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Keratinocyte activation

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https://www.readbyqxmd.com/read/28532019/characterization-of-bladder-acellular-matrix-hydrogel-with-inherent-bioactive-factors
#1
Dan Jiang, Jianwen Huang, Huili Shao, Xuechao Hu, Lujie Song, Yaopeng Zhang
Bladder acellular matrix (BAM) hydrogel may have great potential in tissue engineering due to outstanding biocompatibility and the presence of inherent bioactive factors in BAM. In this study, we prepared the BAM hydrogel by the method of enzymatic solubilization with pepsin and characterize the microrheological properties of the BAM precursor solution. The structures of the BAM hydrogel were characterized by scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28523003/hpv16-e7-specific-activated-cd8-t-cells-in-e7-transgenic-skin-and-skin-grafts
#2
Seyed Davoud Jazayeri, Paula T Kuo, Graham Robert Leggatt, Ian H Frazer
Human papillomavirus (HPV) 16 E7 (E7) protein expression in skin promotes epithelial hyperproliferation and transformation to malignancy. Grafts of murine skin expressing E7 protein as a transgene in keratinocytes are not rejected from immunocompetent recipients, whereas grafts expressing ovalbumin (OVA), with or without coexpression of E7 protein, are promptly rejected, demonstrating that E7-associated non-antigen-specific local immunosuppression is not a major determinant of lack of rejection of E7 transgenic skin...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28521469/licochalcone-e-induces-caspase-dependent-death-of-human-pharyngeal-squamous-carcinoma-cells-through-the-extrinsic-and-intrinsic-apoptotic-signaling-pathways
#3
Sang-Joun Yu, In-A Cho, Kyeong-Rok Kang, Yi-Ra Jung, Seung Sik Cho, Goo Yoon, Ji-Su Oh, Jae-Seek You, Yo-Seob Seo, Gyeong-Je Lee, Sook-Young Lee, Do Kyung Kim, Chun Sung Kim, Su-Gwan Kim, Mi-Ae Jeong, Jae-Sung Kim
The aim of the present study was to investigate licochalcone-E (Lico-E)-induced apoptosis and the associated apoptotic signaling pathway in FaDu cells, a human pharyngeal squamous carcinoma cell line. Treatment with Lico-E exhibited significant cytotoxicity on FaDu cells in a concentration-dependent manner. The IC50 value of Lico-E in FaDu cells was ~50 µM. Treatment with Lico-E increased the number of dead FaDu cells. Furthermore, chromatin condensation, which is associated with apoptotic cell death, was observed in FaDu cells treated with Lico-E for 24 h...
May 2017: Oncology Letters
https://www.readbyqxmd.com/read/28516569/stat4-expression-and-activation-is-increased-during-mitosis-in-vitro-and-in-vivo-in-skin-and-mucosa-derived-cell-types-implications-in-neoplastic-and-inflammatory-skin-diseases
#4
Caterina Ferreli, Chester Lai, Suzannah August, Yvonne Buggy, Pawan Kumar, Nicola Brownlow, Peter Parker, Peter S Friedmann, Michael Ardern-Jones, Chris Pickard, Eugene Healy
BACKGROUND: The signal transducer and activator of transcription-4 (STAT4/Stat4) is a transcription factor known to convey signals from interleukin-12, interleukin-23, and interferon-alpha/beta to the nucleus, resulting in activation of dendritic cells, T-helper cell differentiation and production of interferon-gamma. OBJECTIVE: To demonstrate a novel role for STAT4 in cell mitosis. RESULTS: Phosphoserine STAT4 (pSerSTAT4) is increased in cells undergoing mitosis, and is distributed throughout the cytoplasm during this stage of the cell cycle whilst phosphotyrosine STAT4 (pTyrSTAT4) is confined to the chromosomal compartment...
May 18, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28515158/the-anti-psoriatic-drug-monomethylfumarate-increases-nuclear-factor-erythroid-2-related-factor-2-nrf2-levels-and-induces-aquaporin-3-aqp3-mrna-and-protein-expression
#5
Inas Helwa, Vivek Choudhary, Xunsheng Chen, Ismail Kaddour-Djebbar, Wendy B Bollag
BACKGROUND: Oxidative stress contributes to inflammatory skin diseases including psoriasis. Monomethylfumarate (MMF) is an anti-psoriatic agent with a poorly understood mechanism of action. In other cell types MMF increases the expression of nuclear factor erythroid-derived 2-like 2 (Nrf2), a transcription factor that regulates cellular anti-oxidant responses, to reduce oxidative stress like that observed in inflammatory disorders such as multiple sclerosis. OBJECTIVE: We tested the hypothesis that MMF enhances Nrf2 activity in keratinocytes, thereby improving their capacity to counteract environmental stresses...
