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Younes HM, Kadavil H, Ismail HM, Adib SA, Zamani S, Alany RG, Al-Kinani AA. Overview of Tissue Engineering and Drug Delivery Applications of Reactive Electrospinning and Crosslinking Techniques of Polymeric Nanofibers with Highlights on Their Biocompatibility Testing and Regulatory Aspects. Pharmaceutics 2023; 16:32. [PMID: 38258043 PMCID: PMC10818558 DOI: 10.3390/pharmaceutics16010032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 12/12/2023] [Accepted: 12/14/2023] [Indexed: 01/24/2024] Open
Abstract
Traditional electrospinning is a promising technique for fabricating nanofibers for tissue engineering and drug delivery applications. The method is highly efficient in producing nanofibers with morphology and porosity similar to the extracellular matrix. Nonetheless, and in many instances, the process has faced several limitations, including weak mechanical strength, large diameter distributions, and scaling-up difficulties of its fabricated electrospun nanofibers. The constraints of the polymer solution's intrinsic properties are primarily responsible for these limitations. Reactive electrospinning constitutes a novel and modified electrospinning techniques developed to overcome those challenges and improve the properties of the fabricated fibers intended for various biomedical applications. This review mainly addresses reactive electrospinning techniques, a relatively new approach for making in situ or post-crosslinked nanofibers. It provides an overview of and discusses the recent literature about chemical and photoreactive electrospinning, their various techniques, their biomedical applications, and FDA regulatory aspects related to their approval and marketing. Another aspect highlighted in this review is the use of crosslinking and reactive electrospinning techniques to enhance the fabricated nanofibers' physicochemical and mechanical properties and make them more biocompatible and tailored for advanced intelligent drug delivery and tissue engineering applications.
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Affiliation(s)
- Husam M. Younes
- Tissue Engineering & Nanopharmaceuticals Research Laboratory (TENRL), Office of Vice President for Research & Graduate Studies, Qatar University, Doha P.O. Box 2713, Qatar; (H.K.); (H.M.I.); (S.A.A.)
| | - Hana Kadavil
- Tissue Engineering & Nanopharmaceuticals Research Laboratory (TENRL), Office of Vice President for Research & Graduate Studies, Qatar University, Doha P.O. Box 2713, Qatar; (H.K.); (H.M.I.); (S.A.A.)
| | - Hesham M. Ismail
- Tissue Engineering & Nanopharmaceuticals Research Laboratory (TENRL), Office of Vice President for Research & Graduate Studies, Qatar University, Doha P.O. Box 2713, Qatar; (H.K.); (H.M.I.); (S.A.A.)
- Charles River Laboratories, Montreal, QC H9X 3R3, Canada
| | - Sandi Ali Adib
- Tissue Engineering & Nanopharmaceuticals Research Laboratory (TENRL), Office of Vice President for Research & Graduate Studies, Qatar University, Doha P.O. Box 2713, Qatar; (H.K.); (H.M.I.); (S.A.A.)
| | - Somayeh Zamani
- Tissue Engineering & Nanopharmaceuticals Research Laboratory (TENRL), Office of Vice President for Research & Graduate Studies, Qatar University, Doha P.O. Box 2713, Qatar; (H.K.); (H.M.I.); (S.A.A.)
- Materials Science & Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Raid G. Alany
- School of Pharmacy, The University of Auckland, Auckland 1142, New Zealand; (R.G.A.); (A.A.A.-K.)
- Drug Discovery, Delivery and Patient Care (DDDPC) Theme, School of Life Sciences, Pharmacy and Chemistry, Kingston University London, Kingston upon Thames, London KT2 7LB, UK
| | - Ali A. Al-Kinani
- School of Pharmacy, The University of Auckland, Auckland 1142, New Zealand; (R.G.A.); (A.A.A.-K.)
