101
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Li C, Yang M, Zhu L, Zhu Y. Honeysuckle flowers extract loaded Bombyx mori silk fibroin films for inducing apoptosis of HeLa cells. Microsc Res Tech 2017; 80:1297-1303. [PMID: 28841768 PMCID: PMC5763328 DOI: 10.1002/jemt.22928] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Revised: 08/08/2017] [Accepted: 08/08/2017] [Indexed: 01/30/2023]
Abstract
This study aimed to prepare silk fibroin (SF) films loaded with honeysuckle flowers extract (HFE) for inducing apoptosis of HeLa cells. We mixed solution of SF and HFE by air-drying for preparing the honeysuckle flowers extract loaded silk fibroin (SFH) films. The physical properties including morphologies, contact angle, roughness, and Z range were characterized. MTS assay and fluorescence micrographs proved that SFH films inhibited the proliferation rate of HeLa cells due to induction of HFE into SF films. Furthermore, cell apoptosis assay and cell cycle analysis confirmed that the apoptosis of HeLa cells resulted from SFH films. Therefore, SFH films designed in our study might be a promising candidate material for cancer therapy.
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Affiliation(s)
- Chenlin Li
- Institute of Applied Bioresource, College of Animal ScienceZhejiang UniversityHangzhou, Zhejiang 310058People's Republic of China
| | - Mingying Yang
- Institute of Applied Bioresource, College of Animal ScienceZhejiang UniversityHangzhou, Zhejiang 310058People's Republic of China
| | - Liangjun Zhu
- Institute of Applied Bioresource, College of Animal ScienceZhejiang UniversityHangzhou, Zhejiang 310058People's Republic of China
| | - Yongqiang Zhu
- Zhejiang Academy of Traditional Chinese MedicineHangzhou, Zhejiang 310058People's Republic of China
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102
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Injectable silk fibroin hydrogels functionalized with microspheres as adult stem cells-carrier systems. Int J Biol Macromol 2017; 108:960-971. [PMID: 29113887 DOI: 10.1016/j.ijbiomac.2017.11.013] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 11/02/2017] [Accepted: 11/03/2017] [Indexed: 12/30/2022]
Abstract
Hydrogels are good candidate materials for cell delivery scaffolds because they can mimic the physical, chemical, electrical and biological properties of most of the native tissues. In this study, composite biosynthetic hydrogels were produced by combining the bio-functionality of silk fibroin (SF) with the structural versatility of polyethylene-glycol-diacrylated (PEGDa). The formation of a photopolymerizable PEGDa-SF hydrogel (PSFHy) was optimized for 3D-cell culture. Functionalization of the 3D-PSFHy with protein microspheres (MS) was required to increase the porosity and cell-adhesive properties of the material. Cardiac mesenchymal stem cells, which were cultured within the MS-embedding PSFHy, exhibited good viability and expression of proteins that are characteristic of the initial phases of the cardiac muscle differentiation process. Further, the addition of chondroitin sulfate into the scaffolds improved the cell viability. A cell-preconditioning of the scaffold was also performed, suggesting a potential application of these sponge-like scaffolds for analysing the effects of several extracellular microenvironments, produced by different kinds of cells, on the stem cells fate. The results presented herein highlight on the possibility to use the PSFHys functionalized with MS as stem cell-carrier systems with sponge-like properties, potential ultrasound-imaging contrast agents and controlled biochemical factor delivery.
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103
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Zhou F, Zhang X, Cai D, Li J, Mu Q, Zhang W, Zhu S, Jiang Y, Shen W, Zhang S, Ouyang HW. Silk fibroin-chondroitin sulfate scaffold with immuno-inhibition property for articular cartilage repair. Acta Biomater 2017; 63:64-75. [PMID: 28890259 DOI: 10.1016/j.actbio.2017.09.005] [Citation(s) in RCA: 95] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 09/02/2017] [Accepted: 09/05/2017] [Indexed: 01/15/2023]
Abstract
The demand of favorable scaffolds has increased for the emerging cartilage tissue engineering. Chondroitin sulfate (CS) and silk fibroin have been investigated and reported with safety and excellent biocompatibility as tissue engineering scaffolds. However, the rapid degradation rate of pure CS scaffolds presents a challenge to effectively recreate neo-tissue similar to natural articular cartilage. Meanwhile the silk fibroin is well used as a structural constituent material because its remarkable mechanical properties, long-lasting in vivo stability and hypoimmunity. The application of composite silk fibroin and CS scaffolds for joint cartilage repair has not been well studied. Here we report that the combination of silk fibroin and CS could synergistically promote articular cartilage defect repair. The silk fibroin (silk) and silk fibroin/CS (silk-CS) scaffolds were fabricated with salt-leaching, freeze-drying and crosslinking methodologies. The biocompatibility of the scaffolds was investigated in vitro by cell adhesion, proliferation and migration with human articular chondrocytes. We found that silk-CS scaffold maintained better chondrocyte phenotype than silk scaffold; moreover, the silk-CS scaffolds reduced chondrocyte inflammatory response that was induced by interleukin (IL)-1β, which is in consistent with the well-documented anti-inflammatory activities of CS. The in vivo cartilage repair was evaluated with a rabbit osteochondral defect model. Silk-CS scaffold induced more neo-tissue formation and better structural restoration than silk scaffold after 6 and 12weeks of implantation in ICRS histological evaluations. In conclusion, we have developed a silk fibroin/ chondroitin sulfate scaffold for cartilage tissue engineering that exhibits immuno-inhibition property and can improve the self-repair capacity of cartilage. STATEMENT OF SIGNIFICANCE Severe cartilage defect such as osteoarthritis (OA) is difficult to self-repair because of its avascular, aneural and alymphatic nature. Current scaffolds often focus on providing sufficient mechanical support or bio-mimetic structure to promote cartilage repair. Thus, silk has been adopted and investigated broadly. However, inflammation is one of the most important factors in OA. But few scaffolds for cartilage repair reported anti-inflammation property. Meanwhile, chondroitin sulfate (CS) is a glycosaminoglycan present in the natural cartilage ECM, and has exhibited a number of useful biological properties including anti-inflammatory activity. Thus, we designed this silk-CS scaffold and proved that this scaffold exhibited good anti-inflammatory effects both in vitro and in vivo, promoted the repair of articular cartilage defect in animal model.
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Affiliation(s)
- Feifei Zhou
- Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cell and Regenerative Medicine, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Laboratory of Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Xianzhu Zhang
- Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cell and Regenerative Medicine, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Laboratory of Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Dandan Cai
- Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cell and Regenerative Medicine, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Laboratory of Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Jun Li
- Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cell and Regenerative Medicine, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Laboratory of Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Qin Mu
- Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cell and Regenerative Medicine, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Laboratory of Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Wei Zhang
- Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cell and Regenerative Medicine, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Laboratory of Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Shouan Zhu
- Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cell and Regenerative Medicine, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Laboratory of Tissue Engineering and Regenerative Medicine, Hangzhou, China
| | - Yangzi Jiang
- Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cell and Regenerative Medicine, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Laboratory of Tissue Engineering and Regenerative Medicine, Hangzhou, China; Center for Cellular and Molecular Engineering, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States
| | - Weiliang Shen
- Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cell and Regenerative Medicine, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Laboratory of Tissue Engineering and Regenerative Medicine, Hangzhou, China; Department of Orthopedic Surgery, 2nd Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Shufang Zhang
- Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cell and Regenerative Medicine, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Laboratory of Tissue Engineering and Regenerative Medicine, Hangzhou, China.
| | - Hong Wei Ouyang
- Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cell and Regenerative Medicine, School of Medicine, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Laboratory of Tissue Engineering and Regenerative Medicine, Hangzhou, China; State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China; Department of Sports Medicine, School of Medicine, Zhejiang University, Hangzhou, China
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104
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Li AB, Kluge JA, Zhi M, Cicerone MT, Omenetto FG, Kaplan DL. Enhanced Stabilization in Dried Silk Fibroin Matrices. Biomacromolecules 2017; 18:2900-2905. [PMID: 28777562 DOI: 10.1021/acs.biomac.7b00857] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Preliminary studies have shown that silk fibroin can protect biomacromolecules from thermal degradation, but a deeper understanding of underlying mechanisms needed to fully leverage the stabilizing potential of this matrix has not been realized. In this study, we investigate stabilization of plasma C-reactive protein (CRP), a diagnostic indicator of infection or inflammation, to gain insight into stabilizing mechanisms of silk. We observed that the addition of antiplasticizing excipients that suppress β-relaxation amplitudes in silk matrices resulted in enhanced stability of plasma CRP. These observations are consistent with those made in sugar-glass-based protein-stabilizing matrices and suggest fundamental insight into mechanisms as well as practical strategies to employ with silk protein matrices for enhanced stabilization utility.
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Affiliation(s)
| | | | - Miaochan Zhi
- Materials Measurement Lab, National Institute of Standards and Technology , 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Marcus T Cicerone
- Materials Measurement Lab, National Institute of Standards and Technology , 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
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105
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Wang P, Zhuo X, Chu W, Tang X. Exenatide-loaded microsphere/thermosensitive hydrogel long-acting delivery system with high drug bioactivity. Int J Pharm 2017; 528:62-75. [DOI: 10.1016/j.ijpharm.2017.05.069] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 05/29/2017] [Accepted: 05/29/2017] [Indexed: 12/17/2022]
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106
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Wang J, Yang S, Li C, Miao Y, Zhu L, Mao C, Yang M. Nucleation and Assembly of Silica into Protein-Based Nanocomposites as Effective Anticancer Drug Carriers Using Self-Assembled Silk Protein Nanostructures as Biotemplates. ACS APPLIED MATERIALS & INTERFACES 2017; 9:22259-22267. [PMID: 28665103 PMCID: PMC5759309 DOI: 10.1021/acsami.7b05664] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Bombyx mori (B. mori) silk fibroin and sericin can act as a great candidate in delivering drugs or other bioactive substances. Silica also has a great application in the field of drug delivery. To the best of our knowledge, there has been no report on the design of a nanocomposite made of silk protein and silica for drug delivery. Here, for the first time, we used B. mori silk fibroin (SF) and sericin (SS), self-assembled into nanospheres and nanofibers in situ in the aqueous solution, respectively, as a biotemplate to regulate the nucleation and self-assembly of silica for designing anticancer drug delivery. SF and SS mediated the nucleation and assembly of silica into monodispersed nanospheres (termed Si/SF) and nanofibers (termed Si/SS), respectively. The size and topography of the silica assemblies were dependent on the concentration of SF or SS as well as reaction conditions. Both Si/SF nanospheres and Si/SS nanofibers showed a high loading capability and sustained release profile of an anticancer drug, doxorubicin (DOX), in vitro. Si/SF nanospheres were found to be efficiently internalized in human cervical carcinoma (HeLa) cells and accumulate around the cell nuclei. Si/SS nanofibers could only adhere to the surface of the cancer cells. This indicates that DOX-loaded Si/SF nanospheres and Si/SS nanofibers are more effective in cancer therapy than free DOX. Our results suggest that the self-assembled Si/SF spheres and Si/SS nanofibers are potential effective anticancer drug carriers.
