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| 1 | 3D bioprinting for biomedical devices and tissue engineering: A review of recent trends and advances显示文摘3D printing,an additive manufacturing based technology for precise 3D construction,is currently widely employed to enhance applicability and function of cell laden scaffolds.Research on novel compatible biomaterials for bioprinting exhibiting fast crosslinking properties is an essential prerequisite toward advancing 3D printing applications in tissue engineering.Printability to improve fabrication process and cell encapsulation are two of the main factors to be considered in development of 3D bioprinting.Other important factors include but are not limited to printing fidelity,stability,crosslinking time,biocompatibility,cell encapsulation and proliferation,shear-thinning properties,and mechanical properties such as mechanical strength and elasticity.In this review,we recite recent promising advances in bioink development as well as bioprinting methods.Also,an effort has been made to include studies with diverse types of crosslinking methods such as photo,chemical and ultraviolet(UV).We also propose the challenges and future outlook of 3D bioprinting application in medical sciences and discuss the high performance bioinks. | Soroosh Derakhshanfar Rene Mbeleck Kaige Xu Xingying Zhang Wen Zhong Malcolm Xing | 2018 | Bioactive Materials2018，3，2： | 21 |
| 2 | 3D printing of bone tissue engineering scaffolds显示文摘Tissue engineering is promising in realizing successful treatments of human body tissue loss that current methods cannot treat well or achieve satisfactory clinical outcomes.In scaffold-based bone tissue engineering,a high performance scaffold underpins the success of a bone tissue engineering strategy and a major direction in the field is to produce bone tissue engineering scaffolds with desirable shape,structural,physical,chemical and biological features for enhanced biological performance and for regenerating complex bone tissues.Three-dimensional(3D)printing can produce customized scaffolds that are highly desirable for bone tissue engineering.The enormous interest in 3D printing and 3D printed objects by the science,engineering and medical communities has led to various developments of the 3D printing technology and wide investigations of 3D printed products in many industries,including biomedical engineering,over the past decade.It is now possible to create novel bone tissue engineering scaffolds with customized shape,architecture,favorable macro-micro structure,wettability,mechanical strength and cellular responses.This article provides a concise review of recent advances in the R&D of 3D printing of bone tissue engineering scaffolds.It also presents our philosophy and research in the designing and fabrication of bone tissue engineering scaffolds through 3D printing. | Chong Wang Wei Huang Yu Zhou Libing He Zhi He Ziling Chen Xiao He Shuo Tian Jiaming Liao Bingheng Lu Yen Wei Min Wang | 2020 | Bioactive Materials2020，5，1： | 20 |
| 3 | Bioactive hydrogels for bone regeneration显示文摘Bone self-healing is limited and generally requires external intervention to augment bone repair and regeneration.While traditional methods for repairing bone defects such as autografts,allografts,and xenografts have been widely used,they all have corresponding disadvantages,thus limiting their clinical use.Despite the development of a variety of biomaterials,including metal implants,calcium phosphate cements(CPC),hydroxyapatite,etc.,the desired therapeutic effect is not fully achieved.Currently,polymeric scaffolds,particularly hydrogels,are of interest and their unique configurations and tunable physicochemical properties have been extensively studied.This review will focus on the applications of various cutting-edge bioactive hydrogels systems in bone regeneration,as well as their advantages and limitations.We will examine the composition and defects of the bone,discuss the current biomaterials for bone regeneration,and classify recently developed polymeric materials for hydrogel synthesis.We will also elaborate on the properties of desirable hydrogels as well as the fabrication techniques and different delivery strategies.Finally,the existing challenges,considerations,and the future prospective of hydrogels in bone regeneration will be outlined. | Xin Bai Mingzhu Gao Sahla Syed Jerry Zhuang Xiaoyang Xu Xue-Qing Zhang | 2018 | Bioactive Materials2018，3，4： | 15 |
