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Biomaterials Science

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https://www.readbyqxmd.com/read/30519699/external-temperature-control-of-lymphatic-drainage-of-thermo-sensitive-nanomaterials
#1
Mingming Zhang, Wenjuan Chen, Yanhang Hong, Han Chen, Chun Wang
Nano-carrier-facilitated delivery of bioactive molecules into lymph nodes (LNs) has found application in the treatment and diagnosis of numerous immune-related diseases. Much work has focused on optimization of physicochemical properties of the nano-carrier to enhance lymphatic drainage passively, whereas active modulation of the quantity and timing of lymphatic delivery remains a significant challenge. Here, inspired by the success of thermo-modulation of tumor targeting, we have developed a simple external temperature control strategy to regulate the distribution of thermo-sensitive nanomaterials between the injection site and draining LNs...
December 6, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30519686/rapid-identification-of-specific-dna-aptamers-precisely-targeting-cd33-positive-leukemia-cells-through-a-paired-cell-based-approach
#2
Chang Yang, Yun Wang, Ming Hua Ge, Yu Jie Fu, Rui Hao, Khairul Islam, Ping Huang, Fu Chen, Jie Sun, De Fei Hong, Hua Naranmandura
Aptamers are short single-stranded DNA or RNA molecules, which have recently been developed for potential broad applications such as clinical therapeutics, diagnosis and tumor-targeted drug delivery. However, the selection of specific aptamers is often unsatisfactory using the classical protein or cell-based SELEX. Herein, we modified the paired cell line approach to identify aptamers targeting leukemia cells expressing the CD33 antigen. Our strategy artfully used the same cells for negative (HEK293T cells) and positive (CD33 transfected-HEK293T cells) aptamer selections, and the negative selections were performed adequately before the positive selection to remove unspecific sequences...
December 6, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30519681/polypeptide-affined-interpenetrating-hydrogels-with-tunable-physical-and-mechanical-properties
#3
Farshad Oveissi, Sina Naficy, Thi Yen Loan Le, David F Fletcher, Fariba Dehghani
Novel hydrogels with tunable mechanical properties similar to human soft tissue have increasing applications in biomedicine, soft robotics, and biocompatible electronics. However, most of these materials require multiple-step fabrication, are not robust, and compromise bioactivity. Thus, aiming to address these shortfalls, herein, we report a versatile hydrogel system with tunable properties and a facile one-pot fabrication process. The hydrogel system is comprised of a hydrogen-bonded hydrophilic polyurethane (HPU) network and a loosely crosslinked copolymer crosslinked with long chain crosslinkers and decorated with succinimide groups...
December 6, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30515503/macromolecular-crowding-tunes-3d-collagen-architecture-and-cell-morphogenesis
#4
S K Ranamukhaarachchi, R N Modi, A Han, D O Velez, A Kumar, A J Engler, S I Fraley
Collagen I is the primary extracellular matrix component of most solid tumors and influences metastatic progression. Collagen matrix engineering techniques are useful for understanding how this complex biomaterial regulates cancer cell behavior and for improving in vitro cancer models. Here, we establish an approach to tune collagen fibril architecture using PEG as an inert molecular crowding agent during gelation and cell embedding. We find that crowding produces matrices with tighter fibril networks that are less susceptible to proteinase mediated degradation, but does not significantly alter matrix stiffness...
December 5, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30515491/one-month-zero-order-sustained-release-and-tumor-eradication-after-a-single-subcutaneous-injection-of-interferon-alpha-fused-with-a-body-temperature-responsive-polypeptide
#5
Zhuoran Wang, Jianwen Guo, Jing Ning, Xiaoyu Feng, Xinyu Liu, Jiawei Sun, Xiangmei Chen, Fengmin Lu, Weiping Gao
Most therapeutic proteins except antibodies necessitate frequent dosing at high concentrations due to their short circulation half-lives, leading to limited therapeutic efficacy, serious adverse side effects and poor patient compliance. Herein we report a strategy of thermoresponsive polypeptide fusion to genetically engineer a super-long-acting interferon alpha fused with a body-temperature-responsive polypeptide. After a single subcutaneous injection in a mouse model, this interferon alpha can in situ form a depot to show a one-month zero-order sustained release, which would enable a once-trimonthly dosing in humans...