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2
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Xie Q, On Lee S, Vissamsetti N, Guo S, Johnson ME, Fried SD. Secretion-Catalyzed Assembly of Protein Biomaterials on a Bacterial Membrane Surface. Angew Chem Int Ed Engl 2023; 62:e202305178. [PMID: 37469298 DOI: 10.1002/anie.202305178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 06/28/2023] [Accepted: 07/18/2023] [Indexed: 07/21/2023]
Abstract
Protein-based biomaterials have played a key role in tissue engineering, and additional exciting applications as self-healing materials and sustainable polymers are emerging. Over the past few decades, recombinant expression and production of various fibrous proteins from microbes have been demonstrated; however, the resulting proteins typically must then be purified and processed by humans to form usable fibers and materials. Here, we show that the Gram-positive bacterium Bacillus subtilis can be programmed to secrete silk through its translocon via an orthogonal signal peptide/peptidase pair. Surprisingly, we discover that this translocation mechanism drives the silk proteins to assemble into fibers spontaneously on the cell surface, in a process we call secretion-catalyzed assembly (SCA). Secreted silk fibers form self-healing hydrogels with minimal processing. Alternatively, the fibers retained on the membrane provide a facile route to create engineered living materials from Bacillus cells. This work provides a blueprint to achieve autonomous assembly of protein biomaterials in useful morphologies directly from microbial factories.
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Affiliation(s)
- Qi Xie
- Department of Chemistry, Johns Hopkins University, 21218, Baltimore, MD, USA
| | - Sea On Lee
- Department of Chemistry, Johns Hopkins University, 21218, Baltimore, MD, USA
| | - Nitya Vissamsetti
- Department of Chemistry, Johns Hopkins University, 21218, Baltimore, MD, USA
| | - Sikao Guo
- T. C. Jenkins Department of Biophysics, Johns Hopkins University, 21218, Baltimore, MD, USA
| | - Margaret E Johnson
- T. C. Jenkins Department of Biophysics, Johns Hopkins University, 21218, Baltimore, MD, USA
| | - Stephen D Fried
- Department of Chemistry, Johns Hopkins University, 21218, Baltimore, MD, USA
- T. C. Jenkins Department of Biophysics, Johns Hopkins University, 21218, Baltimore, MD, USA
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3
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Xu X, Lv H, Zhang M, Wang M, Zhou Y, Liu Y, Yu DG. Recent progress in electrospun nanofibers and their applications in heavy metal wastewater treatment. Front Chem Sci Eng 2023. [DOI: 10.1007/s11705-022-2245-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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4
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Lee JW, Song KH. Fibrous hydrogels by electrospinning: Novel platforms for biomedical applications. J Tissue Eng 2023; 14:20417314231191881. [PMID: 37581121 PMCID: PMC10423451 DOI: 10.1177/20417314231191881] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Accepted: 07/19/2023] [Indexed: 08/16/2023] Open
Abstract
Hydrogels, hydrophilic and biocompatible polymeric networks, have been used for numerous biomedical applications because they have exhibited abilities to mimic features of extracellular matrix (ECM). In particular, the hydrogels engineered with electrospinning techniques have shown great performances in biomedical applications. Electrospinning techniques are to generate polymeric micro/nanofibers that can mimic geometries of natural ECM by drawing micro/nanofibers from polymer precursors with electrical forces, followed by structural stabilization of them. By exploiting the electrospinning techniques, the fibrous hydrogels have been fabricated and utilized as 2D/3D cell culture platforms, implantable scaffolds, and wound dressings. In addition, some hydrogels that respond to external stimuli have been used to develop biosensors. For comprehensive understanding, this review covers electrospinning processes, hydrogel precursors used for electrospinning, characteristics of fibrous hydrogels and specific biomedical applications of electrospun fibrous hydrogels and highlight their potential to promote use in biomedical applications.
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Affiliation(s)
- Ji Woo Lee
- Department of Nano-Bioengineering, Incheon National University, Incheon, Republic of Korea
| | - Kwang Hoon Song
- Department of Nano-Bioengineering, Incheon National University, Incheon, Republic of Korea
- Research Center of Brain-Machine Interface, Incheon National University, Incheon, Republic of Korea
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5
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Griswold E, Cappello J, Ghandehari H. Silk-elastinlike protein-based hydrogels for drug delivery and embolization. Adv Drug Deliv Rev 2022; 191:114579. [PMID: 36306893 DOI: 10.1016/j.addr.2022.114579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 10/06/2022] [Accepted: 10/10/2022] [Indexed: 01/24/2023]
Abstract
Silk-Elastinlike Protein-Based Polymers (SELPs) can form thermoresponsive hydrogels that allow for the generation of in-situ drug delivery matrices. They are produced by recombinant techniques, enabling exact control of monomer sequence and polymer length. In aqueous solutions SELP strands form physical crosslinks as a function of temperature increase without the addition of crosslinking agents. Gelation kinetics, modulus of elasticity, pore size, drug release, biorecognition, and biodegradation of SELP hydrogels can be controlled by placement of amino acid residues at strategic locations in the polymer backbone. SELP hydrogels have been investigated for delivery of a variety of bioactive agents including small molecular weight drugs and fluorescent probes, oligomers of glycosaminoglycans, polymeric macromolecules, proteins, plasmid DNA, and viral gene delivery systems. In this review we provide a background for use of SELPs in matrix-mediated delivery and summarize recent investigations of SELP hydrogels for controlled delivery of bioactive agents as well as their use as liquid embolics.
