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https://www.readbyqxmd.com/read/28942128/vascular-smooth-muscle-cells-derived-from-inbred-swine-induced-pluripotent-stem-cells-for-vascular-tissue-engineering
#1
Jiesi Luo, Lingfeng Qin, Mehmet H Kural, Jonas Schwan, Xia Li, Oscar Bartulos, Xiao-Qiang Cong, Yongming Ren, Liqiong Gui, Guangxin Li, Matthew W Ellis, Peining Li, Darrell N Kotton, Alan Dardik, Jordan S Pober, George Tellides, Marsha Rolle, Stuart Campbell, Robert J Hawley, David H Sachs, Laura E Niklason, Yibing Qyang
Development of autologous tissue-engineered vascular constructs using vascular smooth muscle cells (VSMCs) derived from human induced pluripotent stem cells (iPSCs) holds great potential in treating patients with vascular disease. However, preclinical, large animal iPSC-based cellular and tissue models are required to evaluate safety and efficacy prior to clinical application. Herein, swine iPSC (siPSC) lines were established by introducing doxycycline-inducible reprogramming factors into fetal fibroblasts from a line of inbred Massachusetts General Hospital miniature swine that accept tissue and organ transplants without immunosuppression within the line...
September 19, 2017: Biomaterials
https://www.readbyqxmd.com/read/28941654/soft-tissue-fillers-for-adipose-tissue-regeneration-from-hydrogel-development-toward-clinical-applications
#2
REVIEW
I Van Nieuwenhove, L Tytgat, M Ryx, P Blondeel, F Stillaert, H Thienpont, H Ottevaere, P Dubruel, S Van Vlierberghe
There is a clear and urgent clinical need to develop soft tissue fillers that outperform the materials currently used for adipose tissue reconstruction. Recently, extensive research has been performed within this field of adipose tissue engineering as the commercially available products and the currently existing techniques are concomitant with several disadvantages. Commercial products are highly expensive and associated with an imposing need for repeated injections. Lipofilling or free fat transfer has an unpredictable outcome with respect to cell survivalandpotential resorption of the fat grafts...
September 20, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28938863/identification-of-potential-isoform-selective-histone-deacetylase-inhibitors-for-cancer-therapy-a-combined-approach-of-structure-based-virtual-screening-admet-prediction-and-molecular-dynamics-simulation-assay
#3
Abdullahi Ibrahim Uba, Kemal Yelekçi
Histone deacetylases (HDACs) have gained increased attention as targets for anticancer drug design and development. HDAC inhibitors have proven to be effective for reversing the malignant phenotype in HDAC-dependent cancer cases. However, lack of selectivity of the many HDAC inhibitors in clinical use and trials contributes to toxicities to healthy cells. It is believed that, the continued identification of isoform-selective inhibitors will eliminate these undesirable adverse effects - a task that remains a major challenge to HDAC inhibitor designs...
September 22, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/28938138/continued-sar-exploration-of-1-2-4-thiadiazole-containing-scaffolds-in%C3%A2-the-design-of-free-fatty-acid-receptor-1-gpr40-agonists
#4
Mikhail Krasavin, Alexei Lukin, Anna Bakholdina, Nikolay Zhurilo, Oleksandra Onopchenko, Petro Borysko, Sergey Zozulya, Daniel Moore, Irina G Tikhonova
An earlier reported series of 1,2,4-thiadiazole-based agonists of FFA1 (GPR40) was evolved into two structurally distinct series of compounds. One of the series (structurally related to known FFA1 agonist GW9508) displayed low micromolar potency while the other (representing a truncated version of the earlier reported potent FFA1 agonists) was, surprisingly, found to be devoid of agonist potency. In silico docking of representative compounds into the crystal structure of FFA1 revealed possible structural grounds for the observed SAR...
September 13, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28937754/bi-functional-elastin-like-polypeptide-nanoparticles-bind-rapamycin-and-integrins-and-suppress-tumor-growth-in-vivo
#5
Jugal P Dhandhukia, Pu Shi, Santosh Peddi, Zhe Li, Suhaas Rayudu Aluri, Yaping Ju, Dab Brill, Wan Wang, Siti Janib, Yi-An Lin, Shuanglong Liu, Honggang Cui, John Andrew MacKay
Recombinant protein-polymer scaffolds such as Elastin-Like Polypeptides (ELPs) offer drug delivery opportunities including biocompatibility, monodispersity, and multi-functionality. We recently reported that fusion of FK-506 binding protein 12 (FKBP) to an ELP nanoparticle (FSI) increases rapamycin (Rapa) solubility, suppresses growth of breast cancer xenografts, and reduces side-effects observed with free drug controls. This new report significantly advances this carrier strategy by demonstrating the co-assembly of two different ELP diblock copolymers containing drug-loading and tumor-targeting domains...
