both keratinocytes and melanocytes by causing DNA damage, which eventually leads to the stimulation of α-MSH production...
April 6, 2018: Redox Biology
https://www.readbyqxmd.com/read/29642633/structural-requirements-of-alkylglyceryl-l-ascorbic-acid-derivatives-for-melanogenesis-inhibitory-activity
#3
Norihisa Taira, Yushi Katsuyama, Masato Yoshioka, Osamu Muraoka, Toshio Morikawa
l-Ascorbic acid has multifunctional benefits on skin aesthetics, including inhibition of melanin production, and is widely used in cosmetics. It, however, has low stability and poor skin penetration. We hypothesize that alkylglyceryl-l-ascorbic acid derivatives, highly stable vitamin C-alkylglycerol conjugates, would have similar anti-melanogenic activity with better stability and penetration. We test 28 alkylglyceryl-l-ascorbic acid derivatives ( 1 - 28 ) on theophylline-stimulated B16 melanoma 4A5 cells to determine if they inhibit melanogenesis and establish any structure-function relationships...
April 10, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29642438/sesamol-inhibited-melanogenesis-by-regulating-melanin-related-signal-transduction-in-b16f10-cells
#4
Po-Yuan Wu, Ya-Jhen You, Yi-Jung Liu, Chien-Wei Hou, Chin-Sheng Wu, Kuo-Ching Wen, Chien-Yih Lin, Hsiu-Mei Chiang
Melanin is synthesized through a series of interactions catalyzed by melanogenic enzymes such as tyrosinase, dopachrome tautomerase (tyrosinase-related protein-2; TRP-2), and tyrosinase-related protein-1 (TRP-1). Tyrosinase plays a key role in catalysing the initial and limiting steps of melanogenesis. The melanin that results from melanogenesis has the protective effect of absorbing ultraviolet radiation. However, overproduction of melanin, in addition to altering the appearance of skin, may lead to skin disorders such as melasma, solar lentigo, and postinflammatory hyperpigmentation...
April 7, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29616617/formulation-of-chitosan-patch-incorporating-artocarpus-altilis-heartwood-extract-for-improving-hyperpigmentation
#5
Jutatip Kwankaew, Preeyawass Phimnuan, Sombat Wanauppathamkul, Jarupa Viyoch
Artocarpus altilis heartwood extract contains the bioactive compound artocarpin which exhibits melanogenesis inhibitory activity. However, the extract has poor solubility which affects the skin permeability of the compound. A chitosan hydrogel patch incorporating A. altilis heartwood extract was formulated to enhance the delivery of an amount of artocarpin sufficient for depigmenting the skin. The extract was prepared as an o/w microemulsion before blending with an aqueous solution of chitosan. The hydrogel patch was formulated by blending in a 1:1 ratio by weight of 4% w/w chitosan solution and 0...
July 2017: Journal of Cosmetic Science
https://www.readbyqxmd.com/read/29615030/systems-biology-analysis-of-mitogen-activated-protein-kinase-inhibitor-resistance-in-malignant-melanoma
#6
Helma Zecena, Daniel Tveit, Zi Wang, Ahmed Farhat, Parvita Panchal, Jing Liu, Simar J Singh, Amandeep Sanghera, Ajay Bainiwal, Shuan Y Teo, Frank L Meyskens, Feng Liu-Smith, Fabian V Filipp
BACKGROUND: Kinase inhibition in the mitogen activated protein kinase (MAPK) pathway is a standard therapy for cancer patients with activating BRAF mutations. However, the anti-tumorigenic effect and clinical benefit are only transient, and tumors are prone to treatment resistance and relapse. To elucidate mechanistic insights into drug resistance, we have established an in vitro cellular model of MAPK inhibitor resistance in malignant melanoma. METHODS: The cellular model evolved in response to clinical dosage of the BRAF inhibitor, vemurafenib, PLX4032...
