Abstract：
:Hydrogel microspheres with the capability to interact with charged species such as various drugs by ion-exchange processes are useful in a variety of biomedical applications. Such systems have been developed to allow active loading of the microsphere with chemotherapeutic agents in the hospital pharmacy for subsequent locoregional therapy of tumours in the liver by drug-eluting bead chemoembolization (DEB-TACE). A variety of microspherical embolisation systems have been described, all based upon hydrogels bearing anionic functionalities to allow interaction with cationically charged drugs. We have recently prepared a series of microspheres bearing cationic functionality and have observed some unusual behaviour induced by phase-separation that occurs during the synthesis of the microspheres. The phase-separation results in the core of the microsphere being enriched in cationic polymer component compared to the outer polyvinyl alcohol (PVA)-based phase. For certain formulations, subsequent swelling in water results in the PVA-rich skins separating from the charged cores. Ion-exchange interactions with model compounds bearing multi-anionic groups create differential contraction of the charged core relative to the skin, resulting in an unusual "golf-ball" appearance to the surface of the microspheres. STATEMENT OF SIGNIFICANCE:The authors believe that the unusual behaviour of the microspheres reported in this paper is the first observation of its kind resulting from phase-separation during synthesis. This could have novel applications in drug delivery for systems that can respond by shedding their skin or altering the surface area to volume ratio upon loading a drug.
journal_name
Acta Biomaterjournal_title
Acta biomaterialiaauthors
Heaysman CL,Philips GJ,Lloyd AW,Lewis ALdoi
10.1016/j.actbio.2017.02.013subject
Has Abstractpub_date
2017-04-15 00:00:00pages
190-198eissn
1742-7061issn
1878-7568pii
S1742-7061(17)30119-8journal_volume
53pub_type
杂志文章abstract：:The control of cell behaviour through material geometry is appealing as it avoids the requirement for complex chemical surface modifications. Significant advances in new technologies have been made to the development of polymeric biomaterials with controlled geometry and physico-chemical properties. Solution blow spin...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2017.01.020
更新日期：2017-03-15 00:00:00
abstract：:Recently, a significant amount of effort has been dedicated to understanding factors that influence the functionality of bio-electronic sensors and to development of novel coating technologies for modifying biosensor surfaces. Due to its well-known biocompatibility, alginate hydrogel (HG) has been used as a coating ma...
journal_title：Acta biomaterialia
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doi：10.1016/j.actbio.2009.07.034
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abstract：:Scaffold permeability is a key parameter combining geometrical features such as pore shape, size and interconnectivity, porosity and specific surface area. It can influence the success of bone tissue engineering scaffolds, by affecting oxygen and nutrient transport, cell seeding efficiency, in vitro three-dimensional ...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2011.12.021
更新日期：2012-04-01 00:00:00
abstract：:Hydroxyapatite coatings (HACs) with a low crystalline state were prepared using the plasma spraying process followed by hermetic autoclaving hydrothermal treatment at 100, 150 and 200 degrees C. Experimental evidence confirmed that the HACs became significantly crystallized and the content of amorphous calcium phospha...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2009.03.014
更新日期：2009-09-01 00:00:00
abstract：:A series of poly(2-hydroxyethyl methacrylate) (pHEMA) hydrogels containing cross-linked β-cyclodextrin-hyaluronan (β-CD-crHA), with tear protein adsorption resistance and sustained drug delivery, were developed as contact lens materials for eye diseases. β-CD-HA was synthesized from aminated β-CD and HA and then cross...
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pub_type： 杂志文章
doi：10.1016/j.actbio.2020.04.002
更新日期：2020-07-01 00:00:00
abstract：:Engineered skeletal muscle grafts may be employed in various applications including the treatment of volumetric muscle loss (VML) and pharmacological drug screening. To recapitulate the well-defined structure of native muscle, tensile strains have been applied to the grafts. In this study, we cultured C2C12 murine myo...
