1
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Presence of β-Turn Structure in Recombinant Spider Silk Dissolved in Formic Acid Revealed with NMR. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27020511. [PMID: 35056828 PMCID: PMC8778467 DOI: 10.3390/molecules27020511] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/10/2022] [Accepted: 01/12/2022] [Indexed: 11/23/2022]
Abstract
Spider dragline silk is a biopolymer with excellent mechanical properties. The development of recombinant spider silk protein (RSP)-based materials with these properties is desirable. Formic acid (FA) is a spinning solvent for regenerated Bombyx mori silk fiber with excellent mechanical properties. To use FA as a spinning solvent for RSP with the sequence of major ampullate spider silk protein from Araneus diadematus, we determined the conformation of RSP in FA using solution NMR to determine the role of FA as a spinning solvent. We assigned 1H, 13C, and 15N chemical shifts to 32-residue repetitive sequences, including polyAla and Gly-rich regions of RSP. Chemical shift evaluation revealed that RSP is in mainly random coil conformation with partially type II β-turn structure in the Gly-Pro-Gly-X motifs of the Gly-rich region in FA, which was confirmed by the 15N NOE data. In addition, formylation at the Ser OH groups occurred in FA. Furthermore, we evaluated the conformation of the as-cast film of RSP dissolved in FA using solid-state NMR and found that β-sheet structure was predominantly formed.
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2
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Chen J, Tsuchiya K, Masunaga H, Malay AD, Numata K. A silk composite fiber reinforced by telechelic-type polyalanine and its strengthening mechanism. Polym Chem 2022. [DOI: 10.1039/d2py00030j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A telechelic-type polyalanine was doped in silkworm silk fibroins to prepare reinforced composite fibers, which exhibited 42% and 51% higher mechanical properties than silk-only fibers in terms of tensile strength and toughness, respectively.
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Affiliation(s)
- Jianming Chen
- Biomacromolecules Research Team, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Kousuke Tsuchiya
- Department of Material Chemistry, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Hiroyasu Masunaga
- Japan Synchrotron Radiation Research Institute, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Ali D. Malay
- Biomacromolecules Research Team, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Keiji Numata
- Biomacromolecules Research Team, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Material Chemistry, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
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3
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Effect of pH on the Conformational Transition of Silk Fibroin in Aqueous Solution Monitored by Thioflavin-T Fluorescence. J Fluoresc 2021; 32:389-395. [PMID: 34855073 DOI: 10.1007/s10895-021-02841-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 10/20/2021] [Indexed: 10/19/2022]
Abstract
In this work, the potential application of the fluorescence dye Thioflavin-T (ThT), which can specifically bind to amyloid, as a powerful tool for monitoring secondary structural transitions of silk fibroin (SF) induced by pH in low solution concentrations was examined. Results showed that ThT emission intensities substantially increased when pH decreased from 6.8 to 4.8. This increase may be ascribed to conformational transitions from random coil to β-sheet. The morphology and secondary structure of SF were also investigated via TEM, AFM and circular dichroism spectroscopy. The information obtained herein can be utilized not only for the development of convenient and efficient noninvasive method for monitoring the assembly behavior of SF in aqueous solution but also for in vitro fluorescence imaging.
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4
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Asakura T, Ibe Y, Jono T, Naito A. Structure and dynamics of biodegradable polyurethane-silk fibroin composite materials in the dry and hydrated states studied using 13C solid-state NMR spectroscopy. Polym Degrad Stab 2021. [DOI: 10.1016/j.polymdegradstab.2021.109645] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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5
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Tanaka T, Ibe Y, Jono T, Tanaka R, Naito A, Asakura T. Characterization of a Water-Dispersed Biodegradable Polyurethane-Silk Composite Sponge Using 13C Solid-State Nuclear Magnetic Resonance as Coating Material for Silk Vascular Grafts with Small Diameters. Molecules 2021; 26:4649. [PMID: 34361802 PMCID: PMC8347230 DOI: 10.3390/molecules26154649] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 07/12/2021] [Accepted: 07/27/2021] [Indexed: 11/30/2022] Open
Abstract
Recently, Bombyx mori silk fibroin (SF) has been shown to be a suitable material for vascular prostheses for small arteries. In this study, we developed a softer SF graft by coating water-dispersed biodegradable polyurethane (PU) based on polycaprolactone and an SF composite sponge on the knitted SF vascular graft. Three kinds of 13C solid-state nuclear magnetic resonance (NMR), namely carbon-13 (13C) cross-polarization/magic angle spinning (MAS), 13C dipolar decoupled MAS, and 13C refocused insensitive nuclei enhanced by polarization transfer (r-INEPT) NMR, were used to characterize the PU-SF coating sponge. Especially the 13C r-INEPT NMR spectrum of water-dispersed biodegradable PU showed that both main components of the non-crystalline domain of PU and amorphous domain of SF were highly mobile in the hydrated state. Then, the small-diameter SF artificial vascular grafts coated with this sponge were evaluated through implantation experiments with rats. The implanted PU-SF-coated SF grafts showed a high patency rate. It was confirmed that the inside of the SF grafts was covered with vascular endothelial cells 4 weeks after implantation. These results showed that the water-dispersed biodegradable PU-SF-coated SF graft created in this study could be a strong candidate for small-diameter artificial vascular graft.