May 17, 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/28511663/basic-fibroblast-growth-factor-reduces-scar-by-inhibiting-the-differentiation-of-epidermal-stem-cells-to-myofibroblasts-via-the-notch1-jagged1-pathway
#6
Peng Wang, Bin Shu, Yingbin Xu, Jiayuan Zhu, Jian Liu, Ziheng Zhou, Lei Chen, Jingling Zhao, Xusheng Liu, Shaohai Qi, Kun Xiong, Julin Xie
BACKGROUND: Basic fibroblast growth factor (bFGF) plays an important role in promoting wound healing and reducing scar, but the possible molecular mechanisms are still unclear. Our previous studies have found that activating the Notch1/Jagged1 pathway can inhibit the differentiation of epidermal stem cells (ESCs) to myofibroblasts (MFB). Herein, we document that bFGF reduces scar by inhibiting the differentiation of ESCs to MFB via activating the Notch1/Jagged1 pathway. METHODS: In in-vitro study, ESCs were isolated from 10 neonatal SD rats (1-3 days old), cultured in keratinocyte serum-free medium, and divided into six groups: bFGF group, bFGF + SU5402 group, bFGF + DAPT group, siJagged1 group, bFGF + siJagged1 group, and control group...
May 16, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28508168/distinct-histone-modifications-modulate-defb1-expression-in-human-vaginal-keratinocytes-in-response-to-lactobacillus-spp
#7
Jaehyouk Lee, Ara Jang, Jin Wook Kim, Jun Hyun Han, Byung Hee Chun, Hye Su Jung, Che Ok Jeon, Soon Chul Myung
Vaginal commensal lactobacilli are considered to contribute significantly to the control of vaginal microbiota by competing with other microflora for adherence to the vaginal epithelium and by producing antimicrobial compounds. However, the molecular mechanisms of symbiotic prokaryotic-eukaryotic communication in the vaginal ecosystem remain poorly understood. Here, we showed that both DNA methylation and histone modifications were associated with expression of the DEFB1 gene, which encodes the antimicrobial peptide human β-defensin-1, in vaginal keratinocyte VK2/E6E7 cells...
May 15, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28506683/the-caspase-1-inhibitor-card18-is-specifically-expressed-during-late-differentiation-of-keratinocytes-and-its-expression-is-lost-in-lichen-planus
#8
Haihong Qin, Jiang Jin, Heinz Fischer, Michael Mildner, Maria Gschwandtner, Veronika Mlitz, Leopold Eckhart, Erwin Tschachler
BACKGROUND: CARD18 contains a caspase recruitment domain (CARD) via which it binds to caspase-1 and thereby inhibits caspase-1-mediated activation of the pro-inflammatory cytokine interleukin (IL)-1β. OBJECTIVES: To determine the expression profile and the role of CARD18 during differentiation of keratinocytes and to compare the expression of CARD18 in normal skin and in inflammatory skin diseases. METHODS: Human keratinocytes were induced to differentiate in monolayer and in 3D skin equivalent cultures...
May 1, 2017: Journal of Dermatological Science
https://www.readbyqxmd.com/read/28505376/evolutionary-re-wiring-of-p63-and-the-epigenomic-regulatory-landscape-in-keratinocytes-and-its-potential-implications-on-species-specific-gene-expression-and-phenotypes
#9
Isha Sethi, Christian Gluck, Huiqing Zhou, Michael J Buck, Satrajit Sinha
Although epidermal keratinocyte development and differentiation proceeds in similar fashion between humans and mice, evolutionary pressures have also wrought significant species-specific physiological differences. These differences between species could arise in part, by the rewiring of regulatory network due to changes in the global targets of lineage-specific transcriptional master regulators such as p63. Here we have performed a systematic and comparative analysis of the p63 target gene network within the integrated framework of the transcriptomic and epigenomic landscape of mouse and human keratinocytes...
May 13, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28501563/kindlin-1-protects-cells-from-oxidative-damage-through-activation-of-erk-signalling
#10
Hila Emmert, Hitesh Patel, Valerie G Brunton
Kindlin-1 is a FERM domain containing adaptor protein that is found predominantly at cell-extracellular matrix adhesions where it binds to β-integrin subunits and is required for integrin activation. Loss of function mutations in the FERMT1 gene which encodes Kindlin-1 leads to the development of Kindler Syndrome (KS) an autosomal recessive skin disorder characterized by skin blistering, photosensitivity, and predisposition to aggressive squamous cell carcinoma (SCC). Here we show that loss of Kindlin-1 sensitizes both SCC cells and keratinocytes to oxidative stress: Kindlin-1 deficient cells have higher levels of reactive oxygen species, decreased viability and increased DNA damage after treatment with either hydrogen peroxide (H2O2) or irradiation with UVA...
