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https://www.readbyqxmd.com/read/28924257/electrodiffusion-phenomena-in-neuroscience-a-neglected-companion
#1
REVIEW
Leonid P Savtchenko, Mu Ming Poo, Dmitri A Rusakov
The emerging technological revolution in genetically encoded molecular sensors and super-resolution imaging provides neuroscientists with a pass to the real-time nano-world. On this small scale, however, classical principles of electrophysiology do not always apply. This is in large part because the nanoscopic heterogeneities in ionic concentrations and the local electric fields associated with individual ions and their movement can no longer be ignored. Here, we review basic principles of molecular electrodiffusion in the cellular environment of organized brain tissue...
September 19, 2017: Nature Reviews. Neuroscience
https://www.readbyqxmd.com/read/28923539/efficient-vegf-targeting-delivery-of-dox-using-bevacizumab-conjugated-sio2-ldh-for-anti-neuroblastoma-therapy
#2
Rongrong Zhu, Zhaoqi Wang, Peng Liang, Xiaolie He, Xizhen Zhuang, Ruiqi Huang, Mei Wang, Qigang Wang, Yechang Qian, Shilong Wang
Vascular endothelial growth factor (VEGF) plays an important role in angiogenesis and is highly expressed in carcinoma, which make it an important target for tumor targeting therapy. Neuroblastoma is the main cause for cancer-related death in children. Like most solid tumors, it is also accompanied with the overexpression of VEGF. Doxorubicin Hydrochloride (DOX), a typical chemotherapeutic agent, exhibits efficient anticancer activities for various cancers. However, DOX, without targeting ability, usually causes severe damage to normal tissues...
September 15, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28923538/three-dimensional-nano-architected-scaffolds-with-tunable-stiffness-for-efficient-bone-tissue-growth
#3
Alessandro Maggi, Hanqing Li, Julia R Greer
The precise mechanisms that lead to orthopedic implant failure are not well understood; it is believed that the micromechanical environment at the bone-implant interface regulates structural stability of an implant. In this work, we seek to understand how the 3D mechanical environment of an implant affects bone formation during early osteointegration. We employed two-photon lithography (TPL) direct laser writing to fabricate 3-dimensional rigid polymer scaffolds with tetrakaidecahedral periodic geometry, herewith referred to as nanolattices, whose strut dimensions were on the same order as osteoblasts' focal adhesions (∼2μm) and pore sizes on the order of cell size, ∼10μm...
September 15, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28923112/cobalt-nanoparticles-induce-lung-injury-dna-damage-and-mutations-in-mice
#4
Rong Wan, Yiqun Mo, Zhenyu Zhang, Mizu Jiang, Shichuan Tang, Qunwei Zhang
BACKGROUND: We and other groups have demonstrated that exposure to cobalt nanoparticles (Nano-Co) caused oxidative stress and inflammation, which have been shown to be strongly associated with genotoxic and carcinogenic effects. However, few studies have reported Nano-Co-induced genotoxic effects in vivo. Here, we propose that Nano-Co may have high genotoxic effects due to their small size and high surface area, which have high capacity for causing oxidative stress and inflammation. METHODS: gpt delta transgenic mice were used as our in vivo study model...
September 18, 2017: Particle and Fibre Toxicology
https://www.readbyqxmd.com/read/28921946/biomimetic-magnetosomes-as-versatile-artificial-antigen-presenting-cells-to-potentiate-t-cell-based-anticancer-therapy
#5
Qianmei Zhang, Wei Wei, Peiling Wang, Liping Zuo, Feng Li, Jin Xu, Xiaobo Xi, Xiaoyong Gao, Guanghui Ma, Hai-Yan Xie
Adoptive T-cell transfer for cancer therapy relies on both effective ex vivo T cell expansion and in vivo targeting performance. One promising but challenging method for accomplishing this purpose is to construct multifunctional artificial antigen-presenting cells (aAPCs). We herein developed biomimetic magnetosomes as versatile aAPCs, wherein magnetic nanoclusters were coated with azide-engineered leucocyte membranes and then decorated with T-cell stimuli through copper-free click chemistry. These novel nano aAPCs not only exhibited high performance for antigen-specific cytotoxic T cell (CTL) expansion and stimulation but also visually and effectively guided reinfused CTLs to tumor tissues through magnetic resonance imaging and magnetic control...