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Affiliation(s)
- Takashi Tanaka
- Department of Veterinary Science, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan; (T.T.); (R.T.)
| | - Yusuke Ibe
- Polyurethane Research Laboratory, Tosoh Corporation, Mie 510-8540, Japan; (Y.I.); (T.J.)
| | - Takaki Jono
- Polyurethane Research Laboratory, Tosoh Corporation, Mie 510-8540, Japan; (Y.I.); (T.J.)
| | - Ryo Tanaka
- Department of Veterinary Science, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan; (T.T.); (R.T.)
| | - Akira Naito
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Tokyo 184-8588, Japan;
| | - Tetsuo Asakura
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Tokyo 184-8588, Japan;
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6
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Hofmaier M, Urban B, Lentz S, Borkner CB, Scheibel T, Fery A, Müller M. Dichroic Fourier Transform Infrared Spectroscopy Characterization of the β-Sheet Orientation in Spider Silk Films on Silicon Substrates. J Phys Chem B 2021; 125:1061-1071. [PMID: 33433229 DOI: 10.1021/acs.jpcb.0c09395] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Orientation analysis of the β-sheet structure within films of the established recombinant spider silk protein eADF4(C16) was performed using a concept based on dichroic transmission- and attenuated total reflection-Fourier transform infrared spectroscopy, lineshape analysis, assignment of amide I components to specific vibration modes, and transition dipole moment directions of β-sheet structures. Based on the experimental dichroic ratio R, the order parameter S of β-sheet structures was calculated with respect to uniaxial orientation. Films of eADF4(C16) were deposited on untexturized (Si) and unidirectionally scratched silicon substrates (Si-sc) and post-treated with MeOH vapor. Freshly cast thin and thick eADF4(C16) films out of hexafluoroisopropanol featured β-sheet contents of ≈6%, which increased to >30% after MeOH post-treatment in dependence of time. Pseudo-first order folding kinetics were obtained, suggesting a transition from an unfolded to a folded state. In MeOH post-treated thin films with diameters in the nanometer range, a significant orientation of β-sheets was obtained regardless of the texturization of the silicon substrate (Si, Si-sc). This was rationalized by dichroic ratios of the amide I component at 1696 cm-1 assigned to the (0, π) mode of antiparallel β-sheet structures, whose transition dipole moment M is located in parallel to both β-sheet plane and chain direction. The calculated high molecular order parameter S ≈ 0.40 suggested vertically (out-of-plane) oriented antiparallel β-sheet stacks with tilt angles of γ ≈ 39° to the surface normal. Microscale (thick) films, in contrast, revealed low order parameters S ≈ 0. Scanning force microscopy on thin eADF4 films at silicon substrates showed dewetted polymer film structures rather at the micro-scale. These findings give new insights in the role of the β-sheet crystallite orientation for the mechanical properties of spider silk materials.
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Affiliation(s)
- Mirjam Hofmaier
- Institute of Physical Chemistry and Polymer Physics, Leibniz Institute of Polymer Research Dresden (IPF), Hohe Strasse 6, D-01069 Dresden, Germany.,Chair of Macromolecular Chemistry, Technical University of Dresden (TUD), Mommsenstraße 4, D-01062 Dresden, Germany
| | - Birgit Urban
- Institute of Physical Chemistry and Polymer Physics, Leibniz Institute of Polymer Research Dresden (IPF), Hohe Strasse 6, D-01069 Dresden, Germany
| | - Sarah Lentz
- Chair of Biomaterials, University of Bayreuth, Prof.-Rüdiger-Bormann-Str. 1, D-95447 Bayreuth, Germany
| | - Christian B Borkner
- Chair of Biomaterials, University of Bayreuth, Prof.-Rüdiger-Bormann-Str. 1, D-95447 Bayreuth, Germany
| | - Thomas Scheibel
- Chair of Biomaterials, University of Bayreuth, Prof.-Rüdiger-Bormann-Str. 1, D-95447 Bayreuth, Germany
| | - Andreas Fery
- Institute of Physical Chemistry and Polymer Physics, Leibniz Institute of Polymer Research Dresden (IPF), Hohe Strasse 6, D-01069 Dresden, Germany.,Chair of Physical Chemistry of Polymeric Materials, Technical University Dresden (TUD), D-01069 Dresden, Germany
| | - Martin Müller
- Institute of Physical Chemistry and Polymer Physics, Leibniz Institute of Polymer Research Dresden (IPF), Hohe Strasse 6, D-01069 Dresden, Germany.,Chair of Macromolecular Chemistry, Technical University of Dresden (TUD), Mommsenstraße 4, D-01062 Dresden, Germany
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7
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Djajamuliadi J, Ohgo K, Kumashiro KK. A Two-State Model Describes the Temperature-Dependent Conformational Equilibrium in the Alanine-Rich Domains in Elastin. J Phys Chem B 2020; 124:9017-9028. [PMID: 32936634 DOI: 10.1021/acs.jpcb.0c06811] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Elastin is the insoluble elastomeric protein that provides extensibility and resilience to vertebrate tissues. Limited high-resolution structural data for elastin are notably complex. To access this information, this protein is considered in the simplified context of its two general domain types, that is, hydrophobic (HP) and crosslinking (CL). The question of elastin's structure-function has directed the focus of nearly all previous studies in the literature to the unique repeating sequences characteristic of this protein, found primarily in the HP domains. The CL domains were assumed to play a very limited role in biological elasticity due in part to the significant α-helical character that was (incorrectly) predicted for these regions. In this study, the conformational heterogeneity of alanines in native elastin's CL domains is examined in the context of helix-coil transition theory (HCTT) using solid-state nuclear magnetic resonance (SSNMR) spectroscopy in tandem with strategic isotopic labeling. Helix and coil populations are observed at all temperatures, but the former increases significantly at lower temperatures. Below the glass transition temperature (Tg), two major populations of alanines in the CL regions are resolved by two-dimensional SSNMR; one-dimensional methods are used for characterization in nativelike conditions. The spectra of 13CO-Ala in the CL regions are simulated using an HCTT-based statistical mechanical representation. Below Tg, longer segments with significant helical probabilities are consistent with the experimental data. At higher temperatures, the SSNMR lineshapes are best fit with a distribution of shorter (Ala)n segments, most in random coil. These results are used to refine a structure-function model for elastin in the context of HCTT, redirecting attention to the CL domains and their role in elasticity.