December 5, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30511718/the-surrounding-tissue-contributes-to-smooth-muscle-cells-regeneration-and-vascularization-of-small-diameter-vascular-grafts
#6
Jing Liu, Yibo Qin, Yifan Wu, Zhiting Sun, Binhan Li, Huimin Jing, Chuangnian Zhang, Chen Li, Xigang Leng, Zhihong Wang, Deling Kong
Small diameter vascular grafts have been promising substitutes for bypass surgery to treat cardiovascular disease. However, no ideal product is available in the clinic. In order to design improved, next generation vascular grafts, it is essential to understand the cellular and molecular mechanisms underlying tissue regeneration after vascular graft implantation. Two diverse microenvironments, circulating blood and the surrounding tissue, are involved in the regeneration process after vascular graft implantation in situ...
December 4, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30511062/layer-by-layer-deposition-of-chitosan-nanoparticles-as-drug-release-coatings-for-pcl-nanofibers
#7
Steffen Sydow, Dominik de Cassan, Robert Hänsch, Thomas R Gengenbach, Christopher D Easton, Helmut Thissen, Henning Menzel
Nanogels were prepared by ionotropic gelation of chitosan (CS) with tripolyphosphate (TPP). The use of such nanogels to prepare coatings by layer-by-layer deposition (LbL) was studied. The nanogels were characterized in terms of particle size, zeta-potential and stability. Nanogel suspensions were used to build polyelectrolyte multilayers on silicon wafers and on PCL fiber mats by LbL-deposition. Three different polysaccharides were used as polyanions, namely chondroitin sulfate, alginate and hyaluronic acid...
December 4, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30511057/bimetallic-gold-nanorods-with-enhanced-biocorona-formation-for-doxorubicin-loading-and-sustained-release
#8
Debolina Chakraborty, Lavanya Mohan, Sruthi Ann Alex, Natarajan Chandrasekaran, Amitava Mukherjee
The biomedical applicability of gold nanorods (AuNRs) arises due to their interesting optical and photothermal properties, which can result in the formation of a protein corona layer when exposed to the physiological system. The current study focuses on the effect of bimetallic coatings of AuNRs (AuNRs@Pd and AuNRs@Cu) on protein corona formation, and the potential application of protein-coronated bimetallic AuNRs was investigated for doxorubicin (dox) loading, release, and in vitro cytotoxicity analysis. Two significant proteins in blood serum, namely, human serum albumin (HSA) and transferrin, were chosen for the protein coronation...
December 4, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30507990/versatile-iron-catechol-based-nanoscale-coordination-polymers-with-antiretroviral-ligand-functionalization-and-their-use-as-efficient-carriers-in-hiv-aids-therapy
#9
Rubén Solórzano, Olivia Tort, Javier García-Pardo, Tuixent Escribà, Julia Lorenzo, Mireia Arnedo, Daniel Ruiz-Molina, Ramon Alibés, Félix Busqué, Fernando Novio
A novel chemical approach integrating the benefits of nanoparticles with versatility of coordination chemistry is reported herein to increase the effectiveness of well-known HIV antiretroviral drugs. The novelty of our approach is illustrated using a catechol ligand tethered to the known antiretroviral azidothymidine (AZT) as a constitutive building block of the nanoparticles. The resulting nanoscale coordination polymers (NCPs) ensure good encapsulation yields and equivalent antiretroviral activity while significantly diminishing its cytotoxicity...
December 3, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30507979/retraction-the-next-generation-cell-penetrating-peptide-and-carbon-dot-conjugated-nano-liposome-for-transdermal-delivery-of-curcumin
#10
Neil Hammond
Retraction of 'The next generation cell-penetrating peptide and carbon dot conjugated nano-liposome for transdermal delivery of curcumin' by Santanu Patra et al., Biomater. Sci., 2016, 4, 418-429.
December 3, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30500018/the-influence-of-trapping-agents-on-the-antitumor-efficacy-of-irinotecan-liposomes-head-to-head-comparison-of-ammonium-sulfate-sulfobutylether-%C3%AE-cyclodextrin-and-sucrose-octasulfate
#11
Wenqian Yang, Zimeng Yang, Jingru Fu, Mengran Guo, Bingjun Sun, Wei Wei, Dan Liu, Hongzhuo Liu
Remote loading technology is an outstanding achievement in liposome-based drug delivery systems. Compared with conventional passive loading, remote loading technology exhibits unique superiority in terms of high drug loading efficiency, low leakage rate and adequate drug accumulation. In the intra-liposome aqueous phase, the counterion of the trapping agent can control the state of aggregation/crystallization of the drug-counterion salt, and thereby contribute to control the efficiency of remote loading. Herein, irinotecan (CPT-11)-loaded liposomes were developed using three trapping agents: ammonium sulfate (AS), sulfobutylether-β-cyclodextrin (SBE-β-CD) and sucrose octasulfate (SOS)...
