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https://www.readbyqxmd.com/read/28634933/3d-cell-culture-in-interpenetrating-networks-of-alginate-and-rbm-matrix
#1
Katrina Wisdom, Ovijit Chaudhuri
Altered tissue mechanical properties have been implicated in many key physiological and pathological processes. Hydrogel-based materials systems, made with native extracellular matrix (ECM) proteins, nonnative biopolymers, or synthetic polymers are often used to study these processes in vitro in 3D cell culture experiments. However, each of these materials systems present major limitations when used in mechanobiological studies. While native ECM-based hydrogels may enable good recapitulation of physiological behavior, the mechanics of these hydrogels are often manipulated by increasing or decreasing the protein concentration...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28619821/convergence-of-signaling-pathways-underlying-habenular-formation-and-axonal-outgrowth
#2
Sara Roberson, Marnie E Halpern
The habenular nuclei are a conserved integrating center in the vertebrate epithalamus where they modulate diverse behaviors. Despite their importance, our understanding of habenular development is incomplete. Time-lapse imaging and fate mapping demonstrate that the dorsal habenulae (dHb) of zebrafish are derived from dbx1b-expressing (dbx1b(+)) progenitors, which transition into cxcr4b-expressing neuronal precursors. The precursors give rise to differentiated neurons whose axons innervate the midbrain interpeduncular nucleus (IPN)...
June 15, 2017: Development
https://www.readbyqxmd.com/read/28576510/the-role-of-the-habenula-in-the-transition-from-reward-to-misery-in-substance-use-and-mood-disorders
#3
REVIEW
Albert Batalla, Judith R Homberg, Tatiana V Lipina, Guillaume Sescousse, Maartje Luijten, Svetlana A Ivanova, Arnt F A Schellekens, Anton J M Loonen
The habenula (Hb) is an evolutionary well-conserved structure located in the epithalamus. The Hb receives inputs from the septum, basal ganglia, hypothalamus, anterior cingulate and medial prefrontal cortex, and projects to several midbrain centers, most importantly the inhibitory rostromedial tegmental nucleus (RMTg) and the excitatory interpeduncular nucleus (IPN), which regulate the activity of midbrain monoaminergic nuclei. The Hb is postulated to play a key role in reward and aversion processing across species, including humans, and to be implicated in the different stages of transition from recreational drug intake to addiction and co-morbid mood disorders...
May 30, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28553203/autophagy-as-an-emerging-common-pathomechanism-in-inherited-peripheral-neuropathies
#4
REVIEW
Mansour Haidar, Vincent Timmerman
The inherited peripheral neuropathies (IPNs) comprise a growing list of genetically heterogeneous diseases. With mutations in more than 80 genes being reported to cause IPNs, a wide spectrum of functional consequences is expected to follow this genotypic diversity. Hence, the search for a common pathomechanism among the different phenotypes has become the holy grail of functional research into IPNs. During the last decade, studies on several affected genes have shown a direct and/or indirect correlation with autophagy...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28552601/habenula-and-interpeduncular-nucleus-differentially-modulate-predator-odor-induced-innate-fear-behavior-in-rats
#5
Daniel Vincenz, Kerstin E A Wernecke, Markus Fendt, Jürgen Goldschmidt
Fear is an important behavioral system helping humans and animals to survive potentially dangerous situations. Fear can be innate or learned. Whereas the neural circuits underlying learned fear are already well investigated, the knowledge about the circuits mediating innate fear is still limited. We here used a novel, unbiased approach to image in vivo the spatial patterns of neural activity in odor-induced innate fear behavior in rats. We intravenously injected awake unrestrained rats with a 99m-technetium labeled blood flow tracer (99mTc-HMPAO) during ongoing exposure to fox urine or water as control, and mapped the brain distribution of the trapped tracer using single-photon emission computed tomography (SPECT)...