journal_title：Acta biomaterialia
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doi：10.1016/j.actbio.2019.06.024
更新日期：2019-08-01 00:00:00
abstract：:The biodegradable metallic devices undergo stress/strain-induced corrosion when they are used for load-bearing applications. The stress/strain induced-corrosion behavior causes differences in corrosion rate, corrosion morphology, strain distribution and mechanical performance of the devices. One representative example...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2020.06.028
更新日期：2020-09-01 00:00:00
abstract：:Aortic aneurysm is a leading cause of death in adults, often taking lives without any premonitory signs or symptoms. Adverse clinical outcomes of aortic aneurysm are preventable by elective surgical repair; however, identifying at-risk individuals is difficult. The objective of this study was to perform a predictive b...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2013.07.044
更新日期：2013-12-01 00:00:00
abstract：UNLABELLED:Rapid vascularization of bone graft substitutes upon implantation is one of the most important challenges to overcome in order to achieve successful regeneration of large, critical-size bone defects. One strategy for stimulating vascularization during the regeneration process is to create a hypoxic microenvi...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2016.03.031
更新日期：2016-05-01 00:00:00
abstract：:Monodispersed strontium containing bioactive glass nanoparticles (Sr-BGNPs) with two compositions were synthesised, through a modified sol-gel Stöber process, wherein silica nanoparticles (SiO2-NPs) were formed prior to incorporation of calcium and strontium, with diameters of 90 ± 10 nm. The osteogenic response of a ...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2017.11.008
更新日期：2018-01-15 00:00:00
abstract：:Biomaterial-mediated controlled release of soluble signaling molecules is a tissue engineering approach to spatially control processes of inflammation, microvascular remodeling and host cell recruitment, and to generate biochemical gradients in vivo. Lipid mediators, such as sphingosine 1-phosphate (S1P), are recogniz...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2014.08.007
更新日期：2014-11-01 00:00:00
abstract：:Two classes of amphiphilic macromolecules were evaluated for drug delivery applications: those that exist as unimolecular micelles and those that self-assemble in aqueous solution to form micelles. This study compares the poly(ethylene glycol) (PEG) chain length and density that constitute the corona of both classes. ...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2008.10.019
更新日期：2009-03-01 00:00:00
abstract：:A series of Sr-substituted hydroxyapatites, (Sr(x)Ca(1-)(x))(5)(PO(4))(3)OH, where x=0.00, 0.25, 0.50, 0.75 and 1.00, were made by a standard wet chemical route and investigated using X-ray diffraction (XRD), Rietveld refinement and Raman spectroscopy. We report apatites manufactured by two synthesis routes under 90 d...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2008.04.018
更新日期：2008-09-01 00:00:00
abstract：UNLABELLED:Quercetin (3,3',4',5,7-pentahydroxy-flavone) is a flavonoid known for its pharmacological activities, which include antioxidant and anti-inflammatory properties, as well as possible beneficial action on diseases involving bone loss. In this work, we explored the possibility to functionalize hydroxyapatite (H...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2015.12.013
更新日期：2016-03-01 00:00:00
abstract：UNLABELLED:A new a biocompatible Ti42Zr40Ta3Si15 (atomic %) porous bulk glassy alloy was produced by combination of rapid solidification and powder metallurgy techniques. Amorphous alloy ribbons were fabricated by melt spinning, i.e. extremely fast quenching the molten alloy with 10(6)K/s from T=1973K down to room temp...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2016.03.020
更新日期：2016-05-01 00:00:00
abstract：:Throughout the process of aging, dynamic changes of bone material, micro- and macro-architecture result in a loss of strength and therefore in an increased likelihood of fragility fractures. To date, precise contributions of age-related changes in bone (re)modeling and (de)mineralization dynamics to this fragility inc...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2020.02.007
更新日期：2020-04-01 00:00:00
abstract：UNLABELLED:The generation of tissue-engineered blood vessel substitutes remains an ongoing challenge for cardiovascular tissue engineering. Full biocompatibility and immediate availability have emerged as central issues for clinical use. To address these issues, we developed a technique that allows the generation of hi...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2015.10.012
更新日期：2016-01-01 00:00:00
abstract：:Recent studies indicate that there is a great demand to optimize pure Zn with tunable degradation rates and more desirable biocompatibility as orthopedic implants. Metal matrix composite (MMC) can be a promising approach for this purpose. In this study, MMC with pure Zn as a matrix and hydroxyapatite (HA) as reinforce...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2018.03.007
更新日期：2018-04-15 00:00:00
abstract：:The main objective of this study was to investigate calcium phosphate (CaP) coatings on Ti6Al4V substrates by using the biomimetic technique. To this purpose, a new solution was developed to coat CaP on Ti6Al4V alloy substrates. The newly formulated body fluid (Lac-SBF) contained appropriate amounts of sodium lactate ...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2009.12.013
更新日期：2010-06-01 00:00:00
abstract：:Myocardial infarction (MI) leads to the loss of cardiomyocytes, left ventricle (LV) dilation, and cardiac dysfunction, eventually developing into heart failure. Most of the strategies for MI therapy require biomaterials that can support tissue regeneration. In this study, we hypothesized that the extracellular matrix ...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2019.01.022
更新日期：2019-03-01 00:00:00
abstract：:β-Cyclodextrin can form inclusion complex with a series of guest molecules including phenyl moieties, and has gained considerable popularity in the study of supramolecular nanostructure. In this study, a biodegradable nanocomplex (HA(CD)-4Phe4 nanocomplex) was developed from β-cyclodextrin grafted hyaluronic acid (HA)...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2017.08.036
更新日期：2017-10-15 00:00:00
abstract：:Hydrogels have been recognized as crucial biomaterials in the field of tissue engineering, regenerative medicine, and drug delivery applications due to their specific characteristics. These biomaterials benefit from retaining a large amount of water, effective mass transfer, similarity to natural tissues and the abili...
