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Keratinocyte activation

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https://www.readbyqxmd.com/read/28432900/lysophosphatidic-acid-induces-expression-of-genes-in-human-oral-keratinocytes-involved-in-wound-healing
#1
Hong Huynh Thorlakson, Stian Andre Engen, Olav Schreurs, Karl Schenck, Inger Johanne Schytte Blix
OBJECTIVE: Epithelial cells participate in wound healing by covering wounds, but also as important mediators of wound healing processes. Topical application of the phospholipid growth factor lysophosphatidic acid (LPA) accelerates dermal wound healing and we hypothesized that LPA can play a role in human oral wound healing through its effects on human oral keratinocytes (HOK). DESIGN: HOK were isolated from gingival biopsies and exposed to LPA. The LPA receptor profile, signal transduction pathways, gene expression and secretion of selected cytokines were analyzed...
April 13, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28432555/rotundarpene-inhibits-tnf-%C3%AE-induced-activation-of-the-akt-mtor-and-nf-%C3%AE%C2%BAb-pathways-and-the-jnk-and-p38-associated-with-production-of-reactive-oxygen-species
#2
Arum Kim, Yoon Jeong Nam, Yong Kyoo Shin, Min Sung Lee, Dong Suep Sohn, Chung Soo Lee
Ilex Rotunda Thunb has been shown to have anti-inflammatory and antioxidant effects. In human keratinocytes, we investigated the effect of rotundarpene (4-caffeoyl-3-methyl-but-2-ene-1,4-diol) on the TNF-α-stimulated production of inflammatory mediators in relation to the Akt, mTOR, and NF-κB pathways, and the JNK and p38-MAPK. Rotundarpene, Akt inhibitor, Bay 11-7085, rapamycin, and N-acetylcysteine inhibited the TNF-α-stimulated production of cytokines and chemokines, increase in the levels of p-Akt and mTOR, activation of NF-κB, and production of reactive oxygen species in keratinocytes...
April 21, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28430185/phospholipase-c%C3%AE-1-regulates-p38-mapk-activity-and-skin-barrier-integrity
#3
Kaori Kanemaru, Yoshikazu Nakamura, Kengo Totoki, Takatsugu Fukuyama, Madoka Shoji, Hisae Kaneko, Kanako Shiratori, Atsuko Yoneda, Takafumi Inoue, Yoichiro Iwakura, Kenji Kabashima, Kiyoko Fukami
Keratinocytes undergo a unique type of programmed cell death known as cornification, which leads to the formation of the stratum corneum (SC), the main physical barrier of the epidermis. A defective epidermal barrier is a hallmark of the two most common inflammatory skin disorders, psoriasis, and atopic dermatitis. However, the detailed molecular mechanisms of skin barrier formation are not yet fully understood. Here, we showed that downregulation of phospholipase C (PLC) δ1, a Ca(2+)-mobilizing and phosphoinositide-metabolizing enzyme abundantly expressed in the epidermis, impairs the barrier functions of the SC...
April 21, 2017: Cell Death and Differentiation
https://www.readbyqxmd.com/read/28429105/increased-expression-of-upa-upar-and-pai-1-in-psoriatic-skin-and-in-basal-cell-carcinomas
#4
K A Rubina, V Yu Sysoeva, E I Zagorujko, Z I Tsokolaeva, M I Kurdina, Ye V Parfyonova, V A Tkachuk
There is substantial evidence implicating the urokinase system in tissue remodeling during neo-vascularization, inflammation, tumor invasion, and metastasis. Regulated degradation of the extracellular matrix at the leading edge of migrating cells, mediated by uPA and uPAR, is required for tissue remodeling, invasiveness, and angiogenesis. Psoriasis and basal cell carcinoma (BCC) are the most common skin diseases. Pathogenesis of both of them is associated with keratinocyte hyperproliferation, inflammatory cell migration, and angiogenesis-processes in which the plasminogen system (uPA, uPAR, tPA, and PAI-1) plays a crucial role...
April 20, 2017: Archives of Dermatological Research
https://www.readbyqxmd.com/read/28428003/rac1-signaling-regulates-cigarette-smoke-induced-inflammation-in-the-lung-via-the-erk1-2-mapk-and-stat3-pathways
#5
Jun-Xia Jiang, Shui-Juan Zhang, Hui-Juan Shen, Yan Guan, Qi Liu, Wei Zhao, Yong-Liang Jia, Jian Shen, Xiao-Feng Yan, Qiang-Min Xie
Cigarette smoke (CS) is a major risk factor for the development of chronic obstructive pulmonary disease (COPD). Our previous studies have indicated that Rac1 is involved in lipopolysaccharide-induced pulmonary injury and CS-mediated epithelial-mesenchymal transition. However, the contribution of Rac1 activity to CS-induced lung inflammation remains not fully clear. In this study, we investigated the regulation of Rac1 in CS-induced pulmonary inflammation. Mice or 16HBE cells were exposed to CS or cigarette smoke extract (CSE) to induce acute inflammation...
