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https://www.readbyqxmd.com/read/29792924/creation-of-an-acellular-vaginal-matrix-for-potential-vaginal-augmentation-and-cloacal-repair
#1
K V Greco, L G Jones, I Obiri-Yeboa, T Ansari
STUDY OBJECTIVE: our aim was to use porcine vagina to create a vaginal matrix and test its cellular biocompatibility. DESIGN: vagina was harvested from pigs and de-cellularised (DC) using a combination of detergents (Triton x-100 and sodium deoxycholate) and enzymes (DNAse/RNAse). INTERVENTIONS: the presence of cellular material, collagen structural integrity and basement membrane proteins were assessed histologically. To address cytocompatibility, porcine adipose derived-mesenchymal stem cells (AD-MSC) were harvested from abdominal fat together with vaginal epithelial cells (VEC) and seeded onto the mucosal aspect of the vaginal scaffold...
May 21, 2018: Journal of Pediatric and Adolescent Gynecology
https://www.readbyqxmd.com/read/29792891/pcl-eug-scaffolds-with-tunable-stiffness-can-regulate-macrophage-secretion-behavior
#2
REVIEW
Y Z B Xue, Yiming Niu, B Tang, C M Wang
Osteoarthritis (OA) is a prevalent joint disorder worldwide. Recent studies suggested that macrophages play an important role in the progression of OA. However, the detailed pathology related to macrophages is still ambiguous, especially those related to mechanotransduction. In this study, PCL/EUG composite scaffolds were first fabricated by electrospinning. The stiffness of as-fabricated scaffolds was controlled by adjusting the PCL-versus-EUG ratio. The mechanical properties, structural characterics and chemical composition of the scaffolds were investigated using various materials characterization techniques...
May 21, 2018: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/29792795/tuning-the-morphology-of-nanostructured-peptide-films-by-introduction-of-a-secondary-structure-conformational-constraint-a-case-study-of-hierarchical-self-assembly
#3
Marta De Zotti, Beatrice Muzzi, Emanuela Gatto, Benedetta Di Napoli, Claudia Mazzuca, Antonio Palleschi, Ernesto Placidi, Fernando Formaggio, Claudio Toniolo, Mariano Venanzi
Peptide self-assembly is ubiquitous in nature. It governs the organization of proteins, controlling their folding kinetics and preserving their structure stability and bioactivity. In this connection, model oligopeptides may give important insights on the molecular mechanisms and elementary forces driving the formation of supramolecular structures. In this contribution we show that a single residue substitution, i.e. Aib (α-aminoisobutyric acid) in place of Ala at position 4 of an -(L-Ala)5- homo-oligomer, strongly alters the aggregation process...
May 24, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29792383/donor-variation-and-optimization-of-human-mesenchymal-stem-cells-chondrogenesis-in-hyaluronic-acid
#4
Minwook Kim, Isaac E Erickson, Alice H Huang, Sean T Garrity, Robert L Mauck, David R Steinberg
Mesenchymal stem cells (MSCs) are an attractive cell type for cartilage repair that can undergo chondrogenesis in a variety of three dimensional (3D) scaffolds. Hyaluronic acid (HA) hydrogels provide a biologically relevant interface for cell encapsulation. While our previous studies have shown that MSC-laden HA constructs can mature in vitro to match native mechanical properties using cells from animal sources, clinical application will depend on the successful translation of these findings to human cells...
May 24, 2018: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29790875/visible-light-induced-electropolymerization-of-suspended-hydrogel-bioscaffolds-in-a-microfluidic-chip
#5
Pan Li, Haibo Yu, Na Liu, Feifei Wang, Gwo-Bin Lee, Yuechao Wang, Lianqing Liu, Wen Jung Li
The development of microengineered hydrogels co-cultured with cells in vitro could advance in vivo bio-systems in both structural complexity and functional hierarchy, which holds great promise for applications in regenerative tissues or organs, drug discovery and screening, and bio-sensors or bio-actuators. Traditional hydrogel microfabrication technologies such as ultraviolet (UV) laser or multiphoton laser stereolithography and three-dimensional (3D) printing systems have advanced the development of 3D hydrogel micro-structures but need either expensive and complex equipment, or harsh material selection with limited photoinitiators...