April 4, 2018: BMC Systems Biology
https://www.readbyqxmd.com/read/29614755/transplantable-melanomas-in-hamsters-and-gerbils-as-models-for-human-melanoma-sensitization-in-melanoma-radiotherapy-from-animal-models-to-clinical-trials
#7
REVIEW
Martyna Śniegocka, Ewa Podgórska, Przemysław M Płonka, Martyna Elas, Bożena Romanowska-Dixon, Małgorzata Szczygieł, Michał A Żmijewski, Mirosława Cichorek, Anna Markiewicz, Anna A Brożyna, Andrzej T Słominski, Krystyna Urbańska
The focus of the present review is to investigate the role of melanin in the radioprotection of melanoma and attempts to sensitize tumors to radiation by inhibiting melanogenesis. Early studies showed radical scavenging, oxygen consumption and adsorption as mechanisms of melanin radioprotection. Experimental models of melanoma in hamsters and in gerbils are described as well as their use in biochemical and radiobiological studies, including a spontaneously metastasizing ocular model. Some results from in vitro studies on the inhibition of melanogenesis are presented as well as radio-chelation therapy in experimental and clinical settings...
April 1, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29614034/novel-1-e-3-e-5-e-1-6-bis-substituted-phenyl-hexa-1-3-5-triene-analogs-inhibit-melanogenesis-in-b16f10-cells-and-zebrafish
#8
Jisun Oh, Jungeun Kim, Jin Ho Jang, Sangwoo Lee, Chul Min Park, Woo-Keun Kim, Jong-Sang Kim
The present study aimed to evaluate the anti-melanogenic activity of 1,6-diphenyl-1,3,5-hexatriene and its derivatives in B16F10 murine melanoma cells and zebrafish embryos. Twenty five (1 E ,3 E ,5 E )-1,6- bis (substituted phenyl)hexa-1,3,5-triene analogs were synthesized and their non-cytotoxic effects were predictively analyzed using three-dimensional quantitative structure-activity relationship approach. Inhibitory activities of these synthetic compounds against melanin synthesis were determined by evaluating melanin content and melanogenic regulatory enzyme expression in B16F10 cells...
April 3, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29614021/non-metastatic-cutaneous-melanoma-induces-chronodisruption-in-central-and-peripheral-circadian-clocks
#9
Leonardo Vinícius Monteiro de Assis, Maria Nathália Moraes, Keila Karoline Magalhães-Marques, Gabriela Sarti Kinker, Sanseray da Silveira Cruz-Machado, Ana Maria de Lauro Castrucci
The biological clock has received increasing interest due to its key role in regulating body homeostasis in a time-dependent manner. Cancer development and progression has been linked to a disrupted molecular clock; however, in melanoma, the role of the biological clock is largely unknown. We investigated the effects of the tumor on its micro- (TME) and macro-environments (TMaE) in a non-metastatic melanoma model. C57BL/6J mice were inoculated with murine B16-F10 melanoma cells and 2 weeks later the animals were euthanized every 6 h during 24 h...
April 3, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29613836/il-17-induces-cellular-stress-microenvironment-of-melanocytes-to-promote-autophagic-cell-apoptosis-in-vitiligo
#10
Jia Zhou, Xiaohong An, Jinjin Dong, Yichuan Wang, Hui Zhong, Lanlan Duan, Jingjing Ling, Fengfeng Ping, Jing Shang
Vitiligo is a depigmentary disorder that develops as a result of the progressive disappearance of epidermal melanocytes. Stress can precipitate or exacerbate a skin disease through psychosomatic mechanisms. Stress exposure induces vitiligo-like symptoms in mice, as cellular damage to melanocytes cause synthetic pigment loss. Stress also increases IL-17, IL-1β, and antimelanocyte IgG in model mice serum. Up-regulation of the IL-1β transcript in patients suggests its possible role in autoimmune pathogenesis of vitiligo...
April 3, 2018: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29609010/artemisia-asiatica-ethanol-extract-exhibits-anti-photoaging-activity
#11
Deok Jeong, Jongsung Lee, Seong-Gu Jeong, Yo Han Hong, Sulgi Yoo, Sang Yun Han, Ji Hye Kim, Sunggyu Kim, Jin Sic Kim, Young Soo Chung, Jong-Hoon Kim, Young-Su Yi, Jae Youl Cho
ETHNOPHARMACOLOGICAL RELEVANCE: Artemisia asiatica Nakai is a traditional herbal plant that has long been used in anti-inflammatory, anti-infective and skin protective remedies. AIM OF THE STUDY: In this study, traditionally known skin-protective activity of Artemisia asiatica Nakai was examined with its ethanol extract (Aa-EE) under various photoaging conditions using skin-originated cells, and the underlying mechanism was also examined using various types of cells...