| 4 | A high strength, anti-fouling, self-healable, and thermoplastic supramolecular polymer hydrogel with low fibrotic response显示文摘The fibrotic response plays an important role in the performance and longevity of implantable devices. Thus, development of effective anti-inflammatory and anti-fibrosis biomaterial implants has become an urgent task. In this work, we developed a novel supramolecular polymer hydrogel through the copolymerization of N-acryloyl glycinamide(NAGA) and carboxybetaine acrylamide(CBAA) in the absence of any chemical crosslinker, which the mechanical properties being tunable through changing the monomer concentration and the monomer ratio over a broad scope. The hydrogel possessed the superior mechanical performances: high tensile strength(~1.13 MPa), large stretchability(~1200%), and excellent compressive strength(~9 MPa) at high monomer concentration and NAGA/CBAA ratio. Introduction of CBAA could promote the self-healability, thermoplasticity of suparmolecular polymer hydrogels at lower temperatures, meanwhile dramatically improving anti-fouling property.Histological analysis and in vitro cytotoxicity assays testified the excellent biocompatibility of the hydrogel. This high strength supramolecular polymer hydrogel with integrated multiple functions holds promising potentials as a scaffold biomaterial for treating degenerated soft supporting tissues. | WANG HongBo LI HaoFei WU YuanHao YANG JianHai LIU WenGuang | 2019 | Science China(Technological Sciences)2019，62，4： | 11 |
| 5 | Effects of miR-219/miR-338 on microglia and astrocyte behaviors and astrocyte-oligodendrocyte precursor cell interactions显示文摘MiR-219 and miR-338(miR-219/miR-338)are oligodendrocyte-specific microRNAs.The overexpression of these miRs in oligodendrocyte precursor cells promotes their differentiation and maturation into oligodendrocytes,which may enhance axonal remyelination after nerve injuries in the central nervous system(CNS).As such,the delivery of miR-219/miR-338 to the CNS to promote oligodendrocyte precursor cell differentiation,maturation and myelination could be a promising approach for nerve repair.However,nerve injuries in the CNS also involve other cell types,such as microglia and astrocytes.Herein,we investigated the effects of miR-219/miR-338 treatment on microglia and astrocytes in vitro and in vivo.We found that miR-219/miR-338 diminished microglial expression of pro-inflammatory cytokines and suppressed astrocyte activation.In addition,we showed that miR-219/miR-338 enhanced oligodendrocyte precursor cell differentiation and maturation in a scratch assay paradigm that re-created a nerve injury condition in vitro.Collectively,our results suggest miR-219/miR-338 as a promising treatment for axonal remyelination in the CNS following nerve injuries.All experimental procedures were approved by the Institutional Animal Care and Use Committee(IACUC),Nanyang Technological University(approval No.A0309 and A0333)on April 27,2016 and October 8,2016. | Lan Huong Nguyen William Ong Kai Wang Mingfeng Wang Dean Nizetic Sing Yian Chew | 2020 | Neural Regeneration Research2020，15，4： | 11 |
| 6 | The fabrication of biomimetic biphasic CAN-PAC hydrogel with a seamless interfacial layer applied in osteochondral defect repair显示文摘Cartilage tissue engineering based on biomimetic scaffolds has become a rapidly developing strategy for repairing cartilage defects. In this study, a biphasic CAN-PAC hydrogel for osteochondral defect(OCD)regeneration was fabricated based on the density difference between the two layers via a thermally reactive,rapid cross-linking method. The upper hydrogel was cross-linked by CSMA and NIPAm, and the lower hydrogel was composed of PECDA, AAm and PEGDA. The interface between the two layers was first grafted by the physical cross-linking of calcium gluconate and alginate, followed by the chemical cross-linking of the carbon-carbon double bonds in the other components. The pore sizes of the upper and lower hydrogels were ~ 187.4 and ~ 112.6 μm, respectively. The moduli of the upper and lower hydrogels were ~ 0.065 and~ 0.261 MPa. This prepared bilayer hydrogel exhibited the characteristics of mimetic composition, mimetic structure and mimetic stiffness, which provided a microenvironment for sustaining cell attachment and viability. Meanwhile, the biodegradability and biocompatibility of the CAN-PAC hydrogel were examined in vivo. Furthermore, an osteochondral defect model was developed in rabbits, and the bilayer hydrogels were implanted into the defect. The regenerated tissues in the bilayer hydrogel group exhibited new translucent cartilage and repaired subchondral bone, indicating that the hydrogel can enhance the repair of osteochondral defects. | Jinfeng Liao Taoran Tian Sirong Shi Xueping Xie Quanquan Ma Guo Li Yunfeng Lin | 2017 | Bone Research2017，5，2： | 10 |