May 26, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28544461/semi-ipns-with-moisture-triggered-shape-memory-and-self-healing-properties
#6
Zhi-Chao Jiang, Yao-Yu Xiao, Yang Kang, Bang-Jing Li, Sheng Zhang
Moisture or water has the advantages of being green, inexpensive, and moderate. However, it is challenging to endow water-induced shape memory property and self-healing capability to one single polymer because of the conflicting structural requirement of the two types of materials. In this study, this problem is solved through introducing two kinds of supramolecular interactions into semi-interpenetrating polymer networks (semi-IPNs). The hydrogen bonds function as water-sensitive switches, making the materials show moisture-induced shape memory effect...
May 23, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28537298/vibrational-and-impedance-spectroscopic-analyses-of-semi-interpenetrating-polymer-networks-as-solid-polymer-electrolytes
#7
Nimai Bar, Pratyay Basak, Yoed Tsur
Semi-interpenetrating polymer networks (semi-IPNs) with significant ionic conductivity (10(-4) S cm(-1) at ambient temperature) were studied by vibrational and impedance spectroscopies coupled with advanced analysis procedures. Vibrational spectroscopy recognized the numbers of free ions, ion pairs, ion-polymers and hydrogen bonds within the solid polymer electrolyte matrices (SPE). Electrochemical impedance spectroscopy (EIS) was used to quantify the bulk resistance and bulk relaxation time. The analyses used discrepancy-complexity plots to assess the number of free parameters properly, and EIS was further analyzed using impedance spectroscopy genetic programming (ISGP)...
June 7, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28521995/synthesis-of-full-interpenetrating-hemicellulose-hydrogel-networks
#8
Laleh Maleki, Ulrica Edlund, Ann-Christine Albertsson
Two methods with different cross-linking mechanisms for designing hemicellulose-based full interpenetrating polymer networks (IPNs) were developed through the sequential synthesis of full IPNs from O-acetyl-galactoglucomannan (AcGGM) utilizing free-radical polymerization and a thiol-ene click reaction. A faster swelling rate was observed for all IPN formulations compared with the single-network gels. The highly porous structure of the IPNs with small interconnected pores was verified using scanning electron microscopy...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28513056/lessons-learned-from-a-pilot-study-of-an-indigenous-patient-navigator-intervention-in-queensland-australia
#9
C M Bernardes, J Martin, P Cole, T Kitchener, G Cowburn, G Garvey, E Walpole, P C Valery
Indigenous patient navigator (IPN) programmes show promise in addressing barriers to cancer care and facilitation of patient self-efficacy. The purpose of this paper is to describe and reflect upon the experience of training an IPN and implementation of the intervention in the Australian context with Indigenous cancer patients. Randomised clinical trial might provide the best available evaluation measure of an intervention but caution should be taken in the implementation process. Socio-cultural aspects and training can affect the conduct of this type of intervention...
May 17, 2017: European Journal of Cancer Care
https://www.readbyqxmd.com/read/28505597/an-interpenetrating-network-strengthened-and-toughened-hydrogel-that-supports-cell-based-nucleus-pulposus-regeneration
#10
Yibo Gan, Pei Li, Liyuan Wang, Xiumei Mo, Lei Song, Yuan Xu, Chen Zhao, Bin Ouyang, Bing Tu, Lei Luo, Linyong Zhu, Shiwu Dong, Fuyou Li, Qiang Zhou
Hydrogel is a suitable scaffold for the nucleus pulposus (NP) regeneration. However, its unmatched mechanical properties lead to implant failure in late-stage disc degeneration because of structural failure and implant extrusion after long-term compression. In this study, we evaluated an interpenetrating network (IPN)-strengthened and toughened hydrogel for NP regeneration, using dextran and gelatin as the primary network while poly (ethylene glycol) as the secondary network. The aim of this study was to realize the NP regeneration using the hydrogel...