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Affiliation(s)
- Jie Wang
- Institute of Applied Bioresource Research, College of Animal Science, Zhejiang University, Yuhangtang Road 866, Hangzhou 310058, China
| | - Shuxu Yang
- Department of Neurosurgery, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Yuhangtang Road 866, Hangzhou 310058, China
| | - Chenlin Li
- Institute of Applied Bioresource Research, College of Animal Science, Zhejiang University, Yuhangtang Road 866, Hangzhou 310058, China
| | - Yungen Miao
- Institute of Applied Bioresource Research, College of Animal Science, Zhejiang University, Yuhangtang Road 866, Hangzhou 310058, China
| | - Liangjun Zhu
- Institute of Applied Bioresource Research, College of Animal Science, Zhejiang University, Yuhangtang Road 866, Hangzhou 310058, China
| | - Chuanbin Mao
- School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
- Department of Chemistry & Biochemistry, Stephenson Life Science Research Center, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019-5251, United States
| | - Mingying Yang
- Institute of Applied Bioresource Research, College of Animal Science, Zhejiang University, Yuhangtang Road 866, Hangzhou 310058, China
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107
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Abstract
The development of biomaterials designed for specific applications is an important objective in personalized medicine. While the breadth and prominence of biomaterials have increased exponentially over the past decades, critical challenges remain to be addressed, particularly in the development of biomaterials that exhibit highly specific functions. These functional properties are often encoded within the molecular structure of the component molecules. Proteins, as a consequence of their structural specificity, represent useful substrates for the construction of functional biomaterials through rational design. This chapter provides an in-depth survey of biomaterials constructed from coiled-coils, one of the best-understood protein structural motifs. We discuss the utility of this structurally diverse and functionally tunable class of proteins for the creation of novel biomaterials. This discussion illustrates the progress that has been made in the development of coiled-coil biomaterials by showcasing studies that bridge the gap between the academic science and potential technological impact.
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Affiliation(s)
- David A.D. Parry
- Institute of Fundamental Sciences and Riddet Institute, Massey University, Palmerston North, New Zealand
| | - John M. Squire
- Muscle Contraction Group, School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, United Kingdom
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108
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Chirila TV, Suzuki S, Papolla C. A comparative investigation of Bombyx mori silk fibroin hydrogels generated by chemical and enzymatic cross-linking. Biotechnol Appl Biochem 2017; 64:771-781. [PMID: 28220960 DOI: 10.1002/bab.1552] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 12/24/2016] [Indexed: 11/05/2022]
Abstract
Fibroin, the major proteinaceous component of the silk fiber produced by larvae of the domesticated silk moth (Bombyx mori), has been widely investigated as a biomaterial for potential applications in tissue engineering and regenerative medicine. Following sol-gel transition, silk fibroin solutions can generate hydrogels that present certain advantages when employed as biomaterials, especially if they are cross-linked. The subject of this study was the self-cross-linking of silk fibroin through a process induced by the enzyme horseradish peroxidase (HRP) in the presence of hydrogen peroxide, a method only recently proposed and scarcely reported. The hydrogels were prepared either by physical cross-linking, by cross-linking with a natural compound (genipin), or by enzymatic cross-linking. The products were comparatively characterized in regard to their synthesis and background chemical aspects, physical and optical properties, mechanical properties, secondary structure, swelling/deswelling behavior, enzymatic degradation, and compatibility as substrates for cell adhesion and proliferation. The study confirmed the advantages of the HRP-induced cross-linking, which included considerably shorter gelation times, enhanced elasticity of the resulting hydrogels, and improved cytocompatibility. Discrepancies between certain results of this investigation and those reported previously were discussed in detail.
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Affiliation(s)
- Traian V Chirila
- Queensland Eye Institute, South Brisbane, Australia.,Science & Engineering Faculty, Queensland University of Technology, Brisbane, Australia.,Australian Institute of Bioengineering & Nanotechnology, The University of Queensland, St Lucia, Australia.,Faculty of Medicine & Biomedical Sciences, The University of Queensland, Herston, Australia.,Faculty of Science, The University of Western Australia, Crawley, Australia
| | - Shuko Suzuki
- Queensland Eye Institute, South Brisbane, Australia
| | - Chloé Papolla
- Polytech Marseille, Department of Biomedical Engineering, Aix-Marseille University, Site Luminy, Marseille, France
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109
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Celikkin N, Rinoldi C, Costantini M, Trombetta M, Rainer A, Święszkowski W. Naturally derived proteins and glycosaminoglycan scaffolds for tissue engineering applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 78:1277-1299. [PMID: 28575966 DOI: 10.1016/j.msec.2017.04.016] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 04/02/2017] [Accepted: 04/03/2017] [Indexed: 12/25/2022]
Abstract
Tissue engineering (TE) aims to mimic the complex environment where organogenesis takes place using advanced materials to recapitulate the tissue niche. Cells, three-dimensional scaffolds and signaling factors are the three main and essential components of TE. Over the years, materials and processes have become more and more sophisticated, allowing researchers to precisely tailor the final chemical, mechanical, structural and biological features of the designed scaffolds. In this review, we will pose the attention on two specific classes of naturally derived polymers: fibrous proteins and glycosaminoglycans (GAGs). These materials hold great promise for advances in the field of regenerative medicine as i) they generally undergo a fast remodeling in vivo favoring neovascularization and functional cells organization and ii) they elicit a negligible immune reaction preventing severe inflammatory response, both representing critical requirements for a successful integration of engineered scaffolds with the host tissue. We will discuss the recent achievements attained in the field of regenerative medicine by using proteins and GAGs, their merits and disadvantages and the ongoing challenges to move the current concepts to practical clinical application.
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Affiliation(s)
- Nehar Celikkin
- Warsaw University of Technology, Faculty of Material Science and Engineering, 141 Woloska str., 02-507 Warsaw, Poland
| | - Chiara Rinoldi
- Warsaw University of Technology, Faculty of Material Science and Engineering, 141 Woloska str., 02-507 Warsaw, Poland
| | - Marco Costantini
- Tissue Engineering Unit, Department of Engineering, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo 21, 00128 Rome, Italy
| | - Marcella Trombetta
- Tissue Engineering Unit, Department of Engineering, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo 21, 00128 Rome, Italy
| | - Alberto Rainer
- Tissue Engineering Unit, Department of Engineering, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo 21, 00128 Rome, Italy
| | - Wojciech Święszkowski
- Warsaw University of Technology, Faculty of Material Science and Engineering, 141 Woloska str., 02-507 Warsaw, Poland.
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110
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Kasoju N, Hawkins N, Pop-Georgievski O, Kubies D, Vollrath F. Silk fibroin gelation via non-solvent induced phase separation. Biomater Sci 2017; 4:460-73. [PMID: 26730413 DOI: 10.1039/c5bm00471c] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Tissue engineering benefits from novel materials with precisely tunable physical, chemical and mechanical properties over a broad range. Here we report a practical approach to prepare Bombyx mori silk fibroin hydrogels using the principle of non-solvent induced phase separation (NIPS). A combination of reconstituted silk fibroin (RSF) and methanol (non-solvent), with a final concentration of 2.5% w/v and 12.5% v/v respectively, maintained at 22 °C temperature turned into a hydrogel within 10 hours. Freeze-drying of this gel gave a foam with a porosity of 88%, a water uptake capacity of 89% and a swelling index of 8.6. The gelation kinetics and the loss tangent of the gels were investigated by rheometry. The changes in the morphology of the porous foams were visualized by SEM. The changes in RSF chemical composition and the relative fraction of its secondary structural elements were analyzed by ATR-FTIR along with Fourier self-deconvolution. And, the changes in the glass transition temperature, specific heat capacity and the relative fraction of crystallinity of RSF were determined by TM-DSC. Data suggested that RSF-water-methanol behaved as a polymer-solvent-non-solvent ternary phase system, wherein the demixing of the water-methanol phases altered the thermodynamic equilibrium of RSF-water phases and resulted in the desolvation and eventual separation of the RSF phase. Systematic analysis revealed that both gelation time and the properties of hydrogels and porous foams could be controlled by the ratios of RSF and non-solvent concentration as well as by the type of non-solvent and incubation temperature. Due to the unique properties we envisage that the herein prepared NIPS induced RSF hydrogels and porous foams can possibly be used for the encapsulation of cells and/or for the controlled release of both hydrophilic and hydrophobic drugs.
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Affiliation(s)
- Naresh Kasoju
- Department of Biomaterials and Bioanalogous Polymer Systems, Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Prague, Czech Republic. and Department of Zoology, University of Oxford, Oxford, UK.
| | | | - Ognen Pop-Georgievski
- Department of Chemistry and Physics of Surfaces and Biointerfaces, Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Prague, Czech Republic
| | - Dana Kubies
- Department of Biomaterials and Bioanalogous Polymer Systems, Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Prague, Czech Republic.
| | - Fritz Vollrath
- Department of Zoology, University of Oxford, Oxford, UK.
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111
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Brown JE, Moreau JE, Berman AM, McSherry HJ, Coburn JM, Schmidt DF, Kaplan DL. Shape Memory Silk Protein Sponges for Minimally Invasive Tissue Regeneration. Adv Healthc Mater 2017; 6:10.1002/adhm.201600762. [PMID: 27863133 PMCID: PMC5266640 DOI: 10.1002/adhm.201600762] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 08/30/2016] [Indexed: 12/20/2022]
Abstract
Porous silk protein scaffolds are designed to display shape memory characteristics and volumetric recovery following compression. Two strategies are utilized to realize shape recovery: addition of hygroscopic plasticizers like glycerol, and tyrosine modifications with hydrophilic sulfonic acid chemistries. Silk sponges are evaluated for recovery following 80% compressive strain, total porosity, pore size distribution, secondary structure development, in vivo volume retention, cell infiltration, and inflammatory responses. Glycerol-modified sponges recover up to 98.3% of their original dimensions following compression, while sulfonic acid/glycerol modified sponges swell in water up to 71 times their compressed volume, well in excess of their original size. Longer silk extraction times (lower silk molecular weights) and higher glycerol concentrations yielded greater flexibility and shape fidelity, with no loss in modulus following compression. Sponges are over 95% porous, with secondary structure analysis indicating glycerol-induced β-sheet physical crosslinking. Tyrosine modifications with sulfonic acid interfere with β-sheet formation. Glycerol-modified sponges exhibit improved rates of cellular infiltration at subcutaneous implant sites with minimal immune response in mice. They also degrade more rapidly than unmodified sponges, a result posited to be cell-mediated. Overall, this work suggests that silk sponges may be useful for minimally invasive deployment in soft tissue augmentation procedures.