| 7 | Hydrogel as a bioactive material to regulate stem cell fate显示文摘The encapsulation of stem cells in a hydrogel substrate provides a promising future in biomedical applications.However,communications between hydrogels and stem cells is complicated;various factors such as porosity,different polymer types,stiffness,compatibility and degradation will lead to stem cell survival or death.Hydrogels mimic the three-dimensional extracellular matrix to provide a friendly environment for stem cells.On the other hand,stem cells can sense the surroundings to make the next progression,stretching out,proliferating or just to remain.As such,understanding the correlation between stem cells and hydrogels is crucial.In this Review,we first discuss the varying types of the hydrogels and stem cells,which are most commonly used in the biomedical fields and further investigate how hydrogels interact with stem cells from the perspective of their biomedical application,while providing insights into the design and development of hydrogels for drug delivery,tissue engineering and regenerative medicine purpose.In addition,we compare the results such as stiffness,degradation time and pore size as well as peptide types of hydrogels from respected journals.We also discussed most recently magnificent materials and their effects to regulate stem cell fate. | Yung-Hao Tsou Joe Khoneisser Ping-Chun Huang Xiaoyang Xu | 2016 | Bioactive Materials2016，1，1： | 9 |
| 8 | A bioinspired high-modulus mineral hydrogel binder for improving the cycling stability of microsized silicon particle-based lithium-ion battery显示文摘Silicon with high specific capacity is deemed an ideal anode material for lithium ion batteries,which,however suffers from low cycling life due to its dramatic volume changes.Water-soluble polymer binders recently gain increasing attention by providing an eco-friendly and low-cost way in improving the cycling stability of Si-based anodes.Herein,a novel bioinspired supramolecular mineral hydrogel binder consisting of polyacrylic acid (PAA) physically crosslinked with amorphous calcium carbonate (ACC) nanoparticles is designed for high-performance anodes made from low-cost microsized Si particles.Owing to its organic-inorganic hydrophilic nature,ACC-PAA hybrid binder exhibits the reported highest modulus (~22 GPa) for polymer binders in electrolyte,even higher than lithiated Si species (Li15Si4,~12 GPa).Together with its excellent adhesion and electrochemical stability,ACC-PAA binder can effectively suppress the pulverization of Si particles and maintain the mechanical integrity of electrodes during cycling.Therefore,even with a low binder content,the anode still shows an initial discharge capacity of 2,973 mAh·g^-1 and Coulombic efficiency of 81.5%,and retains 75% at a current density of 600 mA·g^-1 after 100 cycles.The present organic-inorganic hybrid mineral binder may open a new approach for designing more effective polymer binders for Si-based lithium-ion batteries. | Meng Tian Xiao Chen Shengtong Sun Dong Yang Peiyi Wu | 2019 | Nano Research2019，12，5： | 9 |
| 9 | Effect of Preparation Methods on Mechanical Properties of PVA/HA Composite Hydrogel显示文摘Poly(vinyl alcohol) (PVA)/hydroxyapatite (HA) composite hydrogel specimens were prepared with 15% PVA and 1%,2%, 3%, 4% and 5% HA by repeated freezing-thawing. The tests of static and dynamic mechanical properties were carried out todiscuss the influence of different contents of HA and freezing-thawing cycles on the mechanical properties of PVA/HA compositehydrogel. The results of static mechanical tests showed that the PVA/HA composite hydrogel with 3% HA and ninefreezing-thawing cycles had excellent stress relaxation properties, higher relaxation ratio, lower stress equilibrium value andpresented better properties of creep and recovery. The results of dynamic mechanical test showed that the PVA/HA compositehydrogel with nine freezing-thawing cycles had higher storage modulus and loss modulus, so was the PVA/HA compositehydrogel with 3% HA. | Dekun Zhang~1, Junjie Duan~1, Dagang Wang~2, Shirong Ge~2 1. School of Materials Science and Engineering, China University of Mining and Technology Xuzhou 221116, P. R. China 2. School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China | 2010 | Journal of Bionic Engineering2010，7，3： | 8 |