September 22, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28930674/a-protein-scaffold-coordinates-src-mediated-jnk-activation-in-response-to-metabolic-stress
#6
Shashi Kant, Claire L Standen, Caroline Morel, Dae Young Jung, Jason K Kim, Wojciech Swat, Richard A Flavell, Roger J Davis
Obesity is a major risk factor for the development of metabolic syndrome and type 2 diabetes. How obesity contributes to metabolic syndrome is unclear. Free fatty acid (FFA) activation of a non-receptor tyrosine kinase (SRC)-dependent cJun NH2-terminal kinase (JNK) signaling pathway is implicated in this process. However, the mechanism that mediates SRC-dependent JNK activation is unclear. Here, we identify a role for the scaffold protein JIP1 in SRC-dependent JNK activation. SRC phosphorylation of JIP1 creates phosphotyrosine interaction motifs that bind the SH2 domains of SRC and the guanine nucleotide exchange factor VAV...
September 19, 2017: Cell Reports
https://www.readbyqxmd.com/read/28925552/in-situ-bone-tissue-engineering-with-an-endogenous-stem-cell-mobilizer-and-osteoinductive-nanofibrous-polymeric-scaffolds
#7
Jong Seung Lee, Yoonhee Jin, Hyun-Ji Park, Kisuk Yang, Min Suk Lee, Hee Seok Yang, Seung-Woo Cho
Classical bone tissue engineering involves the use of culture-expanded cells and scaffolds to produce tissue constructs for transplantation. Despite promising results, clinical adoption of these constructs has been limited due to various drawbacks, including extensive cell expansion steps, low cell survival rate upon transplantation, and the possibility of immuno-rejection. To bypass the ex vivo cell culture and transplantation process, we exploited the regenerative capacity of the host by mobilizing endogenous stem cells to the site of injury...
September 19, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28921421/tissue-engineering-of-3d-organotypic-microtissues-by-acoustic-assembly
#8
Yuqing Zhu, Vahid Serpooshan, Sean Wu, Utkan Demirci, Pu Chen, Sinan Güven
There is a rapidly growing interest in generation of 3D organotypic microtissues with human physiologically relevant structure, function, and cell population in a wide range of applications including drug screening, in vitro physiological/pathological models, and regenerative medicine. Here, we provide a detailed procedure to generate structurally defined 3D organotypic microtissues from cells or cell spheroids using acoustic waves as a biocompatible and scaffold-free tissue engineering tool.
September 19, 2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28905618/functionalization-of-reduced-graphene-oxide-via-thiol-maleimide-click-chemistry-facile-fabrication-of-targeted-drug-delivery-vehicles
#9
Yavuz Oz, Alexandre Barras, Rana Sanyal, Rabah Boukherroub, Sabine Szunerits, Amitav Sanyal
Materials based on reduced graphene oxide (rGO) have shown to be amenable to noncovalent functionalization through hydrophobic interactions. The scaffold, however, does not provide sufficient covalent linkage given the low number of reactive carboxyl and alcohol groups typically available on the rGO. The integration of clickable groups, particularly the ones that can undergo efficient conjugation without any metal catalyst, would allow facile functionalization of these materials. This study reports on the noncovalent association of a maleimide-containing catechol (dopa-MAL) surface anchor onto the rGO...
September 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28894598/mechanical-behavior-of-polymer-based-vs-metallic-based-bioresorbable-stents
#10
REVIEW
Hui Ying Ang, Ying Ying Huang, Soo Teik Lim, Philip Wong, Michael Joner, Nicolas Foin
Bioresorbable scaffolds (BRS) were developed to overcome the drawbacks of current metallic drug-eluting stents (DES), such as late in-stent restenosis and caging of the vessel permanently. The concept of the BRS is to provide transient support to the vessel during healing before being degraded and resorbed by the body, freeing the vessel and restoring vasomotion. The mechanical properties of the BRS are influenced by the choice of the material and processing methods. Due to insufficient radial strength of the bioresorbable material, BRS often required large strut profile as compared to conventional metallic DES...
