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https://www.readbyqxmd.com/read/28534932/inhibition-of-prostate-cancer-rm1-cell-growth-in%C3%A2-vitro-by-hydroxyapatite-nanoparticle%C3%A2-delivered-short-hairpin-rnas-against-stat3
#1
Zuowen Liang, Hongliang Wang, Baofeng Guo, Fubiao Li, Jinsha Liu, Zhewen Liu, Libo Xu, Wenjing Yun, Xuejian Zhao, Ling Zhang
The present study investigated the effect of signal transducer and activator of transcription 3 (Stat3) interference on RM1 prostate cancer cell viability in vitro, using plasmid‑based Stat3 specific short hairpin RNA (sh‑Stat3) delivered by hydroxyapatite nanoparticles (HAP). HAP carrying sh‑Stat3 plasmids were transfected into tumor cells. MTT assays were used to measure RM1 cell viability 24 and 48 h following transfection, and the apoptosis rate and cell cycle phase distribution were determined by flow cytometry...
May 16, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28534032/cooking-fuel-and-respiratory-symptoms-among-people-living-with-hiv-in-rural-uganda
#2
Crystal M North, Linda Valeri, Peter W Hunt, A Rain Mocello, Jeffrey N Martin, Yap Boum, Jessica E Haberer, David R Bangsberg, David C Christiani, Mark J Siedner
Household air pollution (HAP) and chronic HIV infection are each associated with significant respiratory morbidity. Little is known about relationships between HAP and respiratory symptoms among people living with HIV. The objective of this study was to investigate the relationship between cooking fuel type and chronic respiratory symptoms in study participants from the Uganda AIDS Rural Treatment Outcomes Study. Study participants were enrolled at the time of antiretroviral therapy initiation and seen quarterly from 2005 to 2014 for health-focused questionnaires, CD4 count and HIV viral load...
April 2017: ERJ Open Research
https://www.readbyqxmd.com/read/28532096/preparation-of-nanocrystalline-forsterite-by-combustion-of-different-fuels-and-their-comparative-in-vitro-bioactivity-dissolution-behaviour-and-antibacterial-studies
#3
Rajan Choudhary, Prasanth Manohar, Jana Vecstaudza, Maria Josefa Yáñez-Gascón, Horacio Pérez Sánchez, Ramesh Nachimuthu, Janis Locs, Sasikumar Swamiappan
This study presents different fuels (Glycine and Urea) that can be used to synthesize nanocrystalline forsterite by the sol-gel combustion method. The weight change of precursor during thermal treatment was studied by thermo-gravimetric analysis (TGA). Pure forsterite was characterized by heating microscopy, Fourier transform infrared spectroscopy, X-ray Diffraction, Brunauer-Emmett-Teller, Scanning Electron Microscopy, and Energy dispersive X-ray spectroscopy. The HAP (hydroxyapatite) deposition ability, degradation and dissolution behaviour of forsterite was examined in simulated body fluid (SBF)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532083/effects-for-rapid-conversion-from-abalone-shell-to-hydroxyapaptite-nanosheets-by-ionic-surfactants
#4
Shengnan Zhong, Zhenliang Wen, Jingdi Chen, Qian Li, Xuetao Shi, Shinnjyh Ding, Qiqing Zhang
Hydroxyapatite (HAP) has been widely used for repairing or substituting human hard tissues. In this paper, two typical ionic surfactants, cation hexadecyltrimethylammonium bromide (CTAB) and anion sodium dodecyl sulfate (SDS), were used for rapid conversion of HAP from abalone shell. From field emission scanning electron microscopy (FESEM), the prepared HAP is flake-like structure. From X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and thermal analysis, these samples contain a small amount of calcium carbonate whose content gradually increases by increasing the surfactants...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532048/surface-grafting-of-eu-3-doped-luminescent-hydroxyapatite-nanomaterials-through-metal-free-light-initiated-atom-transfer-radical-polymerization-for-theranostic-applications
#5
Guangjian Zeng, Meiying Liu, Ruming Jiang, Chunning Heng, Qiang Huang, Liucheng Mao, Junfeng Hui, Fengjie Deng, Xiaoyong Zhang, Yen Wei
We reported a simple and efficient method to prepare the hydrophilic luminescent HAp polymer nanocomposites through the combination of ligand exchange and metal free light initiated surface-initiated atom transfer radical polymerization (SI-ATRP) using 10-phenylphenothiazine (PTH) as organic catalyst and 2-methacryloyloxyethyl phosphorylcholine (MPC) and itaconic acid (IA) as monomers. The biological imaging and drug delivery performance of HAp-poly(MPC-IA) nanorods were examined to evaluate their potential for biomedical applications...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531984/bioactive-materials-driven-primary-stability-on-titanium-biocomposites
