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https://www.readbyqxmd.com/read/30497518/effect-of-urea-extracted-sericin-on-melanogenesis-potential-applications-in-post-inflammatory-hyperpigmentation
#1
Pornanong Aramwit, Natthanej Luplertlop, Tapanee Kanjanapruthipong, Sumate Ampawong
BACKGROUND: Hyperpigmentation disorders such as post-inflammatory hyperpigmentation are major concerns not only in light-skinned people but also in Asian populations with darker skin. The anti-tyrosinase and immunomodulatory effects of sericin have been known for decades. However, the therapeutic effects of sericin on hyperpigmentation disorders have not been well documented. METHODS: In this study, we used an in vitro model to study the anti-tyrosinase, tolerogenic, and anti-melanogenic effects of sericin on Staphylococcus aureus peptidoglycan (PEG)-stimulated melanocytes, dendritic cells (DCs), and artificial skin (MelanoDerm™)...
November 29, 2018: Biological Research
https://www.readbyqxmd.com/read/30450498/algal-oil-rich-in-n-3-polyunsaturated-fatty-acids-suppresses-b16f10-melanoma-lung-metastasis-by-autophagy-induction
#2
Rong-Hui Tan, Feng Wang, Chuan-Long Fan, Xiao-Hong Zhang, Jin-Shun Zhao, Jin-Jie Zhang, Yong Yang, Yang Xi, Zu-Quan Zou, Shi-Zhong Bu
Melanoma is a malignant tumor that arises from epidermal melanocytes with high morbidity and mortality, and currently, there are no effective conventional genotoxic treatments or systematic treatment. Increasing evidence shows that n-3 polyunsaturated fatty acids (PUFAs) exhibit anti-melanoma activity, but their anti-melanoma mechanism remains elusive. Here, C57BL/6 mice were injected with B16F10 melanoma cells via a tail vein to establish a lung metastasis model. n-3 PUFAs were significantly increased in lung metastatic tissues from mice treated with algal oil, especially rich in docosahexaenoic acid (DHA)...
November 19, 2018: Food & Function
https://www.readbyqxmd.com/read/30338860/the-xanthophyll-carotenoid-astaxanthin-has-distinct-biological-effects-to-prevent-the-photo-aging-of-the-skin-even-by-its-post-irradiation-treatment
#3
Genji Imokawa
Exposure of human skin to ultraviolet (UV) radiation causes significant damage to that tissue. The effects of UV on the skin mainly include acute inflammation (erythema/edema) and abnormal keratinization wherein prostaglandin E2 (produced by cyclooxygenase-2), interleukin-8 and transglutaminase 1 (a major regulatory factor of keratinization), play pivotal roles. Later phases of UV-induced skin reactions include hyperpigmentation, wrinkle formation and carcinogenesis, the former two being associated with the UVB-induced production and/or secretion of endothelin-1, stem cell factor and granulocyte macrophage colony stimulatory factor by keratinocytes in the epidermis...
October 19, 2018: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/30317634/intracellular-signaling-mechanisms-involved-in-the-biological-effects-of-the-xanthophyll-carotenoid-astaxanthin-to-prevent-the-photo-aging-of-the-skin-in-a-reactive-oxygen-species-depletion-independent-manner-the-key-role-of-mitogen-and-stress-activated-protein
#4
Genji Imokawa
In the first review, we summarized the biological effects of the xanthophyll carotenoid astaxanthin (AX) to prevent UV-induced cutaneous inflammation, abnormal keratinization, pigmentation and wrinkling in a manner independent of the depletion of reactive oxygen species. In this manuscript, we review what is known about the intracellular signaling mechanisms that are involved in those effects in keratinocytes and in melanocytes. Our research has characterized the intracellular stress signaling mechanism(s) that are involved in the up-regulated expression of genes encoding cyclooxygenase (COX2), interleukin (IL)-8, granulocyte macrophage colony stimulatory factor (GM-CSF) and transglutaminase (TGase)1 in UVB-exposed keratinocytes as well as in the stimulated transcription and/or translation of melanogenic factors, including microphthalmia-associated transcription factor (MITF), in stem cell factor (SCF)-treated melanocytes...
October 13, 2018: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/30194076/whole-transcriptomic-profile-of-sk-mel-3-melanoma-cells-treated-with-the-histone-deacetylase-inhibitor-trichostatin-a
#5
Elizabeth A Mazzio, Karam F A Soliman
BACKGROUND: Malignant melanoma cells can rapidly acquire phenotypic properties making them resistant to radiation and mainline chemotherapies such as decarbonize or kinase inhibitors that target RAS-proto-oncogene independent auto-activated mitogen-activated protein kinases (MAPK)/through dual specificity mitogen-activated protein kinase (MEK). Both drug resistance and inherent transition from melanocytic nevi to malignant melanoma involve the overexpression of histone deacetylases (HDACs) and a B-Raf proto-oncogene (BRAF) mutation...
