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https://www.readbyqxmd.com/read/28431400/local-delivery-of-hmgb1-in-gelatin-sponge-scaffolds-combined-with-mesenchymal-stem-cell-sheets-to-accelerate-fracture-healing
#1
Deting Xue, Wei Zhang, Erman Chen, Xiang Gao, Ling Liu, Chenyi Ye, Yanbin Tan, Zhijun Pan, Hang Li
Fracture nonunion and delayed union continue to pose challenges for orthopedic surgeons. In the present study, we combined HMGB1 gelatin sponges with MSC sheets to promote bone healing after surgical treatment of rat tibial fractures. The HMGB1 gelatin sponge scaffolds supported the expansion of mesenchymal stem cells (MSCs) and promoted the osteogenic differentiation of MSCs and MSC sheets. Lentiviral vectors were then used to overexpress HMGB1 in MSCs. The results indicated that HMGB1 promotes the osteogenic differentiation of MSCs through the STAT3 pathway...
April 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/28431361/uncertainty-quantification-and-validation-of-3d-lattice-scaffolds-for-computer-aided-biomedical-applications
#2
Recep M Gorguluarslan, Seung-Kyum Choi, Christopher J Saldana
A methodology is proposed for uncertainty quantification and validation to accurately predict the mechanical response of lattice structures used in the design of scaffolds. Effective structural properties of the scaffolds are characterized using a developed multi-level stochastic upscaling process that propagates the quantified uncertainties at strut level to the lattice structure level. To obtain realistic simulation models for the stochastic upscaling process and minimize the experimental cost, high-resolution finite element models of individual struts were reconstructed from the micro-CT scan images of lattice structures which are fabricated by selective laser melting...
April 12, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28431028/hybrid-de-novo-genome-assembly-of-the-chinese-herbal-fleabane-erigeron-breviscapus
#3
Jing Yang, Guanghui Zhang, Jing Zhang, Hui Liu, Wei Chen, Xiao Wang, Yahe Li, Yang Dong, Shengchao Yang
Background: The plants in the Erigeron genus of the Compositae (Asteraceae) family are commonly called fleabanes, possibly due to the belief that certain chemicals in these plants repel fleas. In the traditional Chinese medicine, Erigeron breviscapus , which is native to China, was widely used in the treatment of cerebrovascular disease. A handful of bioactive compounds, including scutellarin, 3,5-dicaffeoylquinic acid, and 3,4-dicaffeoylquinic acid, have been isolated from the plant...
April 18, 2017: GigaScience
https://www.readbyqxmd.com/read/28431014/the-draft-genome-of-ruellia-speciosa-beautiful-wild-petunia-acanthaceae
#4
Yongbin Zhuang, Erin A Tripp
The genus Ruellia (Wild Petunias; Acanthaceae) is characterized by an enormous diversity of floral shapes and colours manifested among closely related species. Using Illumina platform, we reconstructed the draft genome of Ruellia speciosa, with a scaffold size of 1,021 Mb (or ∼1.02 Gb) and an N50 size of 17,908 bp, spanning ∼93% of the estimated genome (∼1.1 Gb). The draft assembly predicted 40,124 gene models and phylogenetic analyses of four key enzymes involved in anthocyanin colour production [flavanone 3-hydroxylase (F3H), flavonoid 3'-hydroxylase (F3'H), flavonoid 3',5'-hydroxylase (F3'5'H), and dihydroflavonol 4-reductase (DFR)] found that most angiosperms here sampled harboured at least one copy of F3H, F3'H, and DFR...
