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https://www.readbyqxmd.com/read/28322869/scaffold-free-high-throughput-generation-of-quiescent-valvular-microtissues
#1
Annelies Roosens, Inès Puype, Ria Cornelissen
AIMS: The major challenge of working with valvular interstitial cells in vitro is the preservation or recovery of their native quiescent state. In this study, a biomimetic approach is used which aims to engineer small volume, high quality valve microtissues, having a potential in regenerative medicine and as a relevant 3D in vitro model to provide insights into valve (patho)biology. METHODS AND RESULTS: To form micro-aggregates, porcine valvular interstitial cells were seeded in agarose micro-wells and cultured in medium supplemented with 250μM Ascorbic Acid 2-phosphate for 22days...
March 17, 2017: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/28321979/effect-of-the-early-social-environment-on-behavioural-and-genomic-responses-to-a-social-challenge-in-a-cooperatively-breeding-vertebrate
#2
Cecilia Nyman, Stefan Fischer, Nadia Aubin-Horth, Barbara Taborsky
The early social environment can have substantial, lifelong effects on vertebrate social behaviour, which can be mediated by developmental plasticity of brain gene expression. Early life effects can influence immediate behavioural responses towards later-life social challenges and can activate different gene expression responses. However, while genomic responses to social challenges have been reported frequently, how developmental experience influences the shape of these genomic reaction norms remains largely unexplored...
March 21, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28317936/priming-of-transcriptional-memory-responses-via-the-chromatin-accessibility-landscape-in-t-cells
#3
Wen Juan Tu, Kristine Hardy, Christopher R Sutton, Robert McCuaig, Jasmine Li, Jenny Dunn, Abel Tan, Vedran Brezar, Melanie Morris, Gareth Denyer, Sau Kuen Lee, Stephen J Turner, Nabila Seddiki, Corey Smith, Rajiv Khanna, Sudha Rao
Memory T cells exhibit transcriptional memory and "remember" their previous pathogenic encounter to increase transcription on re-infection. However, how this transcriptional priming response is regulated is unknown. Here we performed global FAIRE-seq profiling of chromatin accessibility in a human T cell transcriptional memory model. Primary activation induced persistent accessibility changes, and secondary activation induced secondary-specific opening of previously less accessible regions associated with enhanced expression of memory-responsive genes...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28296045/one-year-outcomes-after-successful-chronic-total-occlusion-percutaneous-coronary-intervention
#4
W M Wilson, S J Walsh, A Bagnall, A T Yan, C G Hanratty, M Egred, E Smith, K G Oldroyd, M McEntegart, J Irving, H Douglas, J Strange, J C Spratt
We aimed to determine clinical outcomes 1 year after successful chronic total occlusion (CTO) PCI and, in particular, whether use of dissection and re-entry strategies affects clinical outcomes. Hybrid approaches have increased the procedural success of CTO percutaneous coronary intervention (PCI) but longer-term outcomes are unknown, particularly in relation to dissection and re-entry techniques. Data were collected for consecutive CTO PCIs performed by hybrid-trained operators from 7 United Kingdom (UK) centres between 2012 and 2014...
March 15, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28286204/long-term-acetaminophen-treatment-induced-liver-fibrosis-in-mice-and-the-involvement-of-egr-1
#5
Qingyun Bai, Hongyu Yan, Yuchen Sheng, Yao Jin, Liang Shi, Lili Ji, Zhengtao Wang
Acetaminophen (APAP)-induced acute liver injury has already been well studied. However, whether long-term administration of APAP will cause liver fibrosis is still not very clear. This study aims to investigate the liver fibrosis in mice induced by long-term APAP treatment and the involvement of early growth response 1 (Egr-1). C57BL/6 mice were orally given with APAP (200, 300mg/kg) for 2, 6 or 10 weeks, respectively. Liver hydroxyproline content, collagen deposition and inflammatory cells infiltration were increased in mice treated with APAP (200, 300mg/kg) for 6 or 10 weeks...
March 9, 2017: Toxicology
https://www.readbyqxmd.com/read/28282643/nab2-maintains-thymus-cellularity-with-aging-and-stress
#6
K Taraszka Hastings, Diana Elizalde, Leela Muppana, Sarah Levine, Christy M Kamel, Wendy M Ingram, Jennifer T Kirkpatrick, Chengcheng Hu, Matthew P Rausch, Amelia L Gallitano
Thymic cellularity is influenced by a variety of biological and environmental factors, such as age and stress; however, little is known about the molecular genetic mechanisms that regulate this process. Immediate early genes of the Early growth response (Egr) family have critical roles in immune function and response to environmental stress. The transcription factors, Egr1, Egr2 and Egr3, play roles in the thymus and in peripheral T-cell activation. Nab2, which binds Egrs 1, 2, and 3 as a co-regulator of transcription, also regulates peripheral T-cell activation...
