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Journal of Materials Chemistry. B, Materials for Biology and Medicine

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https://www.readbyqxmd.com/read/28630710/hdac-inhibitor-conjugated-polymeric-prodrug-micelles-for-doxorubicin-delivery
#1
Suchithra A Senevirathne, Katherine E Washington, Jason B Miller, Michael C Biewer, David Oupicky, Daniel J Siegwart, Mihaela C Stefan
Amphiphilic diblock copolymers bearing histone deacetylase inhibitors (HDACi) (4-phenyl butyric acid and valproic acid) were synthesized by the ring-opening polymerization of γ-4-phenylbutyrate-ε-caprolactone (PBACL), γ-valproate-ε-caprolactone (VPACL), and ε-caprolactone (CL) from a poly(ethylene glycol) macroinitiator (PEG). These amphiphilic diblock copolymers self-assembled into stable pro-drug micelles and demonstrated excellent biocompatibility. High loading of doxorubicin (DOX) up to 5.1 wt% was achieved...
March 21, 2017: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/28529754/chitosan-poly-caprolactone-nanofibers-for-skin-repair
#2
Sheeny Lan Levengood, Ariane E Erickson, Fei-Chien Chang, Miqin Zhang
Dermal wounds, both acute and chronic, represent a significant clinical challenge and therefore the development of novel biomaterial-based skin substitutes to promote skin repair is essential. Nanofibers have garnered attention as materials to promote skin regeneration due to the similarities in morphology and dimensionality between nanofibers and native extracellular matrix proteins, which are critical in guiding cutaneous wound healing. Electrospun chitosan-poly(caprolactone) (CPCL) nanofiber scaffolds, which combine the important intrinsic biological properties of chitosan and the mechanical integrity and stability of PCL, were evaluated as skin tissue engineering scaffolds using a mouse cutaneous excisional skin defect model...
March 7, 2017: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/28066550/a-microfluidic-based-cell-encapsulation-platform-to-achieve-high-long-term-cell-viability-in-photopolymerized-pegnb-hydrogel-microspheres
#3
Zhongliang Jiang, Bingzhao Xia, Ralph McBride, John Oakey
Cell encapsulation within photopolymerized polyethylene glycol (PEG)-based hydrogel scaffolds has been demonstrated as a robust strategy for cell delivery, tissue engineering, regenerative medicine, and developing in vitro platforms to study cellular behavior and fate. Strategies to achieve spatial and temporal control over PEG hydrogel mechanical properties, chemical functionalization, and cytocompatibility have advanced considerably in recent years. Recent microfluidic technologies have enabled the miniaturization of PEG hydrogels, thus enabling the fabrication of miniaturized cell-laden vehicles...
January 7, 2017: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/28025618/ab3-loaded-and-tumor-targeted-unimolecular-micelles-for-medullary-thyroid-cancer-treatment
#4
Renata Jaskula-Sztul, Guojun Chen, Ajitha Dammalapati, April Harrison, Weiping Tang, Shaoqin Gong, Herbert Chen
Medullary thyroid cancer (MTC) is often resistant to standard therapies, emphasizing the need for the development of other treatments. A new histone deacetylase inhibitor, AB3, can effectively inhibit MTC cell proliferation in vitro. However, its poor aqueous solubility and stability, fast clearance, and lack of tumor targeting ability limit its in vivo application. Therefore, multifunctional unimolecular micelles were developed for targeted delivery of AB3 for MTC therapy. The unimolecular micelles exhibited a spherical core-shell structure, uniform size distribution, and excellent stability...
January 7, 2017: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/28626582/fluorescent-flavonoids-for-endoplasmic-reticulum-cell-imaging
#5
Lucas McDonald, Bin Liu, Alexandra Taraboletti, Kyle Whiddon, Leah P Shriver, Michael Konopka, Qin Liu, Yi Pang
Visualization of subcellular organelles in vivo is critical for basic biomedical research and clinical applications. Two new flavonoids with an amide substituent were synthesized and characterized. The flavonoids were nearly non-fluorescent in aqueous environment, but exhibited two emission peaks (one λem at 495-536 nm and the other at 570-587 nm) in organic solvents, which were assigned to the excited normal (N(*)) and tautomer (T(*)) emission. When the dyes were examined on oligodendrocyte cells, they were found to selectively accumulate in the endoplasmic reticulum (ER), a eukaryotic organelle involved in lipid and protein synthesis, giving fluorescence turn-on...