March 30, 2018: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29607787/synthesis-and-cytotoxic-evaluation-of-kojic-acid-derivatives-with-inhibitory-activity-on-melanogenesis-in-human-melanoma-cells
#12
Karakaya Gulsah, Ercan Ayse, Oncu Selin, Aytemir Mutlu Dilsiz
In the present study, Mannich bases of kojic acid with the structure of 2-substituted-3-hydroxy-6-hyroxymethyl/chloromethyl/methyl/morpholinomethyl/piperidinylmethyl/pyrrolidinylmethyl-4H-pyran-4-one (compounds 1-23) were synthesized by the reaction of kojic acid/chlorokojic acid/allomaltol and substituted benzylpiperazine derivatives in presence of formaline. To obtain the cyclic amine (morpholine, piperidine and pyrrolidine) derivatives of the 6th-position of chlorokojic acid derivatives, nucleophilic substitutions were carried out...
April 2, 2018: Anti-cancer Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/29605863/increased-tenascin-c-and-dkk1-in-vitiligo-possible-role-of-fibroblasts-in-acral-and-non-acral-disease
#13
Samia M Esmat, Heba H El Hadidi, Rehab A Hegazy, Heba I Gawdat, Amira M Tawdy, Marwa M Fawzy, Dalia M AbdelHalim, Omnia S Sultan, Olfat G Shaker
Recently, multiple culprits-in addition to melanocytes-have been implicated in the pathogenesis of vitiligo. Among those factors are fibroblasts. However, their exact role has not been clearly elucidated. The aim of the study was to evaluate the possible role played by fibroblasts in vitiligo via studying the expression Tenascin C and DKK1 in acral versus non-acral vitiligo lesions. This case-control study included 19 non-segmental vitiligo patients and ten controls. All patients were subjected to thorough clinical evaluation...
March 31, 2018: Archives of Dermatological Research
https://www.readbyqxmd.com/read/29603875/toll-like-receptor-2-and-3-enhance-melanogenesis-and-melanosome-transport-in-human-melanocytes
#14
AutSaaya Koike, Kenshi Yamasaki, Takeshi Yamauchi, Mai Inoue, Ryoko Shimada-Ohmori, Kenichiro Tsuchiyama, Setsuya Aiba
Because little is known about how the innate immune response influences skin pigmentation, we examined whether Toll-like receptor (TLR) agonists participate in melanogenesis and melanosome transportation. We observed that TLR2/2 agonist HKLM and TLR3 agonist Poly(I:C) increased the amount of extracellular melanin from primary human epidermal melanocytes. HKLM, but not Poly(I:C), increased the melanogenic genes such as tyrosinase and dopachrome tautomerase. Poly(I:C) increased the expression of Rab27A, a molecule that facilitates melanosome transport to perimembranous actin filament...
March 30, 2018: Pigment Cell & Melanoma Research
https://www.readbyqxmd.com/read/29584722/pikfyve-regulates-melanosome-biogenesis
#15
Marc C Liggins, Jessica L Flesher, Sohail Jahid, Priya Vasudeva, Victoria Eby, Shunsuke Takasuga, Junko Sasaki, Takehiko Sasaki, Raymond E Boissy, Anand K Ganesan
PIKfyve, VAC14, and FIG4 form a complex that catalyzes the production of PI(3,5)P2, a signaling lipid implicated in process ranging from lysosome maturation to neurodegeneration. While previous studies have identified VAC14 and FIG4 mutations that lead to both neurodegeneration and coat color defects, how PIKfyve regulates melanogenesis is unknown. In this study, we sought to better understand the role of PIKfyve in melanosome biogenesis. Melanocyte-specific PIKfyve knockout mice exhibit greying of the mouse coat and the accumulation of single membrane vesicle structures in melanocytes resembling multivesicular endosomes...