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Affiliation(s)
- Jhonsen Djajamuliadi
- Department of Chemistry, University of Hawaii, 2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
| | - Kosuke Ohgo
- Department of Chemistry, University of Hawaii, 2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
| | - Kristin K Kumashiro
- Department of Chemistry, University of Hawaii, 2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
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8
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Composition and in silico structural analysis of fibroin from liquid silk of non-mulberry silkworm Antheraea assamensis. Int J Biol Macromol 2020; 163:1947-1958. [PMID: 32910960 DOI: 10.1016/j.ijbiomac.2020.08.232] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 08/28/2020] [Accepted: 08/29/2020] [Indexed: 11/24/2022]
Abstract
Silk is spun from the liquid precursor known as liquid silk secreted from the posterior part and stored in the silk gland lumen with occurrence of many momentary events. The liquid silk in the silk gland is transformed to the spun silk fibre. In this study the elucidation of the protein components of liquid silk from the posterior part of the silk gland (PSG) of saturniid silkworm Antheraea assamensis along with its structural characterization has been reported. The 3D model of the N-terminal amorphous portion with some repeat crystalline motifs (19-255) of core protein fibroin has also been constructed. 1D and 2D electrophoresis revealed the homo-dimeric structure of the silk protein. Secondary structure analysis by Circular dichroism, FTIR spectroscopy showed α helical structural component as predominant conformation in the liquid silk. The crystalline structure investigated through X ray diffraction (XRD) analysis also revealed the presence of less ordered amorphous α helical conformation in the liquid silk. The 3D structural model proposed of the residues from 19 to 255 has revealed structural stability throughout the molecular dynamics simulation process. This study will provide the detailed structural information and in silico analysis of the core protein present in the liquid silk of PSG.
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9
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Zhu H, Rising A, Johansson J, Zhang X, Lin Y, Zhang L, Yi T, Mi J, Meng Q. Tensile properties of synthetic pyriform spider silk fibers depend on the number of repetitive units as well as the presence of N- and C-terminal domains. Int J Biol Macromol 2020; 154:765-772. [DOI: 10.1016/j.ijbiomac.2020.03.042] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 03/04/2020] [Accepted: 03/06/2020] [Indexed: 12/21/2022]
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10
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Jia L, Zhang J, Liu S, Chen S, Zhu J. Visible sensing of conformational transition in model silk peptides based on a gold nanoparticles indicator. RSC Adv 2019; 9:40924-40932. [PMID: 35540090 PMCID: PMC9076423 DOI: 10.1039/c9ra05842g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Accepted: 11/27/2019] [Indexed: 11/21/2022] Open
Abstract
To understand protein structural transition and β-sheet formation is of importance in disparate areas such as silk protein processing and disease related β-amyloid behavior. Herein, GAGSGAGAGSGAGY (GY-14), a tetradecapeptide based on the crystallizable sequence of silk fibroin, was employed as a model peptide of the crystalline regions of silk fibroin. Due to the incorporation of tyrosine (Y), GY-14 was able to reduce Au3+ to Au NPs and further stabilize them without any external reducing or capping reagents to produce GY-14 stabilized Au NPs (GY-14@Au NPs). The in situ prepared GY-14@Au NPs were utilized as a built-in colorimetric indicator. The influences of specified physiological factors including decreasing the pH, the addition of calcium ions and isopropanol treatment on the self-assembly behavior of GY-14@Au NPs in aqueous solution have been studied. On the basis of transmission electron microscopy (TEM), dynamic light scattering (DLS), atomic force microscopy (AFM), Fourier transform infrared (FT-IR) spectroscopy and circular dichroism (CD) measurements, the color changes and the UV-Vis absorption peak shift of GY-14@Au NPs were attributed to the conformational change of the GY-14 peptide. The colorimetric readout can be seen with the naked eye, providing an efficient indicator to study the conformational changes of peptides exposed to various environmental stimuli.
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Affiliation(s)
- Lan Jia
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, College of Material Science and Engineering, Taiyuan University of TechnologyTaiyuan030024P. R. China
| | - Jiabing Zhang
- Department Pharmacy and Machinery, China Railway 12 Bureau Group Central HospitalTaiyuan030024P. R. China
| | - Sumei Liu
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, College of Material Science and Engineering, Taiyuan University of TechnologyTaiyuan030024P. R. China
| | - Song Chen
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, College of Material Science and Engineering, Taiyuan University of TechnologyTaiyuan030024P. R. China
| | - Jingxin Zhu
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, College of Material Science and Engineering, Taiyuan University of TechnologyTaiyuan030024P. R. China
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11
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Belton DJ, Plowright R, Kaplan DL, Perry CC. A robust spectroscopic method for the determination of protein conformational composition - Application to the annealing of silk. Acta Biomater 2018; 73:355-364. [PMID: 29649640 DOI: 10.1016/j.actbio.2018.03.058] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Revised: 03/19/2018] [Accepted: 03/30/2018] [Indexed: 01/26/2023]
Abstract
The physical and mechanical properties of structural proteins such as silk fibroin can be modified by controlled conformational change, which is regularly monitored by Fourier transform infrared spectroscopy by peak fitting of the amide I band envelope. Although many variables affecting peak shape are well established, there is no fixed methodology to compare and follow secondary structural differences without significant operator input especially where low frequency spectral noise is a problem. The aim of this contribution is to establish a method for such analyses to be carried at high levels of autonomy to prevent subjective or erroneous fitting. A range of approaches was trialled with optimal peak parameters selected based on overall goodness of fit and reproducibility of fit of replicate sample spectra. The method was successfully tested against reference proteins having contrasting β content and the rationale for parameter selection is presented. Further, we applied this method to measure the effect of conformational change on the energy of the amide I band of silk fibroin during annealing. Energy changes were ca. 400 kJ mol-1 of fibroin. To confirm that this energy change was a consequence of increased hydrogen bonding we used a Thioflavin T staining method typically used to identify β aggregate type structures in amyloid plaques. We propose that the approach described herein can aid in the development of silk based materials for biomedical applications where tuning of the physical and mechanical properties of the silk are needed to guarantee optimum activity. STATEMENT OF SIGNIFICANCE The physical and mechanical properties of proteins including silk fibroin can be modified by controlled structural change, which is regularly monitored by Fourier transform infrared spectroscopy (FTIR) by peak fitting of the amide I band. Currently there is no fixed methodology to compare and follow secondary structural differences without significant operator input leading to subjectivity and error. This contribution establishes a method for such analyses to be carried at high levels of autonomy applicable to a wide range of proteins and the conformational changes have been quantified as a single energy change output, which clearly shows the progression of the annealing process used. We propose that the approach can help in the development of silk based materials for biomedical applications where tuning of the physical and mechanical properties of the silk are needed to guarantee optimum activity.
