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Extracellular DNA

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https://www.readbyqxmd.com/read/28728145/extracellular-dna-contributes-to-dental-biofilm-stability
#1
Sebastian Schlafer, Rikke L Meyer, Irene Dige, Viduthalai R Regina
Extracellular DNA (eDNA) is a major matrix component of many bacterial biofilms. While the presence of eDNA and its role in biofilm stability have been demonstrated for several laboratory biofilms of oral bacteria, there is no data available on the presence and function of eDNA in in vivo grown dental biofilms. This study aimed to determine whether eDNA was part of the matrix in biofilms grown in situ in the absence of sucrose and whether treatment with DNase dispersed biofilms grown for 2.5, 5, 7.5, 16.5, or 24 h...
July 21, 2017: Caries Research
https://www.readbyqxmd.com/read/28723472/human-prostate-tissue-derived-extracellular-matrix-as-a-model-of-prostate-microenvironment
#2
Walter Cazzaniga, Manuela Nebuloni, Erika Longhi, Irene Locatelli, Raffaele Allevi, Roberta Lucianò, Gelsomina Senatore, Eugenio Ventimiglia, Vito Cucchiara, Luca Genovese, Francesco Montorsi, Massimo Alfano, Andrea Salonia, Ilaria Cavarretta
BACKGROUND: Clinical experience highlights the wide heterogeneity of primary prostate cancer (PPCa), even when potentially related to the same grade and stage. Currently available prediction tools and biomarkers do not always allow for early recognition of PPCa aggressive phenotype, sometimes making it impossible to distinguish among men harbouring indolent tumours or life-threatening disease. OBJECTIVE: To establish a novel ex vivo/in vitro model suitable to estimate the invasive phenotype of PPCa cells (PPCaC)...
October 2016: European Urology Focus
https://www.readbyqxmd.com/read/28722429/detection-of-k-efflux-from-stimulated-cortical-neurons-by-an-aptamer-modified-silicon-nanowire-field-effect-transistor
#3
Ankur Anand, Chia-Rung Liu, Ai-Chuan Chou, Wan-Hsuan Hsu, Rajesh Kumar Ulaganathan, Yi-Cheng Lin, Chi-An Dai, Fan-Gang Tseng, Chien-Yuan Pan, Yit-Tsong Chen
The concentration gradient of K(+) across the cell membrane of a neuron determines its resting potential and cell excitability. During neurotransmission, the efflux of K(+) from the cell via various channels will not only decrease the intracellular K(+) content but also elevate the extracellular K(+) concentration. However, it is not clear to what extent this change could be. In this study, we developed a multiple-parallel-connected silicon nanowire field-effect transistor (SiNW-FET) modified with K(+)-specific DNA-aptamers (aptamer/SiNW-FET) for the real-time detection of the K(+) efflux from cultured cortical neurons...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28718419/targeting-pi3k-signaling-in-combination-cancer-therapy
#4
REVIEW
Elvire Pons-Tostivint, Benoît Thibault, Julie Guillermet-Guibert
Targeting upstream phosphatidylinositol-3-kinases (PI3Ks) in the PI3K/Akt/mTOR pathway appears to be a promising therapy in solid cancers; however, first early clinical trials with PI3K inhibitors in monotherapy have been disappointing. A massive array of preclinical and clinical trials are currently evaluating combinations of PI3K inhibitors in targeted therapies. These combinations include co-treatments with drugs directed against other intra-/extracellular signaling molecules, nuclear hormone receptors, DNA damage repair enzymes, and immune modulators...
June 2017: Trends in Cancer
https://www.readbyqxmd.com/read/28717873/orchestration-of-h3k27-methylation-mechanisms-and-therapeutic-implication
#5
REVIEW
Mei-Ren Pan, Ming-Chuan Hsu, Li-Tzong Chen, Wen-Chun Hung
Histone proteins constitute the core component of the nucleosome, the basic unit of chromatin. Chemical modifications of histone proteins affect their interaction with genomic DNA, the accessibility of recognized proteins, and the recruitment of enzymatic complexes to activate or diminish specific transcriptional programs to modulate cellular response to extracellular stimuli or insults. Methylation of histone proteins was demonstrated 50 years ago; however, the biological significance of each methylated residue and the integration between these histone markers are still under intensive investigation...