December 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/28580145/lysosome-oriented-dual-stage-ph-responsive-polymeric-micelles-for-%C3%AE-lapachone-delivery
#6
Yinjian Zhou, Ying Dong, Gang Huang, Yiguang Wang, Xiaonan Huang, Fayun Zhang, David A Boothman, Jinming Gao, Wei Liang
β-Lapachone (β-lap), a novel anticancer agent, is bioactivated by NADP(H):quinone oxidoreductase 1 (NQO1), an enzyme over-expressed in numerous tumors, including lung, pancreas, breast, and prostate cancers. Fast renal clearance and methemaglobinemia / hemolytic side-effects from the clinical formulation (β-lap-hydroxyl propyl-β-cyclodextrin complex) hindered its clinical translation. Here, we investigated a dual model pH responsive polymers for β-lap delivery. Three pH-sensitive linkages, including acylhydrazone, ketal and imine bonds for β-lap prodrug syntheses result in an aryl imine linkage the most optimal linkage...
December 14, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/28503305/three-dimensional-conjugation-of-recombinant-n-cadherin-to-a-hydrogel-for-in-vitro-anisotropic-neural-growth
#7
Johana C M Vega L, Min Kyung Lee, Ellen C Qin, Max Rich, Kwan Young Lee, Dong Hyun Kim, Hee Jung Chung, Deborah E Leckband, Hyunjoon Kong
Living cells are extensively being studied to build functional tissues that are useful for both fundamental and applied bioscience studies. Increasing evidence suggests that cell-cell adhesion controlled by intercellular cadherin junction plays important roles in the quality of the resulting engineered tissue. These findings prompted efforts to interrogate biological effects of cadherin at a molecular scale; however, few efforts were made to harness the effects of cadherin on cells cultured in an in vivo-like three dimensional matrix...
November 14, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/28133536/approaches-for-building-bioactive-elements-into-synthetic-scaffolds-for-bone-tissue-engineering
#8
Venu Kesireddy, F Kurtis Kasper
Bone tissue engineering (BTE) is emerging as a possible solution for regeneration of bone in a number of applications. For effective utilization, BTE scaffolds often need modifications to impart biological cues that drive diverse cellular functions such as adhesion, migration, survival, proliferation, differentiation, and biomineralization. This review provides an outline of various approaches for building bioactive elements into synthetic scaffolds for BTE and classifies them broadly under two distinct schemes; namely, the top-down approach and the bottom-up approach...
November 14, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/28461887/recovery-property-of-double-network-hydrogel-containing-mussel-inspired-adhesive-moiety-and-nano-silicate
#9
Yuan Liu, Bruce P Lee
Altough double network (DN) hydrogels are extremly tough, they are irreversibly softened during large strain deformation. We incorporated mussel-inspired adhesive moiety, catechol, and a synthetic nano-silicate, Laponite, into DN to examine the effect of strong, reversible crosslinks on the DN's ability to recover its mechanical properties during successive loading cycles. The introduction of catechol and Laponite drastically increased the compressive strength and toughness of DN without compromising the compliance of the hydrogel...
October 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27928505/collagen-a-network-for-regenerative-medicine
#10
REVIEW
K M Pawelec, S M Best, R E Cameron
The basic building block of the extra-cellular matrix in native tissue is collagen. As a structural protein, collagen has an inherent biocompatibility making it an ideal material for regenerative medicine. Cellular response, mediated by integrins, is dictated by the structure and chemistry of the collagen fibers. Fiber formation, via fibrillogenesis, can be controlled in vitro by several factors: pH, ionic strength, and collagen structure. After formation, fibers are stabilized via cross-linking. The final bioactivity of collagen scaffolds is a result of both processes...