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Affiliation(s)
- Joseph E. Brown
- Department of Biomedical Engineering, Tufts University, Medford, MA 02155
| | - Jodie E. Moreau
- Department of Biomedical Engineering, Tufts University, Medford, MA 02155
| | - Alison M. Berman
- Department of Biomedical Engineering, Tufts University, Medford, MA 02155
| | | | - Jeannine M. Coburn
- Department of Biomedical Engineering, Tufts University, Medford, MA 02155
| | - Daniel F. Schmidt
- Department of Plastics Engineering, University of Massachusetts Lowell, Lowell, MA, 01854
| | - David L. Kaplan
- Department of Biomedical Engineering, Tufts University, Medford, MA 02155
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112
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Yan LP, Oliveira JM, Oliveira AL, Reis RL. Core-shell silk hydrogels with spatially tuned conformations as drug-delivery system. J Tissue Eng Regen Med 2016; 11:3168-3177. [DOI: 10.1002/term.2226] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Revised: 04/16/2016] [Accepted: 04/19/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Le-Ping Yan
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics; University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine; Guimarães Portugal
- ICVS/3B's - PT Government Associate Laboratory; Braga/Guimarães Portugal
| | - Joaquim M. Oliveira
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics; University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine; Guimarães Portugal
- ICVS/3B's - PT Government Associate Laboratory; Braga/Guimarães Portugal
| | - Ana L. Oliveira
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics; University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine; Guimarães Portugal
- ICVS/3B's - PT Government Associate Laboratory; Braga/Guimarães Portugal
- CBQF - Center for Biotechnology and Fine Chemistry, School of Biotechnology; Portuguese Catholic University; Porto Portugal
| | - Rui L. Reis
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics; University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine; Guimarães Portugal
- ICVS/3B's - PT Government Associate Laboratory; Braga/Guimarães Portugal
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113
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Singh SK, Bhunia BK, Bhardwaj N, Gilotra S, Mandal BB. Reloadable Silk-Hydrogel Hybrid Scaffolds for Sustained and Targeted Delivery of Molecules. Mol Pharm 2016; 13:4066-4081. [DOI: 10.1021/acs.molpharmaceut.6b00672] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Saket Kumar Singh
- Biomaterial
and Tissue Engineering Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781 039, India
| | - Bibhas Kumar Bhunia
- Biomaterial
and Tissue Engineering Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781 039, India
| | - Nandana Bhardwaj
- Biological
and Chemical Sciences Section, Life Sciences Division, Institute of Advanced Study in Science and Technology, Guwahati 781 035, India
| | - Sween Gilotra
- Biomaterial
and Tissue Engineering Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781 039, India
| | - Biman B. Mandal
- Biomaterial
and Tissue Engineering Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781 039, India
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114
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Kumar M, Coburn J, Kaplan DL, Mandal BB. Immuno-Informed 3D Silk Biomaterials for Tailoring Biological Responses. ACS APPLIED MATERIALS & INTERFACES 2016; 8:29310-29322. [PMID: 27726371 DOI: 10.1021/acsami.6b09937] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Macrophages, the key players in immunoregulation, are actively involved in tissue remodelling and vascularization. Recent advances in tissue engineering and regenerative medicine illustrate the importance of "immuno-informed" biomaterials to regulate the microenvironment of biomedical implants. In the current study, silk-based 3D hydrogels were utilized to regulate cytokine delivery for macrophage, a type of immune cell, differentiation and polarization. Three different hydrogel variants, silk-poly(ethylene glycol) (PEG) (SP), silk-horseradish peroxidase (HRP) (SH) and silk-sonicated (SS) hydrogels were studied. Hydrogels were loaded with the M1 and M2 polarizing cytokines interferon-γ (IFN-γ) and interleukin-4 (IL-4), respectively. Functional cytokine release and macrophage polarization studies were conducted using three cytokine exposure approaches: only cytokine encapsulation (macrophage in culture well), only macrophage encapsulation (cytokine in culture media) and cytokine with macrophage encapsulation. The extent of macrophage polarization by cytokine-eluting and macrophage-encapsulating hydrogels was investigated using gene expression analysis for C-C chemokine receptor 7 (CCR7), Interleukin-1 beta (IL-1β), cluster of differentiation 206 (CD206) and cluster of differentiation 209 (CD209). The released cytokines polarized macrophages from an M0 phenotype to an M1/M2 phenotype. Also, lineage committed M1/M2 macrophages could be "switched" to their M2/M1 counterparts (M1-to-M2 or M2-to-M1 transition) exhibiting their well-established plasticity. When macrophages were encapsulated in hydrogels, polarization could be induced to the lineage committed M1 or M2 phenotypes either in polarizing media or when coencapsulated with cytokines. Through this study, silk hydrogels demonstrated utility as a novel system for focal delivery of cytokines and macrophages as "immuno-informed" 3D silk-biomaterials.
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Affiliation(s)
- Manishekhar Kumar
- Biomaterial and Tissue Engineering Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati (IITG) , Guwahati, 781039, India
| | - Jeannine Coburn
- Department of Biomedical Engineering, Tufts University , Medford, Massachusetts United States
| | - David L Kaplan
- Department of Biomedical Engineering, Tufts University , Medford, Massachusetts United States
| | - Biman B Mandal
- Biomaterial and Tissue Engineering Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati (IITG) , Guwahati, 781039, India
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Wang P, Wang Q, Ren T, Gong H, Gou J, Zhang Y, Cai C, Tang X. Effects of Pluronic F127-PEG multi-gel-core on the release profile and pharmacodynamics of Exenatide loaded in PLGA microspheres. Colloids Surf B Biointerfaces 2016; 147:360-367. [DOI: 10.1016/j.colsurfb.2016.08.032] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 07/26/2016] [Accepted: 08/19/2016] [Indexed: 12/21/2022]
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116
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Wu H, Liu S, Xiao L, Dong X, Lu Q, Kaplan DL. Injectable and pH-Responsive Silk Nanofiber Hydrogels for Sustained Anticancer Drug Delivery. ACS APPLIED MATERIALS & INTERFACES 2016; 8:17118-26. [PMID: 27315327 DOI: 10.1021/acsami.6b04424] [Citation(s) in RCA: 130] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Silk is useful as a drug carrier due to its biocompatibility, tunable degradation, and outstanding capacity in maintaining the function of drugs. Injectable silk hydrogels could deliver doxorubicin (DOX) for localized chemotherapy for breast cancer. To improve hydrogel properties, thixotropic silk nanofiber hydrogels in an all-aqueous solution were prepared and used to locally deliver DOX. The silk hydrogels displayed thixotropic capacity, allowing for easy injectability followed by solidification in situ. The hydrogels were loaded with DOX and released the drug over eight weeks with pH- and concentration-dependent release kinetics. In vitro and in vivo studies demonstrated that DOX-loaded silk hydrogels had good antitumor response, outperforming the equivalent dose of free DOX administered intravenously. Thixotropic silk hydrogels provide improved injectability to support sustained release, suggesting promising applications for localized chemotherapy.
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Affiliation(s)
- Hongchun Wu
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, P.R. China
| | - Shanshan Liu
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, P.R. China
| | - Liying Xiao
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, P.R. China
- National Engineering Laboratory for Modern Silk, Soochow University , Suzhou 215123, P.R. China
| | - Xiaodan Dong
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, P.R. China
- National Engineering Laboratory for Modern Silk, Soochow University , Suzhou 215123, P.R. China
| | - Qiang Lu
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, P.R. China
- National Engineering Laboratory for Modern Silk, Soochow University , Suzhou 215123, P.R. China
| | - David L Kaplan
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, P.R. China
- Department of Biomedical Engineering, Tufts University , Medford, Massachusetts 02155, United States
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Characteristics of Reconstituted Lyophilized Tendon Hydrogel: An Injectable Scaffold for Tendon Regeneration. Plast Reconstr Surg 2016; 137:843-851. [PMID: 26910664 DOI: 10.1097/01.prs.0000480012.41411.7c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND The authors have developed a tendon hydrogel that may be injected into the site of tendon injury to improve speed and strength of repair. The aim of this study was to compare the biological and physical properties of fresh, hydrated tendon hydrogel with its reconstituted lyophilized counterpart with the goal of increasing clinical feasibility. MATERIALS Hydrogel was prepared from fresh human cadaveric flexor tendon. Fresh gel was compared to gel aliquots that were lyophilized and reconstituted with sterile deionized water. Scanning electron microscopy was used to examine the microarchitecture of gelated samples. Rat adipose-derived stem cells were seeded in hydrogel, and cell viability was assessed after 7 days. MTS colorimetric assay was used to evaluate both the effect of prolonged storage on gel and the ability of reconstituted lyophilized hydrogel to activate platelet-rich plasma. The viability and proliferation of luciferase-transfected adipose-derived stem cells embedded within hydrogel in vivo was assessed by a bioluminescence in vivo imaging system. RESULTS Reconstituted lyophilized hydrogel demonstrated similar handling properties compared to fresh gel. Adipose-derived stem cells remained viable 7 days after reseeding in both conditions. Lyophilized hydrogel retained its ability to activate platelet-rich plasma and retained 95 percent of its maximal proliferative capacity at 30 days. The in vivo imaging system demonstrated similar cell proliferation, with signal persisting through day 13. CONCLUSIONS Reconstitution of lyophilized hydrogel stimulated cell proliferation and platelet-rich plasma activation to a greater degree than did fresh hydrogel. Efficacy after prolonged storage was also shown to be superior. Therefore, this lyophilized formulation of tendon hydrogel may have wider clinical applicability.
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Kluge JA, Li AB, Kahn BT, Michaud DS, Omenetto FG, Kaplan DL. Silk-based blood stabilization for diagnostics. Proc Natl Acad Sci U S A 2016; 113:5892-7. [PMID: 27162330 PMCID: PMC4889389 DOI: 10.1073/pnas.1602493113] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Advanced personalized medical diagnostics depend on the availability of high-quality biological samples. These are typically biofluids, such as blood, saliva, or urine; and their collection and storage is critical to obtain reliable results. Without proper temperature regulation, protein biomarkers in particular can degrade rapidly in blood samples, an effect that ultimately compromises the quality and reliability of laboratory tests. Here, we present the use of silk fibroin as a solid matrix to encapsulate blood analytes, protecting them from thermally induced damage that could be encountered during nonrefrigerated transportation or freeze-thaw cycles. Blood samples are recovered by simple dissolution of the silk matrix in water. This process is demonstrated to be compatible with a number of immunoassays and provides enhanced sample preservation in comparison with traditional air-drying paper approaches. Additional processing can remediate interactions with conformational structures of the silk protein to further enhance blood stabilization and recovery. This approach can provide expanded utility for remote collection of blood and other biospecimens empowering new modalities of temperature-independent remote diagnostics.