September 2018: Cancer Genomics & Proteomics
https://www.readbyqxmd.com/read/30021889/antibody-blockade-of-il-15-signaling-has-the-potential-to-durably-reverse-vitiligo
#6
Jillian M Richmond, James P Strassner, Lucio Zapata, Madhuri Garg, Rebecca L Riding, Maggi A Refat, Xueli Fan, Vincent Azzolino, Andrea Tovar-Garza, Naoya Tsurushita, Amit G Pandya, J Yun Tso, John E Harris
Vitiligo is an autoimmune disease of the skin mediated by CD8+ T cells that kill melanocytes and create white spots. Skin lesions in vitiligo frequently return after discontinuing conventional treatments, supporting the hypothesis that autoimmune memory is formed at these locations. We found that lesional T cells in mice and humans with vitiligo display a resident memory (TRM ) phenotype, similar to those that provide rapid, localized protection against reinfection from skin and mucosal-tropic viruses. Interleukin-15 (IL-15)-deficient mice reportedly have impaired TRM formation, and IL-15 promotes TRM function ex vivo...
July 18, 2018: Science Translational Medicine
https://www.readbyqxmd.com/read/29780671/protection-of-cultured-brain-endothelial-cells-from-cytokine-induced-damage-by-%C3%AE-melanocyte-stimulating-hormone
#7
András Harazin, Alexandra Bocsik, Lilla Barna, András Kincses, Judit Váradi, Ferenc Fenyvesi, Vilmos Tubak, Maria A Deli, Miklós Vecsernyés
The blood-brain barrier (BBB), an interface between the systemic circulation and the nervous system, can be a target of cytokines in inflammatory conditions. Pro-inflammatory cytokines tumor necrosis factor-α (TNF-α) and interleukin-1β (IL-1β) induce damage in brain endothelial cells and BBB dysfunction which contribute to neuronal injury. The neuroprotective effects of α-melanocyte stimulating hormone (α-MSH) were investigated in experimental models, but there are no data related to the BBB. Based on our recent study, in which α-MSH reduced barrier dysfunction in human intestinal epithelial cells induced by TNF-α and IL-1β, we hypothesized a protective effect of α-MSH on brain endothelial cells...
2018: PeerJ
https://www.readbyqxmd.com/read/29760713/human-leukocyte-antigen-class-i-alleles-and-the-autoreactive-t-cell-response-in-psoriasis-pathogenesis
#8
REVIEW
Jörg Christoph Prinz
Psoriasis is a complex immune-mediated inflammatory skin disease characterized by T-cell-driven epidermal hyperplasia. It occurs on a strong genetic predisposition. The human leukocyte antigen (HLA)-class I allele HLA-C*06:02 on psoriasis susceptibility locus 1 (PSORS1 on 6p21.3) is the main psoriasis risk gene. Other HLA-class I alleles encoding HLA molecules presenting overlapping peptide repertoires show associations with psoriasis as well. Outside the major histocompatibility complex region, genome-wide association studies identified more than 60 psoriasis-associated common gene variants exerting only modest individual effects...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29620037/association-of-interleukin-1-receptor-antagonist-intron-2-variable-number-of-tandem-repeats-polymorphism-with-vitiligo-susceptibility-in-gujarat-population
#9
Mala Singh, Mohmmad Shoab Mansuri, Shahnawaz D Jadeja, Yogesh S Marfatia, Rasheedunnisa Begum
Background: Vitiligo is a multifactorial, polygenic, autoimmune skin disorder caused by selective destruction of melanocytes. Interleukin 1 receptor antagonist intron 2 polymorphism was found to be associated with various autoimmune disorders. Aims: We aimed to investigate the association of interleukin 1 receptor antagonist intron 2 variable number of tandem repeats polymorphism (rs2234663) with vitiligo to assess interleukin 1 receptor antagonist transcript levels and to perform possible genotype-phenotype correlation...
May 2018: Indian Journal of Dermatology, Venereology and Leprology
https://www.readbyqxmd.com/read/29312598/interleukin-22-participates-in-the-inflammatory-process-of-vitiligo
#10
Jinjin Dong, Xiaohong An, Hui Zhong, Yichuan Wang, Jing Shang, Jia Zhou
Vitiligo is an acquired depigmentary skin inflammatory disorder. The pathogenesis of inflammatory skin disease involves the release of cytokines from keratinocytes, including interleukin (IL)-1β. IL-22 belongs to a family of cytokines structurally related to IL-10, including IL-19, IL-20, IL-24, and IL-26. In contrast to IL-10, IL-22 has proinflammatory activities. Among skin cell populations only keratinocytes are the major targets of IL-22. In the present study, we demonstrated that IL-22 promoting IL-1β secretion from keratinocytes via the Reactive oxygen species (ROS)-NOD-like receptor family, pyrin domain containing 3 (NLRP3)-caspase-1 pathway...