journal_title：Acta biomaterialia
pub_type： 杂志文章,评审
doi：10.1016/j.actbio.2017.07.028
更新日期：2017-10-15 00:00:00
abstract：:The use of biodegradable beta-tricalcium phosphate (β-TCP) scaffolds holds great promise for bone tissue engineering. However, the effects of β-TCP on bone and endothelial cells are not fully understood. This study aimed to investigate cell proliferation and differentiation of mono- or co-cultured human-bone-marrow-de...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2012.08.008
更新日期：2013-01-01 00:00:00
abstract：:Cartilage lacks basic repair mechanisms and thus surgical interventions are necessary to treat lesions. Minimally-invasive arthroscopic procedures require the development of injectable biomaterials to support chondrogenesis of implanted cells. However, most cartilage tissue engineering approaches rely on pre-culture o...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2019.09.017
更新日期：2019-11-01 00:00:00
abstract：:In this study, one-step enzyme-mediated preparation of a multi-functional injectable hyaluronic-acid-based hydrogel system is reported. Hydrogel was formed through the in situ coupling of phenol moieties by horseradish peroxidase (HRP) and hydrogen peroxide (H2O2), and bioactive peptides were simultaneously conjugated...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2014.02.022
更新日期：2014-06-01 00:00:00
abstract：:The titanium dioxide (TiO(2)) nanotube surface enables significantly accelerated osteoblast adhesion and exhibits strong bonding with bone. We prepared various sizes (30-100 nm diameter) of titanium dioxide (TiO(2)) nanotubes on titanium substrates by anodization and investigated the osteoblast cellular behavior in re...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2009.05.008
更新日期：2009-10-01 00:00:00
abstract：:Metal-binding peptides have attracted attention for their usefulness in biomineralization processes. In this work screening of high affinity peptides against ZnO was performed using a combinatorial library approach with a peptide array and computational analysis. The computationally assisted peptide screening and desi...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2009.12.025
更新日期：2010-06-01 00:00:00
abstract：:An important requirement for a bone tissue engineering scaffold is a stiffness gradient that mimics that of native bone. Such scaffolds can be achieved by controlling their structure and porosity and are termed functionally graded scaffolds (FGS). Currently, the main challenges in FGS fabrication include the iterative...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2010.09.024
更新日期：2011-02-01 00:00:00
abstract：:In order to expand the properties and applications of aliphatic absorbable polyesters, a new biodegradable block copolymer family, poly(ester amide)-b-poly(ε-caprolactone) (PEA-b-PCL), was synthesized and characterized. These copolymers were synthesized by first preparing l-phenylalanine-based poly(ester amide) macroi...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2012.07.027
更新日期：2012-12-01 00:00:00
abstract：:Biocompatible polymer solutions that can crosslink in situ following injection to form stable hydrogels are of interest as depots for sustained delivery of therapeutic factors or cells, and as scaffolds for regenerative medicine. Here, injectable self-gelling alginate formulations obtained by mixing alginate microsphe...
journal_title：Acta biomaterialia
pub_type： 杂志文章
doi：10.1016/j.actbio.2008.11.019
更新日期：2009-05-01 00:00:00