March 7, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28275114/binding-and-inhibition-of-the-ternary-complex-factor-elk-4-sap1-by-the-adapter-protein-dok-4
#7
Erika Hooker, Cindy Baldwin, Victoria Roodman, Anupam Batra, Tomoko Takano, Serge Lemay
The adapter protein Dok-4 has been reported as both activator and inhibitor of Erk and Elk-1, but lack of knowledge about the identity of its partner molecules has precluded any mechanistic insight into these seemingly conflicting properties. We report that Dok-4 interacts with the transactivation domain of Elk-4  through an atypical PTB domain-mediated interaction. Dok-4 possesses a nuclear export signal and can relocalize Elk-4 from nucleus to cytosol, whereas Elk-4 possesses two nuclear localization signals that restrict interaction with Dok-4...
March 8, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28269757/correlations-of-the-expressions-of-c-jun-and-egr-1-proteins-with-clinicopathological-features-and-prognosis-of-patients-with-nasopharyngeal-carcinoma
#8
Jia-Teng Zhong, Hai-Jun Wang, Jian Yu, Jing-Hang Zhang, Shi-Feng Wang, Xue Yang, Wei Su
This study intended to explore the correlation of the expressions of c-Jun and Egr-1 proteins with clinicopathological features and prognosis of patients with nasopharyngeal carcinoma (NPC). From January 2008 to January 2011, 123 NPC patients and 59 patients with chronic rhinitis were enrolled in this study. Fresh NPC and normal nasopharynx tissue specimens were obtained during surgery. Immunohistochemistry (IHC) was adopted to determine the positive expressions of the c-Jun and Egr-1 proteins. A 5-year clinical follow-up was conducted on all NPC patients...
February 27, 2017: Cancer Biomarkers: Section A of Disease Markers
https://www.readbyqxmd.com/read/28243112/induction-of-pd-l1-expression-by-epidermal-growth-factor-receptor-mediated-signaling-in-esophageal-squamous-cell-carcinoma
#9
Wencheng Zhang, Qingsong Pang, Cihui Yan, Qifeng Wang, Jingsong Yang, Shufei Yu, Xiao Liu, Zhiyong Yuan, Ping Wang, Zefen Xiao
PURPOSE: The purpose of this study was to investigate the potential effect of activation of epidermal growth factor receptor (EGFR) signaling pathway on the expression of programmed death-ligand 1 (PD-L1) in esophageal squamous cell carcinoma (ESCC) cells with EGFR overexpression. METHODS: Flow cytometry and Western blot methods were used to assess PD-L1 expression on ESCC cells when EGFR signaling pathway was activated by epidermal growth factor (EGF) with or without EGFR-specific inhibitor AG-1478, and then EGFR signaling array was applied to analyze the potential signaling pathways involved...
2017: OncoTargets and Therapy
https://www.readbyqxmd.com/read/28228068/stress-in-gastrointestinal-tract-and-stable-gastric-pentadecapeptide-bpc-157-finally-do-we-have-a-solution
#10
Predrag Sikiric, Sven Seiwerth, Rudolf Rucman, Domagoj Drmic, Mirjana Stupnisek, Antonio Kokot, Marko Sever, Ivan Zoricic, Zoran Zoricic, Lovorka Batelja, Tihomil Ziger, Josipa Vlainic, Zarko Rasic, Martina Lovric Bencic
Selye's syndrome produced by diverse nocuous agents and "response to damage as such" means Selye's stress triad in stress coping response to reestablish homeostasis. Logically, from the gastrointestinal tract viewpoint, such organoprotective/healing response implies the angiogenic growth factors that commonly signify the healing. Thereby, the gastric pentadecapeptide BPC 157-organoprotection (huge range of beneficial effects) signifies the Selye's stress concept/stress coping response implemented in and from gastrointestinal tract, and BPC 157 as an integrative mediator that integrates the adaptive bodily response to stress...
