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https://www.readbyqxmd.com/read/29777854/dissolving-polymeric-microneedle-arrays-for-enhanced-site-specific-acyclovir-delivery
#1
Boonnada Pamornpathomkul, Tanasait Ngawhirunpat, Ismaiel A Tekko, Lalitkumar Vora, Helen O McCarthy, Ryan F Donnelly
Acyclovir is widely indicated for the treatment of herpes labialis (cold sores), typically caused by the herpes simplex virus type 1 (HSV-1). However, topical acyclovir has poor efficacy, due to its low skin permeability. The purpose of this study was, therefore, to evaluate the ability of dissolving polymeric microneedle (MN) arrays to improve the local delivery of acyclovir. Acyclovir-loaded dissolving MN arrays (0.49 cm2 ) were formulated from aqueous blends of Gantrez® S-97 with 361 needles per array (589 ± 9...
May 16, 2018: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29775714/novel-bletilla-striata-polysaccharide-microneedles-fabrication-characterization-and-in-vitro-transcutaneous-drug-delivery
#2
Lingli Hu, Zhencheng Liao, Qiqi Hu, Katherine G Maffucci, Yan Qu
Dissolving microneedles (MNs) have been widely studied for their applications in effective transdermal drug delivery due to their ability to dissolve within the skin. This study details the first reported successful preparation of novel dissolving MNs using Bletilla striata polysaccharide (BSP), a natural glucomannan material, and investigates the potential for using such MNs as a transdermal drug delivery vector. The prepared dissolving Bletilla striata polysaccharide microneedles (BMNs) had excellent moldability and were easily detached from the mold...
May 15, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29768404/tissue-specific-activities-of-the-fat1-cadherin-cooperate-to-control-neuromuscular-morphogenesis
#3
Françoise Helmbacher
Muscle morphogenesis is tightly coupled with that of motor neurons (MNs). Both MNs and muscle progenitors simultaneously explore the surrounding tissues while exchanging reciprocal signals to tune their behaviors. We previously identified the Fat1 cadherin as a regulator of muscle morphogenesis and showed that it is required in the myogenic lineage to control the polarity of progenitor migration. To expand our knowledge on how Fat1 exerts its tissue-morphogenesis regulator activity, we dissected its functions by tissue-specific genetic ablation...
May 16, 2018: PLoS Biology
https://www.readbyqxmd.com/read/29767748/glial-activation-and-central-synapse-loss-but-not-motoneuron-degeneration-are-prevented-by-the-sigma-1-receptor-agonist-pre-084-in-the-smn2b-mouse-model-of-spinal-muscular-atrophy
#4
Clàudia Cerveró, Alba Blasco, Olga Tarabal, Anna Casanovas, Lídia Piedrafita, Xavier Navarro, Josep E Esquerda, Jordi Calderó
Spinal muscular atrophy (SMA) is characterized by the loss of α-motoneurons (MNs) with concomitant muscle denervation. MN excitability and vulnerability to disease are particularly regulated by cholinergic synaptic afferents (C-boutons), in which Sigma-1 receptor (Sig1R) is concentrated. Alterations in Sig1R have been associated with MN degeneration. Here, we investigated whether a chronic treatment with the Sig1R agonist PRE-084 was able to exert beneficial effects on SMA. We used a model of intermediate SMA, the Smn2B/- mouse, in which we performed a detailed characterization of the histopathological changes that occur throughout the disease...
May 14, 2018: Journal of Neuropathology and Experimental Neurology
https://www.readbyqxmd.com/read/29765638/porous-polymer-coatings-on-metal-microneedles-for-enhanced-drug-delivery
#5
Asad Ullah, Chul Min Kim, Gyu Man Kim
We present a simple method to coat microneedles (MNs) uniformly with a porous polymer (PLGA) that can deliver drugs at high rates. Stainless steel (SS) MNs of high mechanical strength were coated with a thin porous polymer layer to enhance their delivery rates. Additionally, to improve the interfacial adhesion between the polymer and MNs, the MN surface was modified by plasma treatment followed by dip coating with polyethyleneimine, a polymer with repeating amine units. The average failure load (the minimum force sufficient for detaching the polymer layer from the surface of SS) recorded for the modified surface coating was 25 N, whereas it was 2...