| 10 | Recent progress in 4D printing of stimuli-responsive polymeric materials显示文摘4D printing is proposed based on the additive manufacturing of stimuli-responsive materials and structures,which can realize shape changing upon external stimuli.This article reviews the 4D printing methods and actuating performances of 4D printing structures based on shape memory polymers,hydrogels,liquid crystal elastomers,and electroactive polymers.This article shows that the shape morphing properties of single materials are limited,while 4D printing of composites can integrate the various driving modes of different smart materials.In the end,challenges facing 4D printing such as broadening the scope of smart materials,improving printing processes,the compatibility of printing different materials have been discussed. | MA SuQian ZHANG YunPeng WANG Meng LIANG YunHong REN Lei REN LuQuan | 2020 | Science China(Technological Sciences)2020，63，4： | 7 |
| 11 | Doxycycline and hydroxypropyl-b-cyclodextrin complex in poloxamer thermal sensitive hydrogel for ophthalmic delivery显示文摘The present study aimed to prepare a chemically and physically stable formulation of doxycycline(Doxy)in an in situ thermally sensitive hydrogel for ophthalmic delivery.An inclusion complex of Doxy and hydroxypropyl-b-cyclodextrin(HP-b-CD)was first developed to increase the stability of Doxy in aqueous solution.The physical characteristics(phase solubility profiles,thermal analysis,X-ray powder diffractograms and infrared spectra)of the Doxy-HP-b-CD inclusion complex indicated the formation of a stable 1:1 complex.Poloxamers P407(16–22%)and P188(0–5%)were mixed to obtain a hydrogel with an appropriate gelation temperature for opthalmic use.Formulation of the inclusion complex in the poloxamer hydrogel exhibited a suitable gelation temperature(33.3℃)after dilution with simulated tear fluid(Gel:STF=40:7,v/v).The release of Doxy from the poloxamer hydrogel followed a zero order equation suggesting it occurs through corrosion of the poloxamer hydrogel.Stability studies demonstrated that the inclusion of Doxy by HP-b-CD markedly improved its stability in aqueous solution both at 8 and 401C.This formulation of a doxycycline-HP-b-CD inclusion complex in an in situ thermally sensitive poloxamer hydrogel represents a potentially effective ophthalmic Doxy delivery system. | Zi-xin He Zhou-hua Wang Hao-hao Zhang Xin Pan Wen-ru Su Dan Liang Chuan-bin Wu | 2011 | Acta Pharmaceutica Sinica B2011，1，4： | 7 |
| 12 | Collagen/hyaluronan based hydrogels releasing sulfated hyaluronan improve dermal wound healing in diabetic mice via reducing inflammatory macrophage activity显示文摘Sustained inflammation associated with dysregulated macrophage activation prevents tissue formation and healing of chronic wounds.Control of inflammation and immune cell functions thus represents a promising approach in the development of advanced therapeutic strategies.Here we describe immunomodulatory hyaluronan/collagen(HA-AC/coll)-based hydrogels containing high-sulfated hyaluronan(sHA)as immunoregulatory component for the modulation of inflammatory macrophage activities in disturbed wound healing.Solute sHA downregulates inflammatory activities of bone marrow-derived and tissue-resident macrophages in vitro.This further affects macrophage-mediated pro-inflammatory activation of skin cells as shown in skin ex-vivo cultures.In a mouse model of acute skin inflammation,intradermal injection of sHA downregulates the inflammatory processes in the skin.This is associated with the promotion of an anti-inflammatory gene signature in skin macrophages indicating a shift of their activation profile.For in vivo translation,we designed HA-AC/coll hydrogels allowing delivery of sHA into wounds over a period of at least one week.Their immunoregulatory capacity was analyzed in a translational experimental approach in skin wounds of diabetic db/db mice,an established model for disturbed wound healing.The sHA-releasing hydrogels improved defective tissue repair with reduced inflammation,augmented pro-regenerative macrophage activation,increased vascularization,and accelerated new tissue formation and wound closure. | Sophia Hauck Paula Zager Norbert Halfter Elke Wandel Marta Torregrossa Ainur Kakpenova Sandra Rother Michelle Ordieres Susann Räthel Albrecht Berg Stephanie Möller Matthias Schnabelrauch Jan C.Simon Vera Hintze Sandra Franz | 2021 | Bioactive Materials2021，6，12： | 7 |