May 10, 2017: Biomaterials
https://www.readbyqxmd.com/read/28479343/oral-dna-vaccines-based-on-cs-tpp-nanoparticles-and-alginate-microparticles-confer-high-protection-against-infectious-pancreatic-necrosis-virus-ipnv-infection-in-trout
#11
Sohrab Ahmadivand, Mehdi Soltani, Mahdi Behdani, Øystein Evensen, Ehsan Alirahimi, Reza Hassanzadeh, Ellahe Soltani
Infectious pancreatic necrosis virus (IPNV) is the etiological agent of a contagious viral disease causing remarkable mortalities in different fish species. Despite the availability of commercial vaccines against IPN, the disease still constitutes one of the main threats to the aquaculture industry worldwide. In this study, we developed a DNA vaccine encoding the VP2 gene of IPNV and evaluated its ability to induce protective immunity in rainbow trout fry (3 g) at doses of 10 and 25 μg/fish and boosting with the same doses two weeks later through the oral route using chitosan/tripolyphosphate (CS-TPP) nanoparticles and alginate microparticles incorporated into fish feed...
May 4, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28476961/poly-vinyl-alcohol-poly-acrylamide-co-diallyldimethyl-ammonium-chloride-semi-ipn-hydrogels-for-ciprofloxacin-hydrochloride-drug-delivery
#12
Siva Sankar Sana, Vijaya Kumar Naidu Boya
Herein, the authors developed a new and potential semi-interpenetrating polymer network (semi-IPN) hydrogels of poly vinyl alcohol (PVA), acryl amide and diallyldimethyl ammonium chloride employing chemical cross-linker N, N'-methylene bisacrylamide (NNMBA) and ammonium persulphate as an initiator by radical polymerisation. To analyse the copolymer formation between two monomers and IPN cross-linking reaction, the resulting hydrogel was characterised by Fourier transform infrared spectroscopy and the surface morphology was analysed using scanning electron microscopy...
February 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28456644/chitosan-locust-bean-gum-interpenetrating-polymeric-network-nanocomposites-for-delivery-of-aceclofenac
#13
Sougata Jana, Kalyan Kumar Sen
In this study, aceclofenac-loaded IPN nanocomposites were developed based on natural polysaccharides namely chitosan (CS) and locust bean gum (LBG) using glutaraldehyde as cross-linker. Infrared spectroscopy analysis confirmed the formation of composite materials and ensured the chemical compatibility between drug and polymers. The effect of component polymers on the drug entrapment efficiency (DEE) and particle size of the composites was examined. Increasing LBG content actually decreased the DEE from 72% to 40% and produced larger particles of 372-485nm dimensions...
April 26, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28450244/radiation-synthesis-and-drug-delivery-properties-of-interpenetrating-networks-ipns-based-on-poly-vinyl-alcohol-methylcellulose-blend-hydrogels
#14
Abdel Wahab M El-Naggar, Magdy M Senna, Tahia A Mostafa, Reham H Helal
Gamma radiation was used to prepare blend hydrogels from poly(vinyl alcohol) (PVA) and low ratios of methylcellulose (MC). The structure-property behavior was characterized by IR spectroscopy, gel fraction, differential scanning calorimetry (DSC) and swelling at room temperature and different pH values. The PVA/MC hydrogels were used as a carrier for doxycycline hyclate (DOX-h) drug. The results showed that the gel fraction of PVA/MC hydrogels decreased greatly with increasing the ratio of MC in the initial feeding solution...
April 25, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28438665/effective-connectivity-gateways-to-the-theory-of-mind-network-in-processing-communicative-intention
#15
Marco Tettamanti, Matilde M Vaghi, Bruno G Bara, Stefano F Cappa, Ivan Enrici, Mauro Adenzato
An Intention Processing Network (IPN), involving the medial prefrontal cortex, precuneus, bilateral posterior superior temporal sulcus, and temporoparietal junctions, plays a fundamental role in comprehending intentions underlying action goals. In a previous fMRI study, we showed that, depending on the linguistic or extralinguistic (gestural) modality used to convey the intention, the IPN is complemented by activation of additional brain areas, reflecting distinct modality-specific input gateways to the IPN...