October 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/28133535/3d-porous-chitosan-alginate-scaffolds-promote-proliferation-and-enrichment-of-cancer-stem-like-cells
#11
Stephen J Florczyk, Forrest M Kievit, Kui Wang, Ariane E Erickson, Richard G Ellenbogen, Miqin Zhang
Cancer stem cells are increasingly becoming a primary target for new cancer treatment development. The ability to study their transient behavior in vitro will provide the opportunity for high-throughput testing of more effective therapies. We have previously demonstrated the use of 3D porous chitosan-alginate (CA) scaffolds to promote cancer stem-like cell (CSC) proliferation and enrichment in glioblastoma. Here we use 3D porous CA scaffolds to promote cancer stem-like cell enrichment in cell lines from prostate, liver, and breast cancers, and investigate the proliferation, morphology, and gene expressions of cells cultured in CA scaffolds as compared to 2D controls...
October 14, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27746916/co-operative-transitions-of-responsive-polymer-coated-gold-nanoparticles-precision-tuning-and-direct-evidence-for-co-operative-aggregation
#12
Sangho Won, Daniel J Phillips, Marc Walker, Matthew I Gibson
Responsive polymers and polymer-coated nanoparticles have many potential bio-applications with the crucial parameter being the exact temperature where the transition occurs. Chemical modification of hydrophobic/hydrophilic or ligand binding sites has been widely explored as a tool for controlling this transition, but requires the synthesis of many different components to achieve precise control. This study reports an extensive investigation into the use of blending (i.e. mixing) as a powerful tool to modulate the transition temperature of poly(N-isopropylacrylamide) (PNIPAM) coated gold nanoparticles...
September 14, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27746915/fortified-interpenetrating-polymers-bacteria-resistant-coatings-for-medical-devices
#13
Seshasailam Venkateswaran, Orlando David Henrique Dos Santos, Emma Scholefield, Annamaria Lilienkampf, Peter J Gwynne, David G Swann, Kevin Dhaliwal, Maurice P Gallagher, Mark Bradley
Infections arising from contaminated medical devices are a serious global issue, contributing to antibiotic resistance and imposing significant strain on healthcare systems. Since the majority of medical device-associated infections are biofilm related, efforts are being made to generate either bacteria-repellent or antibacterial coatings aimed at preventing bacterial colonisation. Here, we utilise a nanocapsule mediated slow release of a natural antimicrobial to improve the performance of a bacteria repellent polymer coating...
August 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/28044100/photocrosslinkable-chitosan-hydrogels-functionalized-with-the-rgd-peptide-and-phosphoserine-to-enhance-osteogenesis
#14
Soyon Kim, Zhong-Kai Cui, Jiabing Fan, Armita Fartash, Tara L Aghaloo, Min Lee
Hydrogels derived from naturally occurring polymers are attractive matrix for tissue engineering. Here, we report a biofunctional hydrogel for specific use in bone regeneration by introducing Arg-Gly-Asp (RGD)-containing cell adhesive motifs and phosphorylated serine residues, which are prevalent in native bone extracellular matrix and known to promote osteogenesis by enhancing cell-matrix interactions and hydroxyapatite nucleation, into photopolymerizable methacrylated glycol chitosan (MeGC). Incorporation of phosphoserine into MeGC hydrogels increased the ability of the hydrogels to nucleate mineral on their surfaces...
August 21, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27429756/three-dimensional-multipod-superstructure-based-on-cu-oh-2-as-a-highly-efficient-nanozyme
#15
Ren Cai, Dan Yang, Xigao Chen, Yun Huang, Yifan Lyv, Jinglin He, Muling Shi, I-Ting Teng, Shuo Wan, Weijia Hou, Weihong Tan
A highly efficient nanozyme system, termed hollow multipod Cu(OH)2 superstructure (HMPS), has been developed via direct conversion from irregular nanoparticles. The HMPS displayed body size around 150 nm and branch lengths in the range of 150~250 nm. Based on the excellent catalytic property of HMPS, we developed a simple and highly sensitive colorimetric assay to detect urine glucose, and the results are in good agreement with hospital examination reports.