August 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28893770/serial-5-year-evaluation-of-side-branches-jailed-by-bioresorbable-vascular-scaffolds-using-3-dimensional-optical-coherence-tomography-insights-from-the-absorb-cohort-b-trial-a-clinical-evaluation-of-the-bioabsorbable-everolimus-eluting-coronary-stent-system
#11
Yoshinobu Onuma, Maik J Grundeken, Shimpei Nakatani, Taku Asano, Yohei Sotomi, Nicolas Foin, Jaryl Ng, Takayuki Okamura, Joanna J Wykrzykowska, Robbert J de Winter, Robert-Jan van Geuns, Jacques Koolen, Evald Christiansen, Robert Whitbourn, Dougal McClean, Pieter Smits, Stephan Windecker, John A Ormiston, Patrick W Serruys
BACKGROUND: The long-term fate of Absorb bioresorbable vascular scaffold (Abbott Vascular, Santa Clara, CA) struts jailing side branch ostia has not been clarified. We therefore evaluate serially (post-procedure and at 6 months, 1, 2, 3, and 5 years) the appearance and fate of jailed Absorb bioresorbable vascular scaffold struts. METHODS AND RESULTS: We performed 3-dimensional optical coherence tomographic analysis of the ABSORB Cohort B trial (A Clinical Evaluation of the Bioabsorbable Everolimus Eluting Coronary Stent System in the Treatment of Patients With De Novo Native Coronary Artery Lesions) up to 5 years using a novel, validated cut-plane analysis method...
September 2017: Circulation. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28892654/single-stage-cartilage-repair-using-platelet-rich-fibrin-scaffolds-with-autologous-cartilaginous-grafts
#12
Chin-Chean Wong, Chih-Hwa Chen, Wing P Chan, Li-Hsuan Chiu, Wei-Pin Ho, Fon-Jou Hsieh, You-Tzung Chen, Tsung-Lin Yang
BACKGROUND: To avoid complicated procedures requiring in vitro chondrocyte expansion for cartilage repair, the development of a culture-free, 1-stage approach combining platelet-rich fibrin (PRF) and autologous cartilage grafts may be the solution. PURPOSE: To develop a feasible 1-step procedure to combine PRF and autologous cartilage grafts for articular chondral defects. STUDY DESIGN: Controlled laboratory study Methods: The chemotactic effects of PRF on chondrocytes harvested from the primary culture of rabbit cartilage were evaluated in vitro and ex vivo...
September 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28892571/regenerative-immunology-the-immunological-reaction-to-biomaterials
#13
Paolo Cravedi, Samira Farouk, Andrea Angeletti, Lauren Edgar, Riccardo Tamburrini, Jerome Dusuit, Laura Perin, Giuseppe Orlando
Regenerative medicine promises to meet two of the most urgent needs of modern organ transplantation, namely immunosuppression-free transplantation and an inexhaustible source of organs. Ideally, bioengineered organs would be manufactured from a patient's own biomaterials-both cells and the supporting scaffolding materials in which cells would be embedded and allowed to mature to eventually regenerate the organ in question. While some groups are focusing on the feasibility of this approach, few are focusing on the immunogenicity of the scaffolds that are being developed for organ bioengineering purposes...
September 11, 2017: Transplant International: Official Journal of the European Society for Organ Transplantation
https://www.readbyqxmd.com/read/28891570/n-heterocyclic-carbene-palladium-catalyzed-cascade-annulation-alkynylation-of-2-alkynylanilines-with-terminal-alkynes
#14
Jianxiao Li, Can Li, Lu Ouyang, Chunsheng Li, Wanqing Wu, Huanfeng Jiang
A straightforward and highly effective N-heterocyclic carbene-palladium catalyzed cascade annulation/alkynylation of 2-alkynylanilines with terminal alkynes has been enabled to afford free (NH)-3-alkynylindole derivatives in moderate to good yields. This protocol features mild conditions, broad substrate scope, and high atom- and step-economy. Notably, the resultant 3-alkynylindoles could be conveniently transformed into a variety of functionalized indole scaffolds, thus illustrating their potential applications in synthetic and pharmaceutical chemistry...