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Affiliation(s)
- Jonathan A Kluge
- Department of Biomedical Engineering, Tufts University, Medford, MA 02155
| | - Adrian B Li
- Department of Chemical and Biological Engineering, Tufts University, Medford, MA 02155
| | - Brooke T Kahn
- Department of Biomedical Engineering, Tufts University, Medford, MA 02155
| | - Dominique S Michaud
- Department of Public Health and Community Medicine, Tufts University School of Medicine, Boston, MA 02111
| | | | - David L Kaplan
- Department of Biomedical Engineering, Tufts University, Medford, MA 02155; Department of Chemical and Biological Engineering, Tufts University, Medford, MA 02155;
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Kluge JA, Kahn BT, Brown JE, Omenetto FG, Kaplan DL. Optimizing Molecular Weight of Lyophilized Silk As a Shelf-Stable Source Material. ACS Biomater Sci Eng 2016; 2:595-605. [PMID: 33465861 DOI: 10.1021/acsbiomaterials.5b00556] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Storage of silk proteins in liquid form can lead to excessive waste from premature gelation, thus an alternative storage strategy is proposed using lyophilization to generate soluble and shelf-stable powder formats for on-demand use. Initial solution stability studies highlighted instabilities of higher-molecular-weight silks that could not be resolved by solution modifications such as autoclaving, pH increases, dilution, or combinations thereof. Conversely, shelf-stable lyophilized stock powders of silk fibroin of moderate to low molecular weights were developed that could be fully constituted even after 1 year of storage at elevated temperatures. Increasing dried silk powder loading in aqueous solution facilitated increased silk solution concentrations-here up to 80 mg/mL solubility was demonstrated across a range of formulations. Powders generated from silk solutions with higher-molecular-weight distributions were less soluble than moderate or lower-molecular-weight versions, despite no differences in their solution glass-transition temperatures. Instead, the aggregation and β-sheet content of lyophilized higher molecular weight stock solutions were identified as the cause of the reduced powder solubility by circular dichroism and dynamic light scattering analyses. The solubility and molecular weight profiles of all formulations investigated were preserved after storing the lyophilized materials over 1 year, even at 37 °C. No long-term powder stability behaviors were influenced by the addition of a secondary drying step in the lyophilization procedure, suggesting that this protocol could be scaled without the burden of lengthy process times. Taken together, these findings provide a very flexible and potentially cost-saving approach to producing shelf-stable silk fibroin stock materials based on the use of moderate to lower-molecular-weight lyophilized preparations. This utility is demonstrated with the formation of silk material formats from the stored powders, including films, gels, and salt-leached porous scaffolds. In turn, a more efficient system allowing full resolubilization will enable stockpiling powder for on-demand usage and for deployment of dried silks for application demands in field settings.
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Affiliation(s)
- Jonathan A Kluge
- Vaxess Technologies, c/o Lab Central, 700 Main Street, Cambridge Massachusetts 02139, United States
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120
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Yao D, Liu H, Fan Y. Silk scaffolds for musculoskeletal tissue engineering. Exp Biol Med (Maywood) 2016; 241:238-45. [PMID: 26445979 PMCID: PMC4935447 DOI: 10.1177/1535370215606994] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Accepted: 08/27/2015] [Indexed: 12/21/2022] Open
Abstract
The musculoskeletal system, which includes bone, cartilage, tendon/ligament, and skeletal muscle, is becoming the targets for tissue engineering because of the high need for their repair and regeneration. Numerous factors would affect the use of musculoskeletal tissue engineering for tissue regeneration ranging from cells used for scaffold seeding to the manufacture and structures of materials. The essential function of the scaffolds is to convey growth factors as well as cells to the target site to aid the regeneration of the injury. Among the variety of biomaterials used in scaffold engineering, silk fibroin is recognized as an ideal material for its impressive cytocompatibility, slow biodegradability, and excellent mechanical properties. The current review describes the advances made in the fabrication of silk fibroin scaffolds with different forms such as films, particles, electrospun fibers, hydrogels, three-dimensional porous scaffolds, and their applications in the regeneration of musculoskeletal tissues.
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Affiliation(s)
- Danyu Yao
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, People's Republic of China
| | - Haifeng Liu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, People's Republic of China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, People's Republic of China National Research Center for Rehabilitation Technical Aids, Beijing 100176, People's Republic of China
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121
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Kapoor S, Kundu SC. Silk protein-based hydrogels: Promising advanced materials for biomedical applications. Acta Biomater 2016; 31:17-32. [PMID: 26602821 DOI: 10.1016/j.actbio.2015.11.034] [Citation(s) in RCA: 278] [Impact Index Per Article: 34.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 11/08/2015] [Accepted: 11/17/2015] [Indexed: 01/20/2023]
Abstract
Hydrogels are a class of advanced material forms that closely mimic properties of the soft biological tissues. Several polymers have been explored for preparing hydrogels with structural and functional features resembling that of the extracellular matrix. Favourable material properties, biocompatibility and easy processing of silk protein fibers into several forms make it a suitable material for biomedical applications. Hydrogels made from silk proteins have shown a potential in overcoming limitations of hydrogels prepared from conventional polymers. A great deal of effort has been made to control the properties and to integrate novel topographical and functional characteristics in the hydrogel composed from silk proteins. This review provides overview of the advances in silk protein-based hydrogels with a primary emphasis on hydrogels of fibroin. It describes the approaches used to fabricate fibroin hydrogels. Attempts to improve the existing properties or to incorporate new features in the hydrogels by making composites and by improving fibroin properties by genetic engineering approaches are also described. Applications of the fibroin hydrogels in the realms of tissue engineering and controlled release are reviewed and their future potentials are discussed. STATEMENT OF SIGNIFICANCE This review describes the potentiality of silk fibroin hydrogel. Silk Fibroin has been widely recognized as an interesting biomaterial. Due to its properties including high mechanical strength and excellent biocompatibility, it has gained wide attention. Several groups are exploring silk-based materials including films, hydrogels, nanofibers and nanoparticles for different biomedical applications. Although there is a good amount of literature available on general properties and applications of silk based biomaterials, there is an inadequacy of extensive review articles that specifically focus on silk based hydrogels. Silk-based hydrogels have a strong potential to be utilized in biomedical applications. Our work is an effort to highlight the research that has been done in the area of silk-based hydrogels. It aims to provide an overview of the advances that have been made and the future course available. It will provide an overview of the silk-based hydrogels as well as may direct the readers to the specific areas of application.
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122
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Arpaçay P, Türkan U. Development of antibiotic-loaded silk fibroin/hyaluronic acid polyelectrolyte film coated CoCrMo alloy. ACTA ACUST UNITED AC 2016; 61:463-474. [DOI: 10.1515/bmt-2015-0061] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2015] [Accepted: 09/30/2015] [Indexed: 12/16/2022]
Abstract
AbstractBacteria related infections are still a major problem for the implant materials. Such infections have occurred in nearly 3% of hip and knee replacements resulting in failure of device. There are two main approaches for inhibiting the bacterial adhesion to the surface. These involve bactericidal substances and anti-adhesive coatings. In this study, the efficiency of antibiotic-loaded silk fibroin/hyaluronic acid polyelectrolyte film coated CoCrMo alloy, prepared by means of complex coacervate and layer by layer techniques, was investigated. A medical grade CoCrMo was coated with variable number of silk fibroin/hyaluronic acid up to 14 layers at room temperature. The morphological evolution during and after formation of the crystal structure on the coating layer, the resulting surface roughness, and the corresponding alterations in the coating layer thicknesses were thoroughly studied using various analytical techniques, including attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). As a result, only 10 layers of silk fibroin/hyaluronic acid complex coacervate films were found to convey the general characteristics of the mixture of silk I and II, while layer by layer coated samples exhibited the mixture of silk I and II. Moreover, regardless of the preparation method applied, the surface roughness and the coating layer thicknesses were determined to increase with the increasing number of layers. The antibacterial test results suggested that the samples loaded with antibiotic successfully induced a bactericidal resistance against
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123
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Li AB, Kluge JA, Guziewicz NA, Omenetto FG, Kaplan DL. Silk-based stabilization of biomacromolecules. J Control Release 2015; 219:416-430. [PMID: 26403801 PMCID: PMC4656123 DOI: 10.1016/j.jconrel.2015.09.037] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 09/19/2015] [Indexed: 11/26/2022]
Abstract
Silk fibroin is a high molecular weight amphiphilic protein that self-assembles into robust biomaterials with remarkable properties including stabilization of biologicals and tunable release kinetics correlated to processing conditions. Cells, antibiotics,monoclonal antibodies and peptides, among other biologics, have been encapsulated in silk using various processing approaches and material formats. The mechanistic basis for the entrapment and stabilization features, along with insights into the modulation of release of the entrained compounds from silks will be reviewed with a focus on stabilization of bioactive molecules.
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Affiliation(s)
- Adrian B Li
- Department of Chemical and Biological Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA
| | - Jonathan A Kluge
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA
| | - Nicholas A Guziewicz
- Drug Product Technologies, Amgen, 1 Amgen Center Drive, Thousand Oaks, CA 91320, USA
| | - Fiorenzo G Omenetto
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA
| | - David L Kaplan
- Department of Chemical and Biological Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA; Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA.
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124
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Liu Q, Liu H, Fan Y. Preparation of silk fibroin carriers for controlled release. Microsc Res Tech 2015; 80:312-320. [PMID: 26638113 DOI: 10.1002/jemt.22606] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 11/09/2015] [Indexed: 12/24/2022]
Abstract
Silk fibroin provides a new option for controlled release systems as a result of its excellent biodegradability, biocompatibility, and mechanical properties. As the core material, silk fibroin can be designed and widely used in drug/gene delivery, regenerative medicine, and other biomedical fields. This review focuses on the preparation methods, loading molecules, and applications of silk fibroin-based controlled release systems including microspheres, microcapsules, films, microparticles, microneedles, liposomes, and hydrogels. These systems provide numerous advantages such as high encapsulation efficiency, avoiding loss of bioactivity and maintaining desirable range without peaks and valleys in comparison to the traditional administration approaches. Microsc. Res. Tech. 80:312-320, 2017. © 2015 Wiley Periodicals, Inc.