#6
T A Dantas, C S Abreu, M M Costa, G Miranda, F S Silva, N Dourado, J R Gomes
The Ti6Al4V alloy constitutes an alternative choice to the most common metal-polymer solutions for total hip arthroplasty (THA) due to good biocompatibility, optimal mechanical properties and high load bearing capacity. However, as Ti6Al4V is not bioactive in its conventional form, hydroxyapatite (HAp) and tricalcium phosphate (TCP) have been widely used as coatings of metal prostheses due to their osteogenic properties and ability to form strong bonds with bone tissue. A promising approach consists in creating a bioactive surface metal matrix composite Ti6Al4V+β-TCP or Ti6Al4V+HAp, obtained by hot pressing (HP) of powders...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531974/biomimetic-collagen-phospholipid-coatings-improve-formation-of-hydroxyapatite-nanoparticles-on-titanium
#7
Gilia C M Ruiz, Marcos A E Cruz, Amanda N Faria, Daniela C Zancanela, Pietro Ciancaglini, Ana P Ramos
Osseointegration between the surface of a certain material and the host tissue helps to evaluate the potential use of biomaterials in bone replacement. The physicochemical properties and biochemical composition of the material's surface regulates osseointegration. This study investigates how collagen into biomimetic matrixes affects hydroxyapatite (HAp) growth. Collagen was inserted into insoluble Langmuir monolayers containing either 1,2-dipalmitoyl-sn-glycero-3-phosphatidylcholine (DPPC) or octadecylphosphonic acid (OPA) and transferred to titanium (Ti) supports by means of the Langmuir-Blodgett (LB) technique...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28527187/quantitative-stereological-analysis-of-the-highly-porous-hydroxyapatite-scaffolds-using-x-ray-cm-and-sem
#8
Justyna Zygmuntowicz, Aneta Zima, Joanna Czechowska, Karol Szlazak, Anna Ślosarczyk, Katarzyna Konopka
BACKGROUND: Material properties of the scaffolds as well as their microstructure are vital in determining in vivo cellular response. Three-dimensional (3D), highly porous scaffolds are used in tissue engineering to provide a suitable microenvironment and to support regeneration of bone. Both pore sizes and their architecture, in particular interconnection density, impact functionality of scaffold during its biomedical applications. OBJECTIVE: In this paper a comparative study of the microstructure of highly porous hydroxyapatite scaffolds produced via gelcasting of foamed slurries and replication of polyurethane sponge were carried out...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28526799/acquired-resistance-to-macrolides-in-pseudomonas-aeruginosa-from-cystic-fibrosis-patients
#9
Muhammad-Hariri Mustafa, Shaunak Khandekar, Michael M Tunney, J Stuart Elborn, Barbara C Kahl, Olivier Denis, Patrick Plésiat, Hamidou Traore, Paul M Tulkens, Francis Vanderbist, Françoise Van Bambeke
Cystic fibrosis (CF) patients receive chronic treatment with macrolides for their antivirulence and anti-inflammatory properties. We, however, previously showed that Pseudomonas aeruginosa, considered as naturally resistant to macrolides, becomes susceptible when tested in a eukaryotic medium rather than a conventional broth.We therefore looked for specific macrolide resistance determinants in 333 CF isolates from four European CF centres in comparison with 48 isolates from patients suffering from hospital-acquired pneumonia (HAP)...
May 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/28522786/pilonidal-sinus-finding-the-righttrack-for-treatment
#10
Wojciech Hap, Ewelina Frejlich, Julia Rudno-Rudzińska, Krzysztof Kotulski, Krzysztof Kurnol, Katarzyna Hap, Adam Skalski, Wojciech Kielan
Pilonidal cyst is a troublesome condition affecting usually young people. It significantly influences quality of life and causes low self-esteem. Despite its known pathophysiology and numerous therapeutic methods available, pilonidal cysts still constitute a significant problem in general surgery. A large number of surgical techniques indicates the lack of a single method that ensures therapeutic success, and frequent complications cause both patient's dissatisfaction and frustration of the operator. In many cases, therapy is based on methods developed in a given healthcare center and their efficacy is usually not scientifically verified...