February 20, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28207303/growth-of-listeria-monocytogenes-in-thawed-frozen-foods
#11
Ai Kataoka, Hua Wang, Philip H Elliott, Richard C Whiting, Melinda M Hayman
The growth characteristics of Listeria monocytogenes inoculated onto frozen foods (corn, green peas, crabmeat, and shrimp) and thawed by being stored at 4, 8, 12, and 20°C were investigated. The growth parameters, lag-phase duration (LPD) and exponential growth rate (EGR), were determined by using a two-phase linear growth model as a primary model and a square root model for EGR and a quadratic model for LPD as secondary models, based on the growth data. The EGR model predictions were compared with growth rates obtained from the USDA Pathogen Modeling Program, calculated with similar pH, salt percentage, and NaNO2 parameters, at all storage temperatures...
February 16, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28202416/microarray-analysis-of-macrophage-response-to-infection-with-streptococcus-oralis-reveals-the-immunosuppressive-effect-of-hydrogen-peroxide
#12
Hitomi Matsushima, Yutaro Kumagai, Alexis Vandenbon, Hideo Kataoka, Miki Kadena, Haruka Fukamachi, Takafumi Arimoto, Hirobumi Morisaki, Nagatoshi Fujiwara, Nobuo Okahashi, Hirotaka Kuwata
Oral streptococci including mitis group streptococci are commensal residents and are also the first to colonize the oral cavity. However, various species of these oral streptococci have the potential to invade the host and occasionally lead to severe infectious disease such as cardiovascular diseases. Oral streptococci have close interactions with the host immune system including macrophages at the oral mucosal surface. One notable common trait of oral streptococcus including Streptococcus oralis (S. oralis) is the production of hydrogen peroxide (H2O2)...
April 1, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28187447/egr-1-and-rna-pol-ii-facilitate-glioma-cell-gdnf-transcription-induced-by-histone-hyperacetylation-in-promoter-ii
#13
Bao-Le Zhang, Ting-Wen Guo, Le-Le Gao, Guang-Quan Ji, Xiao-He Gu, Yu-Qi Shao, Rui-Qin Yao, Dian-Shuai Gao
The specific mechanisms for epigenetic regulation of gene transcription remain to be elucidated. We previously demonstrated that hyperacetylation of histone H3K9 in promoter II of glioma cells promotes high transcription of the glial cell line-derived neurotrophic factor (GDNF) gene. This hyperacetylation significantly enhanced Egr-1 binding and increased the recruitment of RNA polymerase II (RNA POL II) to that region (P < 0.05). Egr-1 expression was abnormally increased in C6 glioma cells. Further overexpression of Egr-1 significantly increased Egr-1 binding to GDNF promoter II, while increasing RNA POL II recruitment, thus increasing GDNF transcription (P < 0...
February 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/28134935/egr-1-regulates-irradiation-induced-autophagy-through-atg4b-to-promote-radioresistance-in-hepatocellular-carcinoma-cells
#14
W-X Peng, Y-Y Wan, A-H Gong, L Ge, J Jin, M Xu, C-Y Wu
Although hepatocellular carcinoma (HCC) is usually response to radiation therapy, radioresistance is still the major obstacle that limits the efficacy of radiotherapy for HCC patients. Therefore, further investigation of underlying mechanisms in radioresistant HCC cells is warranted. In this study, we determined the effect of early growth response factor (Egr-1) on irradiation-induced autophagy and radioresistance in HCC cell lines SMMC-7721 and HepG2. We showed that autophagy-related gene 4B (Atg4B) is induced by Egr-1 upon ionizing radiation (IR) in HCC cells...
January 30, 2017: Oncogenesis
https://www.readbyqxmd.com/read/28130449/il-27-alleviates-bone-loss-in-estrogen-deficient-conditions-by-induction-of-early-growth-response-2-gene
#15
Priyanka Shukla, Mohd Nizam Mansoori, Manisha Kakaji, Manoj Shukla, Sushil Kumar Gupta, Divya Singh
Growing understanding of the bone remodeling process suggests that inflammation significantly contributes to the pathogenesis of osteoporosis. T cells and various cytokines contribute majorly to the estrogen deficiency induced bone loss. Recent studies have identified IL-12 cytokine family comprising of pro-inflammatory IL-12 and IL-23 and the anti-inflammatory IL-27 and IL-35 cytokines. IL-27 exerts protective effects in autoimmune diseases like experimental autoimmune encephalomyelitis however; its role in pathogenesis of osteoporosis remains to be determined...