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Affiliation(s)
- Qiang Liu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, People's Republic of China
| | - Haifeng Liu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, People's Republic of China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, People's Republic of China.,National Research Center for Rehabilitation Technical Aids, Beijing, 100176, People's Republic of China
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125
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Zhong T, Jiang Z, Wang P, Bie S, Zhang F, Zuo B. Silk fibroin/copolymer composite hydrogels for the controlled and sustained release of hydrophobic/hydrophilic drugs. Int J Pharm 2015; 494:264-70. [DOI: 10.1016/j.ijpharm.2015.08.035] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Revised: 07/21/2015] [Accepted: 08/12/2015] [Indexed: 01/16/2023]
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126
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Sangkert S, Meesane J, Kamonmattayakul S, Chai WL. Modified silk fibroin scaffolds with collagen/decellularized pulp for bone tissue engineering in cleft palate: Morphological structures and biofunctionalities. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 58:1138-49. [PMID: 26478414 DOI: 10.1016/j.msec.2015.09.031] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Revised: 07/16/2015] [Accepted: 09/07/2015] [Indexed: 01/20/2023]
Abstract
Cleft palate is a congenital malformation that generates a maxillofacial bone defect around the mouth area. The creation of performance scaffolds for bone tissue engineering in cleft palate is an issue that was proposed in this research. Because of its good biocompatibility, high stability, and non-toxicity, silk fibroin was selected as the scaffold of choice in this research. Silk fibroin scaffolds were prepared by freeze-drying before immerging in a solution of collagen, decellularized pulp, and collagen/decellularized pulp. Then, the immersed scaffolds were freeze-dried. Structural organization in solution was observed by Atomic Force Microscope (AFM). The molecular organization of the solutions and crystal structure of the scaffolds were characterized by Fourier transform infrared (FT-IR) and X-ray diffraction (XRD), respectively. The weight increase of the modified scaffolds and the pore size were determined. The morphology was observed by a scanning electron microscope (SEM). Mechanical properties were tested. Biofunctionalities were considered by seeding osteoblasts in silk fibroin scaffolds before analysis of the cell proliferation, viability, total protein assay, and histological analysis. The results demonstrated that dendrite structure of the fibrils occurred in those solutions. Molecular organization of the components in solution arranged themselves into an irregular structure. The fibrils were deposited in the pores of the modified silk fibroin scaffolds. The modified scaffolds showed a beta-sheet structure. The morphological structure affected the mechanical properties of the silk fibroin scaffolds with and without modification. Following assessment of the biofunctionalities, the modified silk fibroin scaffolds could induce cell proliferation, viability, and total protein particularly in modified silk fibroin with collagen/decellularized pulp. Furthermore, the histological analysis indicated that the cells could adhere in modified silk fibroin scaffolds. Finally, it can be deduced that modified silk fibroin scaffolds with collagen/decellularized pulp had the performance for bone tissue engineering and a promise for cleft palate treatment.
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Affiliation(s)
- Supaporn Sangkert
- Biological Materials for Medicine Research Unit, Faculty of Medicine, Institute of Biomedical Engineering, Prince of Songkla University, Hat Yai, Songkhla90110, Thailand
| | - Jirut Meesane
- Biological Materials for Medicine Research Unit, Faculty of Medicine, Institute of Biomedical Engineering, Prince of Songkla University, Hat Yai, Songkhla90110, Thailand.
| | - Suttatip Kamonmattayakul
- Faculty of Dentistry, Department of Preventive Dentistry, Prince of Songkla University, Hat Yai, Songkhla90110, Thailand
| | - Wen Lin Chai
- Faculty of Dentistry, Department of General Dental Practice and Oral and Maxillofacial Imaging, University of Malaya, Kuala Lumpur, Malaysia
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127
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Mitropoulos AN, Marelli B, Ghezzi CE, Applegate MB, Partlow BP, Kaplan DL, Omenetto FG. Transparent, Nanostructured Silk Fibroin Hydrogels with Tunable Mechanical Properties. ACS Biomater Sci Eng 2015; 1:964-970. [PMID: 33429527 DOI: 10.1021/acsbiomaterials.5b00215] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Silk fibroin from the Bombyx mori caterpillar has been processed into many material forms, with potential applications in areas ranging from optoelectronics to tissue engineering. As a hydrogel, silk fibroin has been engineered as a substrate for the regeneration of soft tissues where hydration and mechanical compatibility are necessary. Current fabrication of silk fibroin hydrogels produces microstructured materials that lack transparency and limits the ability to fully exploit the hydrogel form. Transparency is the main characteristic of some human tissues (e.g., cornea) where silk fibroin in the film format has shown potential as scaffolding material, however, lacking the necessary hydration and successful attachment of cells without biochemical functionalization. Additionally, detection using light is an important method to translate information for instruction, sensing, and visualization of biological entities and light sensitive molecules. Here, we introduce a method for the fabrication of transparent silk hydrogels by driving the formation of nanostructures in the silk fibroin material. These nanostructures are formed by exposing silk solution (concentration below 15 mg/mL) to organic solvents that induce the amorphous to crystalline transition of the protein and indeed the sol-gel transition of the material. We have also explored a process to modulate the mechanical properties of silk fibroin hydrogel within the physiological range by controlling the amount of metal ions present in the protein structure. Nanostructured silk fibroin hydrogels are biocompatible and allow for attachment and proliferation of human dermal fibroblasts without any biochemical functionalization. In addition, seeding of human cornea epithelial cells (HCECs) on the hydrogel surface results in the formation of an epithelium, which does not alter the gels' transparency and shows biological properties that challenge the performances of HCECs seeded in collagen hydrogels, the current standard material for the engineering of corneal tissue.
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Affiliation(s)
- Alexander N Mitropoulos
- Department of Biomedical Engineering and §Department of Physics, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States
| | - Benedetto Marelli
- Department of Biomedical Engineering and Department of Physics, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States
| | - Chiara E Ghezzi
- Department of Biomedical Engineering and Department of Physics, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States
| | - Matthew B Applegate
- Department of Biomedical Engineering and Department of Physics, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States
| | - Benjamin P Partlow
- Department of Biomedical Engineering and Department of Physics, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States
| | - David L Kaplan
- Department of Biomedical Engineering and Department of Physics, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States
| | - Fiorenzo G Omenetto
- Department of Biomedical Engineering and Department of Physics, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States
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128
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Silk hydrogels for sustained ocular delivery of anti-vascular endothelial growth factor (anti-VEGF) therapeutics. Eur J Pharm Biopharm 2015; 95:271-8. [DOI: 10.1016/j.ejpb.2014.12.029] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2014] [Revised: 12/15/2014] [Accepted: 12/22/2014] [Indexed: 01/10/2023]
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129
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Liang Y, Coffin MV, Manceva SD, Chichester JA, Jones RM, Kiick KL. Controlled release of an anthrax toxin-neutralizing antibody from hydrolytically degradable polyethylene glycol hydrogels. J Biomed Mater Res A 2015. [PMID: 26223817 DOI: 10.1002/jbm.a.35545] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
In this study, hydrophilic and hydrolytically degradable poly (ethylene glycol) (PEG) hydrogels were formed via Michael-type addition and employed for sustained delivery of a monoclonal antibody against the protective antigen of anthrax. Taking advantage of the PEG-induced precipitation of the antibody, burst release from the matrix was avoided. These hydrogels were able to release active antibodies in a controlled manner from 14 days to as long as 56 days in vitro by varying the polymer architectures and molecular weights of the precursors. Analysis of the secondary and tertiary structure and the in vitro activity of the released antibody showed that the encapsulation and release did not affect the protein conformation or functionality. The results suggest the promise for developing PEG-based carriers for sustained release of therapeutic antibodies against toxins in various applications.
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Affiliation(s)
- Yingkai Liang
- Department of Materials Science and Engineering, University of Delaware, Newark, Delaware, 19716
| | - Megan V Coffin
- Fraunhofer USA, Center for Molecular Biotechnology, 9 Innovation Way, Newark, DE, 19711
| | - Slobodanka D Manceva
- Fraunhofer USA, Center for Molecular Biotechnology, 9 Innovation Way, Newark, DE, 19711
| | - Jessica A Chichester
- Fraunhofer USA, Center for Molecular Biotechnology, 9 Innovation Way, Newark, DE, 19711
| | - R Mark Jones
- Fraunhofer USA, Center for Molecular Biotechnology, 9 Innovation Way, Newark, DE, 19711
| | - Kristi L Kiick
- Department of Materials Science and Engineering, University of Delaware, Newark, Delaware, 19716.,Department of Biomedical Engineering, University of Delaware, Newark, DE, 19716
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130
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Multitarget, quantitative nanoplasmonic electrical field-enhanced resonating device (NE2RD) for diagnostics. Proc Natl Acad Sci U S A 2015. [PMID: 26195743 DOI: 10.1073/pnas.1510824112] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Recent advances in biosensing technologies present great potential for medical diagnostics, thus improving clinical decisions. However, creating a label-free general sensing platform capable of detecting multiple biotargets in various clinical specimens over a wide dynamic range, without lengthy sample-processing steps, remains a considerable challenge. In practice, these barriers prevent broad applications in clinics and at patients' homes. Here, we demonstrate the nanoplasmonic electrical field-enhanced resonating device (NE(2)RD), which addresses all these impediments on a single platform. The NE(2)RD employs an immunodetection assay to capture biotargets, and precisely measures spectral color changes by their wavelength and extinction intensity shifts in nanoparticles without prior sample labeling or preprocessing. We present through multiple examples, a label-free, quantitative, portable, multitarget platform by rapidly detecting various protein biomarkers, drugs, protein allergens, bacteria, eukaryotic cells, and distinct viruses. The linear dynamic range of NE(2)RD is five orders of magnitude broader than ELISA, with a sensitivity down to 400 fg/mL This range and sensitivity are achieved by self-assembling gold nanoparticles to generate hot spots on a 3D-oriented substrate for ultrasensitive measurements. We demonstrate that this precise platform handles multiple clinical samples such as whole blood, serum, and saliva without sample preprocessing under diverse conditions of temperature, pH, and ionic strength. The NE(2)RD's broad dynamic range, detection limit, and portability integrated with a disposable fluidic chip have broad applications, potentially enabling the transition toward precision medicine at the point-of-care or primary care settings and at patients' homes.
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131
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Koh LD, Cheng Y, Teng CP, Khin YW, Loh XJ, Tee SY, Low M, Ye E, Yu HD, Zhang YW, Han MY. Structures, mechanical properties and applications of silk fibroin materials. Prog Polym Sci 2015. [DOI: 10.1016/j.progpolymsci.2015.02.001] [Citation(s) in RCA: 608] [Impact Index Per Article: 67.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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132
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Elia R, Guo J, Budijono S, Normand V, Benczédi D, Omenetto F, Kaplan DL. Encapsulation of Volatile Compounds in Silk Microparticles. JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH 2015; 12:793-799. [PMID: 26568787 PMCID: PMC4640459 DOI: 10.1007/s11998-015-9668-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Various techniques have been employed to entrap fragrant oils within microcapsules or microparticles in the food, pharmaceutical, and chemical industries for improved stability and delivery. In the present work we describe the use of silk protein microparticles for encapsulating fragrant oils using ambient processing conditions to form an all-natural biocompatible matrix. These microparticles are stabilized via physical crosslinking, requiring no chemical agents, and are prepared with aqueous and ambient processing conditions using polyvinyl alcohol-silk emulsions. The particles were loaded with fragrant oils via direct immersion of the silk particles within an oil bath. The oil-containing microparticles were coated using alternating silk and polyethylene oxide layers to control the release of the oil from the microspheres. Particle morphology and size, oil loading capacity, release rates as well as silk-oil interactions and coating treatments were characterized. Thermal analysis demonstrated that the silk coatings can be tuned to alter both retention and release profiles of the encapsulated fragrance. These oil containing particles demonstrate the ability to adsorb and controllably release oils, suggesting a range of potential applications including cosmetic and fragrance utility.