May 23, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/29790811/nanoscaffolds-in-promoting-regeneration-of-the-peripheral-nervous-system
#6
Chen Aijie, Lai Xuan, Liang Huimin, Zhang Yanli, Kang Yiyuan, Lin Yuqing, Shao Longquan
The ability to surgically repair peripheral nerve injuries is urgently needed. However, traditional tissue engineering techniques, such as autologous nerve transplantation, have some limitations. Therefore, tissue engineered autologous nerve grafts have become a suitable choice for nerve repair. Novel tissue engineering techniques derived from nanostructured conduits have been shown to be superior to other successful functional neurological structures with different scaffolds in terms of providing the required structures and properties...
May 2018: Nanomedicine
https://www.readbyqxmd.com/read/29790251/chitosan-biphasic-calcium-phosphate-scaffolds-functionalized-with-bmp-2-encapsulated-nanoparticles-and-rgd-for-bone-regeneration
#7
Donglin Gan, Min Liu, Tong Xu, Kefeng Wang, Hui Tan, Xiong Lu
The BMP-2 encapsulated BNPs are prepared by a desolvation method, and are further coated by chitosan (CHI) coatings to obtain positively charged NPs (CBNPs). Va The BMP-2 encapsulated BNPs are prepared by a desolvation method, and are further coated by chitosan (CHI) coatings to obtain positively charged NPs (CBNPs) Advancements in bone tissue engineering require the improvement of tissue scaffolds, which should not only exhibit suitable mechanical properties and highly porous structures, but also effectively carry signaling molecules that can mediate bone formation and tissue regeneration...
May 23, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29790189/the-identification-of-a-novel-antibody-for-cd133-using-human-antibody-phage-display
#8
Paige M Glumac, Colleen L Forster, Hong Zhou, Paari Murugan, Shilpa Gupta, Aaron M LeBeau
BACKGROUND: The transmembrane glycoprotein CD133 is believed to be a marker of adult prostate stem cells and cancer stem/initiating cells. Investigating the role of CD133 in the normal biology of the prostate and in cancer is complicated by the lack of a sensitive and accurate antibody for its detection. Here, we describe the characterization of a unique antibody identified using human antibody phage display that can recognize CD133 in both formalin-fixed tissues and cell lines. METHODS: A human single-chain variable fragment (scFv) antibody phage display library possessing a diversity of 8 × 109 was screened against fully glycosylated recombinant CD133...
May 22, 2018: Prostate
https://www.readbyqxmd.com/read/29787331/a-customizable-low-cost-perfusion-system-for-sustaining-tissue-constructs
#9
Brian O'Grady, Jason Wang, Shannon Faley, Daniel Balikov, Ethan Lippmann, Leon M Bellan
The fabrication of engineered vascularized tissues and organs requiring sustained, controlled perfusion has been facilitated by the development of several pump systems. Currently, researchers in the field of tissue engineering require the use of pump systems that are in general large, expensive, and generically designed. Overall, these pumps often fail to meet the unique demands of perfusing clinically useful tissue constructs. Here, we describe a pumping platform that overcomes these limitations and enables scalable perfusion of large, three-dimensional hydrogels...
May 1, 2018: SLAS Technology
https://www.readbyqxmd.com/read/29786707/biocompatible-alkyl-cyanoacrylates-and-their-derivatives-as-bio-adhesives
#10
REVIEW
Jay M Korde, Balasubramanian Kandasubramanian
Cyanoacrylate adhesives and their homologues have elicited interest over the past few decades owing to their applications in the biomedical sector, extending from tissue adhesives to scaffolds to implants to dental material and adhesives, because of their inherent biocompatibility and ability to polymerize solely with moisture, thanks to which they adhere to any substrate containing moisture such as the skin. The ability to tailor formulations of alkyl cyanoacrylate to form derivative compounds to meet application requirements along with their biodegradability in conjunction with their inherent biocompatibility make them highly sought after candidates in the biomedical sector...