December 12, 2017: Oncotarget
https://www.readbyqxmd.com/read/29241122/modulation-by-neighboring-cells-of-the-responses-and-fate-of-melanoma-cells-irradiated-with-uva
#11
Aleksandra Krzywon, Maria Widel, Krzysztof Fujarewicz, Magdalena Skonieczna, Joanna Rzeszowska-Wolny
UVA radiation, which accounts for about 95% of the solar spectrum, contributes to and may be the etiological factor of skin cancers of which malignant melanoma is the most aggressive. UVA causes oxidative stress in various types of cells in the skin, keratinocyte, melanocytes, and fibroblasts, which is responsible for its cytotoxic effect. Here we used a transwell system to explore how the responses of melanoma cells to a low dose of UVA (20kJ/m2 , ~10% of the minimal erythema dose) are influenced by neighboring co-cultured melanoma cells or fibroblasts...
January 2018: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29042315/il-1%C3%AE-reduces-glua1-phosphorylation-and-its-surface-expression-during-memory-reconsolidation-and-%C3%AE-melanocyte-stimulating-hormone-can-modulate-these-effects
#12
Ivana Machado, Helgi B Schiöth, Mercedes Lasaga, Teresa Scimonelli
Pro-inflammatory cytokines can affect cognitive processes such as learning and memory. Particularly, interleukin-1β (IL-1β) influences hippocampus-dependent memories. We previously reported that administration of IL-1β in dorsal hippocampus impaired contextual fear memory reconsolidation. This effect was reversed by the melanocortin alpha-melanocyte-stimulating hormone (α-MSH). Our results also demonstrated that IL-1β produced a significant decrease in glutamate release from dorsal hippocampus synaptosomes after reactivation of the fear memory...
January 2018: Neuropharmacology
https://www.readbyqxmd.com/read/28921219/effects-of-total-intravenous-anesthesia-with-propofol-on-immuno-endocrine-changes-during-surgical-stress
#13
Tetsuhiro Sakai, David O'Flaherty, Adolf H Giesecke, Akira Kudo, Kazuyoshi Hirota, Akitomo Matsuki
Endocrine factors and cytokines are crucial to host responses to stress and infection. Because surgery is a major stressful condition, it is necessary to understand the influence of specific anesthetic procedures on immune-endocrine responses. The purpose of this study was to compare total intravenous anesthesia with propofol with conventional inhalational anesthesia on circulating cortisol, adrenocorticotropic hormone (ACTH), prolactin, alpha-melanocyte-stimulating hormone (αMSH), and the cytokine, interleukin-6 (IL-6) in healthy patients undergoing tubal ligation...
September 1995: Journal of Anesthesia
https://www.readbyqxmd.com/read/28793632/active-nanofibrous-membrane-effects-on-gingival-cell-inflammatory-response
#14
David-Nicolas Morand, Olivier Huck, Laetitia Keller, Nadia Jessel, Henri Tenenbaum, Jean-Luc Davideau
Alpha-melanocyte stimulating hormone (α-MSH) is involved in normal skin wound healing and also has anti-inflammatory properties. The association of α-MSH to polyelectrolyte layers with various supports has been shown to improve these anti-inflammatory properties. This study aimed to evaluate the effects of nanofibrous membrane functionalized with α-MSH linked to polyelectrolyte layers on gingival cell inflammatory response. Human oral epithelial cells (EC) and fibroblasts (FB) were cultured on plastic or electrospun Poly-#-caprolactone (PCL) membranes with α-MSH covalently coupled to Poly-L-glutamic acid (PGA-α-MSH), for 6 to 24 h...
October 27, 2015: Materials
https://www.readbyqxmd.com/read/28778794/vitiligo-mechanistic-insights-lead-to-novel-treatments
#15
REVIEW
Michael L Frisoli, John E Harris
Vitiligo is an autoimmune disease of the skin characterized by patchy depigmentation. Current treatments are moderately effective at reversing disease by suppressing autoimmune inflammation in the skin and promoting melanocyte regeneration. Recent basic and translational research studies have significantly improved our understanding of disease pathogenesis, which is now leading to emerging treatment strategies based on targeted therapy. Here we discuss important clinical characteristics of vitiligo, current therapies and their limitations, advances in understanding disease pathogenesis, emerging targeted treatments, and strategies to optimize clinical trials to efficiently and effectively test these new treatments...