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Affiliation(s)
- Roberto Elia
- Department of Biomedical Engineering, Tufts University, Medford, Massachusetts 02155
| | - Jin Guo
- Department of Biomedical Engineering, Tufts University, Medford, Massachusetts 02155
| | | | | | - Daniel Benczédi
- Firmenich SA, 1, Route des Jeunes, 1211 Geneva 8, Switzerland
| | - Fiorenzo Omenetto
- Department of Biomedical Engineering, Tufts University, Medford, Massachusetts 02155
| | - David L Kaplan
- Department of Biomedical Engineering, Tufts University, Medford, Massachusetts 02155
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133
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Copeland CG, Bell BE, Christensen CD, Lewis RV. Development of a Process for the Spinning of Synthetic Spider Silk. ACS Biomater Sci Eng 2015; 1:577-584. [PMID: 27064312 DOI: 10.1021/acsbiomaterials.5b00092] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Spider silks have unique mechanical properties but current efforts to duplicate those properties with recombinant proteins have been unsuccessful. This study was designed to develop a single process to spin fibers with excellent and consistent mechanical properties. As-spun fibers produced were brittle, but by stretching the fibers the mechanical properties were greatly improved. A water-dip or water-stretch further increased the strength and elongation of the synthetic spider silk fibers. Given the promising results of the water stretch, a mechanical double-stretch system was developed. Both a methanol/water mixture and an isopropanol/water mixture were independently used to stretch the fibers with this system. It was found that the methanol mixture produced fibers with high tensile strength while the isopropanol mixture produced fibers with high elongation.
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Affiliation(s)
- Cameron G Copeland
- Department of Biological Engineering and Synthetic Biomanufacturing Center, Utah State University, 650 East 1600 North, Logan, Utah 84341, United States
| | - Brianne E Bell
- Department of Biological Engineering and Synthetic Biomanufacturing Center, Utah State University, 650 East 1600 North, Logan, Utah 84341, United States
| | - Chad D Christensen
- Department of Biological Engineering and Synthetic Biomanufacturing Center, Utah State University, 650 East 1600 North, Logan, Utah 84341, United States
| | - Randolph V Lewis
- Department of Biological Engineering and Synthetic Biomanufacturing Center, Utah State University, 650 East 1600 North, Logan, Utah 84341, United States
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134
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Li X, Qin J, Ma J. Silk fibroin/poly (vinyl alcohol) blend scaffolds for controlled delivery of curcumin. Regen Biomater 2015; 2:97-105. [PMID: 26816634 PMCID: PMC4669022 DOI: 10.1093/rb/rbv008] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Revised: 04/22/2015] [Accepted: 05/01/2015] [Indexed: 11/12/2022] Open
Abstract
A silk fibroin/poly (vinyl alcohol) porous scaffold with a water vapor transmission rate of 2125 ± 464 g/m2/day has been developed via thermally induced phase separation (gelation) and freeze-drying process. A hierarchical architecture of micropores and nanofibers was observed inside the scaffolds, and the related structures were analyzed. The viability and proliferation of 3T3 fibroblasts were examined, which indicated that the scaffolds exerted low cytotoxicity. After loading curcumin, the scaffolds can suppress the growth of 3T3 fibroblasts. The release behavior of curcumin from the scaffolds was investigated. At pH = 7.2, the release profiles showed no significant difference for the loading amounts of 0.5 mg and 0.25 mg per sample. Meanwhile, the cumulative amount of released drug at pH = 5.7 was significantly more than that in neutral solution due to more degradation of the scaffolds. It was suggested that the silk fibroin/poly (vinyl alcohol) blend scaffolds could be potentially used as wound dressing materials.
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Affiliation(s)
- Xiaomeng Li
- Advanced Biomaterials and Tissue Engineering Center, Huazhong University of Science and Technology, Wuhan 430074, China; Department of Biomedical Engineering, School of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jinli Qin
- Advanced Biomaterials and Tissue Engineering Center, Huazhong University of Science and Technology, Wuhan 430074, China; Department of Biomedical Engineering, School of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jun Ma
- Advanced Biomaterials and Tissue Engineering Center, Huazhong University of Science and Technology, Wuhan 430074, China; Department of Biomedical Engineering, School of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
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135
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Atterberry PN, Roark TJ, Severt SY, Schiller ML, Antos JM, Murphy AR. Sustained Delivery of Chemokine CXCL12 from Chemically Modified Silk Hydrogels. Biomacromolecules 2015; 16:1582-9. [PMID: 25894928 DOI: 10.1021/acs.biomac.5b00144] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A delivery platform was developed using silk-based hydrogels, and sustained delivery of the cationic chemokine CXCL12 at therapeutically relevant doses is demonstrated. Hydrogels were prepared from plain silk and silk that had been chemically modified with sulfonic acid groups. CXCL12 was mixed with the silk solution prior to gelation, resulting in 100% encapsulation efficiency, and both hydrated and lyophilized gels were compared. By attaching a fluorescein tag to CXCL12 using a site-specific sortase-mediated enzymatic ligation, release was easily quantified in a high-throughput manner using fluorescence spectroscopy. CXCL12 continually eluted from both plain and acid-modified silk hydrogels for more than 5 weeks at concentrations ranging from 10 to 160 ng per day, depending on the gel preparation method. Notably, acid-modified silk hydrogels displayed minimal burst release yet had higher long-term release rates compared to those of plain silk hydrogels. Similar release profiles were observed over a range of loading capacities, allowing dosage to be easily varied.
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Affiliation(s)
- Paige N Atterberry
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
| | - Travis J Roark
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
| | - Sean Y Severt
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
| | - Morgan L Schiller
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
| | - John M Antos
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
| | - Amanda R Murphy
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, United States
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136
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Leng X, Liu B, Su B, Liang M, Shi L, Li S, Qu S, Fu X, Liu Y, Yao M, Kaplan DL, Wang Y, Wang X. In situ
ultrasound imaging of silk hydrogel degradation and neovascularization. J Tissue Eng Regen Med 2015; 11:822-830. [PMID: 25850825 DOI: 10.1002/term.1981] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2013] [Revised: 07/31/2014] [Accepted: 11/28/2014] [Indexed: 11/08/2022]
Affiliation(s)
- Xiaoping Leng
- Department of Ultrasound; Second Affiliated Hospital of Harbin Medical University, Key Laboratory of Myocardial Ischaemia, Chinese Ministry of Education; Harbin People's Republic of China
| | - Bin Liu
- Department of Reproductive Medicine; First Affiliated Hospital of Harbin Medical University; People's Republic of China
| | - Bo Su
- Department of Spine Surgery; Second Affiliated Hospital of Harbin Medical University; People's Republic of China
| | - Min Liang
- Department of Spine Surgery; Second Affiliated Hospital of Harbin Medical University; People's Republic of China
| | - Liangchen Shi
- Department of Spine Surgery; Second Affiliated Hospital of Harbin Medical University; People's Republic of China
| | - Shouqiang Li
- Department of Ultrasound; Second Affiliated Hospital of Harbin Medical University, Key Laboratory of Myocardial Ischaemia, Chinese Ministry of Education; Harbin People's Republic of China
| | - Shaohui Qu
- Department of Ultrasound; Second Affiliated Hospital of Harbin Medical University, Key Laboratory of Myocardial Ischaemia, Chinese Ministry of Education; Harbin People's Republic of China
| | - Xin Fu
- Department of Ultrasound; Second Affiliated Hospital of Harbin Medical University, Key Laboratory of Myocardial Ischaemia, Chinese Ministry of Education; Harbin People's Republic of China
| | - Yue Liu
- Department of Ultrasound; Second Affiliated Hospital of Harbin Medical University, Key Laboratory of Myocardial Ischaemia, Chinese Ministry of Education; Harbin People's Republic of China
| | - Meng Yao
- Department of Spine Surgery; Second Affiliated Hospital of Harbin Medical University; People's Republic of China
| | - David L. Kaplan
- Department of Biomedical Engineering; Tufts University; Medford MA USA
| | - Yansong Wang
- Department of Spine Surgery; Second Affiliated Hospital of Harbin Medical University; People's Republic of China
| | - Xiaoqin Wang
- Department of Biomedical Engineering; Tufts University; Medford MA USA
- National Engineering Laboratory for Modern Silk; Soochow University; Suzhou People's Republic of China
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137
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Jones JA, Harris TI, Tucker CL, Berg KR, Christy SY, Day BA, Gaztambide DA, Needham NJC, Ruben AL, Oliveira PF, Decker RE, Lewis RV. More Than Just Fibers: An Aqueous Method for the Production of Innovative Recombinant Spider Silk Protein Materials. Biomacromolecules 2015; 16:1418-25. [DOI: 10.1021/acs.biomac.5b00226] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Justin A. Jones
- Departments
of Biology, ‡Biological Engineering, §Nutrition, Dietetics, and Food Sciences, and ∥Health, Physical
Education, and Recreation, Utah State University, Logan, Utah 84322, United States
| | - Thomas I. Harris
- Departments
of Biology, ‡Biological Engineering, §Nutrition, Dietetics, and Food Sciences, and ∥Health, Physical
Education, and Recreation, Utah State University, Logan, Utah 84322, United States
| | - Chauncey L. Tucker
- Departments
of Biology, ‡Biological Engineering, §Nutrition, Dietetics, and Food Sciences, and ∥Health, Physical
Education, and Recreation, Utah State University, Logan, Utah 84322, United States
| | - Kyle R. Berg
- Departments
of Biology, ‡Biological Engineering, §Nutrition, Dietetics, and Food Sciences, and ∥Health, Physical
Education, and Recreation, Utah State University, Logan, Utah 84322, United States
| | - Stacia Y. Christy
- Departments
of Biology, ‡Biological Engineering, §Nutrition, Dietetics, and Food Sciences, and ∥Health, Physical
Education, and Recreation, Utah State University, Logan, Utah 84322, United States
| | - Breton A. Day
- Departments
of Biology, ‡Biological Engineering, §Nutrition, Dietetics, and Food Sciences, and ∥Health, Physical
Education, and Recreation, Utah State University, Logan, Utah 84322, United States
| | - Danielle A. Gaztambide
- Departments
of Biology, ‡Biological Engineering, §Nutrition, Dietetics, and Food Sciences, and ∥Health, Physical
Education, and Recreation, Utah State University, Logan, Utah 84322, United States
| | - Nate J. C. Needham
- Departments
of Biology, ‡Biological Engineering, §Nutrition, Dietetics, and Food Sciences, and ∥Health, Physical
Education, and Recreation, Utah State University, Logan, Utah 84322, United States
| | - Ashley L. Ruben
- Departments
of Biology, ‡Biological Engineering, §Nutrition, Dietetics, and Food Sciences, and ∥Health, Physical
Education, and Recreation, Utah State University, Logan, Utah 84322, United States
| | - Paula F. Oliveira
- Departments
of Biology, ‡Biological Engineering, §Nutrition, Dietetics, and Food Sciences, and ∥Health, Physical
Education, and Recreation, Utah State University, Logan, Utah 84322, United States
| | - Richard E. Decker
- Departments
of Biology, ‡Biological Engineering, §Nutrition, Dietetics, and Food Sciences, and ∥Health, Physical
Education, and Recreation, Utah State University, Logan, Utah 84322, United States
| | - Randolph V. Lewis
- Departments
of Biology, ‡Biological Engineering, §Nutrition, Dietetics, and Food Sciences, and ∥Health, Physical
Education, and Recreation, Utah State University, Logan, Utah 84322, United States
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138
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Samal SK, Dash M, Shelyakova T, Declercq HA, Uhlarz M, Bañobre-López M, Dubruel P, Cornelissen M, Herrmannsdörfer T, Rivas J, Padeletti G, De Smedt S, Braeckmans K, Kaplan DL, Dediu VA. Biomimetic magnetic silk scaffolds. ACS APPLIED MATERIALS & INTERFACES 2015; 7:6282-92. [PMID: 25734962 DOI: 10.1021/acsami.5b00529] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Magnetic silk fibroin protein (SFP) scaffolds integrating magnetic materials and featuring magnetic gradients were prepared for potential utility in magnetic-field assisted tissue engineering. Magnetic nanoparticles (MNPs) were introduced into SFP scaffolds via dip-coating methods, resulting in magnetic SFP scaffolds with different strengths of magnetization. Magnetic SFP scaffolds showed excellent hyperthermia properties achieving temperature increases up to 8 °C in about 100 s. The scaffolds were not toxic to osteogenic cells and improved cell adhesion and proliferation. These findings suggest that tailored magnetized silk-based biomaterials can be engineered with interesting features for biomaterials and tissue-engineering applications.