September 11, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28890318/total-biosynthesis-of-the-pyrrolo-4-2-benzodiazepine-scaffold-tomaymycin-on-an-in%C3%A2-vitro-reconstituted-nrps-system
#15
Alexander von Tesmar, Michael Hoffmann, Jan Pippel, Antoine Abou Fayad, Stefan Dausend-Werner, Armin Bauer, Wulf Blankenfeldt, Rolf Müller
In vitro reconstitution and biochemical analysis of natural product biosynthetic pathways remains a challenging endeavor, especially if megaenzymes of the nonribosomal peptide synthetase (NRPS) type are involved. In theory, all biosynthetic steps may be deciphered using mass spectrometry (MS)-based analyses of both the carrier protein-coupled intermediates and the free intermediates. We here report the "total biosynthesis" of the pyrrolo[4,2]benzodiazepine scaffold tomaymycin using an in vitro reconstituted NRPS system...
August 24, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/28888984/cannabidiol-a-novel-inverse-agonist-for-gpr12
#16
Kevin J Brown, Alyssa S Laun, Zhao-Hui Song
GPR12 is a constitutively active, Gs protein-coupled receptor that currently has no confirmed endogenous ligands. GPR12 may be involved in physiological processes such as maintenance of oocyte meiotic arrest and brain development, as well as pathological conditions such as metastatic cancer. In this study, the potential effects of various classes of cannabinoids on GPR12 were tested using a cAMP accumulation assay. Our data demonstrate that cannabidiol (CBD), a major non-psychoactive phytocannabinoid, acted as an inverse agonist to inhibit cAMP accumulation stimulated by the constitutively active GPR12...
September 6, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28888665/fish-scale-derived-collagen-patch-promotes-growth-of-blood-and-lymphatic-vessels-in-vivo
#17
Jun Kit Wang, Kim Pin Yeo, Yong Yao Chun, Timothy Thatt Yang Tan, Nguan Soon Tan, Véronique Angeli, Cleo Choong
In this study, Type I collagen was extracted from fish scales as a potential alternative source of collagen for tissue engineering applications. Since unmodified collagen typically has poor mechanical and degradation stability both in vitro and in vivo, additional methylation modification and 1,4-butanediol diglycidyl ether (BDE) crosslinking steps were used to improve the physicochemical properties of fish scale-derived collagen. Subsequently, in vivo studies using a murine model demonstrated the biocompatibility of the different fish scale-derived collagen patches...
September 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28885854/phenoxazine-a-privileged-scaffold-for-radical-trapping-antioxidants
#18
Luke A Farmer, Evan A Haidasz, Markus Griesser, Derek A Pratt
Diphenylamines are widely used to protect petroleum-derived products from autoxidation. Their efficacy as radical-trapping antioxidants (RTAs) relies on a balance of fast H-atom transfer kinetics and stability to one electron oxidation by peroxidic species. Both H-atom transfer and one-electron oxidation are enhanced by substitution with electron-donating substituents, such as the S-atom in phenothiazines, another important class of RTA. Herein we report the results of our investigations of the RTA activity of the structurally-related, but essentially ignored, phenoxazines...
September 8, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28885738/wearable-large-scale-perovskite-solar-power-source-via-nanocellular-scaffold
#19
Xiaotian Hu, Zengqi Huang, Xue Zhou, Pengwei Li, Yang Wang, Zhandong Huang, Meng Su, Wanjie Ren, Fengyu Li, Mingzhu Li, Yiwang Chen, Yanlin Song
Dramatic advances in perovskite solar cells (PSCs) and the blossoming of wearable electronics have triggered tremendous demands for flexible solar-power sources. However, the fracturing of functional crystalline films and transmittance wastage from flexible substrates are critical challenges to approaching the high-performance PSCs with flexural endurance. In this work, a nanocellular scaffold is introduced to architect a mechanics buffer layer and optics resonant cavity. The nanocellular scaffold releases mechanical stresses during flexural experiences and significantly improves the crystalline quality of the perovskite films...
September 8, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28883507/organotypic-pancreatoids-with-native-mesenchyme-develop-insulin-producing-endocrine-cells
#20
Marissa A Scavuzzo, Diane Yang, Malgorzata Borowiak
Replacement of lost beta cells in patients with diabetes has the potential to alleviate them of their disease, yet current protocols to make beta cells are inadequate for therapy. In vitro screens can reveal the signals necessary for endocrine maturation to improve beta cell production, however the complexities of in vivo development that lead to beta cell formation are lost in two-dimensional systems. Here, we create three-dimensional organotypic pancreatic cultures, named pancreatoids, composed of embryonic day 10...
September 7, 2017: Scientific Reports
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