September 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28917880/intercalated-chitosan-hydroxyapatite-nanocomposites-promising-materials-for-bone-tissue-engineering-applications
#6
Muhammad Anwaar Nazeer, Emel Yilgör, Iskender Yilgör
Preparation and characterization of chitosan/hydroxyapatite (CS/HA) nanocomposites displaying an intercalated structure is reported. Hydroxyapatite was synthesized through sol-gel process. Formic acid was introduced as a new solvent to obtain stable dispersions of nano-sized HA particles in polymer solution. CS/HA dispersions with HA contents of 5, 10 and 20% by weight were prepared. Self-assembling of HA nanoparticles during the drying of the solvent cast films led to the formation of homogeneous CS/HA nanocomposites...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28906132/effects-of-different-dietary-sources-and-levels-of-selenium-supplements-on-growth-performance-antioxidant-status-and-immune-parameters-in-ross-308-broiler-chickens
#7
R Bakhshalinejad, Reza Akbari Moghaddam Kakhki, E Zoidis
1. Although different impacts of various sources of Selenium (Se) on chicken performance have been largely studied, there is a lack of comparative experiments studying the effects of these sources on immune system and antioxidant indices of broiler tissues. The aim of this study was to examine the effects of various sources and levels of dietary Se supplements on performance, antioxidant status and immune parameters in Ross 308 broiler chickens. 2. A total of 1200 one-day-old male broilers (Ross × Ross 308) were divided into 8 treatments with 6 replicate pens and 25 birds per pen...
September 14, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28901265/stereocomplexation-assisted-assembly-of-poly-g-glutamic-acid-graft-polylactide-nano-micelles-and-their-efficacy-as-anticancer-drug-carrier
#8
Shulin Dai, Yucheng Feng, Shuyi Li, Yuxiao Chen, Meiqing Liu, Chao Zhang, Wei Zhang, Yihua Yin
Micelles as drug carriers are characterized by their inherent instability due to the weak physical interactions that facilitate the self-assembly of amphiphilic block copolymers. As one of the strong physical interactions, the stereocomplexation between equal molar of enantiomeric polylactides, i.e., the poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA), may be harnessed to obtain micelles with enhanced stability and drug loading capacity and consequent sustained release. In this paper, stereocomplexed micelles (γ-PGA-g-PLA micelles) were fabricated from the stereocomplexation between poly(γ-glutamic acid)-graft-PLLA (γ-PGA-g-PLLA) and poly(γ-glutamic acid)-graft-PDLA (γ-PGA-g-PDLA)...
September 11, 2017: Anti-cancer Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/28900193/synchrotron-based-%C3%AE-xrf-mapping-and-%C3%AE-ftir-microscopy-enable-to-look-into-the-fate-and-effects-of-tattoo-pigments-in-human-skin
#9
Ines Schreiver, Bernhard Hesse, Christian Seim, Hiram Castillo-Michel, Julie Villanova, Peter Laux, Nadine Dreiack, Randolf Penning, Remi Tucoulou, Marine Cotte, Andreas Luch
The increasing prevalence of tattoos provoked safety concerns with respect to particle distribution and effects inside the human body. We used skin and lymphatic tissues from human corpses to address local biokinetics by means of synchrotron X-ray fluorescence (XRF) techniques at both the micro (μ) and nano (ν) scale. Additional advanced mass spectrometry-based methodology enabled to demonstrate simultaneous transport of organic pigments, heavy metals and titanium dioxide from skin to regional lymph nodes...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28899817/acute-oral-toxicity-study-of-magnesium-oxide-nanoparticles-and-microparticles-in-female-albino-wistar-rats
#10
Bhanuramya Mangalampalli, Naresh Dumala, Paramjit Grover
Advancements in nanotechnology have led to the development of the nanomedicine, which involves nanodevices for diagnostic and therapeutic purposes. A key requirement for the successful use of the nanoparticles (NPs) in biomedical applications is their good dispensability, colloidal stability in biological media, internalization efficiency, and low toxicity. Therefore, toxicological profiling is necessary to understand the mechanism of NPs and microparticles (MPs). MgO NPs have attracted wide scientific interest due to ease of synthesis, chemical stability and unique properties...