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Affiliation(s)
- Sangram K Samal
- †Consiglio Nazionale delle Ricerche-Institute for Nanostructured Materials, I-40129 Bologna-Roma, Italy
- ‡Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States
- §Laboratory of General Biochemistry and Physical Pharmacy, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
| | | | - Tatiana Shelyakova
- ⊥Laboratory of Biomechanics and Technology Innovation, NABI, Rizzoli Orthopaedic Institute, 40136 Bologna, Italy
| | - Heidi A Declercq
- #Department of Basic Medical Science - Tissue Engineering Group, Ghent University, De Pintelaan 185 (6B3), 9000 Ghent, Belgium
| | - Marc Uhlarz
- ∇Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany
| | - Manuel Bañobre-López
- ○International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga, 4715-330 Braga, Portugal
| | | | - Maria Cornelissen
- #Department of Basic Medical Science - Tissue Engineering Group, Ghent University, De Pintelaan 185 (6B3), 9000 Ghent, Belgium
| | - Thomas Herrmannsdörfer
- ∇Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany
| | - Jose Rivas
- ○International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga, 4715-330 Braga, Portugal
| | - Giuseppina Padeletti
- †Consiglio Nazionale delle Ricerche-Institute for Nanostructured Materials, I-40129 Bologna-Roma, Italy
| | - Stefaan De Smedt
- §Laboratory of General Biochemistry and Physical Pharmacy, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
| | - Kevin Braeckmans
- §Laboratory of General Biochemistry and Physical Pharmacy, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
| | - David L Kaplan
- ‡Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, Massachusetts 02155, United States
| | - V Alek Dediu
- †Consiglio Nazionale delle Ricerche-Institute for Nanostructured Materials, I-40129 Bologna-Roma, Italy
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139
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Wang HY, Zhang YQ. Processing silk hydrogel and its applications in biomedical materials. Biotechnol Prog 2015; 31:630-40. [DOI: 10.1002/btpr.2058] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2014] [Revised: 02/02/2015] [Indexed: 12/11/2022]
Affiliation(s)
- Hai-Yan Wang
- Silk Biotechnology Laboratory, School of Basic Medical and Biological Sciences; Soochow University; Suzhou 215123 P R China
| | - Yu-Qing Zhang
- Silk Biotechnology Laboratory, School of Basic Medical and Biological Sciences; Soochow University; Suzhou 215123 P R China
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140
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Sustained release and stabilization of therapeutic antibodies using amphiphilic polyanhydride nanoparticles. Chem Eng Sci 2015. [DOI: 10.1016/j.ces.2014.08.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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141
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Yang MH, Chung TW, Lu YS, Chen YL, Tsai WC, Jong SB, Yuan SS, Liao PC, Lin PC, Tyan YC. Activation of the ubiquitin proteasome pathway by silk fibroin modified chitosan nanoparticles in hepatic cancer cells. Int J Mol Sci 2015; 16:1657-76. [PMID: 25588218 PMCID: PMC4307326 DOI: 10.3390/ijms16011657] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2014] [Accepted: 01/06/2015] [Indexed: 12/20/2022] Open
Abstract
Silk fibroin (SF) is a protein with bulky hydrophobic domains and can be easily purified as sericin-free silk-based biomaterial. Silk fibroin modified chitosan nanoparticle (SF-CSNP), a biocompatible material, has been widely used as a potential drug delivery system. Our current investigation studied the bio-effects of the SF-CSNP uptake by liver cells. In this experiment, the characterizations of SF-CSNPs were measured by particle size analysis and protein assay. The average size of the SF-CSNP was 311.9 ± 10.7 nm, and the average zeta potential was +13.33 ± 0.3 mV. The SF coating on the SF-CSNP was 6.27 ± 0.17 μg/mL. Moreover, using proteomic approaches, several proteins involved in the ubiquitin proteasome pathway were identified by analysis of differential protein expressions of HepG2 cell uptake the SF-CSNP. Our experimental results have demonstrated that the SF-CSNP may be involved in liver cancer cell survival and proliferation.
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Affiliation(s)
- Ming-Hui Yang
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan.
| | - Tze-Wen Chung
- Department of Biomedical Engineering, National Yang-Ming University, Taipei 112, Taiwan.
| | - Yi-Shan Lu
- Department of Medical Imaging and Radiological Sciences, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
| | - Yi-Ling Chen
- Department of Nuclear Medicine, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan.
| | - Wan-Chi Tsai
- Department of Medical Laboratory Science and Biotechnology, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
| | - Shiang-Bin Jong
- Department of Medical Imaging and Radiological Sciences, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
| | - Shyng-Shiou Yuan
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan.
| | - Pao-Chi Liao
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan.
| | - Po-Chiao Lin
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan.
| | - Yu-Chang Tyan
- Translational Research Center, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan.
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142
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de Moraes MA, Albrecht Mahl CR, Ferreira Silva M, Beppu MM. Formation of silk fibroin hydrogel and evaluation of its drug release profile. J Appl Polym Sci 2015. [DOI: 10.1002/app.41802] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mariana Agostini de Moraes
- Department of Materials and Bioprocess Engineering; School of Chemical Engineering, University of Campinas; UNICAMP 13083-852 Campinas-SP Brazil
- Department of Exact and Earth Sciences; Federal University of São Paulo; UNIFESP Diadema-SP Brazil
| | - Cynthia Regina Albrecht Mahl
- Department of Materials and Bioprocess Engineering; School of Chemical Engineering, University of Campinas; UNICAMP 13083-852 Campinas-SP Brazil
| | - Mariana Ferreira Silva
- Department of Materials and Bioprocess Engineering; School of Chemical Engineering, University of Campinas; UNICAMP 13083-852 Campinas-SP Brazil
| | - Marisa Masumi Beppu
- Department of Materials and Bioprocess Engineering; School of Chemical Engineering, University of Campinas; UNICAMP 13083-852 Campinas-SP Brazil
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143
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Wang X, Partlow B, Liu J, Zheng Z, Su B, Wang Y, Kaplan DL. Injectable silk-polyethylene glycol hydrogels. Acta Biomater 2015; 12:51-61. [PMID: 25449912 DOI: 10.1016/j.actbio.2014.10.027] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 09/14/2014] [Accepted: 10/20/2014] [Indexed: 11/19/2022]
Abstract
Silk hydrogels for tissue repair are usually pre-formed via chemical or physical treatments from silk solutions. For many medical applications, it is desirable to utilize injectable silk hydrogels at high concentrations (>8%) to avoid surgical implantation and to achieve slow in vivo degradation of the gel. In the present study, injectable silk solutions that formed hydrogels in situ were generated by mixing silk with low-molecular-weight polyethylene glycol (PEG), especially PEG300 and 400 (molecular weight 300 and 400g mol(-1)). Gelation time was dependent on the concentration and molecular weight of PEG. When the concentration of PEG in the gel reached 40-45%, gelation time was less than 30min, as revealed by measurements of optical density and rheological studies, with kinetics of PEG400 faster than PEG300. Gelation was accompanied by structural changes in silk, leading to the conversion from random coil in solution to crystalline β-sheets in the gels, based on circular dichroism, attenuated total reflection Fourier transform infrared spectroscopy and X-ray diffraction. The modulus (127.5kPa) and yield strength (11.5kPa) determined were comparable to those of sonication-induced hydrogels at the same concentrations of silk. The time-dependent injectability of 15% PEG-silk hydrogel through 27G needles showed a gradual increase of compression forces from ∼10 to 50N within 60min. The growth of human mesenchymal stem cells on the PEG-silk hydrogels was hindered, likely due to the presence of PEG, which grew after a 5 day delay, presumably while the PEG solubilized away from the gel. When 5% PEG-silk hydrogel was subcutaneously injected in rats, significant degradation and tissue in-growth took place after 20 days, as revealed by ultrasound imaging and histological analysis. No significant inflammation around the gel was observed. The features of injectability, slow degradation and low initial cell attachment suggests that these PEG-silk hydrogels are of interest for many biomedical applications, such as anti-fouling and anti-adhesion.
