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Experimental Dermatology

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https://www.readbyqxmd.com/read/28192606/metformin-alleviates-aging-cellular-phenotypes-in-hutchinson-gilford-progeria-syndrome-dermal-fibroblasts
#1
Seul-Ki Park, Ok Sarah Shin
Metformin is a popular antidiabetic biguanide, which has been considered as a candidate drug for cancer treatment and aging prevention. Hutchinson-Gilford progeria syndrome (HGPS) is a devastating disease characterized by premature aging and severe age-associated complications leading to death. The effects of metformin on HGPS dermal fibroblasts remain largely undefined. In this study, we investigated whether metformin could exert a beneficial effect on nuclear abnormalities and delay senescence in fibroblasts derived from HGPS patients...
February 13, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28191690/mutational-profiling-of-acral-melanomas-in-korean-populations
#2
Joon Ho Shim, Hyun-Tae Shin, Jiho Park, Ji-Hye Park, Jong-Hee Lee, Jun-Mo Yang, Duk-Hwan Kim, Kee-Taek Jang, Dong-Youn Lee
The proportion of acral melanoma (AM) is much higher in Asian populations than in Caucasians populations. Although mutational profiles associated with AM have been discovered in Caucasian populations, knowledge of its genetic alterations in the Asian populations is limited. To describe the molecular nature of AM in Korean patients, we performed mutational profilinge of AM and matched normal tissues of in patients. Fifty-one formalin-fixed paraffin-embedded AM samples and 32 matched pairs of from patients' saliva DNA were analyzed by next-generation sequencing...
February 13, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28191688/functional-expression-of-olfactory-receptors-in-human-primary-melanoma-and-melanoma-metastasis
#3
Lian Gelis, Nikolina Jovancevic, Falk Bechara, Eva M Neuhaus, Hanns Hatt
We identified the olfactory receptor 51E2 in human melanoma and have measured both OR51E2 mRNA and protein expression in melanoma tissue sections. qPCR analysis revealed that the receptor is upregulated in melanoma cells compared to normal melanocytes, indicating that OR51E2 may play a role in early melanoma development and progression. Activation of endogenous OR51E2 in cultured cells derived from metastatic and vertical-growth phase (VGP) by its ligand β-ionone results in an increase in the intracellular Ca(2+) concentration...
February 13, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28191683/immediate-type-allergic-and-protease-mediated-reactions-are-involved-in-scratching-behavior-induced-by-topical-application-of-dermatophagoides-farinae-extract-in-nc-nga-mice
#4
Yoshihito Yamada, Yuhki Ueda, Aki Nakamura, Shoji Kanayama, Rie Tamura, Kei Hashimoto, Tatsumi Matsumoto, Ritsuko Ishii
Atopic dermatitis (AD)-like dermatitis can be induced by repeated topical application of an ointment containing Dermatophagoides farinae body (Dfb) extract in NC/Nga mice. This AD-like murine model also exhibits a biphasic increase in the number of scratching behavior after topical application of Dfb ointment. In this study, we investigated the possible mechanisms underlying the scratching behavior in each phase. An increase in the content of mast cell derived mediators such as histamine and 5-hydroxytryptamine in the lesional skin and increased vascular permeability were observed in the early phase after the Dfb ointment application...
February 13, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28191680/friends-or-foes-host-defense-antimicrobial-peptides-and-proteins-in-human-skin-diseases
#5
REVIEW
François Niyonsaba, Chanisa Kiatsurayanon, Panjit Chieosilapatham, Hideoki Ogawa
Host defense peptides/proteins (HDPs), also known as antimicrobial peptides/proteins (AMPs), are key molecules in the cutaneous innate immune system. AMPs/HDPs historically exhibit broad-spectrum killing activity against bacteria, enveloped viruses, fungi and several parasites. Recently, AMPs/HDPs were shown to have important biological functions, including inducing cell proliferation, migration and differentiation; regulating inflammatory responses; controlling the production of various cytokines/chemokines; promoting wound healing; and improving skin barrier function...
February 13, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28191677/uvb-represses-melanocyte-cell-migration-and-acts-through-%C3%AE-catenin
#6
Juliette U Bertrand, Valérie Petit, Elke Hacker, Irina Berlin, Nicholas K Hayward, Marie Pouteaux, Evelyne Sage, David C Whiteman, Lionel Larue
The exposure of skin to ultraviolet (UV) radiation can have both beneficial and deleterious effects: it can lead, for instance, to increased pigmentation and vitamin D synthesis but also to inflammation and skin cancer. UVB may induce genetic and epigenetic alterations, and have reversible effects associated with post-translational and gene regulation modifications. β-catenin is a main driver in melanocyte development; although infrequently mutated in melanoma, its cellular localization and activity is frequently altered...