July 17, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/28717426/extracellular-vesicles-released-following-heat-stress-induce-bystander-effect-in-unstressed-populations
#6
Findlay Bewicke-Copley, Laura Ann Mulcahy, Laura Ann Jacobs, Priya Samuel, Naveed Akbar, Ryan Charles Pink, David Raul Francisco Carter
Cells naïve to stress can display the effects of stress, such as DNA damage and apoptosis, when they are exposed to signals from stressed cells; this phenomenon is known as the bystander effect. We previously showed that bystander effect induced by ionising radiation are mediated by extracellular vesicles (EVs). Bystander effect can also be induced by other types of stress, including heat shock, but it is unclear whether EVs are involved. Here we show that EVs released from heat shocked cells are also able to induce bystander damage in unstressed populations...
2017: Journal of Extracellular Vesicles
https://www.readbyqxmd.com/read/28717038/a-human-biofilm-disrupting-monoclonal-antibody-potentiates-antibiotic-efficacy-in-rodent-models-of-both-staphylococcus-aureus-and-acinetobacter-baumannii-infections
#7
Yan Q Xiong, Angeles Estellés, L Li, W Abdelhady, R Gonzales, Arnold S Bayer, Edgar Tenorio, Anton Leighton, Stefan Ryser, Lawrence M Kauvar
Many serious bacterial infections are antibiotic-refractory due to biofilm formation. A key structural component of biofilm is extracellular DNA which is stabilized by bacterial proteins, including those from the DNABII family. TRL1068 is a high affinity human monoclonal antibody against a DNABII epitope conserved across both gram-positive and gram-negative bacterial species. In the current study, the efficacy of TRL1068 for disruption of biofilm was demonstrated in vitro in the absence of antibiotics by scanning electron microscopy...
July 17, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28716362/phosphoenolpyruvate-phosphotransferase-system-components-positively-regulate-klebsiella-biofilm-formation
#8
Yu-Tze Horng, Chi-Jen Wang, Wen-Ting Chung, Huei-Jen Chao, Yih-Yuan Chen, Po-Chi Soo
BACKGROUND/PURPOSE: Klebsiella pneumoniae is one of the leading causes of device-related infections (DRIs), which are associated with attachment of bacteria to these devices to form a biofilm. The latter is composed of not only bacteria but also extracellular polymeric substances (EPSes) consisting of extracellular DNAs, polysaccharides, and other macromolecules. The phosphoenolpyruvate (PEP):carbohydrate phosphotransferase system (PTS) regulates diverse processes of bacterial physiology...
June 29, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28715618/measurement-of-net-formation-in-vitro-and-in-vivo-by-flow-cytometry
#9
Sakiko Masuda, Sakika Shimizu, Junji Matsuo, Yuka Nishibata, Yoshihiro Kusunoki, Fumihiko Hattanda, Haruki Shida, Daigo Nakazawa, Utano Tomaru, Tatsuya Atsumi, Akihiro Ishizu
Neutrophil extracellular traps (NETs) are extracellular chromatin fibers adorned with antimicrobial proteins, such as myeloperoxidase (MPO), which are extruded from activated neutrophils. NETosis is the metamorphosis of neutrophils with NET formation that follows decondensation of DNA and rupture of the plasma membrane. Although NETs play important roles in innate immunity, excessive formation of NETs can be harmful to the hosts. Until now, various methods for evaluation of NETs have been reported. Although each has a virtue, the gold standard has not been established...
July 17, 2017: Cytometry. Part A: the Journal of the International Society for Analytical Cytology
https://www.readbyqxmd.com/read/28712134/phenotypic-and-genotypic-characterisation-of-clinically-relevant-bacteria-isolated-from-dental-waste-and-waste-workers-hands-mucosas-and-coats
#10
Thaysa Leite Tagliaferri, Cristina Dutra Vieira, Maria Auxiliadora Roque de Carvalho, Luiz Carlos Duarte Ladeira, Paula Prazeres Magalhães, Luiz de Macêdo Farias, Simone Gonçalves Dos Santos
Infectious wastes are potential sources of pathogenic microorganisms, which may represent a risk to the professionals who manage them. In this study we aimed to characterize the infectious bacteria present in dental waste and waste workers. The dental waste produced over 24 hours was collected and waste workers were sampled by swabbing. Isolate resistance profiles were characterized by Vitek(®) and PCR and biofilm formation by Congo Red agar, string test and microtiter assay. To assess similarity between the waste and the workers' samples, a random amplified polymorphic DNA test was used...