September 9, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/28892393/micrometre-sized-magnesium-whitlockite-crystals-in-micropetrosis-of-bisphosphonate-exposed-human-alveolar-bone
#11
Furqan Ali A Shah, Bryan E J Lee, James Tedesco, Cecilia L Wexell, Cecilia Persson, Peter Thomsen, Kathryn Grandfield, Anders Palmquist
Osteocytes are contained within spaces called lacunae and play a central role in bone remodelling. Administered frequently to prevent osteoporotic fractures, anti-resorptive agents such as bisphosphonates suppress osteocyte apoptosis and may be localised within osteocyte lacunae. Bisphosphonates also reduce osteoclast viability, and thereby hinder the repair of damaged tissue. Osteocyte lacunae contribute to toughening mechanisms. Following osteocyte apoptosis, the lacunar space undergoes mineralisation, termed 'micropetrosis'...
September 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28892099/glomerular-barrier-behaves-as-an-atomically-precise-bandpass-filter-in-a-sub-nanometre-regime
#12
Bujie Du, Xingya Jiang, Anindita Das, Qinhan Zhou, Mengxiao Yu, Rongchao Jin, Jie Zheng
The glomerular filtration barrier is known as a 'size cutoff' slit, which retains nanoparticles or proteins larger than 6-8 nm in the body and rapidly excretes smaller ones through the kidneys. However, in the sub-nanometre size regime, we have found that this barrier behaves as an atomically precise 'bandpass' filter to significantly slow down renal clearance of few-atom gold nanoclusters (AuNCs) with the same surface ligands but different sizes (Au18, Au15 and Au10-11). Compared to Au25 (∼1.0 nm), just few-atom decreases in size result in four- to ninefold reductions in renal clearance efficiency in the early elimination stage, because the smaller AuNCs are more readily trapped by the glomerular glycocalyx than larger ones...
September 11, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28891224/smv1-an-extremely-stable-thermophilic-virus-platform-for-nanoparticle-trafficking-in-the-mammalian-gi-tract
#13
Kristine B Uldahl, Seth T Walk, Stephen C Olshefsky, Mark J Young, Xu Peng
AIMS: analysis of the stability and safety of Sulfolobus monocaudavirus 1 (SMV1) during passage through the mammalian GI tract. METHODS AND RESULTS: A major challenge of using nano-vectors to target gut microbiome is their survival during passage through the extremely acidic and proteolytic environment of the mammalian GI tract. Here we investigated the thermo-acidophilic archaeal virus SMV1 as a candidate therapeutic nano-vector for the distal mammalian GI tract microbiome...
September 11, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28888010/decoration-of-gold-nanoparticles-with-thiolated-ph-responsive-polymeric-peg-b-p-2-dimethylamio-ethyl-methacrylate-co-itaconic-acid-shell-a-novel-platform-for-targeting-of-anticancer-agent
#14
Marjan Ghorbani, Hamed Hamishehkar
The aim of this study was to design and develop a new pH-responsive nano-platform for controlled and targeted delivery of anticancer drugs. Engineering of pH-responsive nanocarriers was prepared via decoration of gold nanoparticles (NPs) by thiolated (methoxy-poly(ethylene glycol)-b-poly((2-dimethylamino) ethyl methacrylate-co-itaconic acid) (mPEG-b-p(DMAEMA-co-IA) copolymer and fully characterized by various techniques and subsequently used for loading and targeted delivery of anticancer agent, methotrexate (MTX)...
December 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28888007/nano%C3%A2-calcium-phosphate-bone-cement-based-on-si-stabilized-%C3%AE-tricalcium-phosphate-with-improved-mechanical-properties
#15
M Roozbahani, M Alehosseini, M Kharaziha, R Emadi
This study aimed to develop nano‑calcium phosphate cement (nCPC) and evaluate the effect of nanosized precursors on mechanical, physical and handling properties (injectability and setting time) as well as conversion rate of nano-reactants into nano-hydroxyapatite (nHA). In this study, while alpha tricalcium phosphate (α-TCP, 98wt%) and HA (2wt%) were applied as the powder phase, 2.5wt% NaH2PO4 solution was used as liquid phase of cement. Before nano-CPC preparation, Si-stabilized α-TCP nanopowder with particle size of 10±3...