| 13 | Synergistic therapy of magnetism-responsive hydrogel for soft tissue injuries显示文摘Soft tissue injury is very common and associated with pain,tissue swelling and even malformation if not treated on time.Treating methods include cryotherapy,electrical therapy,ultrasound therapy and anti-inflammatory drug,but none of them is completely satisfying.In this work,for a better therapeutic effect,drug therapy and pulsed electromagnetic field(PEMF)therapy were combined.We constructed a drug delivery system using the tetra-PEG/agar hydrogel(PA).By incorporating Fe3O4 NPs into the hydrogel network,a magnetism-responsive property was achieved in the system.The cytotoxicity and in vivo study showed a good biocompatibility of the PA/Fe3O4 hydrogel.A magnetism-controlled release was attained by the incorporation of Fe3O4.Finally,in vivo study showed a better performance of the DS-loaded PA/Fe3O4 compared with the commercially available DS ointment regarding the recovery of the injured soft tissue.Therefore,this magnetism-responsive hydrogel may represent a promising alternative to treat soft tissue injury. | Lining Zhang Xiuqin Zuo Shengjie Li Mi Sun Huimin Xie Kai Zhang Jikun Zhou Liyun Che Junxuan Ma Zishan Jia Fei Yang | 2019 | Bioactive Materials2019，4，1： | 7 |
| 14 | Injectable peptide hydrogel as intraperitoneal triptolide depot for the treatment of orthotopic hepatocellular carcinoma显示文摘Chemotherapy is among the limited choices approved for the treatment of hepatocellular carcinoma(HCC) at intermediate and advanced stages. Preferential and prolonged drug exposure in diseased sites is required to maximize the therapeutic index of the drug. Here, we report an injectable supramolecular peptide hydrogel as an intraperitoneal depot for localized and sustained release of triptolide for the treatment of orthotopic HCC. We chose peptide amphiphile C16-GNNQQNYKD-OH-based nanofibers as gelators and carriers for triptolide. Sustained triptolide release from the hydrogel was achieved over 14 days in vitro, with higher accumulation in and cytotoxicity against human HCC Bel-7402 in comparison with L-02 fetal hepatocytes. After intraperitoneal injection, the hydrogel showed prolonged retention over 13 days and preferential accumulation in the liver, realizing HCC growth inhibition by99.7 ± 0.1% and animal median survival extension from 19 to 43 days, without causing noticeable pathological changes in the major organs. These results demonstrate that injectable peptide hydrogel can be a potential carrier for localized chemotherapy of HCC. | Xiyue Zhao Xiaoyu Liu Pengcheng Zhang Yiran Liu Wei Ran Ying Cai Junyang Wang Yihui Zhai Guanru Wang Yaping Ding Yaping Li | 2019 | Acta Pharmaceutica Sinica B2019，9，5： | 7 |
| 15 | Clinic study on silicone hydrogel contact lenses used as bandage contact lenses after LASEK surgery显示文摘AIM: To compare the clinical performance of two types of silicon hydrogel contact lenses used as bandage lenses after LASEK surgery.METHODS: A prospective,double-masked study was conducted on 42 eyes of 21 patients who received binocular LASEK surgeries.The interocular difference in spherical equivalent power was less than -1.50D.Patients were randomly assigned to wear Galyfilcon A (Lens A) bandage contact lens in one eye and Balafilcon A (Lens B) in the fellow eye after the surgery.The responses to a subjective questionnaire on comfort of wearing,corneal epithelial status,conjunctival hyperemia,limbal neovascularization,lens fitting and contact lens debris were assessed 1 and 5 days postoperatively.Corneal endothelium was assessed before and 5 days after the surgery upon bandage lens removal.RESULTS: There was no difference between the two groups in terms of conjunctival hyperemia,limbal neovascularization,contact lens fitting,corneal epithelial status,corneal endothelium cell density (CD) and endothelium cell size (CS) at any postoperative visit.Complaints