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12
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Vieira S, Franco AR, Fernandes EM, Amorim S, Ferreira H, Pires RA, Reis RL, Martins A, Neves NM. Fish sarcoplasmic proteins as a high value marine material for wound dressing applications. Colloids Surf B Biointerfaces 2018; 167:310-317. [PMID: 29679807 DOI: 10.1016/j.colsurfb.2018.04.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 03/01/2018] [Accepted: 04/01/2018] [Indexed: 01/01/2023]
Abstract
Fish sarcoplasmic proteins (FSP) constitute around 25-30% of the total fish muscle protein. As the FSP are water soluble, FSP were isolated from fresh cod (Gadus morhua) by centrifugation. By SDS-PAGE, it was possible to determine the composition of FSP extracts (FSP-E). The FSP-E undergo denaturation at 44.12 ± 2.34° C, as characterized by differential scanning calorimetry thermograms (DSC). The secondary structure of FSP-E is mainly composed by α-helix structure, as determined by circular dichroism. The cytocompatibility of FSP-E, at concentrations ranging from 5 to 20 mg/mL, was investigated. Concentrations lower than 10 mg/mL have no cytotoxicity cultures of fibroblasts over 72 h. Further on, FSP membranes (FSP-M) were produced by spin coating to evaluate its properties. FSP-M shown having uniform surface as analyzed by Scanning Electron Microscopy (SEM). The relative amount of α-helix structures is higher when compared with the FSP-E. The FSP-M have higher temperature stability than the FSP-E, since they presented a denaturation temperature of 58.88 ± 3.36° C, according to the DSC analysis. FSP-M shown distinctive mechanical properties, with a stiffness of 16.57 ± 3.95 MPa and a yield strength of 23.85 ± 5.97 MPa. Human lung fibroblasts cell lines (MRC-5) were cultured in direct contact with FSP-M, demonstrating its cytocompatibility for 48 h. Based on these results, FSP can be considered a potential biomaterial recovered from nature, for wound dressing applications.
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Affiliation(s)
- Sara Vieira
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Avepark 4805-017 Barco, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga, Guimarães, Portugal
| | - Albina R Franco
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Avepark 4805-017 Barco, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga, Guimarães, Portugal
| | - Emanuel M Fernandes
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Avepark 4805-017 Barco, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga, Guimarães, Portugal
| | - Sara Amorim
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Avepark 4805-017 Barco, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga, Guimarães, Portugal
| | - Helena Ferreira
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Avepark 4805-017 Barco, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga, Guimarães, Portugal
| | - Ricardo A Pires
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Avepark 4805-017 Barco, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga, Guimarães, Portugal
| | - Rui L Reis
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Avepark 4805-017 Barco, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga, Guimarães, Portugal; The Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, Avepark 4805-017 Barco, Guimarães, Portugal
| | - Albino Martins
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Avepark 4805-017 Barco, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga, Guimarães, Portugal
| | - Nuno M Neves
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, University of Minho, Avepark 4805-017 Barco, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga, Guimarães, Portugal; The Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, Avepark 4805-017 Barco, Guimarães, Portugal.