April 17, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28425217/the-release-of-pro-inflammatory-cytokines-is-mediated-via-map-kinases-rather-than-inflammasome-signaling-pathway-in-keratinocytes
#6
Thomas Ondet, Béatrice Muscatelli-Groux, Cédric Coulouarn, Sacha Robert, Thomas Gicquel, Aude Bodin, Vincent Lagente, Jean-Alexis Grimaud
Toll like receptors (TLRs) are expressed in the skin and airway epithelial tissues, which are the most important sites of host-pathogen interactions. TLRs recognize the three-dimensional structure of pathogen associated molecules and are thus useful markers of the innate immune response. Here, we investigated the role of lipopolysaccharides (LPS) and monosodium urate (MSU) crystals in the activation of the TLR and Nod Like Receptors (NLR) pathways in human keratinocytes. Analysis of the inflammasome compounds revealed that NLRP3 and TLR4, both of which are components of inflammasome complexes involved in the activation of IL-1β, were not expressed in keratinocytes...
April 20, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28422993/th17-micro-milieu-regulates-nlrp1-dependent-caspase-5-activity-in-skin-autoinflammation
#7
Stephanie Zwicker, Eva Hattinger, Daniela Bureik, Aleksandra Batycka-Baran, Andreas Schmidt, Peter-Arne Gerber, Simon Rothenfusser, Michel Gilliet, Thomas Ruzicka, Ronald Wolf
IL-1β is a potent player in cutaneous inflammation and central for the development of a Th17 micro-milieu in autoinflammatory diseases including psoriasis. Its production is controlled at the transcriptional level and by subsequent posttranslational processing via inflammatory caspases. In this study, we detected inflammatory caspase-5 active in epidermal keratinocytes and in psoriatic skin lesions. Further, interferon-γ and interleukin-17A synergistically induced caspase-5 expression in cultured keratinocytes, which was dependent on the antimicrobial peptide psoriasin (S100A7)...
2017: PloS One
https://www.readbyqxmd.com/read/28419554/the-major-mir-31-target-genes-stk40-and-lats2-and-their-implications-in-the-regulation-of-keratinocyte-growth-and-hair-differentiation
#8
Liming Luan, Jianyun Shi, Zhengquan Yu, Thomas Andl
Emerging evidence indicates that even subtle changes in the expression of key genes of signaling pathways can have profound effects. MicroRNAs (miRNAs) are masters of subtleness and generally have only mild effects on their target genes. The microRNA miR-31 is one of the major microRNAs in many cutaneous conditions associated with activated keratinocytes such as the hyperproliferative diseases psoriasis, non-melanoma skin cancer, and hair follicle growth. miR-31 is a marker of the hair growth phase, and in our miR-31 transgenic mouse model it impairs the function of keratinocytes, subsequently leading to aberrant proliferation, apoptosis and differentiation that result in altered hair growth, while loss of miR-31 leads to increased hair growth...
April 17, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28418601/to-arginine-residues-in-the-cooh-terminal-of-human-%C3%AE-defensin-3-constitute-an-essential-motif-for-antimicrobial-activity-and-il-6-production
#9
Yoko Sakagami-Yasui, Yoshinori Shirafuji, Osamu Yamasaki, Shin Morizane, Toshihisa Hamada, Hiroshi Umemura, Keiji Iwatsuki
Human β-defensin-3 (HBD-3) possesses antimicrobial activities and the potential to induce proinflammatory cytokines. HBD-3 contains a unique motif of two arginine residues (Arg. R) in the COOH-terminal region. To understand the bioactive properties of the Arg residues of HBD-3, we examined antimicrobial activities against S. aureus and P. aeruginosa using synthetic HBD-2, HBD-3, and two variant peptides of HBD-3: the Arg-truncated variant designated desR HBD-3, and NRR HBD-3, in which both Arg residues were shifted to the N-terminal region...
April 18, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28415789/hmga2-translocation-induced-in-skin-tumorigenesis
#10
Yong Li, Xiang-Ying Pi, Kelsey Boland, Sonali Lad, Kelly Johnson, Catherine Verfaillie, Rebecca J Morris
Hmga2 protein, a transcription factor involved in chromatin architecture, is expressed chiefly during development, where it has many key biological functions. When expressed in adult tissues from in various organs, Hmga2 is always related to cancer development. The role of Hmga2 in skin tumorigenesis is, however, not yet understood. We demonstrated that Hmga2 can be found in non-transformed epidermis, specifically located to the membrane of keratinocytes (KCs) in epidermis. Ex vivo culture of KCs and development of skin carcinomas in DMBA and TPA mouse models was associated with translocation of the Hmga2 protein from the membrane into the nucleus, where Hmga2 induced its own expression by binding to the Hmga2 promoter...