July 16, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28710125/visualization-of-extracellular-dna-released-during-border-cell-separation-from-the-root-cap
#11
Fushi Wen, Gilberto Curlango-Rivera, David A Huskey, Zhongguo Xiong, Martha C Hawes
PREMISE OF THE STUDY: Root border cells are programmed to separate from the root cap as it penetrates the soil environment, where the cells actively secrete >100 extracellular proteins into the surrounding mucilage. The detached cells function in defense of the root tip by an extracellular trapping process that also requires DNA, as in mammalian white blood cells. Trapping in animals and plants is reversed by treatment with DNase, which results in increased infection. The goal of this study was to evaluate the role of DNA in the structural integrity of extracellular structures released as border cells disperse from the root tip upon contact with water...
July 14, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28708069/distinct-mechanisms-underlying-resveratrol-mediated-protection-from-types-of-cellular-stress-in-c6-glioma-cells
#12
John C Means, Bryan C Gerdes, Peter Koulen
The polyphenolic phytostilbene, trans-resveratrol, is found in high amounts in several types and tissues of plants, including grapes, and has been proposed to have beneficial effects in the central nervous system due to its activity as an antioxidant. The objective of the present study was to identify the mechanisms underlying the protective effects of resveratrol under conditions of oxidative stress or DNA damage, induced by the extracellularly applied oxidant, tert-butyl hydrogen peroxide, or UV-irradiation, respectively...
July 14, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28706768/dna-pk-and-p38-mapk-a-kinase-collusion-in-alzheimer-s-disease
#13
Jyotshna Kanungo
The pathogenesis of Alzheimer's disease (AD), characterized by prevalent neuronal death and extracellular deposit of amyloid plaques, is poorly understood. DNA lesions downstream of reduced DNA repair ability have been reported in AD brains. Neurons predominantly use a mechanism to repair double-strand DNA breaks (DSB), which is non-homologous end joining (NHEJ). NHEJ requires DNA-dependent protein kinase (DNA-PK) activity. DNA-PK is a holoenzyme comprising the p460 kD catalytic subunit (DNA-PKcs) and its activator Ku, a heterodimer of p86 and p70 subunits...
2017: Brain Disorders & Therapy
https://www.readbyqxmd.com/read/28706161/the-molecular-mechanisms-of-chemoresistance-in-cancers
#14
REVIEW
Hua-Chuan Zheng
Overcoming intrinsic and acquired drug resistance is a major challenge in treating cancer patients because chemoresistance causes recurrence, cancer dissemination and death. This review summarizes numerous molecular aspects of multi-resistance, including transporter pumps, oncogenes (EGFR, PI3K/Akt, Erk and NF-κB), tumor suppressor gene (p53), mitochondrial alteration, DNA repair, autophagy, epithelial-mesenchymal transition (EMT), cancer stemness, and exosome. The chemoresistance-related proteins are localized to extracellular ligand, membrane receptor, cytosolic signal messenger, and nuclear transcription factors for various events, including proliferation, apoptosis, EMT, autophagy and exosome...
July 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/28705839/circulating-dsdna-endothelial-injury-and-complement-activation-in-thrombotic-microangiopathy-and-gvhd
#15
Nicholas J Gloude, Pooja Khandelwal, Nathan Luebbering, Dana T Lounder, Sonata Jodele, Matthew N Alder, Adam Lane, Alyss Wilkey, Kelly E Lake, Bridget Litts, Stella M Davies
TA-TMA is a common and poorly recognized complication of HSCT associated with excessive complement activation, likely triggered by endothelial injury. An important missing piece is the link between endothelial injury and complement activation. We hypothesized that neutrophil extracellular traps (NETs) mechanistically link endothelial damage with complement activation and subsequent TA-TMA. Neutrophil activation releases granule proteins together with double stranded DNA (dsDNA), to form extracellular fibers known as NETs...