November 30, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30500010/hypoxia-and-singlet-oxygen-responsive-chemo-photodynamic-micelles-featured-with-glutathione-depletion-and-aldehyde-production
#12
Jian Deng, Fang Liu, Lina Wang, Yang An, Min Gao, Zheng Wang, Yanjun Zhao
Triggered drug release from anti-tumor nanomedicine is an efficient approach to address the dilemma of systemic nanocarrier stability and on-demand drug liberation in tumor sites. Combinational drug delivery has been a useful means to enhance antitumor efficacy and reduce adverse effects. We report a multifunctional micelle for dually hypoxia- and singlet oxygen-responsive integration of chemotherapy and photodynamic therapy. The micelles were made of a nitroimidazole (NI)-bearing polymer; doxorubicin (Dox) and chlorin e6 (Ce6) were selected as the model chemodrug and photosensitizer, respectively...
November 30, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30488906/controlled-synthesis-and-assembly-of-ultra-small-nanoclusters-for-biomedical-applications
#13
Qiyue Wang, Shuying Wang, Xi Hu, Fangyuan Li, Daishun Ling
Inorganic nanomaterials have been studied extensively in recent years because of their unique physical and chemical characteristics. Moreover, ultra-small nanoclusters (USNCs), which are less than 3 nm in size, exhibit extraordinary properties different from those of larger-sized nanoparticles. For example, ultra-small iron oxide nanoclusters (NCs) show paramagnetic properties; ultra-small noble metal NCs exhibit bright fluorescence; most USNCs gain in vivo renal clearance capability to guarantee safety. Therefore, USNCs could be promising safe materials for biomedical applications...
November 29, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30488900/paramagnetic-cus-hollow-nanoflowers-for-t-2-flair-magnetic-resonance-imaging-guided-thermochemotherapy-of-cancer
#14
Hao Zhang, Yaodong Chen, Yunyu Cai, Jun Liu, Pengfei Liu, Zizhuo Li, Tingting An, Xiuhua Yang, Changhao Liang
The development of nanoplatforms with integrated therapeutic and imaging functions is necessary for highly efficient cancer therapy. Herein, 3D CuS hollow nanoflowers (HNs) consisting of 2D nanoplates are successfully fabricated through the technique of laser ablation in liquids followed by ion-exchange reactions and applied for the first time as a theranostic nanoagent for magnetic resonance imaging (MRI), photothermal therapy (PTT), and chemotherapy simultaneously. Due to the sufficient and immediate contact between the exposed cupric centers of nanoplates and protons from water molecules, CuS HNs are demonstrated to be capable of being a T1 positive contrast agent for efficient MRI of tumors on the T2-weighted fluid-attenuated inversion recovery imaging (T2-FLAIR) sequence...
November 29, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30484789/disturbance-of-adhesomes-by-gold-nanoparticles-reveals-a-size-and-cell-type-bias
#15
Vladimir Mulens-Arias, Alice Balfourier, Alba Nicolás-Boluda, Florent Carn, Florence Gazeau
Gold nanoparticles (AuNP) have been thoroughly studied as multifunctional theranosis agents for cell imaging and cancer therapy as well as sensors due to their tunable physical and chemical properties. Although AuNP have proved to be safe in a wide concentration range, yet other important biological effects can arise in the sublethal window of treatment. This is especially pivotal to understand how AuNP can affect cell biology when labeling steps are needed for cell tracking in vivo, as nanoparticle loading can affect cell migratory/invasion ability, a function mediated by filamentous actin-rich nanometric structures collectively called adhesomes...