March 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28413317/korean-red-ginseng-improves-atopic-dermatitis-like-skin-lesions-by-suppressing-expression-of-proinflammatory-cytokines-and-chemokines-in%C3%A2-vivo-and-in%C3%A2-vitro
#11
Ji-Ye Kee, Yong-Deok Jeon, Dae-Seung Kim, Yo-Han Han, Jinbong Park, Dong-Hyun Youn, Su-Jin Kim, Kwang Seok Ahn, Jae-Young Um, Seung-Heon Hong
BACKGROUND: The prevalence of allergic inflammatory diseases such as atopic dermatitis (AD), asthma, and allergic rhinitis worldwide has increased and complete recovery is difficult. Korean Red Ginseng, which is the heat-processed root of Panax ginseng Meyer, is widely and frequently used as a traditional medicine in East Asia. In this study, we investigated whether Korean Red Ginseng water extract (RGE) regulates the expression of proinflammatory cytokines and chemokines via the mitogen-activated protein kinases (MAPKs)/nuclear factor kappa B (NF-κB) pathway in allergic inflammation...
April 2017: Journal of Ginseng Research
https://www.readbyqxmd.com/read/28413121/characterisation-of-cell-cycle-arrest-and-terminal-differentiation-in-a-maximally-proliferative-human-epithelial-tissue-lessons-from-the-human-hair-follicle-matrix
#12
Talveen S Purba, Lars Brunken, Michael Peake, Asim Shahmalak, Asuncion Chaves, Enrique Poblet, Ralf Paus
Human hair follicle (HF) growth and hair shaft formation require terminal differentiation-associated cell cycle arrest of highly proliferative matrix keratinocytes. However, the regulation of this complex event remains unknown. CIP/KIP family member proteins (p21(CIP1), p27(KIP1) and p57(KIP2)) regulate cell cycle progression/arrest, endoreplication, differentiation and apoptosis. Since they have not yet been adequately characterized in the human HF, we asked whether and where CIP/KIP proteins localise in the human hair matrix and pre-cortex in relation to cell cycle activity and HF-specific epithelial cell differentiation that is marked by keratin 85 (K85) protein expression...
April 2, 2017: European Journal of Cell Biology
https://www.readbyqxmd.com/read/28413063/amniotic-membrane-application-for-the-healing-of-chronic-wounds-and-ulcers
#13
Gregorio Castellanos, Ángel Bernabé-García, José M Moraleda, Francisco J Nicolás
Wound healing usually follows a predictable sequence and prognosis of events. Its evolutionary process is the result of a complicated interaction between patient-related factors, the wound, the treatment used and the skills and knowledge of the professionals who treat them. Only through a meticulous initial assessment of the wound is it possible to identify the factors that contribute to its complexity. The challenge for professionals will be to implement efficient therapies at the right time and in the most cost-efficient way in order to reduce associated problems, treat the symptoms and expectations of the patients and achieve adequate wound healing whenever possible...
April 10, 2017: Placenta
https://www.readbyqxmd.com/read/28412298/tight-junction-proteins-claudin-1-and-occludin-are-important-for-cutaneous-wound-healing
#14
Thomas Volksdorf, Janina Heilmann, Sabine A Eming, Kathrin Schawjinski, Michaela Zorn-Kruppa, Christopher Ueck, Sabine Vidal-Y-Sy, Sabine Windhorst, Manfred Jücker, Ingrid Moll, Johanna M Brandner
Tight junction (TJ) proteins are known to be involved in proliferation and differentiation. These processes are essential for normal skin wound healing. Here, we investigated the TJ proteins claudin-1 and occludin in ex vivo skin wound healing models and tissue samples of acute and chronic human wounds and observed major differences in localization/expression of these proteins, with chronic wounds often showing a loss of the proteins at the wound margins and/or in the regenerating epidermis. Knockdown experiments in primary human keratinocytes showed that decreased claudin-1 expression resulted in significantly impaired scratch wound healing, with delayed migration and reduced proliferation...
