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Biomaterials Science

Shen Liu, Hua Chen, Tianyi Wu, Guoqing Pan, Cunyi Fan, Yaozeng Xu, Wenguo Cui
Electrospun fibrous polylactide (PLA) membranes have been widely used for peritendinous anti-adhesion, but their degradation may lead to granuloma formation triggered by macrophages as the result of a foreign body reaction. To understand and solve this problem in peritendinous anti-adhesion, the effects of electrospun fibrous PLA membranes (PLA-M) and the mechanism by which macrophages elicit a foreign body reaction should be elaborated. Thus, the purpose of this study was to evaluate the ability of PLA-M and ibuprofen (IBU)-loaded fibrous PLA membranes (IBU/PLA-M) to prevent adhesion/granuloma formation around the tendon, and to understand the mechanism of macrophage infiltration...
February 22, 2017: Biomaterials Science
Dan Li, Litao Li, Yunlong Ma, Yaping Zhuang, Dawei Li, Hong Shen, Xing Wang, Fei Yang, Yuanzheng Ma, Decheng Wu
Currently, the major issues in the treatment of osteoarticular tuberculosis (TB) after implant placement are low drug concentration at the infected focus and drug resistance resulting from the long-term chemotherapy. The application of drug-loaded polymeric multilayers on implantable devices offers a promising solution to the problems. Herein, a poly(ethylene glycol)-based hydrogel film embedded with isoniazid (INH)-loaded alginate microparticles was fixed to Ti implants via adhesive polydopamine, subsequently capped by poly(lactic-co-glycolic acid) membranes for the sustained and localized delivery of the anti-TB drug...
February 20, 2017: Biomaterials Science
Quazi T H Shubhra, Ayako Oyane, Hiroko Araki, Maki Nakamura, Hideo Tsurushima
This is the first study to report the use of infusion fluids for particle-mediated gene delivery with DNA-immobilized calcium phosphate (CaP) nanoparticles (NPs). In conventional CaP systems, CaP NPs are fabricated in labile supersaturated CaP solutions which are prepared from chemical reagents. In the present study, we fabricated CaP NPs via coprecipitation in labile supersaturated CaP solutions that were prepared from infusion fluids (even the water used was of injectable quality) instead of chemical reagents and demonstrated their gene delivery capabilities for the hard to transfect pluripotent stem cell (C3H10T1/2) along with the easy to transfect CHO-K1 cell...
February 17, 2017: Biomaterials Science
Pier Nicola Sergi, Elisabetta Ada Cavalcanti-Adam
Topographical and chemical cues drive migration, outgrowth and regeneration of neurons in different and crucial biological conditions. In the natural extracellular matrix, their influences are so closely coupled that they result in complex cellular responses. As a consequence, engineered biomaterials are widely used to simplify in vitro conditions, disentangling intricate in vivo behaviours, and narrowing the investigation on particular emergent responses. Nevertheless, how topographical and chemical cues affect the emergent response of neural cells is still unclear, thus in silico models are used as additional tools to reproduce and investigate the interactions between cells and engineered biomaterials...
February 16, 2017: Biomaterials Science
Wei Long Ng, Jia Min Lee, Wai Yee Yeong, May Win Naing
Bioprinting is an emerging research field that has attracted tremendous attention for various applications; it offers a highly automated, advanced manufacturing platform for the fabrication of complex bioengineered constructs. Different bio-inks comprising multiple types of printable biomaterials and cells are utilized during the bioprinting process to improve the homology to native tissues and/or organs in a highly reproducible manner. This paper, presenting a first-time comprehensive yet succinct review of microvalve-based bioprinting, provides an in-depth analysis and comparison of different drop-on-demand bioprinting systems and highlights the important considerations for microvalve-based bioprinting systems...
February 15, 2017: Biomaterials Science
Yi-Mei Zhang, Zheng Huang, Ji Zhang, Wan-Xia Wu, Yan-Hong Liu, Xiao-Qi Yu
Cationic liposomes and polymers are both important candidates for use as non-viral gene vectors. However, both of them have special shortcomings and application limits. This work is devoted to the combination of advantages of liposomes and polymers. The ring-opening polymerization strategy was used for the preparation of amphiphilic polymers from cyclen-based cationic small lipids. The non-hydrophobic polymer and the corresponding lipids were also prepared for performing structure-activity relationship studies...
February 15, 2017: Biomaterials Science
Qing Pei, Xiuli Hu, Junli Zhou, Shi Liu, Zhigang Xie
Paclitaxel dimer-based nanovesicles, with an ultrahigh drug content, have been prepared through a nanoprecipitation method. The as-formed nanovesicles exhibit improved paclitaxel solubility, prominent colloid stability, GSH-triggered disassembly, effective cellular uptake and comparable cytotoxicity to Taxol.