May 22, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/29786560/microfabrication-of-liver-and-heart-tissues-for-drug-development
#11
REVIEW
Grace E Brown, Salman R Khetani
Drug-induced liver- and cardiotoxicity remain among the leading causes of preclinical and clinical drug attrition, marketplace drug withdrawals and black-box warnings on marketed drugs. Unfortunately, animal testing has proven to be insufficient for accurately predicting drug-induced liver- and cardiotoxicity across many drug classes, likely due to significant differences in tissue functions across species. Thus, the field of in vitro human tissue engineering has gained increasing importance over the last 10 years...
July 5, 2018: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/29786553/from-skeletal-development-to-the-creation-of-pluripotent-stem-cell-derived-bone-forming-progenitors
#12
REVIEW
Wai Long Tam, Frank P Luyten, Scott J Roberts
Bone has many functions. It is responsible for protecting the underlying soft organs, it allows locomotion, houses the bone marrow and stores minerals such as calcium and phosphate. Upon damage, bone tissue can efficiently repair itself. However, healing is hampered if the defect exceeds a critical size and/or is in compromised conditions. The isolation or generation of bone-forming progenitors has applicability to skeletal repair and may be used in tissue engineering approaches. Traditionally, bone engineering uses osteochondrogenic stem cells, which are combined with scaffold materials and growth factors...
July 5, 2018: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/29785105/development-and-blood-compatibility-assessment-of-electrospun-polyvinyl-alcohol-blended-with-metallocene-polyethylene-and-plectranthus-amboinicus-pva-mpe-pa-for-bone-tissue-engineering
#13
Jie Qi, Huang Zhang, Yingzhou Wang, Mohan Prasath Mani, Saravana Kumar Jaganathan
Introduction: Currently, the design of extracellular matrix (ECM) with nanoscale properties in bone tissue engineering is challenging. For bone tissue engineering, the ECM must have certain properties such as being nontoxic, highly porous, and should not cause foreign body reactions. Materials and methods: In this study, the hybrid scaffold based on polyvinyl alcohol (PVA) blended with metallocene polyethylene (mPE) and plectranthus amboinicus (PA) was fabricated for bone tissue engineering via electrospinning...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29784648/mouse-models-of-nesprin-related-diseases
#14
REVIEW
Can Zhou, Li Rao, Derek T Warren, Catherine M Shanahan, Qiuping Zhang
Nesprins (nuclear envelope spectrin repeat proteins) are a family of multi-isomeric scaffolding proteins. Nesprins form the LInker of Nucleoskeleton-and-Cytoskeleton (LINC) complex with SUN (Sad1p/UNC84) domain-containing proteins at the nuclear envelope, in association with lamin A/C and emerin, linking the nucleoskeleton to the cytoskeleton. The LINC complex serves as both a physical linker between the nuclear lamina and the cytoskeleton and a mechanosensor. The LINC complex has a broad range of functions and is involved in maintaining nuclear architecture, nuclear positioning and migration, and also modulating gene expression...
May 21, 2018: Biochemical Society Transactions
https://www.readbyqxmd.com/read/29784586/ultrasound-mediated-gene-delivery-enhances-tendon-allograft-integration-in-mini-pig-ligament-reconstruction
#15
Maxim Bez, Thomas J Kremen, Wafa Tawackoli, Pablo Avalos, Dmitriy Sheyn, Galina Shapiro, Joseph C Giaconi, Shiran Ben David, Jess G Snedeker, Zulma Gazit, Katherine W Ferrara, Dan Gazit, Gadi Pelled
Ligament injuries occur frequently, substantially hindering routine daily activities and sports participation in patients. Surgical reconstruction using autogenous or allogeneic tissues is the gold standard treatment for ligament injuries. Although surgeons routinely perform ligament reconstructions, the integrity of these reconstructions largely depends on adequate biological healing of the interface between the ligament graft and the bone. We hypothesized that localized ultrasound-mediated, microbubble-enhanced therapeutic gene delivery to endogenous stem cells would lead to significantly improved ligament graft integration...