April 12, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28411880/in%C3%A2-vitro-induction-effect-of-1-25-oh-2d3-on-differentiation-of-hair-follicle-stem-cell-into-keratinocyte
#15
Sanaz Joulai Veijouyeh, Farhad Mashayekhi, Abazar Yari, Fatemeh Heidari, Nayereh Sajedi, Fatemeh Moghani Ghoroghi, Maliheh Nobakht
BACKGROUND: Stem cells are characterized by self-renewal and differentiation capabilities. The bulge hair follicle stem cells (HFSCs) are able to convert to epithelial components. The active metabolite of vitamin D, 1,25(OH)2D3, plays important roles in this differentiation process. In the present study has found that 1,25(OH)2D3 induces the HFSCs differentiation into keratinocyte. METHODS: HFSCs are isolated from rat whiskers and cultivated in DMEM medium. To isolate bulge stem cell population, flow cytometry and immunocytochemistry using K15, CD34 and nestin biomarkers were performed...
February 2017: Biomedical Journal
https://www.readbyqxmd.com/read/28411854/the-molecular-revolution-in-cutaneous-biology-chromosomal-territories-higher-order-chromatin-remodeling-and-the-control-of%C3%A2-gene-expression-in-keratinocytes
#16
REVIEW
Vladimir A Botchkarev
Three-dimensional organization of transcription in the nucleus and mechanisms controlling the global chromatin folding, including spatial interactions between the genes, noncoding genome elements, and epigenetic and transcription machinery, are essential for establishing lineage-specific gene expression programs during cell differentiation. Spatial chromatin interactions in the nucleus involving gene promoters and distal regulatory elements are currently considered major forces that drive cell differentiation and genome evolution in general, and such interactions are substantially reorganized during many pathological conditions...
May 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28410493/oxadiazole-substituted-naphtho-2-3-b-thiophene-4-9-diones-as-potent-inhibitors-of-keratinocyte-hyperproliferation-structure-activity-relationships-of-the-tricyclic-quinone-skeleton-and-the-oxadiazole-substituent
#17
Atila Basoglu, Simone Dirkmann, Nader Zahedi Golpayegani, Silke Vortherms, Jan Tentrop, Dominica Nowottnik, Helge Prinz, Roland Fröhlich, Klaus Müller
Novel analogues of oxadiazole-substituted naphtho[2,3-b]thiophene-4,9-diones were synthesized in which the tricyclic quinone skeleton was systematically replaced with simpler moieties, such as structures with fewer rings and open-chain forms, while the oxadiazole ring was maintained. In addition, variants of the original 1,2,4-oxadiazole ring were explored. Overall, the complete three-ring quinone was essential for potent suppression of human keratinocyte hyperproliferation, whereas analogous anthraquinones were inactive...
April 3, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28406748/radiation-induced-dermatitis-is-mediated-by-il17-expressing-%C3%AE-%C3%AE-t-cells
#18
Wupeng Liao, Tom K Hei, Simon K Cheng
Radiation dermatitis is a serious cutaneous injury caused by radiation therapy or upon accidental nuclear exposure. However, the pathogenic immune mechanisms underlying this injury are still poorly understood. We seek to discover how the dysregulated immune response after irradiation orchestrates skin inflammation. The skin on the left flank of C57BL/6J wild-type and C57BL/6J Tcrd(-/-) mice, which are deficit in γδ T cells, was exposed to a single X-ray dose of 25 Gy, and the right-flank skin was used as a sham-irradiated control...
April 2017: Radiation Research
https://www.readbyqxmd.com/read/28406163/actomyosin-contractility-provokes-contact-inhibition-in-e-cadherin-ligated-keratinocytes
#19
Hiroaki Hirata, Mikhail Samsonov, Masahiro Sokabe
Confluence-dependent inhibition of epithelial cell proliferation, termed contact inhibition, is crucial for epithelial homeostasis and organ size control. Here we report that among epithelial cells, keratinocytes, which compose the stratified epithelium in the skin, possess a unique, actomyosin-dependent mechanism for contact inhibition. We have observed that under actomyosin-inhibited conditions, cell-cell contact itself through E-cadherin promotes proliferation of keratinocytes. Actomyosin activity in confluent keratinocytes, however, inhibits nuclear localization of β-catenin and YAP, and causes attenuation of β-catenin- and YAP-driven cell proliferation...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28405264/blt2-expression-improves-skin-integrity-and-protects-from-alterations-caused-by-hyperglycemia-in-type-2-diabetes
#20
Alberto Leguina-Ruzzi, Juan P Valderas
Type 2 diabetes (T2D) can go undiagnosed for years, leading to a stage where chronic high blood sugar produces complications such as delayed wound healing. Reports have shown that BLT2 activation improves keratinocyte migration and wound healing, as well as protecting the epidermal barrier through the promotion of actin polymerization. The goal of this study was to elucidate the role of BLT2 expression in skin epithelial integrity in T2D. For this purpose, we used both wild type (WT) and BLT2 knockout mice in a model, in which a T2D-like phenotype was induced by keeping the animals on a high fat (HF) diet over 5 weeks...
2017: Dermato-endocrinology
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