April 1, 2017: DNA Research: An International Journal for Rapid Publication of Reports on Genes and Genomes
https://www.readbyqxmd.com/read/28430908/late-thrombotic-events-after-bioresorbable-scaffold-implantation-a-systematic-review-and-meta-analysis-of-randomized-clinical-trials
#5
Carlos Collet, Taku Asano, Yosuke Miyazaki, Erhan Tenekecioglu, Yuki Katagiri, Yohei Sotomi, Rafael Cavalcante, Robbert J de Winter, Takeshi Kimura, Runlin Gao, Serban Puricel, Stéphane Cook, Davide Capodanno, Yoshinobu Onuma, Patrick W Serruys
Aims: To compare the long-term safety and efficacy of bioresorbable vascular scaffold (BVS) with everolimus-eluting stent (EES) after percutaneous coronary interventions. Methods and Results: A systematic review and meta-analysis of randomized clinical trials comparing clinical outcomes of patients treated with BVS and EES with at least 24 months follow-up was performed. Adjusted random-effect model by the Knapp-Hartung method was used to compute odds ratios (OR) and 95% confidence intervals (CI)...
April 18, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28430454/accessing-polyoxygenated-dibenzofurans-via-the-union-of-phenols-and-o-benzoquinones-rapid-syntheses-of-metabolites-isolated-from-ribes-takare
#6
Meng Yao Zhang, Russell A Barrow
The construction of polyoxygenated dibenzo[b,d]furan frameworks from the union of substituted phenols/naphthols and o-benzoquinones via a Michael-oxidation-oxa-Michael cascade is reported. The power of this transformation is demonstrated in the generation of a library of highly substituted dibenzofurans, featuring specifically substituted molecules containing broad ranges of functionality. The utility of this method is showcased in the total syntheses of two dibenzofurans isolated from Ribes takare, assembling the carbon scaffold of both natural products in one operation...
April 21, 2017: Organic Letters
https://www.readbyqxmd.com/read/28430441/oxygen-bridged-diphenylnaphthylamine-as-a-scaffold-for-full-color-circularly-polarized-luminescent-materials
#7
Hidetaka Nishimura, Kazuo Tanaka, Yasuhiro Morisaki, Yoshiki Chujo, Atsushi Wakamiya, Yasujiro Murata
An oxygen-bridged diphenylnaphthylamine with a helical shape was designed and synthesized as a key scaffold for circularly polarized luminescent (CPL) materials. The introduction of electron-withdrawing groups, such as formyl and 2,2-dicyanovinyl substituents at the naphthyl moiety in this skeleton effectively decreases the LUMO level and thus allows a tuning of the band-gap. The prepared model compounds exhibit intense CPL signals with a dissymmetry factor (g value) of 10-3 both in CH2Cl2 solutions and in the solid states...
April 21, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28430431/design-synthesis-and-evaluation-of-a-series-of-novel-benzocyclobutene-derivatives-as-general-anesthetics
#8
Chen Zhang, Fangqiong Li, Yan Yu, Anbang Huang, Ping He, Ming Lei, Jianmin Wang, Longbin Huang, Zhenhong Liu, Jianyu Liu, Yonggang Wei
In the present work, a series of structurally novel benzocyclobutene derivatives was identified as general anesthetics through the loss of righting reflex (LORR) experiment on mice. Our initial efforts found compound 1-1 with a fused four-membered ring on the 2,3-position of the phenol ring could significantly improve the safety profile. Further SAR study revealed that small hydrogen bond acceptor (HBA) groups are optimal for good ED50 along with much broader therapeutic windows, such as compounds 16-2 and 17...
April 21, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28430413/bioimaging-with-macromolecular-probes-incorporating-multiple-bodipy-fluorophores
#9
Ek Raj Thapaliya, Yang Zhang, Pravat Dhakal, Adrienne S Brown, James N Wilson, Kevin Collins, Françisco M Raymo
Seven macromolecular constructs incorporating multiple borondipyrromethene (BODIPY) fluorophores along a common poly(methacrylate) backbone with decyl and oligo(ethylene glycol) side chains were synthesized. The hydrophilic oligo(ethylene glycol) components impose solubility in aqueous environment on the overall assembly. The hydrophobic decyl chains insulate effectively the fluorophores from each other to prevent detrimental interchromophoric interactions and preserve their photophysical properties. As a result, the brightness of these multicomponent assemblies is approximately three times greater than that of a model BODIPY monomer...