February 13, 2017: Biomaterials Science
Li Yin, Shuxin Xu, Zujian Feng, Hongzhang Deng, Jianhua Zhang, Huijie Gao, Liandong Deng, Hua Tang, Anjie Dong
A novel injectable and high-solid-content drug-loaded supramolecular hydrogel (PTX-mPECT NP/α-CD(gel)) was prepared by self-assembly of inclusion complexes based on PTX-loaded mPECT (methoxy poly(ethylene glycol)-b-poly(ε-caprolactone-co-1,4,8-trioxa[4.6]spiro-9-un-decanone)) nanoparticles (PTX-mPECT NPs) and α-cyclodextrin (α-CD). Paclitaxel (PTX) was chosen as a hydrophobic drug encapsulated into mPECT NPs. Then, gelation occurred when the aqueous solution of α-CD was added to the PTX-mPECT NPs aqueous dispersion within several seconds after stirring...
February 10, 2017: Biomaterials Science
Seung Hyuk Im, Chang Yong Kim, Youngmee Jung, Yangsoo Jang, Soo Hyun Kim
Monofilaments such as those consisting of polyamide (PA), polydioxanone (PDS), and poly(vinylidene fluoride) (PVDF), have been commonly used in various industries. However, most are non-biodegradable, which is unfavorable for many biomedical applications. Although biodegradable polymers offer significant benefits, they are still limited by their weak mechanical properties, which is an obstacle for use as a biomaterial that requires high strength. To overcome the current limitations of biodegradable monofilaments, a novel solid-state drawing (SSD) process was designed to significantly improve the mechanical properties of both PA and poly(l-lactic acid) (PLLA) monofilaments in this study...
February 10, 2017: Biomaterials Science
C Freese, L Anspach, R C Deller, S-J Richards, M I Gibson, C J Kirkpatrick, R E Unger
PEGylated gold nanoparticles (AuNPs) have an extended circulation time after intravenous injection in vivo and exhibit favorable properties for biosensing, diagnostic imaging, and cancer treatment. No impact of PEGylated AuNPs on the barrier forming properties of endothelial cells (ECs) has been reported, but recent studies demonstrated that unexpected effects on erythrocytes are observed. Almost all studies to date have been with static-cultured ECs. Herein, ECs maintained under physiological cyclic stretch and flow conditions and used to generate a blood-brain barrier model were exposed to 20 nm PEGylated AuNPs...
February 10, 2017: Biomaterials Science
Shao-Lu Li, Yingqin Hou, Yali Hu, Jin Yu, Wei Wei, Hua Lu
We describe here the synthesis and cell-selective delivery of a cationic Pt(iv)-backboned prodrug-like polymer P(DSP-DAEP). P(DSP-DAEP) features excellent aqueous solubility, unusually high (44.5%) drug loading, can be rapidly reduced to release the active cisplatin, and is more potent than its small molecular Pt(iv) precursor DSP. P(DSP-DAEP) can be formulated with an oppositely charged methoxyl poly(ethylene glycol)-block-poly(l-phosphotyrosine) (mPEG-b-PpY) to afford a polyion micelle (Pt-PIC) by taking advantage of polyelectrolyte coacervation...
February 9, 2017: Biomaterials Science
Han Shih, Hung-Yi Liu, Chien-Chi Lin
Hydrogels immobilized with biomimetic peptides have been used widely for tissue engineering and drug delivery applications. Photopolymerization has been among the most commonly used techniques to fabricate peptide-immobilized hydrogels as it offers rapid and robust peptide immobilization within a crosslinked hydrogel network. Both chain-growth and step-growth photopolymerizations can be used to immobilize peptides within covalently crosslinked hydrogels. A previously developed visible light mediated step-growth thiol-norbornene gelation scheme has demonstrated efficient crosslinking of hydrogels composed of an inert poly(ethylene glycol)-norbornene (PEGNB) macromer and a small molecular weight bis-thiol linker, such as dithiothreitol (DTT)...
February 8, 2017: Biomaterials Science
Huangyong Jiang, Dong Chen, Dongbo Guo, Nan Wang, Yue Su, Xin Jin, Gangsheng Tong, Xinyuan Zhu
Novel "zwitterionic" gold nanorods (Au NRs) were constructed through a facile ligand exchange process between cetyltrimethylammonium bromide (CTAB)-Au NRs and the zwitterionic block polymer {poly(2-methacryloyloxyethyl phosohorylcholine)-b-poly(lipoic methacrylate) (pMPC-b-pLA)}. In vitro, they exhibited low dark cytotoxicity and a high therapeutic efficacy to cancer cells. Their blood circulation half-life in vivo (t1/2, ∼10 h) was 20-fold longer than that of CTAB-Au NRs (t1/2, <30 min). After intravenous administration, they accumulated in tumour sites via an enhanced permeability and retention (EPR) effect and enabled destruction of human xenograft tumours in mice after exposure of the tumour location to NIR laser irradiation at 808 nm...