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13
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Djajamuliadi J, Ohgo K, Kumashiro KK. Targeting Alanines in the Hydrophobic and Cross-Linking Domains of Native Elastin with Isotopic Enrichment and Solid-State NMR Spectroscopy. Macromolecules 2018. [DOI: 10.1021/acs.macromol.7b02617] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jhonsen Djajamuliadi
- Department of Chemistry, University of Hawaii,
2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
| | - Kosuke Ohgo
- Department of Chemistry, University of Hawaii,
2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
| | - Kristin K. Kumashiro
- Department of Chemistry, University of Hawaii,
2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
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14
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Tasei Y, Nishimura A, Suzuki Y, Sato TK, Sugahara J, Asakura T. NMR Investigation about Heterogeneous Structure and Dynamics of Recombinant Spider Silk in the Dry and Hydrated States. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01862] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Yugo Tasei
- Department
of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Akio Nishimura
- Department
of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Yu Suzuki
- Tenure-Track
Program for Innovative Research, University of Fukui, 3-9-1 Bunkyo, Fukui-shi, Fukui 910-8507, Japan
| | - Takehiro K. Sato
- Spiber Inc., 234-1 Mizukami, Kakuganji, Tsuruoka, Yamagata 997-0052, Japan
| | - Junichi Sugahara
- Spiber Inc., 234-1 Mizukami, Kakuganji, Tsuruoka, Yamagata 997-0052, Japan
| | - Tetsuo Asakura
- Department
of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo 184-8588, Japan
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15
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Tsuchiya K, Masunaga H, Numata K. Tensile Reinforcement of Silk Films by the Addition of Telechelic-Type Polyalanine. Biomacromolecules 2017; 18:1002-1009. [DOI: 10.1021/acs.biomac.6b01891] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kousuke Tsuchiya
- Enzyme
Research Team, Biomass Engineering Research Division, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Hiroyasu Masunaga
- Japan Synchrotron
Radiation Research Institute, 1-1-1,
Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Keiji Numata
- Enzyme
Research Team, Biomass Engineering Research Division, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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16
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McLachlan GD, Gandjian B, Alhumaidan H. Folding recombinant spider-silk in H2 O: Effect of osmolytes on the solution conformation of a 15-repeat spider-silk mimetic. Protein Sci 2016; 25:1853-62. [PMID: 27488926 PMCID: PMC5029536 DOI: 10.1002/pro.2995] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 07/30/2016] [Accepted: 08/01/2016] [Indexed: 11/10/2022]
Abstract
The folding of a recombinant spider silk protein-polymer in the presence of the tri-methylamine osmolytes TMANO and Betaine in 80% H2 O is reported. Circular dichroism measurements (CD) reveal an increase in α-helical secondary structure with increasing osmolyte concentrations, as determined by an increase in ellipticity at 222 nm. Consistent with this observation, the signal for random coil sampling, observed at 205 nm, is greatly reduced with increasing trimethylamine. Fluorescence spectra of a single tyrosine positioned within the conserved 33-amino acid repeat primary sequence (of the spider-silk mimetic) complements the conformational changes observed by CD. Importantly, there is a correlation between the number of Alkyl-groups (CH3 -) on the amine of the osmolyte and enhanced helicity of the 15-repeat silk-mimetic for the osmolytes tested, ie TMANO, Betaine, Sarcosine and Glycine. These preliminary results are applicable to storing and processing recombinant silk sequences in H2 O, an important mile-stone for widespread use of recombinant silk polymers.
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Affiliation(s)
- Glendon D McLachlan
- Department of Chemistry and Biochemistry Queens College, CUNY, Flushing, NY, 11367.
| | - Babak Gandjian
- Department of Chemistry and Biochemistry Queens College, CUNY, Flushing, NY, 11367
| | - Hind Alhumaidan
- Department of Chemistry and Biochemistry Queens College, CUNY, Flushing, NY, 11367
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17
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Suzuki Y. Structures of silk fibroin before and after spinning and biomedical applications. Polym J 2016. [DOI: 10.1038/pj.2016.77] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Mercurio FA, Di Natale C, Pirone L, Scognamiglio PL, Marasco D, Pedone EM, Saviano M, Leone M. Peptide Fragments of Odin-Sam1: Conformational Analysis and Interaction Studies with EphA2-Sam. Chembiochem 2015; 16:1629-36. [DOI: 10.1002/cbic.201500197] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Indexed: 11/09/2022]
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19
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Dong Y, Dong P, Huang D, Mei L, Xia Y, Wang Z, Pan X, Li G, Wu C. Fabrication and characterization of silk fibroin-coated liposomes for ocular drug delivery. Eur J Pharm Biopharm 2015; 91:82-90. [DOI: 10.1016/j.ejpb.2015.01.018] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Revised: 01/20/2015] [Accepted: 01/22/2015] [Indexed: 10/24/2022]
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20
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Lhor M, Méthot M, Horchani H, Salesse C. Structure of the N-terminal segment of human retinol dehydrogenase 11 and its preferential lipid binding using model membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:878-85. [DOI: 10.1016/j.bbamem.2014.12.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2014] [Revised: 12/09/2014] [Accepted: 12/15/2014] [Indexed: 11/25/2022]
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21
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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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22
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Yang M, Shuai Y, Zhou G, Mandal N, Zhu L, Mao C. Tuning molecular weights of Bombyx mori (B. mori) silk sericin to modify its assembly structures and materials formation. ACS APPLIED MATERIALS & INTERFACES 2014; 6:13782-9. [PMID: 25050697 PMCID: PMC4149330 DOI: 10.1021/am503214g] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Bombyx mori (B. mori) silk sericin is a protein with features desirable as a biomaterial, such as increased hydrophilicity and biodegradation, as well as resistance to oxidation, bacteria, and ultraviolet light. In contrast to other widely studied B. mori silk proteins such as fibroin, sericin is still unexplored as a building block for fabricating biomaterial, and thus a facile technique of processing it into a material is needed. Here, electrospinning technology was used to fabricate it into biomaterials from two forms of B. mori silk sericin with different molecular weights, one is a low (12.0 kDa) molecular sericin (LS) form and another is a high (66.0 kDa) molecular weight sericin (HS) form. Circular dichroism (CD) spectra showed that LS in hexafluoroacetone (HFA) solvent adopted a predominantly random coil conformation, whereas HS tended to form a β-sheet structure along with a large content of random coils. In addition, LS and HS in HFA solvent were found to form cylinder-like smaller nanoparticles and larger irregular aggregates before electrospinning, respectively. As a result, biomaterials based on microparticles and nanofibers were successfully fabricated by electrospinning of LS and HS dissolved in HFA, respectively. The cell viability and differentiation assay indicated that nanofibers and microparticles improved cell adhesion, growth, and differentiation, proving that the scaffolds electrospun from sericin are biocompatible regardless of its molecular weight. The microparticles, not common in electrospinning of silk proteins reported previously, were found to promote the osteogenic differentiation of mesenchymal stem cells in comparison to the nanofibers. This study suggested that molecular weight of sericin mediates its secondary structure and assembly structure, which in turn leads to a control of final morphology of the electrospun materials. The microparticles and nanofibers of sericin can be potentially used as building blocks for fabricating the scaffolds for tissue engineering.