April 21, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28430394/structure-based-design-of-a-new-scaffold-for-cell-penetrating-peptidic-inhibitors-of-the-histone-demethylase-phf8
#10
Jerzy Dorosz, Lars Olsen, Signe Teuber Seger, Cornelia Steinhauer, Giorgos Bouras, Charlotte Helgstrand, Anders Wiuf, Michael Gajhede
The histone demethylase PHF8 catalyzes demethylation of mono- and di-methylated lysine 9 on histone H3 (H3K9me1/2) and is a transcriptional activator involved in development and cancer. Affinity and specificity of PHF8 towards H3K9me2 substrate is affected by interaction with both the catalytic domain and a PHD reader domain. The latter specifically recognizes tri-methylated lysine 4 on histone H3. A fragment of the histone H3 tail with tri-methylated lysine 4 was used as template for structure based design of a cyclic, cell-penetrating peptide that exhibits micromolar binding affinity to PHF8 in biochemical assays...
April 21, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28430301/towards-a-bioengineered-kidney-recellularization-strategies-for-decellularized-native-kidney-scaffolds
#11
Michele Fedecostante, Oana G Onciu, Koen G C Westphal, Rosalinde Masereeuw
Patients with end-stage renal disease often undergo dialysis as a partial substitute for kidney function while waiting for their only treatment option: a kidney transplant. Several research directions emerged for alternatives in support of the ever-growing numbers of patients. Recent years brought big steps forward in the field, with researchers questioning and improving the current dialysis devices as well as moving towards the design of a bioengineered kidney. Whole-organ engineering is also being explored as a possibility, making use of animal or human kidney scaffolds for engineering a transplantable organ...
April 20, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28430298/an-experimental-numerical-investigation-on-the-effects-of-macroporous-scaffold-geometry-on-cell-culture-parameters
#12
Hadis Eghbali, Michele M Nava, Gabriella Leonardi, Davod Mohebbi-Kalhori, Roberto Sebastiano, Abdolreza Samimi, Manuela T Raimondi
INTRODUCTION: Perfused bioreactors have been demonstrated to be effective in the delivery of nutrients and in the removal of waste products to and from the interior of cell-populated three-dimensional scaffolds. In this paper, a perfused bioreactor hosting a macroporous scaffold provided with a channel is used to investigate transport phenomena and culture parameters on cell growth. METHODS: MG63 human osteosarcoma cells were seeded on macroporous poly​(ε-caprolactone) scaffolds provided with a channel...
April 13, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28430196/organocatalytic-stereoselective-8-2-and-6-4-cycloadditions
#13
Rasmus Mose, Gert Preegel, Jesper Larsen, Sofie Jakobsen, Eva Høgh Iversen, Karl Anker Jørgensen
Cycloadditions that involve more than six π electrons are termed higher-order cycloadditions and are an excellent tool for solving complex synthetic challenges, as they provide direct access to polycyclic scaffolds that contain medium-sized rings. They have interesting synthetic potential for the discovery of new bioactive molecules and in natural product synthesis. It is peculiar that stereocontrolled [8+2] and [6+4] cycloadditions have been largely neglected for the past 50 years. Here we demonstrate a cross-dienamine activation of 2-cyclopentenone and the unprecedented endocyclic linear-dienamine activation of 2-cyclohexenones and 2-cycloheptenones...
May 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28429768/reassembling-embryos-in-vitro-from-component-stem-cells
#14
Caroline Kubaczka, George Q Daley
Researchers at the University of Cambridge, UK have succeeded in reconstructing mouse embryos by combining pluripotent embryonic and multipotent trophoblast stem cells in a 3D scaffold; the study from the laboratory of Professor Zernicka-Goetz, recently published in Science, provides a break-through tool to probe early mammalian development outside the uterus. Achieving a similar feat with human cells might necessitate reconsideration of the 14-day rule as a limitation of such research.