of discomfort,including foreign body sensation,pain and intolerance were statistically more among Lens B wearers at any postoperative visit (P <0.05).Lens B appeared to attract much more debris than Lens A at the 5-day post-operative follow-up visit (P <0.01).CONCLUSION: The two types of silicon hydrogel lenses investigated in this study demonstrated similar clinical performance in terms of corneal responses and lens fitting.However,Lens A showed a better performance in terms of comfort of wearing and deposit resistance. | Xiao-Mei Qu Jin-Hui Dai Zhen-Ying Jiang and Yi-Feng Qian | 2011 | International Journal of Ophthalmology(English edition)2011，4，3： | 7 |
| 16 | Preparation and Performance of Salt Tolerance and Thermal Stability Cellulose Nanofibril Hydrogels and Their Application in Drilling Engineering显示文摘The poor salt tolerance,thermal stability,and environmental performance of petrochemicals can severely limit their applications in drilling engineering.In this study,cellulose nanofibril(CNF)hydrogels with improved salt tolerance and thermal stability were prepared,and their filtration performance was evaluated.The hydrogels were prepared through the simultaneous grafting of 2-acrylamido-2-methylpropane sulfonic acid(AMPS)and butyl acrylate(BA)onto the CNF surface through ceric ammoniumnitrate-induced radical polymerization.The modified and original CNF samples were characterized using Fourier Transform infrared spectroscopy(FT-IR)and rheological measurements.The FT-IR analysis results showed that both AMPS and BA were grafted onto the CNF backbone,affirming the successful preparation of the grafted CNFs.The rheological analysis results showed that the modified CNF hydrogels exhibited significantly improved salt tolerance,thermal stability,and“salt-thickening”effect.Moreover,the results of the fluid loss test showed that the modified CNF hydrogels exhibited a much better fluid loss control than the original CNF hydrogels.In addition,after adding 2%modified CNF hydrogels as a filtrate reducer in the drilling fluids prepared with a 6%combined salt solution,the filtrate loss was significantly reduced even after aging for 72 h at 160℃. | XiongLi Liu An Wang ChunPing Wang JiaLei Qu YangBing Wen Bin Chen ZhongGuang Wang BinBin Wu ZhaoYang Yuan Bing Wei | 2019 | Paper And Biomaterials2019，4，2： | 7 |
| 17 | A conductive and biodegradable hydrogel for minimally delivering adipose-derived stem cells显示文摘Injectable hydrogel is one of the most important biomaterials for tissue engineering and drug delivery. However, it is still a challenge to obtain an injectable hydrogel with conductive property on account of the poor water solubility of conductive polymers. Here, a conductive hydrogel with controllable biodegradability was constructed for minimally delivering adipose mesenchymal stem cells(ADSCs). Firstly, a disulfide containing and hyperbranched polymer structure poly(β-amino ester)(PBAE) with multi-acrylate end groups was synthesized by poly(ethylene glycol) diacrylate(PEGDA) and cystamine, and then tetraaniline(TA) was grafted on the PBAE chain to obtain a conductive PBAE-TA polymer. PBAE-TA shows a good water solubility, which can be crosslinked by thiol-modified hyaluronic acid(HA-SH) due to the click reaction between acrylate and thiol to in situ form a hydrogel within 1 min. The hydrogel illustrates a good electrical conductivity of 9.6×10–3 S/cm and a controllable biodegradable behavior in dithiothreotol(DTT) solution. PBAE-TA/HA-SH hydrogel was subcutaneously injected for delivering ADSCs. The gene expression of Cx43 and TGF-β1 were up-regulated by PBAE-TA/HA-SH hydrogel, suggesting an enhancement in the electrical coupling and an anti-inflammatory property. This injectable, biodegradable, and conductive hydrogel can effectively deliver stem cells, which might be used in skin, muscle, and myocardium regeneration. | SHANG YingYing LIANG Wei TAN BaoYu XIAO Meng ZOU Yang LIU WenGuang WANG Wei | 2019 | Science China(Technological Sciences)2019，62，10： | 7 |