April 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29758654/localization-of-multilayer-networks-by-optimized-single-layer-rewiring
#6
Sarika Jalan, Priodyuti Pradhan
We study localization properties of principal eigenvectors (PEVs) of multilayer networks (MNs). Starting with a multilayer network corresponding to a delocalized PEV, we rewire the network edges using an optimization technique such that the PEV of the rewired multilayer network becomes more localized. The framework allows us to scrutinize structural and spectral properties of the networks at various localization points during the rewiring process. We show that rewiring only one layer is enough to attain a MN having a highly localized PEV...
April 2018: Physical Review. E
https://www.readbyqxmd.com/read/29752714/post-crossing-segment-of-di1-commissural-axons-forms-collateral-branches-to-motor-neurons-in-the-developing-spinal-cord
#7
Takeshi Kaneyama, Ryuichi Shirasaki
The dI1 commissural axons in the developing spinal cord, upon crossing the midline through the floor plate, make a sharp turn to grow rostrally. These post-crossing axons initially just extend adjacent to the floor plate without entering nearby motor columns. However, it remains poorly characterized how these post-crossing dI1 axons behave subsequently to this process. In the present study, to address this issue, we examined in detail the behavior of post-crossing dI1 axons in mice, using the Atoh1 enhancer-based conditional expression system that enables selective and sparse labeling of individual dI1 axons, together with Hb9 and ChAT immunohistochemistry for precise identification of spinal motor neurons (MNs)...
May 11, 2018: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/29748539/sirt1-activation-with-neuroheal-is-neuroprotective-but-sirt2-inhibition-with-ak7-is-detrimental-for-disconnected-motoneurons
#8
David Romeo-Guitart, Tatiana Leiva-Rodríguez, María Espinosa-Alcantud, Núria Sima, Alejandro Vaquero, Helena Domínguez-Martín, Diego Ruano, Caty Casas
Sirtuin 1 (SIRT1) activity is neuroprotective, and we have recently demonstrated its role in the retrograde degenerative process in motoneurons (MNs) in the spinal cord of rats after peripheral nerve root avulsion (RA) injury. SIRT2 has been suggested to exert effects opposite those of SIRT1; however, its roles in neurodegeneration and neuron response after nerve injury remain unclear. Here we compared the neuroprotective potentials of SIRT1 activation and SIRT2 inhibition in a mouse model of hypoglossal nerve axotomy...
May 10, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29745016/fabrication-of-a-3d-hierarchical-sandwich-co-9-s-8-%C3%AE-mns-n-c-mos-2-nanowire-architectures-as-advanced-electrode-material-for-high-performance-hybrid-supercapacitors
#9
Syam Kandula, Khem Raj Shrestha, Nam Hoon Kim, Joong Hee Lee
Supercapacitors suffer from lack of energy density and impulse the energy density limit, so a new class of hybrid electrode materials with promising architectures is strongly desirable. Here, the rational design of a 3D hierarchical sandwich Co9 S8 /α-MnS@N-C@MoS2 nanowire architecture is achieved during the hydrothermal sulphurization reaction by the conversion of binary mesoporous metal oxide core to corresponding individual metal sulphides core along with the formation of outer metal sulphide shell at the same time...
May 10, 2018: Small
https://www.readbyqxmd.com/read/29722946/-correlation-of-serum-anti-m%C3%A3-llerian-hormone-with-semen-parameters
#10
Long-Ping Peng, Yong Shao, Cen-Cen Wang, Zhi-Chuan Zou, Tao Shen, Li Chen, Bing Yao
Objective: To investigate the relationship between the serum anti-Müllerian hormone (AMH) level and semen parameters. METHODS: We collected the data about 726 outpatients at the Male Infertility Clinic of Jinling Hospital from September 2015 to November 2016, including 72 with non-obstructive azoospermia, 123 with oligospermia, and 531 with normal sperm concentration. We obtained the semen volume, total sperm count, sperm concentration, sperm motility, the percentages of progressively motile sperm (PMS) and morphologically normal sperm (MNS), and the levels of serum AMH, inhibin B (INH-B), total testosterone (TT) and follicle - stimulating hormone (FSH) of the patients, analyzed the correlation of the serum AMH level with the other parameters, and compared the AMH level among different groups...