May 10, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28499235/probiotics-a-non-conventional-therapy-for-oral-lichen-planus
#11
REVIEW
Xiao Han, Jing Zhang, Yaqin Tan, Gang Zhou
Oral lichen planus (OLP) is a common T-cell mediated chronic inflammatory disease. Although the etiology is still unclear, present studies suggest that the composition of the oral microbiota and psychological problems are implicated in the etiology of OLP. The pathogenesis of OLP includes mainly antigen-specific and non-specific mechanisms. Antigen-specific mechanisms involve T-cell activation following antigen presentation and apoptosis of basal keratinocytes triggered by CD8(+) cytotoxic T cells, while non-specific mechanisms consist of matrix metalloproteinase over-expression and mast cell degranulation in OLP lesions...
April 26, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28498430/uva-induced-upregulation-of-progerin-suppresses-53bp1%C3%A2-mediated-nhej-dsb-repair-in-human-keratinocytes-via-progerin-lamin%C3%A2-a-complex-formation
#12
Xin Huang, Yun Pan, Di Cao, Sheng Fang, Kun Huang, Jin Chen, Aijun Chen
Ultraviolet (UV) radiation is the primary risk factor underlying photoaging and photocarcinogenesis. Mounting research has focused on the role of DNA damage response pathways in UV-induced double-strand break (DSB) repair. In the present study, we hypothesized that UVA-induced aberrant progerin upregulation may adversely affect p53-binding protein 1 (53BP1)-mediated non-homologous end joining (NHE) DSB repair in human keratinocytes. Basal cell carcinoma (BCC) tumors and matching normal skin tissue were sampled (n=200) to investigate whether human keratinocytes display dysregulated progerin expression as a function of advancing age and BCC status...
April 26, 2017: Oncology Reports
https://www.readbyqxmd.com/read/28497658/toxic-epidermal-necrolysis-in-a-child-6-months-post-hematopoietic-stem-cell-transplantation
#13
Utako Oba, Hiroshi Yamada, So-Ichi Suenobu, Yusuke Nakamura, Akiko Ito, Yutaka Hatano, Nobuyoshi Itonaga, Kouichi Ohshima, Yuhki Koga, Shouichi Ohga, Kenji Ihara
TEN is a rare and critical disease mostly caused by drugs. It is mediated by activated CD8+ T cells that cause keratinocyte apoptosis with the assistance of cytokines/chemokines. We herein report a pediatric case of TEN after allogeneic HSCT with precursor B-cell acute lymphoblastic leukemia (pre-B-ALL) in second complete remission. Although we did not evaluate the T-cell subpopulation in blood or skin lesion of the patient, an imbalanced immune reconstitution after HSCT might additively contribute to the development of TEN...
May 12, 2017: Pediatric Transplantation
https://www.readbyqxmd.com/read/28497579/modulation-of-basal-cell-fate-during-productive-and-transforming-hpv16-infection-is-mediated-by-progressive-e6-driven-depletion-of-notch
#14
Christian Kranjec, Christina Holleywood, Diane Libert, Heather Griffin, Radma Mahmood, Erin Isaacson, John Doorbar
In stratified epithelia such as the epidermis, homeostasis is maintained by the proliferation of cells in the lower epithelial layers, and the concomitant loss of differentiated cells from the epithelial surface. These differentiating keratinocytes progressively stratify, and form a self-regenerating multi-layered barrier that protects the underlying dermis. In such tissue, the continual loss and replacement of differentiated cells also limits the accumulation of oncogenic mutations within the tissue. Inactivating mutations in key driver genes, such as TP53 and NOTCH1, reduce the proportion of differentiating cells allowing for the long-term persistence of expanding mutant clones in the tissue...