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Affiliation(s)
- Ethan Griswold
- Department of Biomedical Engineering, University of Utah, Salt Lake City, UT 84112, USA; Utah Center of Nanomedicine, University of Utah, Salt Lake City, UT 84112, USA
| | - Joseph Cappello
- Department of Molecular Pharmaceutics, University of Utah, Salt Lake City, UT 84112, USA
| | - Hamidreza Ghandehari
- Department of Biomedical Engineering, University of Utah, Salt Lake City, UT 84112, USA; Utah Center of Nanomedicine, University of Utah, Salt Lake City, UT 84112, USA; Department of Molecular Pharmaceutics, University of Utah, Salt Lake City, UT 84112, USA.
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6
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Rodriguez-Cabello JC, Gonzalez De Torre I, González-Pérez M, González-Pérez F, Montequi I. Fibrous Scaffolds From Elastin-Based Materials. Front Bioeng Biotechnol 2021; 9:652384. [PMID: 34336798 PMCID: PMC8323661 DOI: 10.3389/fbioe.2021.652384] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 06/25/2021] [Indexed: 11/28/2022] Open
Abstract
Current cutting-edge strategies in biomaterials science are focused on mimicking the design of natural systems which, over millions of years, have evolved to exhibit extraordinary properties. Based on this premise, one of the most challenging tasks is to imitate the natural extracellular matrix (ECM), due to its ubiquitous character and its crucial role in tissue integrity. The anisotropic fibrillar architecture of the ECM has been reported to have a significant influence on cell behaviour and function. A new paradigm that pivots around the idea of incorporating biomechanical and biomolecular cues into the design of biomaterials and systems for biomedical applications has emerged in recent years. Indeed, current trends in materials science address the development of innovative biomaterials that include the dynamics, biochemistry and structural features of the native ECM. In this context, one of the most actively studied biomaterials for tissue engineering and regenerative medicine applications are nanofiber-based scaffolds. Herein we provide a broad overview of the current status, challenges, manufacturing methods and applications of nanofibers based on elastin-based materials. Starting from an introduction to elastin as an inspiring fibrous protein, as well as to the natural and synthetic elastin-based biomaterials employed to meet the challenge of developing ECM-mimicking nanofibrous-based scaffolds, this review will follow with a description of the leading strategies currently employed in nanofibrous systems production, which in the case of elastin-based materials are mainly focused on supramolecular self-assembly mechanisms and the use of advanced manufacturing technologies. Thus, we will explore the tendency of elastin-based materials to form intrinsic fibers, and the self-assembly mechanisms involved. We will describe the function and self-assembly mechanisms of silk-like motifs, antimicrobial peptides and leucine zippers when incorporated into the backbone of the elastin-based biomaterial. Advanced polymer-processing technologies, such as electrospinning and additive manufacturing, as well as their specific features, will be presented and reviewed for the specific case of elastin-based nanofiber manufacture. Finally, we will present our perspectives and outlook on the current challenges facing the development of nanofibrous ECM-mimicking scaffolds based on elastin and elastin-like biomaterials, as well as future trends in nanofabrication and applications.