February 28, 2017: Polski Przeglad Chirurgiczny
https://www.readbyqxmd.com/read/28517977/injectable-chelate-setting-hydroxyapatite-cement-prepared-by-using-chitosan-solution-fabrication-material-properties-biocompatibility-and-osteoconductivity
#11
Toshiisa Konishi, Michiyo Honda, Masaki Nagaya, Hiroshi Nagashima, Eng San Thian, Mamoru Aizawa
An injectable chelate-setting hydroxyapatite cement (IP6-HAp), formed by chelate-bonding capability of inositol phosphate (IP6), was developed. The effects of ball-milling duration of starting HAp powder and IP6 concentration on the material properties such as injectability and mechanical strength of the cement were examined. The cement powder was prepared by ball-milling the as-synthesized HAp powder for 5 min using ZrO2 beads with a diameter of 10 mm, followed by another 60 min with ZrO2 beads with a diameter of 2 mm, and thereafter surface-modified with 5000 ppm of IP6 solution...
May 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28515776/hormonally-active-phytochemicals-and-vertebrate-evolution
#12
Max R Lambert, Thea M Edwards
Living plants produce a diversity of chemicals that share structural and functional properties with vertebrate hormones. Wildlife species interact with these chemicals either through consumption of plant materials or aquatic exposure. Accumulating evidence shows that exposure to these hormonally active phytochemicals (HAPs) often has consequences for behavior, physiology, and fecundity. These fitness effects suggest there is potential for an evolutionary response by vertebrates to HAPs. Here, we explore the toxicological HAP-vertebrate relationship in an evolutionary framework and discuss the potential for vertebrates to adapt to or even co-opt the effects of plant-derived chemicals that influence fitness...
June 2017: Evolutionary Applications
https://www.readbyqxmd.com/read/28503805/development-of-a-siyalon-glaze-for-improved-osteoconductivity-of-implantable-medical-devices
#13
Ryan M Bock, Elia Marin, Alfredo Rondinella, Francesco Boschetto, Tetsuya Adachi, Bryan J McEntire, B Sonny Bal, Giuseppe Pezzotti
The application of bioactive coatings onto orthopaedic appliances is commonly performed to compensate for the otherwise bioinert nature of medical devices and to improve their osseointegration. Calcium phosphates, hydroxyapatite (HAp), and bioglasses are commercially available for this purpose. Until recently, few other inorganic compounds have been identified with similar biofunctionality. However, silicon nitride (Si3 N4 ) has emerged as a new orthopaedic material whose unique surface chemistry also enhances osteoconductivity...
May 15, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28497908/the-molybdenum-cofactor-enzyme-marc-moonlighting-or-promiscuous-enzyme
#14
REVIEW
Angel Llamas, Alejandro Chamizo-Ampudia, Manuel Tejada-Jimenez, Aurora Galvan, Emilio Fernandez
Molybdenum (Mo) is present in the active center of eukaryotic enzymes as a tricyclic pyranopterin chelate compound forming the Mo Cofactor (Moco). Four Moco containing enzymes are known in eukaryotes, nitrate reductase (NR), sulfite oxidase (SO), xanthine oxidoreductase (XOR), and aldehyde oxidase (AO). A fifth Moco enzyme has been recently identified. Because of the ability of this enzyme to convert by reduction several amidoximes prodrugs into their active amino forms, it was named mARC (mitochondrial Amidoxime Reducing Component)...
May 12, 2017: BioFactors
https://www.readbyqxmd.com/read/28497295/assessing-the-risk-and-disease-burden-of-clostridium-difficile-infection-among-patients-with-hospital-acquired-pneumonia-at-a-university-hospital-in-central-china
#15
Chunhui Li, Juping Duan, Sidi Liu, Xiujuan Meng, Chenchao Fu, Cui Zeng, Anhua Wu
PURPOSE: Hospital-acquired pneumonia (HAP) remains one of the major hospital-acquired infections in China. Antibiotic treatment of HAP may lead to subsequent Clostridium difficile infection (CDI). Baseline data on the occurrence of CDI among HAP patients in China are currently unavailable. This study examines the risk and disease burden of CDI among HAP hospitalized patients (HAP-CDI). METHODS: We conducted a prospective study among ICU patients with HAP and hospital-onset diarrhea from January 2014 to December 2014 in a teaching hospital in China...