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Affiliation(s)
- Mingying Yang
- Institute of Applied
Bioresource Research, College of Animal Science, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058 Zhejiang, China
- E-mail: (M.Y.)
| | - Yajun Shuai
- Institute of Applied
Bioresource Research, College of Animal Science, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058 Zhejiang, China
| | - Guanshan Zhou
- Institute of Applied
Bioresource Research, College of Animal Science, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058 Zhejiang, China
| | - Namita Mandal
- Institute of Applied
Bioresource Research, College of Animal Science, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058 Zhejiang, China
| | - Liangjun Zhu
- Institute of Applied
Bioresource Research, College of Animal Science, Zhejiang University, Yuhangtang Road 866, Hangzhou, 310058 Zhejiang, China
| | - Chuanbin Mao
- Department of Chemistry & Biochemistry, Stephenson Life Sciences
Research Center, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019-5300, United States
- E-mail: (C.M.)
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23
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Lhor M, Bernier SC, Horchani H, Bussières S, Cantin L, Desbat B, Salesse C. Comparison between the behavior of different hydrophobic peptides allowing membrane anchoring of proteins. Adv Colloid Interface Sci 2014; 207:223-39. [PMID: 24560216 PMCID: PMC4028306 DOI: 10.1016/j.cis.2014.01.015] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Revised: 01/11/2014] [Accepted: 01/13/2014] [Indexed: 10/25/2022]
Abstract
Membrane binding of proteins such as short chain dehydrogenase reductases or tail-anchored proteins relies on their N- and/or C-terminal hydrophobic transmembrane segment. In this review, we propose guidelines to characterize such hydrophobic peptide segments using spectroscopic and biophysical measurements. The secondary structure content of the C-terminal peptides of retinol dehydrogenase 8, RGS9-1 anchor protein, lecithin retinol acyl transferase, and of the N-terminal peptide of retinol dehydrogenase 11 has been deduced by prediction tools from their primary sequence as well as by using infrared or circular dichroism analyses. Depending on the solvent and the solubilization method, significant structural differences were observed, often involving α-helices. The helical structure of these peptides was found to be consistent with their presumed membrane binding. Langmuir monolayers have been used as membrane models to study lipid-peptide interactions. The values of maximum insertion pressure obtained for all peptides using a monolayer of 1,2-dioleoyl-sn-glycero-3-phospho-ethanolamine (DOPE) are larger than the estimated lateral pressure of membranes, thus suggesting that they bind membranes. Polarization modulation infrared reflection absorption spectroscopy has been used to determine the structure and orientation of these peptides in the absence and in the presence of a DOPE monolayer. This lipid induced an increase or a decrease in the organization of the peptide secondary structure. Further measurements are necessary using other lipids to better understand the membrane interactions of these peptides.
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Affiliation(s)
- Mustapha Lhor
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Sarah C Bernier
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Habib Horchani
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Sylvain Bussières
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Line Cantin
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Bernard Desbat
- CBMN-UMR 5248 CNRS, Université de Bordeaux, IPB, Allée Geoffroy Saint Hilaire, 33600 Pessac, France
| | - Christian Salesse
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada.
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24
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Toft DJ, Moyer TJ, Standley SM, Ruff Y, Ugolkov A, Stupp SI, Cryns VL. Coassembled cytotoxic and pegylated peptide amphiphiles form filamentous nanostructures with potent antitumor activity in models of breast cancer. ACS NANO 2012; 6:7956-65. [PMID: 22928955 PMCID: PMC3458188 DOI: 10.1021/nn302503s] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Self-assembled peptide amphiphiles (PAs) consisting of hydrophobic, hydvrogen-bonding, and charged hydrophilic domains form cylindrical nanofibers in physiological conditions and allow for the presentation of a high density of bioactive epitopes on the nanofiber surface. We report here on the use of PAs to form multifunctional nanostructures with tumoricidal activity. The combination of a cationic, membrane-lytic PA coassembled with a serum-protective, pegylated PA was shown to self-assemble into nanofibers. Addition of the pegylated PA to the nanostructure substantially limited degradation of the cytolytic PA by the protease trypsin, with an 8-fold increase in the amount of intact PA observed after digestion. At the same time, addition of up to 50% pegylated PA to the nanofibers did not decrease the in vitro cytotoxicity of the cytolytic PA. Using a fluorescent tag covalently attached to PA nanofibers we were able to track the biodistribution in plasma and tissues of tumor-bearing mice over time after intraperitoneal administration of the nanoscale filaments. Using an orthotopic mouse xenograft model of breast cancer, systemic administration of the cytotoxic pegylated nanostructures significantly reduced tumor cell proliferation and overall tumor growth, demonstrating the potential of multifunctional PA nanostructures as versatile cancer therapeutics.
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Affiliation(s)
- Daniel J Toft
- Institute for BioNanotechnology in Medicine, Northwestern University, Chicago, Illinois 60611, United States
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25
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Soukasene S, Toft DJ, Moyer TJ, Lu H, Lee HK, Standley SM, Cryns VL, Stupp SI. Antitumor activity of peptide amphiphile nanofiber-encapsulated camptothecin. ACS NANO 2011; 5:9113-21. [PMID: 22044255 PMCID: PMC3229267 DOI: 10.1021/nn203343z] [Citation(s) in RCA: 146] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Self-assembling peptide amphiphile (PA) nanofibers were used to encapsulate camptothecin (CPT), a naturally occurring hydrophobic chemotherapy agent, using a solvent evaporation technique. Encapsulation by PA nanofibers was found to improve the aqueous solubility of the CPT molecule by more than 50-fold. PAs self-assembled into nanofibers in the presence of CPT as demonstrated by transmission electron microscopy. Small-angle X-ray scattering results suggest a slight increase in diameter of the nanofiber to accommodate the hydrophobic cargo. In vitro studies using human breast cancer cells show an enhancement in antitumor activity of the CPT when encapsulated by the PA nanofibers. In addition, using a mouse orthotopic model of human breast cancer, treatment with PA nanofiber-encapsulated CPT inhibited tumor growth. These results highlight the potential of this model PA system to be adapted for delivery of hydrophobic therapies to treat a variety of diseases including cancer.