February 13, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28191676/discovery-of-skin-lymphocytes-was-a-game-changer-in-experimental-dermatology
#7
Tiago R Matos, Menno A de Rie
A substantial part of ongoing research in experimental dermatology focuses on skin T cells - for that reason we find important to highlight the pioneering work of Jan D. Bos et al. from 1987 (The skin immune system (SIS): Distribution and immunophenotype of lymphocyte subpopulations in normal skin). This key article set the record straight, once and for all, about the presence of lymphocytes in healthy skin; characterized the immunophenotypes of subpopulations, quantified these cells, and studied their location...
February 13, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28191675/polyphenol-rich-apple-extract-inhibits-dexamethasone-induced-sebaceous-lipids-production-by-regulating-srebp1-expression
#8
LETTER
Kyung-Eun Lee, Jong-Kyung Youm, Weon Ju Lee, Seunghyun Kang, Youn Joon Kim
No abstract text is available yet for this article.
February 13, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28191674/induced-histamine-regulates-ni-elution-from-an-implanted-ni-wire-in-mice-by-downregulating-neutrophil-migration
#9
Yu Kishimoto, Sanki Asakawa, Taiki Sato, Takayuki Takano, Takahisa Nakajyo, Natsumi Mizuno, Ryosuke Segawa, Takeo Yoshikawa, Masahiro Hiratsuka, Kazuhiko Yanai, Hiroshi Ohtsu, Noriyasu Hirasawa
Histamine regulates various inflammatory reactions. We have reported that the expression of histidine decarboxylase (HDC) was induced by subcutaneous implantation of nickel (Ni) wire. However, the source and functions of histamine in Ni elution and Ni wire-induced inflammation have not completely studied. We aimed to elucidate the effects of de novo synthesized histamine on leukocyte infiltration and Ni elution. Implantation of Ni wire induced an increase in the Ni ion content of the surrounding tissues and serum and in the mRNA levels of HDC, a histamine-producing enzyme, macrophage inflammatory protein-2 (MIP-2), a chemoattractant for neutrophils, and monocyte chemoattractant protein-1 (MCP-1), a chemoattractant for monocytes...
February 13, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28191671/filaggrin-has-evolved-from-an-s100-fused-type-protein-sftp-gene-present-in-a-common-ancestor-of-amphibians-and-mammals
#10
LETTER
Veronika Mlitz, Tajamul Hussain, Erwin Tschachler, Leopold Eckhart
No abstract text is available yet for this article.
February 13, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28156021/loss-of-cutaneous-microbial-diversity-during-first-three-weeks-of-life-in-very-low-birth-weight-infants
#11
A Salava, V Aho, E Lybeck, P Pereira, L Paulin, I Nupponen, A Ranki, P Auvinen, S Andersson, A Lauerma
Neonatal sepsis (NS) is a frequent problem in neonatal intensive care, especially in preterm and very low birth weight (VLBW) infants. The objective of the study was to characterize the cutaneous bacterial microbiome in VLBW infants treated in the neonatal intensive care unit (NICU). Non-invasive skin microbiome specimens were taken repeatedly from 12 VLBW infants during treatment in NICU starting on the first day of life. All infants received benzylpenicillin and netilmicin during the first 1-5 postnatal days...
February 3, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28156020/matrix-meets-inflammation-and-dna-repair-meeting-report-of-the-3-rd-adf-round-table
#12
Johanna M Brandner, Steffen Emmert, Kerstin Wolk, Ralf J Ludwig
No abstract text is available yet for this article.
February 3, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28156019/excessive-angiogenesis-associated-with-psoriasis-as-a-cause-for-cardiovascular-ischaemia
#13
Nina Malecic, Helen S Young
Psoriasis, a common disease affecting 2-3% of the UK population, produces significant impairment of quality of life and is an immense burden on sufferers and their families. Psoriasis is associated with significant cardiovascular co-morbidity and the metabolic syndrome. Angiogenesis, a relatively under-researched component of psoriasis, is a key factor in pathogenesis of psoriasis and also contributes to the development of atherosclerosis. Vascular endothelial growth factor (VEGF) is a well established mediator of pathological angiogenesis which is upregulated in psoriasis...
February 3, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28155250/overcoming-cell-death-resistance-in-skin-cancer-therapy-novel-translational-perspectives
#14
M Feoktistova, D Panayotova-Dimitrova
In the last decade, significant progress has been made in understanding skin cancer cell death resistance mechanisms, and a number of new treatment strategies have been developed. Systematic approach genomic studies of various cancer types have opened new possibilities for the development of anti-cancer therapies. However, there are still fundamental gaps in the challenging biomedical puzzle, which will form a complete picture for curing cancer. Thus, herein, we describe some of the current cancer treatment strategies and discuss additional cell signalling pathways that could be potential targets for skin cancer treatment...