April 21, 2017: Cell Research
https://www.readbyqxmd.com/read/28429412/bone-extracellular-matrix-hydrogel-enhances-osteogenic-differentiation-of-c2c12-myoblasts-and-mouse-primary-calvarial-cells
#15
Noura Alom, Heather Peto, Glen R Kirkham, Kevin M Shakesheff, Lisa J White
Hydrogel scaffolds derived from the extracellular matrix (ECM) of mammalian tissues have been successfully used to promote tissue repair in vitro and in vivo. The objective of this study was to evaluate the osteogenic potential of ECM hydrogels prepared from demineralized and decellularized bovine bone in the presence and absence of osteogenic medium. Culture of C2C12 and mouse primary calvarial cells (mPCs) on decellularized bone ECM (bECM) and demineralized bone matrix (DBM) gels resulted in increased expression of osteogenic gene markers, including a 3...
April 21, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28429182/synthetic-approaches-toward-stilbenes-and-their-related-structures
#16
REVIEW
Zulfiqar Ali Khan, Ahsan Iqbal, Sohail Anjum Shahzad
Compounds belonging to the stilbene family have gained remarkable significance in pharmaceutical as well as material chemistry. The current review covers the various synthetic approaches for the syntheses of stilbene scaffold and related structures over last 30 years. In addition, this review also highlights the role of stilbene intermediates used in the synthesis of important molecules with diverse applications in the field of pharmaceutics and material science.
April 21, 2017: Molecular Diversity
https://www.readbyqxmd.com/read/28429026/n-difluoromethyl-triazole-as-a-constrained-scaffold-in-peptidomimetics
#17
M Mamone, R S B Gonçalves, F Blanchard, G Bernadat, S Ongeri, T Milcent, B Crousse
The N-difluoromethyl triazolo-β-aza-ε-amino acid present in the core of peptides led to constrained conformations due to CH-F and NH-F interactions. Pseudotetrapeptides were obtained in excellent yields directly by click chemistry between azidodifluoroacetamides and alkynes, both linked to an amino acid. This work demonstrates that the N-difluoromethyltriazole scaffold can induce extended structures to β-strand mimics.
April 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28428954/uncovering-the-roles-of-septins-in-cilia
#18
REVIEW
Oliva Palander, Maha El-Zeiry, William S Trimble
Septins are a family of GTP-binding proteins that associate with cellular membranes and the cytoskeleton. Their ability to polymerize into filamentous structures permits them to serve as diffusion barriers for membrane proteins and as multi-molecular scaffolds that recruit components of signaling pathways. At the cellular level, septins contribute to the regulation of numerous processes, including cytokinesis, cell polarity, cell migration, and many others. In this review, we discuss emerging evidence for roles of mammalian septins in the biogenesis and function of flagella and cilia, and how this may impact human diseases such as ciliopathies...
2017: Frontiers in Cell and Developmental Biology
https://www.readbyqxmd.com/read/28428953/tetraspanins-function-as-regulators-of-cellular-signaling
#19
REVIEW
Christina M Termini, Jennifer M Gillette
Tetraspanins are molecular scaffolds that distribute proteins into highly organized microdomains consisting of adhesion, signaling, and adaptor proteins. Many reports have identified interactions between tetraspanins and signaling molecules, finding unique downstream cellular consequences. In this review, we will explore these interactions as well as the specific cellular responses to signal activation, focusing on tetraspanin regulation of adhesion-mediated (integrins/FAK), receptor-mediated (EGFR, TNF-α, c-Met, c-Kit), and intracellular signaling (PKC, PI4K, β-catenin)...
2017: Frontiers in Cell and Developmental Biology
https://www.readbyqxmd.com/read/28428056/recent-development-of-synthetic-nonviral-systems-for-sustained-gene-delivery
#20
REVIEW
Yonggang Xiang, Nwe Nwe Linn Oo, Jin Ping Lee, Zibiao Li, Xian Jun Loh
Sustained gene delivery is of particular importance today because it circumvents the need for repeated therapeutic administration and provides spatial and temporal control of the release profile. Better understanding of the genetic basis of diseases and advances in gene therapy have propelled significant research on biocompatible gene carriers for therapeutic purposes. Varied biodegradable polymer-based architectures have been used to create new compositions with unique properties suitable for sustained gene delivery...
April 17, 2017: Drug Discovery Today
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