November 28, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30484785/recombinant-human-bmp-2-accelerates-the-migration-of-bone-marrow-mesenchymal-stem-cells-via-the-cdc42-pak1-limk1-pathway-in-vitro-and-in-vivo
#16
Shuhao Liu, Yang Liu, Libo Jiang, Zheng Li, Soomin Lee, Changsheng Liu, Jing Wang, Jian Zhang
Biomaterials are widely used for bone regeneration and fracture repair. The migration of bone marrow mesenchymal stem cells (BMSCs) into bone defect sites or material implantation sites, and their differentiation into osteoblasts, is central to the fracture healing process, and the directional migration of BMSCs depends on cytokines or chemokines at the defect site. BMP-2 can stimulate the migration of a variety of cells, but it remains unclear whether BMSC migration can be induced. To provide evidence for BMP-2-induced BMSC migration, we tested the cytoskeletal changes and migration ability of BMSCs after treatment with recombinant human BMP-2 (rhBMP-2)...
November 28, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30484784/manufacturing-human-pluripotent-stem-cell-derived-endothelial-cells-in-scalable-and-cell-friendly-microenvironments
#17
Haishuang Lin, Qian Du, Qiang Li, Ou Wang, Zhanqi Wang, Christian Elowsky, Kan Liu, Chi Zhang, Soonkyu Chung, Bin Duan, Yuguo Lei
Human pluripotent stem cell derived endothelial cells (hPSC-ECs) are of great value for studying and treating vascular diseases. However, manufacturing high quantity and quality hPSC-ECs with current cell culture technologies remains very challenging. Here, we report a novel method that can manufacture hPSC-ECs in scalable and cell-friendly microenvironments to address this challenge. Using this method, hPSCs are expanded and differentiated into ECs in microscale alginate hydrogel tubes. The hydrogel tubes protect cells from the highly variable hydrodynamic conditions and critical hydrodynamic stresses in the culture vessel and limit the cell mass less than the diffusion limits (of human tissue) to ensure efficient mass transport...
November 28, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30483691/differentiating-human-pluripotent-stem-cells-into-vascular-smooth-muscle-cells-in-three-dimensional-thermoreversible-hydrogels
#18
Haishuang Lin, Qian Du, Qiang Li, Ou Wang, Zhanqi Wang, Kan Liu, Leonard Akert, Chi Zhang, Soonkyu Chung, Bin Duan, Yuguo Lei
Vascular smooth muscle cells (VSMCs) are of great value and are needed in large quantities for tissue engineering, drug screening, disease modeling and cell-based therapies. However, getting high quantity VSMCs remains a challenge. Here, we report a method for the scalable manufacturing of VSMCs from human pluripotent stem cells (hPSCs). hPSCs are expanded and differentiated into VSMCs in a three dimensional (3D) thermoreversible hydrogel. The hydrogel not only acts as a 3D scaffold for cells to grow, but also protects cells from hydrodynamic stresses in the culture vessel and prevents cells from excessive aggregation...
November 28, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30475373/self-assembling-peptides-cross-linked-with-genipin-resilient-hydrogels-and-self-standing-electrospun-scaffolds-for-tissue-engineering-applications
#19
Raffaele Pugliese, Mahboubeh Maleki, Ronald N Zuckermann, Fabrizio Gelain
Self-assembling peptides (SAPs) are synthetic bioinspired biomaterials that can be feasibly multi-functionalized for applications in surgery, drug delivery, optics and tissue engineering (TE). Despite their promising biocompatibility and biomimetic properties, they have never been considered real competitors of polymers and/or cross-linked extracellular matrix (ECM) natural proteins. Indeed, synthetic SAP-made hydrogels usually feature modest mechanical properties, limiting their potential applications, due to the transient non-covalent interactions involved in the self-assembling phenomenon...
November 26, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30474655/anti-biofouling-therapeutic-nanoparticles-with-removable-shell-and-highly-efficient-internalization-by-cancer-cells
#20
Dong Chen, Huangyong Jiang, Dongbo Guo, Wumaier Yasen, Junping Ao, Yue Su, Dongsheng Pan, Xin Jin, Xinyuan Zhu
Cationic gelatin nanoparticles ((+)nGNPs) were prepared by in situ polymerization upon the surfaces of monodispersed gelatin nanoparticles (GNPs) using N-(3-Aminopropyl)methacrylamide (APm) as monomer, which were then decorated with doxorubicin terminated poly(2-methylacryloyloxyethyl phosphorylcholine) (DOX-pMPC) via EDC/NHS conjugation to obtain core-shell nanoparticles ((+)nGNPs@DOX-pMPC) for cancer therapy. The non-fouling pMPC shell could effectively shield the positively charged surface of inner nanoparticle and prevent non-specific protein adsorption, thus endowing the materials with potential for long-acting cancer treatment...
November 26, 2018: Biomaterials Science
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