December 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28884578/enhanced-anti-infective-efficacy-of-zno-nano-reservoirs-through-a-combination-of-intrinsic-anti-biofilm-activity-and-reinforced-innate-defense
#16
Jiaxing Wang, Huaijuan Zhou, Geyong Guo, Jiaqi Tan, Qiaojie Wang, Jin Tang, Wei Liu, Hao Shen, Jinhua Li, Xianlong Zhang
The increasing prevalence of implant-associated infections (IAIs) imposes a heavy burden on patients and medical providers. Bacterial biofilms are recalcitrant to antiseptic drugs and local immune defense and can attenuate host proinflammatory response to interfere with bacterial clearance. Zinc oxide nanoparticles (ZnO NPs) play a dual role in antibacterial and immunomodulatory activities but compromise the cytocompatibility due to their intracellular uptake. Here, ZnO NPs were immobilized on titanium to form homogeneous nanofilms (from discontinuous to continuous) through magnetron sputtering and the possible antimicrobial activity and immunomodulatory effect of nano-ZnO films were investigated...
September 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28882077/review-the-potential-impact-of-surface-crystalline-states-of-titanium-for-biomedical-applications
#17
Julien Barthes, Sait Ciftci, Florian Ponzio, Helena Knopf-Marques, Liza Pelyhe, Alexandru Gudima, Imre Kientzl, Eszter Bognár, Miklós Weszl, Julia Kzhyshkowska, Nihal Engin Vrana
In many biomedical applications, titanium forms an interface with tissues, which is crucial to ensure its long-term stability and safety. In order to exert control over this process, titanium implants have been treated with various methods that induce physicochemical changes at nano and microscales. In the past 20 years, most of the studies have been conducted to see the effect of topographical and physicochemical changes of titanium surface after surface treatments on cells behavior and bacteria adhesion...
September 7, 2017: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/28880464/dual-growth-factor-immobilized-asymmetrically-porous-membrane-for-bone-to-tendon-interface-regeneration-on-rat-patellar-tendon-avulsion-model
#18
Joong-Hyun Kim, Se Heang Oh, Hyun Ki Min, Jin Ho Lee
Insufficient repair of the bone-to-tendon interface (BTI) with structural/compositional gradients has been a significant challenge in orthopedics. In this study, dual growth factor [platelet-derived growth factor-BB (PDGF-BB) and bone morphogenetic protein-2 (BMP-2)]-immobilized polycaprolactone (PCL)/Pluronic F127 asymmetrically porous membrane was fabricated to estimate its feasibility as a potential strategy for effective regeneration of BTI injury. The growth factors immobilized (via heparin-intermediated interactions) on the membrane were continuously released for up to ∼80% of the initial loading amount after 5 weeks without a significant initial burst...
September 7, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28880433/the-effect-of-hydroxyapatite-nanoparticles-on-mechanical-behavior-and-biological-performance-of-porous-shape-memory-polyurethane-scaffolds
#19
Juhong Yu, Hong Xia, Akira Teramoto, Qing-Qing Ni
The scaffold which provides space for cell growth, proliferation and differentiation, is a key factor in bone tissue engineering. However, improvements in scaffold design are needed to precisely match the irregular boundaries of bone defects as well as facilitate clinical application. In this study, controllable three-dimensional (3D) porous shape memory polyurethane/nano-hydroxyapatite (SMPU/nHAP) composite scaffold was successfully fabricated for bone defect reparation. Detailed studies were performed to evaluate its structure, apparent density, porosity and mechanical properties, emphasizing the contribution of nHAP particles on shape recovery behaviors and biological performance in vitro...
September 7, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28879798/inhalation-exposure-of-nano-diamond-induced-oxidative-stress-in-lung-heart-and-brain
#20
Yahya Khosravi, Ahmad Salimi, Jalal Pourahmad, Parvaneh Naserzadeh, Enayatollah Seydi
1. Today, diamond nanoparticles have several industrial applications. Nano diamond (ND) as a carbon allotrope diffuses in the air easily during producing and processing procedures. 2. In this study, we investigated sub-acute exposed to ND at the exposure chamber in mice. The animals were divided into two groups (control and exposed a group to ND at the concentration of 3 µg/m(3) for 3 h/day, 5 days/week, for 30-days) in a whole-body inhalation chamber. 3. Our result showed that exposure to ND-induced the hematological and biochemical changes...
September 7, 2017: Xenobiotica; the Fate of Foreign Compounds in Biological Systems
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