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Affiliation(s)
- Stephen Soukasene
- Institute for BioNanotechnology in Medicine, Northwestern University, Chicago, Illinois, 60611
- Department of Materials Science & Engineering, Northwestern University, Evanston, Illinois, 60208
| | - Daniel J. Toft
- Institute for BioNanotechnology in Medicine, Northwestern University, Chicago, Illinois, 60611
- Department of Medicine, Robert H. Lurie Comprehensive Cancer Center, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, 60611
| | - Tyson J. Moyer
- Department of Materials Science & Engineering, Northwestern University, Evanston, Illinois, 60208
| | - Hsuming Lu
- Department of Materials Science & Engineering, Northwestern University, Evanston, Illinois, 60208
| | - Hyung-Kun Lee
- Department of Materials Science & Engineering, Northwestern University, Evanston, Illinois, 60208
| | - Stephany M. Standley
- Department of Materials Science & Engineering, Northwestern University, Evanston, Illinois, 60208
| | - Vincent L. Cryns
- Institute for BioNanotechnology in Medicine, Northwestern University, Chicago, Illinois, 60611
- Department of Medicine, Robert H. Lurie Comprehensive Cancer Center, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, 60611
| | - Samuel I. Stupp
- Institute for BioNanotechnology in Medicine, Northwestern University, Chicago, Illinois, 60611
- Department of Materials Science & Engineering, Northwestern University, Evanston, Illinois, 60208
- Department of Medicine, Robert H. Lurie Comprehensive Cancer Center, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, 60611
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26
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Mathur AB, Gupta V. Silk fibroin-derived nanoparticles for biomedical applications. Nanomedicine (Lond) 2010; 5:807-20. [DOI: 10.2217/nnm.10.51] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
The treatment of disease in the future will be influenced by the ability to produce therapeutic formulations that have high availability at the disease site, sustained and long-term release, with minimal to no toxicity to healthy tissues. Biologically derived delivery systems offer promise in this regard owing to minimization of adverse effects while increasing the efficacy of the entrapped therapeutic. Silk fibroin nanoparticles overcome barriers set by synthetic nondegradable nanoparticles made of silicone, polyethylene glycol and degradable polylactic acid–polyglycolic acid polymers. Silk fibroin-mediated delivery has demonstrated high efficacy in breast cancer cells. While the targeting is associated with the specificity of entrapped therapeutic for the diseased cells, silk fibroin-derived particles enhance intracellular uptake and retention resulting in downmodulation of more than one pathway due to longer availability of the therapeutic. The mechanism of targeting for the nanoparticle is based on the silk fibroin composition, β-sheet structure and self-assembly into β-barrels.
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Affiliation(s)
| | - Vishal Gupta
- Tissue Regeneration & Molecular Cell Engineering Labs (TRAMCEL), Department of Plastic Surgery, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd., Unit 602, Houston, TX 77030, USA
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27
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Zhu Z, Kikuchi Y, Kojima K, Tamura T, Kuwabara N, Nakamura T, Asakura T. Mechanical properties of regenerated Bombyx mori silk fibers and recombinant silk fibers produced by transgenic silkworms. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2010; 21:395-411. [PMID: 20178693 DOI: 10.1163/156856209x423126] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Regenerated silk fibroin fibers from the cocoons of silkworm, Bombyx mori, were prepared with hexafluoro solvents, 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) or hexafluoroacetone-trihydrate (HFA), as dope solvents and methanol as coagulation solvent. The regenerated fiber prepared from the HFIP solution showed slightly larger tensile strength when the draw ratio is 1:3 than that of native silk fiber, but the strength of the regenerated fiber with draw ratio 1:3 from the HFA solution is much lower than that of native silk fiber. This difference in the tensile strength of the regenerated silk fibers between two dope solvents comes from the difference in the long-range orientation of the crystalline region rather than that of short-range structural environment such as the fraction of beta-sheet structure. The increase in the biodegradation was observed for the regenerated silk fiber compared with native silk fiber. Preparations of regenerated silk fibroin fibers containing spider silk sequences were obtained by mixing silk fibroins and silk-like proteins with characteristic sequences from a spider, Naphila clavipes, to produce drag-line silk in E. coli in the fluoro solvents. A small increase in the tensile strength was obtained by adding 5% (w/w) of the silk-like protein to the silk fibroin. The production of silk fibroin fibers with these spider silk sequences was also performed with transgenic silkworms. Small increase in the tensile strength of the fibers was obtained without significant change in the elongation-at-break.