July 13, 2017: Blood
https://www.readbyqxmd.com/read/28705748/effect-of-secondary-metabolite-of-actinidia-deliciosa-on-the-biofilm-and-extra-cellular-matrix-components-of-acinetobacter-baumannii
#16
Vishvanath Tiwari, Deepika Tiwari, Varsha Patel, Monalisa Tiwari
Acinetobacter baumannii, opportunistic nosocomial pathogen, increases gradually in the clinical setup. The high level of resistance mechanisms acquired by these bacteria makes their eradication difficult and biofilm formation is one of them. Biofilm comprises of closely packed bacterial population crowded together by extra-cellular matrix (ECM). ECM contains bacterial secreted polymers such as exopolysaccharides (EPS), proteins and extracellular-DNA (e-DNA) and rarely amyloidogenic proteins. Biofilm offers protection of underlying bacterial population against chemotherapeutic agents and host immune system...
July 11, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28703297/neither-eosinophils-nor-neutrophils-require-atg5-dependent-autophagy-for-extracellular-dna-trap-formation
#17
Nina Germic, Darko Stojkov, Kevin Oberson, Shida Yousefi, Hans-Uwe Simon
The importance of extracellular traps (ETs) in innate immunity is well established, but the molecular mechanisms responsible for their formation remain unclear and in scientific dispute. ETs have been defined as extracellular DNA scaffolds associated with the granule proteins of eosinophils or neutrophils. They are capable of killing bacteria extracellularly. Based mainly on results with phosphoinositide 3-kinase (PI3K) inhibitors such as 3-methyladenine (3-MA) and wortmannin which are commonly used to inhibit autophagy, several groups have reported that autophagy is required for neutrophil extracellular trap (NET) formation...
July 13, 2017: Immunology
https://www.readbyqxmd.com/read/28703122/synergistic-effect-of-electrical-conductivity-and-biomolecules-on-human-meniscal-cell-attachment-growth-and-proliferation-in-poly-%C3%AE%C2%B5-caprolactone-nanocomposite-scaffolds
#18
Janarthanan Gopinathan, Mamatha M Pillai, K Santosh Sahanand, B K Dinakar Rai, Rajendran Selvakumar, Amitava Bhattacharyya
Poly-ε-caprolactone (PCL) based nanocomposite scaffolds with different concentrations of carbon nanofillers (carbon nanofibers (CNF), nanographite and exfoliated graphite) have been studied to investigate the effect of electrical conductivity and biomolecules supplementation for enhanced human meniscal cell attachment, growth and proliferation. Incorporation of carbon nanofillers was found to improve mechanical and electrical properties. CNF based nanocomposite scaffolds showed highest electrical conductivity with significant improvements in mechanical properties (more than 50% tensile strength increase than PCL with 10% (w/w) CNF)...
July 13, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28702884/decellularization-of-large-tendon-specimens-combination-of-manually-performed-freeze-thaw-cycles-and-detergent-treatment
#19
Susanne Pauline Roth, Ina Erbe, Janina Burk
Reliable decellularization techniques applicable to tendon tissue play a critical role in the field of current tissue engineering. Particularly, an application as three-dimensional culture model for in vitro research and translational approaches to establish graft-based tendon repair as a routine clinical tool represent two main application fields for decellularized tendon scaffolds. Considering methodological issues of tendon decellularization, one of the major challenges lies in the preservation of the tendon-specific extracellular matrix (ECM) architecture to reflect natural tissue characteristic as best as possible...
July 13, 2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28702014/detecting-the-diversity-of-mycoplasma-and-ureaplasma-endosymbionts-hosted-by-trichomonas-vaginalis-isolates
#20
Anastasios Ioannidis, Panagiota Papaioannou, Emmanouil Magiorkinis, Maria Magana, Vasiliki Ioannidou, Konstantina Tzanetou, Angeliki R Burriel, Maria Tsironi, Stylianos Chatzipanagiotou
Objectives: The symbiosis of Trichomonas vaginalis and Mycoplasma hominis is the first described association between two obligate human parasites. Trichomonas is the niche and the vector for the transmission of M. hominis infection. This clinically significant symbiosis may affect T. vaginalis virulence and susceptibility to treatment. The aims of this study were to investigate the intracellularly present Mycoplasma and Ureaplasma species in T. vaginalis strains isolated from the vaginal discharge of infected women as well as to trace the diversity pattern among the species detected in the isolated strains...
2017: Frontiers in Microbiology
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