February 3, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28155238/dickkopf-1-is-involved-in-dexamethasone-mediated-hair-follicle-regression
#15
Mi Hee Kwack, Jun Ho Lee, Chang Hoon Seo, Jung Chul Kim, Moon Kyu Kim, Young Kwan Sung
The stress-related neurohormones including glucocorticoids (GCs) are secreted by hair follicles (HFs) and GCs suppress murine hair growth in vivo. In this study, we found that dexamethasone (Dex), a synthetic GC, increased the expression of dickkopf-1 (DKK1), a known catagen inducer, in dermal papilla (DP) cells but not in follicular keratinocytes. The neutralizing DKK1 antibody significantly attenuated the Dex-induced inhibition of human hair shaft elongation. In addition, the neutralizing Dkk1 antibody delayed Dex-induced catagen in mice...
February 3, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28111846/unique-mouse-monoclonal-antibodies-reactive-with-maturation-related-epitopes-on-type-vii-collagen
#16
Taihei Hayakawa, Yoshiaki Hirako, Kwesi Teye, Atsunari Tsuchisaka, Hiroshi Koga, Norito Ishii, Tadashi Karashima, Minori Kaneda, Yuka Oyu, Chiharu Tateishi, Koji Sugawara, Ayano Yonamine, Satoru Shinkuma, Hiroshi Shimizu, Hideo Fukano, Kazuo Shimozato, Ngon T Nguyen, M Peter Marinkovich, Daisuke Tsuruta, Takashi Hashimoto
In this study, we generated a new set of monoclonal antibodies (mAbs) to bovine and human type VII collagen (COL7) by immunizing mice with bovine cornea-derived basement membrane zone (BMZ) fraction. The 4 mAbs, tentatively named as COL7-like mAbs, showed speckled subepidermal staining in addition to linear BMZ staining of normal human skin and bovine cornea, a characteristic immunofluorescence feature of COL7, but showed no reactivity with COL7 by in vitro biochemical analyses. Taking advantage of the phenomenon that COL7-like mAbs did not react with mouse BMZ, we compared immunofluorescence reactivity between wild-type and COL7-rescued humanized mice and found that COL7-like mAbs reacted with BMZ of COL7-rescued humanized mice...
January 23, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28111811/overexpression-of-aqp3-and-aqp10-in-the-skin-exacerbates-psoriasiform-acanthosis
#17
David C Soler, Andrew E Young, Alexis D Griffith, Ping Fu, Kevin D Cooper, Thomas S McCormick, Daniel L Popkin
We previously observed that aquaporin-3 and aquaporin-10 are upregulated in the epidermis of hand dermatitis patients [1]. To address the functional relevance of this upregulation, we overexpressed AQP3/AQP10 in mice using the human K1 promoter. Combining imiquimod with detergent-containing water challenge, a common trigger in hand and other dermatidities, resulted in an increase in acanthosis in mice overexpressing AQP3 or AQP3 and AQP10. Aquaporin overexpression also drove a trend towards greater weight loss in these animals...
January 23, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28109199/functional-magnetic-resonance-imaging-in-dermatology-the-skin-the-brain-and-the-invisible
#18
REVIEW
Simon M Mueller, Samuel Hogg, Jannis Mueller, Shane McKie, Peter Itin, Julia Reinhardt, Christopher E M Griffiths, C Elise Kleyn
The skin and brain have a close bi-directional anatomical and functional connection. Historically, the skin-brain axis and the brain-skin axis have been well described. However, brain function in this context has only recently been demystified with the introduction of functional neuroimaging in dermatology. Functional neuroimaging, especially functional magnetic resonance imaging (fMRI), allows indirect visualisation of brain function. This review looks back to the beginnings of functional neuroimaging in dermatology, summarises the currently available dermatology-related fMRI-studies and discusses the potential future role of fMRI as a stratifying tool in clinical dermatology and in the development of novel therapies...
January 21, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28109175/langerhans-cell-markers-cd1a-and-cd207-are-the-most-rapidly-responding-genes-in-lesional-psoriatic-skin-following-adalimumab-treatment
#19
L Raaby, C Rosada, A Langkilde, K L Lauridsen, H Vinter, P Ommen, R B Kjellerup, C Johansen, L Iversen
TNFα-, IL-23- and IL-17-targeting drugs are highly effective in the treatment of psoriasis. However, the precise molecular mechanism remains unknown. In psoriatic skin the presence of Langerhans cells (LC) is reduced, but the role of LC is poorly understood. The purpose of this study was to investigate the impact of TNFα and IL-23/IL-17 on the presence of LC in the skin during treatment. Therefore, psoriatic skin was investigated before and after 4 days of adalimumab or ustekinumab treatment. Furthermore, TNFα and IL-17A stimulation was investigated in an ex vivo model of epidermis and dermis from healthy normal skin kept in cultures at an air-liquid interphase for 4 days...
January 21, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28109171/cd4-tcr%C3%AE-%C3%AE-foxp3-cells-an-unidentified-population-of-immunosuppressive-cells-towards-disease-progression-leprosy-patients
#20
LETTER
Mohd Tarique, Raza Ali Naqvi, Riyasat Ali, Neena Khanna, D N Rao
No abstract text is available yet for this article.
January 21, 2017: Experimental Dermatology
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