March 27, 2018: PLoS Genetics
https://www.readbyqxmd.com/read/29578181/identification-of-key-genes-related-to-high-risk-gastrointestinal-stromal-tumors-using-bioinformatics-analysis
#16
Shuan Jin, Wenhua Zhu, Jun Li
Aim: The purpose of this study was to identify predictive biomarkers used for clinical therapy and prognostic evaluation of high-risk gastrointestinal stromal tumors (GISTs). Materials and Methods: In this study, microarray data GSE31802 were used to identify differentially expressed genes (DEGs) between high-risk GISTs and low-risk GISTs. Then, enrichment analysis of DEGs was conducted based on the gene ontology and kyoto encyclopedia of genes and genomes pathway database...
2018: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/29576710/capsaicin-reverses-the-inhibitory-effect-of-licochalcone-a-%C3%AE-arbutin-on-tyrosinase-expression-in-b16-mouse-melanoma-cells
#17
Jun-Hui Hong, Huo-Ji Chen, Shi-Jian Xiang, Si-Wei Cao, Bai-Chao An, Shi-Fa Ruan, Bin Zhang, Li-Dong Weng, Hong-Xia Zhu, Qiang Liu
Introduction: Melanin is synthesized by melanocytes, which are located in the basal layer of the skin. After synthesis, melanin is further deposited on the surface of the skin to form black spots or chloasma. Tyrosinase is a rate-limiting enzyme that plays an important role in melanogenesis. Currently, there are many drugs that inhibit tyrosinase expression to further reduce melanogenesis. Nevertheless, some of these could reverse the pharmacological effect of other drugs, when used simultaneously...
January 2018: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29556371/%C3%AE-viniferin-improves-facial-hyperpigmentation-via-accelerating-feedback-termination-of-camp-pka-signaled-phosphorylation-circuit-in-facultative-melanogenesis
#18
Cheong-Yong Yun, Seon Mi Ko, Yong Pyo Choi, Beom Joon Kim, Jungno Lee, Jae Mun Kim, Ju Yeon Kim, Jin Yong Song, Song-Hee Kim, Bang Yeon Hwang, Jin Tae Hong, Sang-Bae Han, Youngsoo Kim
Rationale: cAMP up-regulates microphthalmia-associated transcription factor subtype M (MITF-M) and tyrosinase (Tyro) in the generation of heavily pigmented melanosomes. Here, we communicate a therapeutic mechanism of hyperpigmented disorder by α-viniferin, an active constituent of Caragana sinica . Methods: We used cAMP-elevated melanocyte cultures or facial hyperpigmented patches for pigmentation assays, and applied immunoprecipitation, immunobloting, RT-PCR or reporter gene for elucidation of the antimelanogenic mechanism...
2018: Theranostics
https://www.readbyqxmd.com/read/29552155/the-effects-of-vitamin-b-6-compounds-on-cell-proliferation-and-melanogenesis-in-b16f10-melanoma-cells
#19
Taisuke Matsuo, Aki Fujiwara, Kazuhiro Nakamura, Yasuyuki Sadzuka
B16F10 murine melanoma cells are frequently used for the study of cancer and melanogenesis. The cells are usually cultured in Dulbecco's Modified Eagle Medium, with the addition of 20 µM pyridoxal (PL) or pyridoxine (PN) for vitamin B6 . The difference between these vitamin B6 compounds is thought not to affect cell proliferation, whereas their influence on other physiological effects is poorly understood. In the present study, the effects of PL and PN on cell proliferation and melanogenesis in B16F10 cells were compared...
April 2018: Oncology Letters
https://www.readbyqxmd.com/read/29540314/tetrahydrofuran-lignans-melanogenesis-inhibitors-from-premna-integrifolia-wood-collected-in-myanmar
#20
Nwet Nwet Win, So-Yeun Woo, Hla Ngwe, Prema, Chin Piow Wong, Takuya Ito, Yasuko Okamoto, Masami Tanaka, Hiroshi Imagawa, Yoshinori Asakawa, Ikuro Abe, Hiroyuki Morita
Two new tetrahydrofuran lignans, taungtangyiols A (1) and B (2), and eight known furofuran lignans (3-10), were isolated from the chloroform extract of Premna integrifolia wood collected in Myanmar. Their structures were elucidated by extensive spectroscopic techniques. The X-ray crystal structure of 1 clearly indicated its relative configuration. Taungtangyiols A (1) and B (2) inhibited the deposition of melanin in B16F10 mouse melanoma cells, with IC50 values of 50.7 and 40.9 μM, respectively, without notable cytotoxicity...
March 11, 2018: Fitoterapia
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