September 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28754339/il-1-receptor-knockout-mice-develop-epidermal-cysts-and-show-an-altered-innate-immune-response-after-exposure-to-uvb-radiation
#16
Nikhil N Kulkarni, Christopher A Adase, Ling-Juan Zhang, Andrew W Borkowski, Fengwu Li, James A Sanford, Daniel J Coleman, Carlos Aguilera, Arup K Indra, Richard L Gallo
In this study, we observed that mice lacking the IL-1 receptor (IL-1R) (IL1r-/- ) or deficient in IL1-β developed multiple epidermal cysts after chronic UVB exposure. Cysts that developed in IL1r-/- mice were characterized by the presence of the hair follicle marker Sox 9, keratins 10 and 14, and normal melanocyte distribution and retinoid X receptor-α expression. The increased incidence of cysts in IL1r-/- mice was associated with less skin inflammation as characterized by decreased recruitment of macrophages, and their skin also maintained epidermal barrier function compared with wild-type mice...
November 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28378637/primary-tr1-cells-from-metastatic-melanoma-eliminate-tumor-promoting-macrophages-through-granzyme-b-and-perforin-dependent-mechanisms
#17
Hongxia Yan, Ping Zhang, Xue Kong, Xianglian Hou, Li Zhao, Tianhang Li, Xiaozhou Yuan, Hongjun Fu
In malignant melanoma, tumor-associated macrophages play multiple roles in promoting tumor growth, such as inducing the transformation of melanocytes under ultraviolet irradiation, increasing angiogenesis in melanomas, and suppressing antitumor immunity. Because granzyme B- and perforin-expressing Tr1 cells could specifically eliminate antigen-presenting cells of myeloid origin, we examined whether Tr1 cells in melanoma could eliminate tumor-promoting macrophages and how the interaction between Tr1 cells and macrophages could affect the growth of melanoma cells...
April 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28247923/regulatory-t-cell-cytokines-in-patients-with-nonsegmental-vitiligo
#18
Mehtap Kidir, Ayse A Karabulut, Mustafa E Ercin, Pınar Atasoy
In the etiopathogenesis of vitiligo, the role of suppressor cytokines, such as transforming growth factor-β (TGF-β) and interleukin-10 (IL-10), associated with regulatory T-cells (Treg) is not completely known. In this study, the role of Treg-cell functions in the skin of patients with nonsegmental vitiligo was investigated. Lesional and nonlesional skin samples from 30 adult volunteers ranging in age from 18 to 36 years with nonsegmental vitiligo were compared with normal skin area excision specimens of 30 benign melanocytic nevus cases as controls...
May 2017: International Journal of Dermatology
https://www.readbyqxmd.com/read/28214226/cd49a-expression-defines-tissue-resident-cd8-t-cells-poised-for-cytotoxic-function-in-human-skin
#19
Stanley Cheuk, Heinrich Schlums, Irène Gallais Sérézal, Elisa Martini, Samuel C Chiang, Nicole Marquardt, Anna Gibbs, Ebba Detlofsson, Andrea Introini, Marianne Forkel, Charlotte Höög, Annelie Tjernlund, Jakob Michaëlsson, Lasse Folkersen, Jenny Mjösberg, Lennart Blomqvist, Marcus Ehrström, Mona Ståhle, Yenan T Bryceson, Liv Eidsmo
Tissue-resident memory T (Trm) cells form a heterogeneous population that provides localized protection against pathogens. Here, we identify CD49a as a marker that differentiates CD8+ Trm cells on a compartmental and functional basis. In human skin epithelia, CD8+ CD49a+ Trm cells produced interferon-γ, whereas CD8+ CD49a- Trm cells produced interleukin-17 (IL-17). In addition, CD8+ CD49a+ Trm cells from healthy skin rapidly induced the expression of the effector molecules perforin and granzyme B when stimulated with IL-15, thereby promoting a strong cytotoxic response...
February 21, 2017: Immunity
https://www.readbyqxmd.com/read/28164623/decreased-synovial-fluid-%C3%AE-melanocyte-stimulating-hormone-%C3%AE-msh-levels-reflect-disease-severity-in-patients-with-posttraumatic-ankle-osteoarthritis
#20
Guangyu Liu, Yunzhen Chen, Guichun Wang, Jianbing Niu
BACKGROUND: α-Melanocyte-stimulating hormone (α-MSH), an endogenous melanocortin peptide, has been demonstrated to have anti-inflammation effects and protect against cartilage damage. Objective In this study, we aimed to investigate whether α-MSH in ankle joint synovial fluid is associated with the disease severity of posttraumatic ankle osteoarthritis (PTAOA). METHODS: 66 PTAOA patients undergoing ankle arthroscopical debridement or ankle joint replacement were enrolled in the study...
August 1, 2016: Clinical Laboratory
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