June 2017: Zhonghua Nan Ke Xue, National Journal of Andrology
https://www.readbyqxmd.com/read/29722857/procedural-and-long-term-outcome-after-catheter-ablation-of-idiopathic-outflow-tract-ventricular-arrhythmias-comparing-manual-contact-force-and-magnetic-navigated-ablation
#11
Lennart J de Vries, Astrid A Hendriks, Sing C Yap, Dominic A M J Theuns, Ron T van Domburg, Tamas Szili-Torok
Aims: Currently, comparative data on procedural and long-term clinical outcome of outflow tract (OT) idiopathic ventricular arrhythmia (IVA) ablation with manual (MAN), contact force (CF), and magnetic navigation system (MNS) ablation are lacking. The aim of this study was to compare the procedural and long-term clinical outcome of MAN, CF, and MNS ablation of OT IVAs. Methods and results: Seventy-three patients (31 MAN, 17 CF, and 25 MNS patients; consecutive per group) with OT IVA, who underwent catheter ablation in our centre were analysed...
May 1, 2018: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/29722090/controlled-delivery-of-insulin-using-rapidly-separating-microneedles-fabricated-from-genipin-crosslinked-gelatin
#12
Bo Zhi Chen, Mohammad Ashfaq, Dan Dan Zhu, Xiao Peng Zhang, Xin Dong Guo
Rapidly separating genepin-crosslinked gelatin (RS-GC) microneedles (MNs) mounted on the polyvinyl alcohol (PVA)-coated polylactic acid (PLA) MNs (RS-PGC-MNs) are fabricated, in which GC-MNs deliver insulin within the skin and the PLA supporting array is easily separated by the dissolution of the PVA layer. The release of insulin is controlled by utilizing the virtue of genipin as a crosslinking agent for producing biocompatible GC-MNs. The degree of crosslinking enhances the mechanical strength as well as humidity resistance...
May 2, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29718808/differences-in-lumbar-motor-neuron-pruning-in-an-animal-model-of-early-onset-spasticity
#13
Joline E Brandenburg, Heather M Gransee, Matthew J Fogarty, Gary C Sieck
Motor neuron (MN) development in early onset spasticity is poorly understood. For example, spastic cerebral palsy (sCP), the most common motor disability of childhood, is poorly predicted by brain imaging, yet research remains focused on the brain. By contrast, MNs, via the motor unit and neurotransmitter signaling, are the target of most therapeutic spasticity treatments and are the final common output of motor control. MN development in sCP is a critical knowledge gap as the late embryonic and postnatal periods are not only when the supposed brain injury occurs, but are critical times for spinal cord neuromotor development...
May 2, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29715041/a-generic-and-scalable-method-for-the-preparation-of-monodispersed-metal-sulfide-nanocrystals-with-tunable-optical-properties
#14
Abhijit Bera, Debranjan Mandal, Prasenjit Nanda Goswami, Arup Kumar Rath, Bhagavatula L V Prasad
A rational synthetic method that produces monodisperse and air stable metal sulfide colloidal quantum dots (CQDs) in organic nonpolar solvents using octyl dithiocarbamic acid (C8DTCA) as a sulfur source, is reported. The high reactivity of C8DTCA in presence of primary amines towards metal complexes is exploited to achieve this purpose. This novel technique is generic and can be applied to prepare diverse CQDs, like CdS, MnS, ZnS, SnS, In2S3, including more useful and in demand PbS CQDs and plasmonic nanocrystals of Cu2S...
May 1, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29713861/the-increasing-importance-of-environmental-conditions-in-amyotrophic-lateral-sclerosis
#15
REVIEW
Javier Riancho, Pilar Bosque-Varela, Sara Perez-Pereda, Mónica Povedano, Adolfo López de Munaín, Ana Santurtun
Amyotrophic lateral sclerosis (ALS) is the most common neurodegenerative disease affecting motor neurons (MNs). Although a small percentage of ALS has a familial origin, the vast majority of cases are sporadic in which genetic factors and environment interact with each other leading to disease onset in genetically predisposed individuals. In the current model of the disease, each individual has a determined genetic load, some degree of cell degeneration related to age and several risky environmental exposures...