May 11, 2017: Infection
https://www.readbyqxmd.com/read/28496015/determining-the-possible-etiology-of-hospital-acquired-pneumonia-using-a-clone-library-analysis-in-japan
#16
Kazuhiro Yatera, Shingo Noguchi, Kei Yamasaki, Toshinori Kawanami, Kazumasa Fukuda, Keisuke Naito, Kentaro Akata, Takashi Kido, Hiroshi Ishimoto, Noriho Sakamoto, Hatsumi Taniguchi, Hiroshi Mukae
Obtaining precise etiological information regarding causative bacteria is important for the proper use of antimicrobials in hospital-acquired pneumonia (HAP), which is associated with a high rate of mortality. The aim of this study was to comparatively investigate the bacterial diversity in bronchoalveolar lavage fluid (BALF) in Japanese patients with HAP by the clone library method using the 16S rRNA gene. This study included Japanese patients with HAP who were treated at our hospital and referring hospitals...
May 2017: Tohoku Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28494435/impact-of-respiratory-viruses-in-hospital-acquired-pneumonia-in-the-intensive-care-unit-a-single-center-retrospective-study
#17
Paul Loubet, Guillaume Voiriot, Nadhira Houhou-Fidouh, Mathilde Neuville, Lila Bouadma, Francois-Xavier Lescure, Diane Descamps, Jean-François Timsit, Yazdan Yazdanpanah, Benoit Visseaux
BACKGROUND: Data on the frequency and role of respiratory viruses (RVs) in hospital-acquired pneumonia (HAP) are still scarce. OBJECTIVES: We assessed the proportion of RVs and their impact on the outcome of hospital-acquired pneumonia (HAP) in the intensive care unit (ICU). STUDY DESIGN: Cases of HAP were retrospectively selected among patients who underwent screening for RVs by multiplex PCR (mPCR) in the ICU of a French tertiary care hospital from May 2014 to April 2016...
April 22, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28487722/association-mapping-reveals-novel-genetic-loci-contributing-to-flooding-tolerance-during-germination-in-indica-rice
#18
Mengchen Zhang, Qing Lu, Wei Wu, Xiaojun Niu, Caihong Wang, Yue Feng, Qun Xu, Shan Wang, Xiaoping Yuan, Hanyong Yu, Yiping Wang, Xinghua Wei
Rice (Oryza sativa L.) is the only cereal crop that possesses the ability to germinate under flooded or other oxygen-deficient conditions. Rapid elongation of the coleoptile is a perfect response to flooding during germination, with coleoptile length differing among various rice varieties. Despite multiple studies have uncovered valuable information concerning this trait by focusing on the physiological metabolism of oxygen stress, the underlying genetic mechanism still remains unknown. In the present study, we screened coleoptile lengths of 432 indica varieties germinated in two environments (normal and flooded) and found more variation existing in flooded coleoptile length (FCL) rather than in normal coleoptile length (NCL)...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28486755/mechanical-stimulations-on-human-bone-marrow-mesenchymal-stem-cells-enhance-cells-differentiation-in-a-3d-layered-scaffold
#19
Jessica Schiavi, Loïc Reppel, Naceur Charif, Natalia de Isla, Didier Mainard, Nadia Benkirane-Jessel, Jean-François Stoltz, Rachid Rahouadj, Céline Huselstein
Scaffolds laden with stem cells are a promising approach for articular cartilage repair. Investigations have shown that implantation of artificial matrices, growth factors or chondrocytes can stimulate cartilage formation; but no existing strategy apply mechanical stimulation on stratified scaffolds to mimic the cartilage environment. The purpose of this study was to adapt a spraying method for stratified cartilage engineering and to stimulate the bio-substitute. Human Mesenchymal Stem Cells from Bone Marrow (BM-MSCs) were seeded in an Alginate/Hyaluronic Acid (Alg/HA) or Alg/Hydroxyapatite (Alg/Hap) gel to direct cartilage and hypertrophic cartilage/sub-chondral bone differentiation, respectively, in different layers linked with polyelectrolyte multilayer films, in a single scaffold...
May 9, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28483692/biocompatible-nanostructured-solid-adhesives-for-biological-soft-tissues
#20
Masahiro Okada, Akira Nakai, Emilio Satoshi Hara, Tetsushi Taguchi, Takayoshi Nakano, Takuya Matsumoto
Over the past few years, the development of novel adhesives for biological soft tissue adhesion has gained significant interest. Such adhesives should be non-toxic and biocompatible. In this study, we synthesized a novel solid adhesive using nanostructured hydroxyapatite (HAp) and evaluated its physical adhesion properties through in vitro testing with synthetic hydrogels and mice soft tissues. The results revealed that the HAp-nanoparticle dispersions and HAp-nanoparticle-assembled nanoporous plates showed efficient adhesion to the hydrogels...
May 5, 2017: Acta Biomaterialia
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