July 21, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27746914/pluripotent-stem-cell-derived-hepatocytes-using-materials-to-define-cellular-differentiation-and-tissue-engineering
#16
REVIEW
B Lucendo-Villarin, H Rashidi, K Cameron, D C Hay
Pluripotent stem cell derived liver cells (hepatocytes) represent a promising alternative to primary tissue for biological and clinical applications. To date, most hepatocyte maintenance and differentiation systems have relied upon the use of animal derived components. This serves as a significant barrier to large scale production and application of stem cell derived hepatocytes. Recently, the use of defined biologics has overcome those limitations in two-dimensional monolayer culture. In order to improve the cell phenotype further, three-dimensional culture systems have been employed to better mimic the in vivo situation, drawing upon materials chemistry, engineering and biology...
May 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27551426/substrate-modulus-regulates-osteogenic-differentiation-of-rat-mesenchymal-stem-cells-through-integrin-%C3%AE-1-and-bmp-receptor-type-ia
#17
R Guo, S Lu, A R Merkel, J A Sterling, S A Guelcher
Osteoblast differentiation of mesenchymal stem cells is regulated by both soluble factor (e.g., bone morphogenetic proteins (BMP)) and mechanically transduced signaling, but the mechanisms have only been partially elucidated. In this study, physical association of BMP Receptor I (BMPRI) with integrin β1 sub-unit (Iβ1) was hypothesized to mediate osteoblast differentiation of rat bone marrow-derived mesenchymal stem cells (MSCs) on bone-like substrates. The effects of substrate modulus on osteoblast differentiation of MSCs were investigated for 2D poly(ester urethane) films with moduli varying from 5 - 266 MPa, which spans the range from collagen fibrils to trabecular bone...
May 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27525102/nanoengineered-biomimetic-hydrogels-for-guiding-human-stem-cell-osteogenesis-in-three-dimensional-microenvironments
#18
Arghya Paul, Vijayan Manoharan, Dorothee Krafft, Alexander Assmann, Jorge Alfredo Uquillas, Su Ryon Shin, Anwarul Hasan, Mohammad Asif Hussain, Adnan Memic, Akhilesh K Gaharwar, Ali Khademhosseini
The ability to modulate stem cell differentiation in a three dimensional (3D) microenvironment for bone tissue engineering in absence of exogenous pharmaceutical agents such as bone morphogenic protein (BMP-2) remains a challenge. In this study, we introduce extracellular matrix (ECM)-mimicking nanocomposite hydrogels to induce osteogenic differentiation of human mesenchymal stem cells (hMSCs) for bone regeneration in absence of any osteoinducting factors. In particular, we have reinforced photocrosslinkable collagen-based matrix (gelatin methacryloyl, GelMA) used disk-shaped nanosilicates (nSi), a new class of two-dimensional (2D) nanomaterials...
May 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27499854/mechanical-loading-inhibits-hypertrophy-in-chondrogenically-differentiating-hmscs-within-a-biomimetic-hydrogel
#19
E A Aisenbrey, S J Bryant
Three dimensional hydrogels are a promising vehicle for delivery of adult human bone-marrow derived mesenchymal stem cells (hMSCs) for cartilage tissue engineering. One of the challenges with using this cell type is the default pathway is terminal differentiation, a hypertrophic phenotype and precursor to endochondral ossification. We hypothesized that a synthetic hydrogel consisting of extracellular matrix (ECM) analogs derived from cartilage when combined with dynamic loading provides physiochemical cues for achieving a stable chondrogenic phenotype...
May 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27482381/bioactive-natural-protein-hydroxyapatite-nanocarriers-for-optimizing-osteogenic-differentiation-of-mesenchymal-stem-cells
#20
Z Z Ding, Z H Fan, X W Huang, S M Bai, D W Song, Q Lu, D L Kaplan
Improving the controlled release of bioactive growth factors to regulate cell behavior and tissue regeneration remains a need in tissue engineering and regenerative medicine. Inorganic and polymeric nanoparticles have been extensively fabricated as bioactive biomaterials with enhanced biocompatibility and effective carriers of therapeutic agents, however, challenges remain such as the achievement of high loading capacity and sustained release, and the bioactivity preservation of growth factors. Here, a multilayered, silk coated hydroxyapatite (HA) nanocarrier with drug loading-release capacity superior to pure silk or HA nanoparticles was developed...
May 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
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