May 12, 2017: Journal of Pathology
https://www.readbyqxmd.com/read/28497028/inactive-gingipains-from-p-gingivalis-selectively-skews-t-cells-toward-a-th17-phenotype-in-an-il-6-dependent-manner
#15
Izabela Glowczyk, Alicia Wong, Barbara Potempa, Olena Babyak, Maciej Lech, Richard J Lamont, Jan Potempa, Joanna Koziel
Gingipain cysteine proteases are considered key virulence factors of Porphyromonas gingivalis. They significantly influence antibacterial and homeostatic functions of macrophages, neutrophils, the complement system, and cytokine networks. Recent data indicate the role of P. gingivalis in T cell differentiation; however, the involvement of gingipains in this process remains elusive. Therefore, the aim of this study was to investigate the contribution of danger signals triggered by the gingipains on the generation of Th17 cells, which play a key role in protection against bacterial diseases but may cause chronic inflammation and bone resorption...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28496325/multifunctional-and-biomimetic-fish-collagen-bioactive-glass-nanofibers-fabrication-antibacterial-activity-and-inducing-skin-regeneration-in-vitro-and-in-vivo
#16
Tian Zhou, Baiyan Sui, Xiumei Mo, Jiao Sun
The development of skin wound dressings with excellent properties has always been an important challenge in the field of biomedicine. In this study, biomimetic electrospun fish collagen/bioactive glass (Col/BG) nanofibers were prepared. Their structure, tensile strength, antibacterial activity and biological effects on human keratinocytes, human dermal fibroblasts and human vascular endothelial cells were investigated. Furthermore, the Sprague Dawley rat skin defect model was used to validate their effect on wound healing...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28495448/nrf2-in-keratinocytes-modulates-uvb-induced-dna-damage-and-apoptosis-in-melanocytes-through-mapk-signaling
#17
Saowanee Jeayeng, Adisak Wongkajornsilp, Andrzej T Slominski, Siwanon Jirawatnotai, Somponnat Sampattavanich, Uraiwan Panich
Responses of melanocytes (MC) to ultraviolet (UV) irradiation can be influenced by their neighbouring keratinocytes (KC). We investigated the role of Nrf2 in regulating paracrine effects of KC on UVB-induced MC responses through phosphorylation of MAPKs in association with oxidative stress in primary human MC cocultured with primary human KC using a transwell co-culture system and small-interfering RNA-mediated silencing of Nrf2 (siNrf2). The mechanisms by which Nrf2 modulated paracrine factors including α-melanocyte-stimulating hormone (α-MSH) and paracrine effects of KC on UVB-mediated apoptosis were also assessed...
May 8, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28494100/paracrine-regulation-of-melanogenesis
#18
REVIEW
X H Yuan, Z H Jin
Melanocytes are generally characterized by the basic ability of melanin synthesis and transfer to adjacent keratinocytes to constitute individual skin phenotype and provide epidermal protection from various stimuli, such as ultraviolet (UV) irradiation, through a complex process called melanogenesis, which can be regulated by autocrine or paracrine factors. Recent evidences have revealed the paracrine effects of keratinocytes on melanogenesis by secreting cytokines, including alpha-melanocyte stimulating hormone (α-MSH) and endothelin-1...
May 11, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/28489194/antiproliferative-activity-in-tumor-cell-lines-antioxidant-capacity-and-total-phenolic-flavonoid-and-tannin-contents-of-myrciaria-floribunda
#19
Luis A C Tietbohl, Adriana P Oliveira, Ricardo S Esteves, Ricardo D D G Albuquerque, Diogo Folly, Francisco P Machado, Arthur L Corrêa, Marcelo G Santos, Ana L G Ruiz, Leandro Rocha
Myrciaria floribunda (H. West ex Willd.) O. Berg, Myrtaceae, is a native plant species of the Atlantic Rain Forest, from north to south of Brazil. The lyophilized ethyl acetate extract from the leaves of M. floribunda was investigated for its antiproliferative activity in tumor cell lines, antioxidant capacity and its total phenolic, flavonoid and tannin contents. Antiproliferative activity was tested in vitro against seven human cancer cells and against immortalized human skin keratinocytes line (HaCat, no cancer cell)...
May 2, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28486908/synthesis-of-hybrids-of-dihydropyrimidine-and-pyridazinone-as-potential-anti-breast-cancer-agents
#20
Wasim Akhtar, Garima Verma, Mohemmed Faraz Khan, Mohammad Shaquiquzzaman, Arpana Rana, Tarique Anwer, Mymoona Akhter, M Mumtaz Alam
A series of dihydropyrimidine and pyridazinone hybrids (5a-u) was synthesized by cyclo-condensation of appropriate 3-aroylpropionic acid and dihydropyrimidine-hydrazine derivatives with the objective to develop agents with improved COX-2 inhibition for the treatment of breast cancer. The synthesized compounds were evaluated for their in-vitro anticancer activities against human breast cell lines (MCF-7, MDA-MB-231) and normal human keratinocytes (HaCaT). Amongst the compounds tested, compound 5l was found to be active against both the cell lines with IC50 value of 3...
February 20, 2017: Mini Reviews in Medicinal Chemistry
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