April 22, 2017: NeuroImage
https://www.readbyqxmd.com/read/28419583/a-comparison-of-multi-factor-scoring-systems-and-single-serum-markers-for-the-early-prediction-of-the-severity-of-acute-pancreatitis
#16
Wen-Hua He, Yin Zhu, Yong Zhu, Qi Jin, Hong-Rong Xu, Zhi-Juan Xion, Min Yu, Liang Xia, Pi Liu, Nong-Hua Lu
BACKGROUND: The purpose of this study was to clarify whether the current scoring systems and single serum markers used in pancreatitis remain applicable for the early prediction of infected pancreatic necrosis (IPN), the severity and mortality of acute pancreatitis (AP) in accordance with the revised Atlanta and determinant-based classifications. METHODS: Demographic, clinical, and laboratory data from 708 consecutive patients with AP were prospectively collected between January 2011 and December 2012...
April 17, 2017: Journal of Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28415489/design-of-salecan-containing-semi-ipn-hydrogel-for-amoxicillin-delivery
#17
Xiaoliang Qi, Wei Wei, Junjian Li, Ting Su, Xihao Pan, Gancheng Zuo, Jianfa Zhang, Wei Dong
Salecan is a new linear extracellular β-glucan. The unique structure and beneficial properties of Salecan makes it an appealing material in biomedical applications. In this work, novel drug devices based on Salecan in a hydrogel matrix of poly(N-(3-dimethylaminopropyl)acrylamide-co-acrylamide) (Salecan/PDA) were fabricated via free radical polymerization for controlled release of amoxicillin. It was demonstrated that amoxicillin was efficiently encapsulated into the developed hydrogels and released in a Salecan dose-dependent and pH-sensitive manner...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415481/modeling-of-drug-release-behavior-of-ph-and-temperature-sensitive-poly-nipaam-co-aac-ipn-hydrogels-using-response-surface-methodology-and-artificial-neural-networks
#18
Sanogo Brahima, Cihangir Boztepe, Asim Kunkul, Mehmet Yuceer
An interpenetrated polymer network (IPN) poly(NIPAAm-co-AAc) hydrogel was synthesized by two polymerization method: emulsion and solution polymerization. The pH- and temperature-sensitive hydrogel was loaded by swelling with riboflavin drug, a B2 vitamin. The release of riboflavin as a function of time has been achieved under different pH and temperature environments. The determination of experimental conditions and the analysis of drug delivery results were achieved using response surface methodology (RSM)...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28411344/the-effect-of-a-novel-minimally-invasive-strategy-for-infected-necrotizing-pancreatitis
#19
Zhihui Tong, Xiao Shen, Lu Ke, Gang Li, Jing Zhou, Yiyuan Pan, Baiqiang Li, Dongliang Yang, Weiqin Li, Jieshou Li
BACKGROUND: Step-up approach consisting of multiple minimally invasive techniques has gradually become the mainstream for managing infected pancreatic necrosis (IPN). In the present study, we aimed to compare the safety and efficacy of a novel four-step approach and the conventional approach in managing IPN. METHODS: According to the treatment strategy, consecutive patients fulfilling the inclusion criteria were put into two time intervals to conduct a before-and-after comparison: the conventional group (2010-2011) and the novel four-step group (2012-2013)...
April 14, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28385222/alginate-polyvinyl-alcohol-based-interpenetrating-polymer-network-for-prolonged-drug-therapy-optimization-and-in-vitro-characterization
#20
Hina Anwar, Mahmood Ahmad, Muhammad Usman Minhas, Sahrish Rehmani
A new natural and synthetic polymeric blend to form interpenetrating polymer network (IPN) hydrogels was synthesized utilizing sodium alginate and PVA as polymers by free radical polymerization employing 2-Acylamido-2-methylpropane-sulfonic acid as monomer (AMPS) and tramadol HCl as model drug through 3(2) level full factorial design to evaluate the impact of selected independent factors i.e. polymer (sodium alginate) and monomer (AMPS) contents on swelling index at 18th hour, percent drug release at 18th hour, time required for 80% drug release and drug entrapment efficiency as dependent variables...
June 15, 2017: Carbohydrate Polymers
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