| 18 | Rapidly in situ forming biodegradable hydrogels by combining alginate and hydroxyapatite nanocrystal显示文摘The in situ forming biodegradable polymer scaffolds are important biomaterials for tissue engineering and drug delivery.Hydrogels derived from natural proteins and polysaccharides are ideal tissue engineering scaffolds since they resemble the extracellular matrices of the tissue comprising various amino acids and sugar based macromolecules.This work presented an injectable system from partially oxidized alginate and hydroxyapatite(HAP) nanocrystal for tissue engineering and drug delivery applications.In situ release of calcium cations from HAP nanocrystal was adopted through lowering the pH with slow hydrolysis of D-glucono-δ-lactone(GDL) and homogeneous alginate gels were formulated as scaffolds with defined dimensions.The gelation time could be controlled to be in 10-15 min.The SEM observations confirmed the porous 3D hydrogel structure with interconnected pores ranging from 20 to 300 μm and the HAP particles dispersed in the scaffolds uniformly.The potential applications such as tissue engineering scaffold and injectable drug delivery system were demonstrated by subcutaneous implant test in test rats. | Lu Lu YuSha Qi ChangRen Zhou YanPeng Jiao | 2010 | Science China(Technological Sciences)2010，53，1： | 6 |
| 19 | Mussel-inspired agarose hydrogel scaffolds for skin tissue engineering显示文摘Polysaccharide hydrogels are widely used in tissue engineering because of their superior biocompatibility and low immunogenicity.However,many of these hydrogels are unrealistic for practical applications as the cost of raw materials is high,and the fabrication steps are tedious.This study focuses on the facile fabrication and optimization of agarose-polydopamine hydrogel(APG)scaffolds for skin wound healing.The first study objective was to evaluate the effects of polydopamine(PDA)on the mechanical properties,water holding capacity and cell adhesiveness of APG.We observed that APG showed decreased rigidity and increased water content with the addition of PDA.Most importantly,decreased rigidity translated into significant increase in cell adhesiveness.Next,the slow biodegradability and high biocompatibility of APG with the highest PDA content(APG3)was confirmed.In addition,APG3 promoted full-thickness skin defect healing by accelerating collagen deposition and promoting angiogenesis.Altogether,we have developed a straightforward and efficient strategy to construct functional APG scaffold for skin tissue engineering,which has translation potentials in clinical practice. | Ting Su Mengying Zhang Qiankun Zeng Wenhao Pan Yijing Huang Yuna Qian Wei Dong Xiaoliang Qi Jianliang Shen | 2021 | Bioactive Materials2021，6，3： | 6 |
| 20 | Modified hyaluronic acid hydrogels with chemical groups that facilitate adhesion to host tissues enhance cartilage regeneration显示文摘Stable integration of hydrogel implants with host tissues is of critical importance to cartilage tissue engineering.Designing and fabricating hydrogels with high adhesive strength,stability and regeneration potential are major challenges to be overcome.This study fabricated injectable adhesive hyaluronic acid(HA)hydrogel modified by aldehyde groups and methacrylate(AHAMA)on the polysaccharide backbone with multiple anchoring mechanisms(amide bond through the dynamic Schiff base reaction,hydrogen bond and physical interpenetration).AHAMA hydrogel exhibited significantly improved durability and stability within a humid environment(at least 7 days),together with higher adhesive strength(43 KPa to skin and 52 KPa to glass),as compared to commercial fibrin glue(nearly 10 KPa)and HAMA hydrogel(nearly 20 KPa).The results showed that AHAMA hydrogel was biocompatible and could be easily and rapidly prepared in situ.In vitro cell culture experiments showed that AHAMA hydrogel could enhance proliferation(1.2-folds after 3 days)and migration(1.5-folds after 12 h)of bone marrow stem cells(BMSCs),as compared to cells cultured in a culture dish.Furthermore,in a rat osteochondral defect model,implanted AHAMA hydrogel significantly promoted integration between neo-cartilage and host tissues,and significantly improved cartilage regeneration(modified O’Driscoll histological scores of 16.0±4.1 and 18.3±4.6 after 4 and 12-weeks of post-implantation in AHAMA groups respectively,12.0±2.7 and 12.2±2.8 respectively in HAMA groups,9.8±2.4 and 11.5±2.1 respectively in untreated groups).Hence,AHAMA hydrogel is a promising adhesive biomaterial for clinical cartilage regeneration and other biomedical applications. | Jiaqing Chen Jiabei Yang Li Wang Xuewei Zhang Boon Chin Heng Dong-An Wang Zigang Ge | 2021 | Bioactive Materials2021，6，6： | 6 |
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