February 6, 2017: Biomaterials Science
M Schumacher, L Reither, J Thomas, M Kampschulte, U Gbureck, A Lode, M Gelinsky
Calcium phosphate (CaP) bone cements are widely used for the treatment of bone defects and have been proposed to serve as a delivery platform for therapeutic drugs, proteins and growth factors into the defect region. However, they lack sufficient porosity to allow immediate bone ingrowth and thus foster rapid integration into the bone tissue. In this study we investigated a composite prepared from a hydroxyapatite forming bone cement and mesoporous bioactive glass (MBG) granules as a potential carrier for biologically active proteins...
February 3, 2017: Biomaterials Science
Chao Wei, Yan Zhang, Zhongchen Song, Yiru Xia, Heng Xu, Meidong Lang
Stimuli-responsive nanocarriers have been limited for bench-to-bedside translation mainly because the stimuli sensitivity and responsive rate are not high enough to ensure sufficient drug concentration at the target sites for superior therapeutic benefits. Herein, we reported an enhanced bioreduction-responsive and biodegradable nanocarrier based on the amphiphilic poly(ester urethane) copolymers (PAUR-SeSe) bearing multiple diselenide groups on the backbone. The copolymer could spontaneously self-assemble into stable micelles in aqueous medium with an average diameter of 68 nm, which could be rapidly disassembled in a reductive environment as a result of the reduction-triggered cleavage of diselenide groups...
February 3, 2017: Biomaterials Science
Xiangqian Jia, Qiuju Han, Zihua Wang, Yixia Qian, Yunhong Jia, Weizhi Wang, Zhiyuan Hu
Aminopeptidase N (APN/CD13) is closely related to the growth of cancers and is suggested as a suitable target for anti-cancer therapy. Based on the "one-bead-one-compound" (OBOC) approach on a microarray device, we screened out a novel affinity peptide LN (YEVGHRC). It was determined that LN could specifically recognize and bind to APN. Moreover, LN-functionalized liposomes (LN-LS) could achieve efficient nano-encapsulated drug delivery under APN-overexpressing tumor conditions in vitro and in vivo. We expect that LN-LS could provide a new strategy for APN-positive tumor diagnosis and therapy...
January 31, 2017: Biomaterials Science
Shabi Abbas Zaidi
Molecular imprinted polymerization is considered one of the most useful preparation strategies to obtain highly selective polymeric materials called molecular imprinted polymers (MIPs). It has attracted a tremendous amount of interest in the last decade. Consequently, MIPs have been employed in a variety of applications including chromatographic separation, sensors and biosensors fabrication, drug delivery, proteomic analysis and plastic antibody synthesis, etc. The hybridization of the excellent features of MIPs and nanomaterials has further fueled the intensity of research in this area...
January 31, 2017: Biomaterials Science
Rui Qu, Hejin Shi, Ruolin Wang, Tangjian Cheng, Rujiang Ma, Yingli An, Linqi Shi
Artificial enzymes are widely investigated to mimic the active center and the recognition center of natural enzymes. The active center is responsible for the catalytic activity of enzymes, and the recognition center provides enzymes with specificity. Most of the previous studies on artificial enzymes preferred to solve the problem of activity rather than specificity due to the complexity of the enzyme structures related to substrate recognition. Inspired by the multilevel structures of enzymes and the unique net-structures of hydrogels, hemin-micelles immobilized in alginate hydrogels (HM-AH) were constructed by multistep self-assembly...
January 31, 2017: Biomaterials Science
T Cavoue, H Bounou Abassi, M Vayssade, A Nguyen Van Nhien, I-K Kang, G-W Kwon, G Pourceau, P Dubot, S Abbad Andaloussi, D-L Versace
Nosocomial infections are often induced by the presence of pathogenic organisms on the surface of medical devices or hospital equipment. Chemical modifications of the surface are recognized as efficient strategies to prevent bacterial adhesion but they may have a negative impact on the material's interaction with living tissues. Here we have developed a photoactivated method for the modification of titanium substrates. A photoinduced technique employing a grafting-onto process has been successfully performed to covalently anchor an imidazolium-derivative siloxane onto titanium surfaces...
January 31, 2017: Biomaterials Science
Chuan Ma, Leilei Shi, Yu Huang, Lingyue Shen, Hao Peng, Xinyuan Zhu, Guoyu Zhou
Correction for 'Nanoparticle delivery of Wnt-1 siRNA enhances photodynamic therapy by inhibiting epithelial-mesenchymal transition for oral cancer' by Chuan Ma, et al., Biomater. Sci., 2017, DOI: 10.1039/c6bm00833j.
January 30, 2017: Biomaterials Science
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