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Affiliation(s)
- Zhenghua Zhu
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
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28
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Neuman RC, Gerig JT. Interaction of Alcohols with [Val5]angiotensin in Alcohol−Water Mixtures. J Phys Chem B 2010; 114:6722-31. [DOI: 10.1021/jp101305u] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- R. C. Neuman
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, California 93106
| | - J. T. Gerig
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, California 93106
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29
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Suzuki Y, Gerig JT, Asakura T. NMR Study of Interactions between Silk Model Peptide and Fluorinated Alcohols for Preparation of Regenerated Silk Fiber. Macromolecules 2010. [DOI: 10.1021/ma902544c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yu Suzuki
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo 184-8588, Japan
| | - J. T. Gerig
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106
| | - Tetsuo Asakura
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo 184-8588, Japan
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30
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McLachlan GD, Slocik J, Mantz R, Kaplan D, Cahill S, Girvin M, Greenbaum S. High-resolution NMR characterization of a spider-silk mimetic composed of 15 tandem repeats and a CRGD motif. Protein Sci 2009; 18:206-16. [PMID: 19177364 DOI: 10.1002/pro.12] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Multidimensional solution NMR spectroscopic techniques have been used to obtain atomic level information about a recombinant spider silk construct in hexafluoro-isopropanol (HFIP). The synthetic 49 kDa silk-like protein mimics authentic silk from Nephila clavipes, with the inclusion of an extracellular matrix recognition motif. 2D (1)H-(15)N HSQC NMR spectroscopy reveals 33 cross peaks, which were assigned to amino acid residues in the semicrystalline repeat units. Signals from the amorphous segments in the primary sequence were weak and broad, suggesting that this region is highly dynamic and undergoing conformational exchange. An analysis of the deviations of the (13)C(alpha), (13)C(beta), and (13)CO chemical shifts relative to the expected random coil values reveals two highly alpha-helical regions from amino acid 12-19 and 26-32, which comprise the polyalanine track and a GGLGSQ sequence. This finding is further supported by phi-value analysis and sequential and medium-range NOE interactions. Pulsed field gradient NMR measurements indicate that the topology of the silk mimetic in HFIP is nonglobular. Moreover, the 3D (15)N-NOESY HSQC spectrum exhibits few long-range NOEs. Similar spectral features have been observed for repeat modules in other polypeptides and are characteristic of an elongated conformation. The results provide a residue-specific description of a silk sequence in nonaqueous solution and may be insightful for understanding the fold and topology of highly concentrated, stable silk before spinning. Additionally, the insights obtained may find application in future design and large-scale production and storage of synthetic silks in organic solvents.
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Affiliation(s)
- Glendon D McLachlan
- Department of Physics and Astronomy Hunter College, City University of New York, New York, NY 10065, USA.
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31
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Fu C, Shao Z, Fritz V. Animal silks: their structures, properties and artificial production. Chem Commun (Camb) 2009:6515-29. [DOI: 10.1039/b911049f] [Citation(s) in RCA: 191] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Yang M, Kawamura J, Zhu Z, Yamauchi K, Asakura T. Development of silk-like materials based on Bombyx mori and Nephila clavipes dragline silk fibroins. POLYMER 2009. [DOI: 10.1016/j.polymer.2008.10.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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33
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Moretto A, Formaggio F, Kaptein B, Broxterman QB, Wu L, Keiderling TA, Toniolo C. First homo-peptides undergoing a reversible 310-helix/α-helix transition: Critical main-chain length. Biopolymers 2008; 90:567-74. [DOI: 10.1002/bip.21016] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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34
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Crisma M, Saviano M, Moretto A, Broxterman QB, Kaptein B, Toniolo C. Peptide alpha/3(10)-helix dimorphism in the crystal state. J Am Chem Soc 2007; 129:15471-3. [PMID: 18027948 DOI: 10.1021/ja076656a] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marco Crisma
- Institute of Biomolecular Chemistry, Padova Unit, CNR, Department of Chemistry, University of Padova, 35131 Padova, Italy.
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35
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Cheema SK, Gobin AS, Rhea R, Lopez-Berestein G, Newman RA, Mathur AB. Silk fibroin mediated delivery of liposomal emodin to breast cancer cells. Int J Pharm 2007; 341:221-9. [PMID: 17499461 DOI: 10.1016/j.ijpharm.2007.03.043] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2006] [Revised: 02/23/2007] [Accepted: 03/26/2007] [Indexed: 11/22/2022]
Abstract
The efficacy of a drug is dependent on its mode of delivery and its potency at the tumor site. In this study, the drug delivery and efficacy of silk fibroin coated liposomes (SF-ELP), encapsulating a receptor tyrosine kinase inhibitor, emodin, on Her2/neu over-expressing breast cancer cells, was investigated. This study demonstrates that SF-ELP was more efficacious in suppressing the growth of Her2/neu over-expressing breast cancer cells MDA-MB-453 and BT-474 as compared to uncoated emodin loaded liposomes (ELP). Reduced levels of phosphorylated Her2/neu correlated with growth inhibition observed in the MDA-MB-453 cells, treated with both ELP and SF-ELP. ELP treatment of MDA-MB-453 breast cancer cells resulted in inhibition of the PI3K pathway whereas SF-ELP treatment inhibited both the PI3K and MAPK pathways, which contributed to the enhanced growth inhibitory effects of Her2/neu over-expressing breast cancer cells. Coating of ELP with silk fibroin did not alter the target specificity of emodin, on the other hand the emodin efficacy was enhanced. Higher uptake of emodin delivered by SF-ELP lead to increased cell death as compared to emodin delivery via ELP. Silk fibroin coating around the liposome imparts an extra layer that emodin has to extravasate in order to release from the encapsulating liposome. This increases retention of the drug in the cell for a longer time and protects emodin from quick release and metabolism. Longer intracellular retention may lead to the longer availability of emodin for down-modulation of various Her2/neu pathways. This study demonstrates that silk fibroin coating enhanced emodin delivery in Her2/neu over-expressing breast cancer cells thereby increasing the overall efficacy of the drug.
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Affiliation(s)
- Sangeeta K Cheema
- University of Texas M.D. Anderson Cancer Center, Departments of Biomedical Engineering and Plastic Surgery, Unit 602, P.O. Box 301402, Houston, TX 72230-1402, United States
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