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Affiliation(s)
- Xiaoqin Wang
- National Engineering Laboratory for Modern Silk, Soochow University, Suzhou 215123, China; Department of Biomedical Engineering, Tufts University, Medford, MA 02155, USA.
| | - Benjamin Partlow
- National Engineering Laboratory for Modern Silk, Soochow University, Suzhou 215123, China; Department of Biomedical Engineering, Tufts University, Medford, MA 02155, USA
| | - Jian Liu
- National Engineering Laboratory for Modern Silk, Soochow University, Suzhou 215123, China
| | - Zhaozhu Zheng
- National Engineering Laboratory for Modern Silk, Soochow University, Suzhou 215123, China
| | - Bo Su
- Department of Spine Surgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
| | - Yansong Wang
- Department of Spine Surgery, The Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China.
| | - David L Kaplan
- National Engineering Laboratory for Modern Silk, Soochow University, Suzhou 215123, China; Department of Biomedical Engineering, Tufts University, Medford, MA 02155, USA
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144
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Zhou W, Feng Y, Yang J, Fan J, Lv J, Zhang L, Guo J, Ren X, Zhang W. Electrospun scaffolds of silk fibroin and poly(lactide-co-glycolide) for endothelial cell growth. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2015; 26:5386. [PMID: 25601671 DOI: 10.1007/s10856-015-5386-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Accepted: 09/12/2014] [Indexed: 06/04/2023]
Abstract
Electrospun scaffolds of silk fibroin (SF) and poly(lactide-co-glycolide) (PLGA) were prepared to mimic the morphology and chemistry of the extracellular matrix. The SF/PLGA scaffolds were treated with ethanol to improve their usability. After ethanol treatment the scaffolds exhibited a smooth surface and uniform fibers. SF transformed from random coil conformation to β-sheet structure after ethanol treatment, so that the SF/PLGA scaffolds showed low hydrophilicity and dissolving rate in water. The mechanical properties and the hydrophilicity of the blended fibrous scaffolds were affected by the weight ratio of SF and PLGA. During degradation of ethanol-treated SF/PLGA scaffolds in vitro, the fibers became thin along with the degradation time. Human umbilical vein endothelial cells (HUVECs) were seeded onto the ethanol-treated nanofibrous scaffolds for cell viability, attachment and morphogenesis studies. These SF/PLGA scaffolds could enhance the viability, spreading and attachment of HUVECs. Based on these results, these ethanol-treated scaffolds are proposed to be a good candidate for endothelial cell growth.
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Affiliation(s)
- Wei Zhou
- School of Chemical Engineering and Technology, Tianjin University, Weijin Road 92, Nankai District, Tianjin, 300072, China
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145
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Bie S, Ming J, Zhou Y, Zhong T, Zhang F, Zuo B. Rapid formation of flexible silk fibroin gel-like films. J Appl Polym Sci 2014. [DOI: 10.1002/app.41842] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Shiyu Bie
- National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering; Soochow University; Suzhou 215123 China
| | - Jinfa Ming
- National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering; Soochow University; Suzhou 215123 China
| | - Yan Zhou
- Suzhou Institute of Trade & Commerce; Suzhou 215009 China
| | - Tianyi Zhong
- National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering; Soochow University; Suzhou 215123 China
| | - Feng Zhang
- Jiangsu Province Key Laboratory of Stem Cell Research; Medical College, Soochow University; Suzhou 215123 China
| | - Baoqi Zuo
- National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering; Soochow University; Suzhou 215123 China
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146
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Elia R, Michelson CD, Perera AL, Brunner TF, Harsono M, Leisk GG, Kugel G, Kaplan DL. Electrodeposited silk coatings for bone implants. J Biomed Mater Res B Appl Biomater 2014; 103:1602-9. [PMID: 25545462 DOI: 10.1002/jbm.b.33351] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Revised: 10/29/2014] [Accepted: 11/18/2014] [Indexed: 11/07/2022]
Abstract
The aim of this study was to characterize the mechanical properties and drug elution features of silk protein-based electrodeposited dental implant coatings. Silk processing conditions were modified to obtain coatings with a range of mechanical properties on titanium studs. These coatings were assessed for adhesive strength and dissolution, with properties tuned using water vapor annealing or glycerol incorporation to modulate crystalline content. Coating reproducibility was demonstrated over a range of silk concentrations from 1% to 10%. Surface roughness of titanium substrates was altered using industry relevant acid etching and grit blasting, and the effect of surface topography on silk coating adhesion was assessed. Florescent compounds were incorporated into the silk coatings, which were modulated for crystalline content, to achieve four days of sustained release of the compounds. This silk electrogelation technique offers a safe and relatively simple approach to generate mechanically robust, biocompatible, and degradable implant coatings that can also be functionalized with bioactive compounds to modulate the local regenerative tissue environment.
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Affiliation(s)
- Roberto Elia
- Department of Biomedical Engineering, Tufts University, Medford, Massachusetts, 02155
| | | | - Austin L Perera
- School of Dental Medicine, Tufts University, Boston, Massachusetts, 02111
| | - Teresa F Brunner
- Department of Biomedical Engineering, Tufts University, Medford, Massachusetts, 02155
- Department of Maxilo-Facial Surgery University Hospital Rechts der Isar, Technical University of Munich, Munich, Germany, 81675
| | - Masly Harsono
- School of Dental Medicine, Tufts University, Boston, Massachusetts, 02111
| | - Gray G Leisk
- Department of Mechanical Engineering, Tufts University, Medford, Massachusetts, 02155
| | - Gerard Kugel
- School of Dental Medicine, Tufts University, Boston, Massachusetts, 02111
| | - David L Kaplan
- Department of Biomedical Engineering, Tufts University, Medford, Massachusetts, 02155
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147
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Zhou J, Zhang B, Shi L, Zhong J, Zhu J, Yan J, Wang P, Cao C, He D. Regenerated silk fibroin films with controllable nanostructure size and secondary structure for drug delivery. ACS APPLIED MATERIALS & INTERFACES 2014; 6:21813-21821. [PMID: 25536875 DOI: 10.1021/am502278b] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The ability of drug release from SF materials was governed largely by their secondary structure. It is known that the breakage degree of the peptide chain during the silk fibroin (SF) dissolution can affect the structure, property, and applications of SF materials. To deeply understand this effect, we designed a reaction system based on CaCl2/H2O/C2H5OH ternary solvent with different ethanol content to obtain the regenerated SF films with different morphologies and secondary structures. The results showed that the globule-like nanostructure was observed in all regenerated SF films, and their size decreased significantly with reducing the ethanol content in the solvent. Correspondingly, the β-sheet structure content of the SF films increased. In addition, the contact angle and the elongation ratio increased, and water absorption decreased significantly with decreasing the ethanol content in the solvent. The accumulated release percents of doxorubicin from these SF films were significantly different with increasing the time. With smaller nanostructure size and more β-sheet content, the SF films had a slower drug release at the beginning. This study indicated the importance of the ethanol content in the solvent in controlling the structure and properties of the regenerated SF films, which would improve the application of SF in drug delivery.
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Affiliation(s)
- Juan Zhou
- National Engineering Research Center for Nanotechnology, Shanghai 200241, People's Republic of China
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148
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Silk as an innovative biomaterial for cancer therapy. Rep Pract Oncol Radiother 2014; 20:87-98. [PMID: 25859397 DOI: 10.1016/j.rpor.2014.11.010] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Accepted: 11/25/2014] [Indexed: 12/21/2022] Open
Abstract
Silk has been used for centuries in the textile industry and as surgical sutures. In addition to its unique mechanical properties, silk possesses other properties, such as biocompatibility, biodegradability and ability to self-assemble, which make it an interesting material for biomedical applications. Although silk forms only fibers in nature, synthetic techniques can be used to control the processing of silk into different morphologies, such as scaffolds, films, hydrogels, microcapsules, and micro- and nanospheres. Moreover, the biotechnological production of silk proteins broadens the potential applications of silk. Synthetic silk genes have been designed. Genetic engineering enables modification of silk properties or the construction of a hybrid silk. Bioengineered hybrid silks consist of a silk sequence that self-assembles into the desired morphological structure and the sequence of a polypeptide that confers a function to the silk biomaterial. The functional domains can comprise binding sites for receptors, enzymes, drugs, metals or sugars, among others. Here, we review the current status of potential applications of silk biomaterials in the field of oncology with a focus on the generation of implantable, injectable and targeted drug delivery systems and the three-dimensional cancer models based on silk scaffolds for cancer research. However, the systems described could be applied in many biomedical fields.
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149
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Elia R, Michelson CD, Perera AL, Harsono M, Leisk GG, Kugel G, Kaplan DL. Silk electrogel coatings for titanium dental implants. J Biomater Appl 2014; 29:1247-55. [PMID: 25425563 DOI: 10.1177/0885328214561536] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The aim of this study was to develop biocompatible, biodegradable dental implant coatings capable of withstanding the mechanical stresses imparted during implant placement. Two techniques were developed to deposit uniform silk fibroin protein coatings onto dental implants. Two novel coating techniques were implemented to coat titanium shims, studs, and implants. One technique involved electrodeposition of the silk directly onto the titanium substrates. The second technique consisted of melting electrogels and dispensing the melted gels onto the titanium to form the coatings. Both techniques were tested for coating reproducibility using a stylus profilometer and a dial thickness gauge. The mechanical strength of adhered titanium studs was assessed using a universal mechanical testing machine. Uniform, controllable coatings were obtained from both the electrodeposition and melted electrogel coating techniques, tunable from 35 to 1654 µm thick under the conditions studied, and able to withstand delamination during implantation into implant socket mimics. Mechanical testing revealed that the adhesive strength of electrogel coatings, 0.369 ± 0.09 MPa, rivaled other biologically derived coating systems such as collagen, hydroxyapatite, and chitosan (0.07-4.83 MPa). These novel silk-based techniques offer a unique approach to the deposition of safe, simple, mechanically robust, biocompatible, and degradable implant coatings.
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Affiliation(s)
- Roberto Elia
- Department of Biomedical Engineering, Tufts University Medford, Massachusetts, USA
| | | | - Austin L Perera
- School of Dental Medicine, Tufts University Boston, Massachusetts, USA
| | - Masly Harsono
- School of Dental Medicine, Tufts University Boston, Massachusetts, USA
| | - Gray G Leisk
- Department of Mechanical Engineering, Tufts University Medford, Massachusetts, USA
| | - Gerard Kugel
- School of Dental Medicine, Tufts University Boston, Massachusetts, USA
| | - David L Kaplan
- Department of Biomedical Engineering, Tufts University Medford, Massachusetts, USA
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150
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Sampath Kumar T, Madhumathi K, Rajkamal B, Zaheatha S, Rajathi Malar A, Alamelu Bai S. Enhanced protein delivery by multi-ion containing eggshell derived apatitic-alginate composite nanocarriers. Colloids Surf B Biointerfaces 2014; 123:542-8. [DOI: 10.1016/j.colsurfb.2014.09.052] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Revised: 08/26/2014] [Accepted: 09/25/2014] [Indexed: 11/25/2022]
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