April 30, 2018: International Journal of Biometeorology
https://www.readbyqxmd.com/read/29707783/high-immunogenicity-of-red-blood-cell-antigens-restricted-to-the-population-of-african-descent-in-a-cohort-of-sickle-cell-disease-patients
#16
Aline Floch, Dominique Gien, Christophe Tournamille, Btissam Chami, Anoosha Habibi, Frédéric Galactéros, Philippe Bierling, Rachid Djoudi, Corinne Pondarré, Thierry Peyrard, France Pirenne
BACKGROUND: Sickle cell disease (SCD) patients undergo multiple red blood cell (RBC) transfusions and are regularly exposed to low-prevalence (LP) antigens specific to individuals of African descent. This study evaluated the prevalence of antibodies against LP antigens in SCD patients and the need to identify these antibodies in everyday practice. STUDY DESIGN AND METHODS: Plasma from 211 SCD patients was tested with RBCs expressing the following LP antigens: RH10 (V), RH20 (VS), RH23 (DW ), RH30 (Goa ), KEL6 (Jsa ), and MNS6 (He)...
April 29, 2018: Transfusion
https://www.readbyqxmd.com/read/29660445/development-of-a-new-tool-for-the-long-term-in-vitro-ecotoxicity-testing-of-nanomaterials-using-a-rainbow-trout-cell-line-rtl-w1
#17
L Galbis-Martínez, M L Fernández-Cruz, L Alte, A Valdehita, I Rucandio, J M Navas
The current wide use of manufactured nanomaterials (MNs) is leading to the release of nanoparticles (NPs) to water bodies. Aquatic organisms, including fish, are exposed to low concentrations of NPs for long periods of time being necessary to develop laboratory toxicity tests reflecting realistic conditions. Additionally, today there is a demand of in vitro assays respecting the 3Rs principle. Thus, the main aim of this work was to stablish an in vitro tool for the assessment of long-term NPs ecotoxicity. Considering the key role of liver in detoxification, a rainbow trout liver cell line, RTL-W1, was used...
April 13, 2018: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/29656576/repurposing-carbamazepine-for-the-treatment-of-amyotrophic-lateral-sclerosis-in-sod1-g93a-mouse-model
#18
Jing-Jing Zhang, Qin-Ming Zhou, Sheng Chen, Wei-Dong Le
AIMS: To investigate the effect and mechanisms of carbamazepine (CBZ) on the onset and progression of amyotrophic lateral sclerosis (ALS) in SOD1-G93A mouse model. METHODS: Starting from 64 days of age, SOD1-G93A mice were orally administered with CBZ at 200 mg/kg once daily until death. The disease onset and life span of SOD1-G93A mice were recorded. Motor neurons (MNs) in anterior horn of spinal cord were quantified by Nissl staining and SMI-32 immunostaining...
April 14, 2018: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/29656499/matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-analysis-of-36-blood-group-alleles-among-396-thai-samples-reveals-region-specific-variants
#19
Philaiphon Jongruamklang, Christoph Gassner, Stefan Meyer, Aksarakorn Kummasook, Marion Darlison, Chayanun Boonlum, Surin Chanta, Beat M Frey, Martin L Olsson, Jill R Storry
BACKGROUND: Blood group phenotype variation has been attributed to potential resistance to pathogen invasion. Variation was mapped in blood donors from Lampang (northern region) and Saraburi (central region), Thailand, where malaria is endemic. The previously unknown blood group allele profiles were characterized and the data were correlated with phenotypes. The high incidence of the Vel-negative phenotype previously reported in Thais was investigated. STUDY DESIGN AND METHODS: DNA from 396 blood donors was analyzed by matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry...
April 15, 2018: Transfusion
https://www.readbyqxmd.com/read/29649136/perineuronal-nets-in-spinal-motoneurones-chondroitin-sulphate-proteoglycan-around-alpha-motoneurones
#20
Sian F Irvine, Jessica C F Kwok
Perineuronal nets (PNNs) are extracellular matrix structures surrounding neuronal sub-populations throughout the central nervous system, regulating plasticity. Enzymatically removing PNNs successfully enhances plasticity and thus functional recovery, particularly in spinal cord injury models. While PNNs within various brain regions are well studied, much of the composition and associated populations in the spinal cord is yet unknown. We aim to investigate the populations of PNN neurones involved in this functional motor recovery...
April 12, 2018: International Journal of Molecular Sciences
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