April 26, 2018: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/29783786/graphene-based-nanomaterials-for-tissue-engineering-in-the-dental-field
#16
REVIEW
Riccardo Guazzo, Chiara Gardin, Gloria Bellin, Luca Sbricoli, Letizia Ferroni, Francesco Saverio Ludovichetti, Adriano Piattelli, Iulian Antoniac, Eriberto Bressan, Barbara Zavan
The world of dentistry is approaching graphene-based nanomaterials as substitutes for tissue engineering. Apart from its exceptional mechanical strength, electrical conductivity and thermal stability, graphene and its derivatives can be functionalized with several bioactive molecules. They can also be incorporated into different scaffolds used in regenerative dentistry, generating nanocomposites with improved characteristics. This review presents the state of the art of graphene-based nanomaterial applications in the dental field...
May 20, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29782947/multifunctional-degradable-electronic-scaffolds-for-cardiac-tissue-engineering
#17
Ron Feiner, Sharon Fleischer, Assaf Shapira, Or Kalish, Tal Dvir
The capability to on-line sense tissue function, provide stimulation to control contractility and efficiently release drugs within an engineered tissue microenvironment may enhance tissue assembly and improve the therapeutic outcome of implanted engineered tissues. To endow cardiac patches with such capabilities we developed elastic, biodegradable, electronic scaffolds. The scaffolds were composed of electrospun albumin fibers that served as both a substrate and a passivation layer for evaporated gold electrodes...
May 18, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29782946/delivery-of-the-improved-bmp-2-advanced-plasmid-dna-within-a-gene-activated-scaffold-accelerates-mesenchymal-stem-cell-osteogenesis-and-critical-size-defect-repair
#18
Rosanne M Raftery, Irene Mencía-Castaño, Simon Sperger, Gang Chen, Brenton Cavanagh, Georg Feichtinger, Heinz Redl, Ara Hacobian, Fergal J O'Brien
Gene-activated scaffolds have been shown to induce controlled, sustained release of functional transgene both in vitro and in vivo. Bone morphogenetic proteins (BMPs) are potent mediators of osteogenesis however we found that the delivery of plasmid BMP-2 (pBMP-2) alone was not sufficient to enhance bone formation. Therefore, the aim of this study was to assess if the use of a series of modified BMP-2 plasmids could enhance the functionality of a pBMP-2 gene-activated scaffold and ultimately improve bone regeneration when implanted into a critical sized bone defect in vivo...
May 18, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29782142/projection-based-3d-printing-of-cell-patterning-scaffolds-with-multi-scale-channels
#19
Dai Xue, Yancheng Wang, Jiaxin Zhang, Deqing Mei, Yue Wang, Shaochen Chen
To fully actualize artificial, cell-laden biological models in tissue engineering, such as 3D organoids and organs-on-a-chip systems, cells need to be patterned such that they can precisely mimic natural microenvironments in vitro. Despite increasing interest in this area, patterning cells at multiscales (~10 μm - 10 mm) remains a significant challenge in bioengineering. Here we report a projection-based 3D printing system that achieves rapid and high-resolution fabrication of hydrogel scaffolds featuring intricate channels for multi-scale cell patterning...
May 21, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29781355/development-and-biological-validation-of-a-cyclic-stretch-culture-system-for-the-ex-vivo-engineering-of-tendons
#20
Manuela Teresa Raimondi, Matteo Laganà, Claudio Conci, Michele Crestani, Alessia Di Giancamillo, Francesca Gervaso, Daniela Deponti, Federica Boschetti, Michele M Nava, Chiara Scandone, Cinzia Domeneghini, Alessandro Sannino, Giuseppe M Peretti
INTRODUCTION: An innovative approach to the treatment of tendon injury or degeneration is given by engineered grafts, made available through the development of bioreactors that generate tendon tissue in vitro, by replicating in vivo conditions. This work aims at the design of a bioreactor capable of applying a stimulation of cyclic strain on cell constructs to promote the production of bioartificial tissue with mechanical and biochemical properties resembling those of the native tissue...
May 1, 2018: International Journal of Artificial Organs
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