January 27, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28125090/loss-of-gcn5-leads-to-increased-neuronal-apoptosis-by-upregulating-e2f1-and-egr-1-dependent-bh3-only-protein-bim
#16
Yanna Wu, Shanshan Ma, Yong Xia, Yangpeng Lu, Shiyin Xiao, Yali Cao, Sidian Zhuang, Xiangpeng Tan, Qiang Fu, Longchang Xie, Zhiming Li, Zhongmin Yuan
Cellular acetylation homeostasis is a kinetic balance precisely controlled by histone acetyl-transferase (HAT) and histone deacetylase (HDAC) activities. The loss of the counterbalancing function of basal HAT activity alters the precious HAT:HDAC balance towards enhanced histone deacetylation, resulting in a loss of acetylation homeostasis, which is closely associated with neuronal apoptosis. However, the critical HAT member whose activity loss contributes to neuronal apoptosis remains to be identified. In this study, we found that inactivation of GCN5 by either pharmacological inhibitors, such as CPTH2 and MB-3, or by inactivation with siRNAs leads to a typical apoptosis in cultured cerebellar granule neurons...
January 26, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28118985/mechanisms-of-modulation-of-the-egr-gene-family-in-mammary-epithelial-cells-of-different-species
#17
P Santino, E Martignani, S Miretti, M Baratta, P Accornero
In the adult female, within the estrous cycle, the mammary gland undergoes multiple rounds of growth, with increased cellular proliferation, and involution, with increased apoptosis. The increase in proliferation is elicited by endocrine (Estrogen, Progesterone), as well as locally produced (Epidermal growth factor, Insulin-like growth factor, etc) growth factors. Among the genes that are modulated during cellular proliferation, immediate early genes play a fundamental role, being rapidly upregulated and then downregulated within the G0/G1 phase of the cell cycle, allowing the progression to the subsequent phases...
January 21, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28116426/-effects-and-mechanisms-of-egr-1-on-inflammatory-responses-induced-by-mechanical-stress-in-human-periodontal-ligament-cells
#18
Hai-Yan Hu, Zhi-Biao Gao
PURPOSE: To investigate the effects and mechanisms of silencing Egr-1 on MS-mediated secretion and expression of inflammatory cytokines in hPDLs. METHODS: The secretion and expression of IL-1β, IL-6, IL-8 and IL-11 were detected using ELISA and RT-PCR when cells were cultured with or without various duration (6, 12, 24 and 48 h) and force (3%, 6%, 12%, 15%) of mechanica stress (MS). RT-PCR and Western blotting were used to evaluate the expression of Egr-1 under a 12% MS for 24 h...
October 2016: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28111052/activated-p300-acetyltransferase-activity-modulates-aortic-valvular-calcification-with-osteogenic-transdifferentiation-and-downregulation-of-klotho
#19
Shao-Jung Li, Yu-Hsun Kao, Cheng-Chih Chung, Wei-Yu Chen, Wan-Li Cheng, Yi-Jen Chen
BACKGROUND: The calcific aortic valve (AV) disease is a common disease with the unclear mechanism, and optimal pharmacological treatment remains unavailable. Epigenetic modulation by histone acetyltransferase (HAT) plays a critical role in osteogenic transdifferentiation and atherosclerosis. The purposes of this study were to investigate whether HAT contributes to the pathophysiology of AV calcification and assess the therapeutic potential of HAT inhibition. METHODS: Porcine valvular interstitial cells (VICs) were treated with osteogenic medium (10ng/mL of tumor necrosis factor-α and 4mmol/L of high phosphate) for 7days...
January 5, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28105751/stim-1-and-orai-1-channel-mediate-angiotensin-ii-induced-expression-of-egr-1-in-vascular-smooth-muscle-cells
#20
Estelle R Simo-Cheyou, Ju Jing Tan, Ryszard Grygorczyk, Ashok K Srivastava
An upregulation of Egr-1 expression has been reported in models of atherosclerosis and intimal hyperplasia and, various vasoactive peptides and growth promoting stimuli have been shown to induce the expression of Egr-1 in vascular smooth muscle cells (VSMC). Angiotensin-II (Ang-II) is a key vasoactive peptide that has been implicated in the pathogenesis of vascular diseases. Ang-II elevates intracellular Ca(2+) through activation of the store-operated calcium entry (SOCE) involving an inositol-3-phosphate receptor (IP3R)-coupled depletion of endoplasmic reticular Ca(2+) and a subsequent activation of the stromal interaction molecule 1 (STIM-1)/Orai-1 complex...
January 20, 2017: Journal of Cellular Physiology
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