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Affiliation(s)
- Jose Carlos Rodriguez-Cabello
- BIOFORGE, University of Valladolid, Valladolid, Spain
- Center for Biomedical Research in the Network in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - Israel Gonzalez De Torre
- BIOFORGE, University of Valladolid, Valladolid, Spain
- Center for Biomedical Research in the Network in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - Miguel González-Pérez
- BIOFORGE, University of Valladolid, Valladolid, Spain
- Center for Biomedical Research in the Network in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - Fernando González-Pérez
- BIOFORGE, University of Valladolid, Valladolid, Spain
- Center for Biomedical Research in the Network in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - Irene Montequi
- BIOFORGE, University of Valladolid, Valladolid, Spain
- Center for Biomedical Research in the Network in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
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López Barreiro D, Minten IJ, Thies JC, Sagt CMJ. Structure-Property Relationships of Elastin-like Polypeptides: A Review of Experimental and Computational Studies. ACS Biomater Sci Eng 2021. [PMID: 34251181 DOI: 10.1021/acsbiomaterials.1c00145] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Elastin is a structural protein with outstanding mechanical properties (e.g., elasticity and resilience) and biologically relevant functions (e.g., triggering responses like cell adhesion or chemotaxis). It is formed from its precursor tropoelastin, a 60-72 kDa water-soluble and temperature-responsive protein that coacervates at physiological temperature, undergoing a phenomenon termed lower critical solution temperature (LCST). Inspired by this behavior, many scientists and engineers are developing recombinantly produced elastin-inspired biopolymers, usually termed elastin-like polypeptides (ELPs). These ELPs are generally comprised of repetitive motifs with the sequence VPGXG, which corresponds to repeats of a small part of the tropoelastin sequence, X being any amino acid except proline. ELPs display LCST and mechanical properties similar to tropoelastin, which renders them promising candidates for the development of elastic and stimuli-responsive protein-based materials. Unveiling the structure-property relationships of ELPs can aid in the development of these materials by establishing the connections between the ELP amino acid sequence and the macroscopic properties of the materials. Here we present a review of the structure-property relationships of ELPs and ELP-based materials, with a focus on LCST and mechanical properties and how experimental and computational studies have aided in their understanding.
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Affiliation(s)
- Diego López Barreiro
- DSM Biotechnology Center, DSM, Alexander Fleminglaan 1, 2613 AX Delft, The Netherlands
| | - Inge J Minten
- DSM Materials Science Center - Applied Science Center, DSM, Urmonderbaan 22, 6160 BB, Geleen, The Netherlands
| | - Jens C Thies
- DSM Biomedical, DSM, Koestraat 1, 6167 RA, Geleen, The Netherlands
| | - Cees M J Sagt
- DSM Biotechnology Center, DSM, Alexander Fleminglaan 1, 2613 AX Delft, The Netherlands
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8
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Delfi M, Sartorius R, Ashrafizadeh M, Sharifi E, Zhang Y, De Berardinis P, Zarrabi A, Varma RS, Tay FR, Smith BR, Makvandi P. Self-assembled peptide and protein nanostructures for anti-cancer therapy: Targeted delivery, stimuli-responsive devices and immunotherapy. NANO TODAY 2021; 38:101119. [PMID: 34267794 PMCID: PMC8276870 DOI: 10.1016/j.nantod.2021.101119] [Citation(s) in RCA: 113] [Impact Index Per Article: 37.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Self-assembled peptides and proteins possess tremendous potential as targeted drug delivery systems and key applications of these well-defined nanostructures reside in anti-cancer therapy. Peptides and proteins can self-assemble into nanostructures of diverse sizes and shapes in response to changing environmental conditions such as pH, temperature, ionic strength, as well as host and guest molecular interactions; their countless benefits include good biocompatibility and high loading capacity for hydrophobic and hydrophilic drugs. These self-assembled nanomaterials can be adorned with functional moieties to specifically target tumor cells. Stimuli-responsive features can also be incorporated with respect to the tumor microenvironment. This review sheds light on the growing interest in self-assembled peptides and proteins and their burgeoning applications in cancer treatment and immunotherapy.
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Affiliation(s)
- Masoud Delfi
- Department of Chemical Sciences, University of Naples “Federico II”, Complesso Universitario Monte S. Angelo, Via Cintia, Naples 80126, Italy
| | - Rossella Sartorius
- Institute of Biochemistry and Cell Biology (IBBC), National Research Council (CNR), Naples 80131, Italy
| | - Milad Ashrafizadeh
- Faculty of Engineering and Natural Sciences, Sabanci University, Orta Mahalle, Üniversite Caddesi No. 27, Orhanlı, Tuzla, 34956 Istanbul, Turkey
- Sabanci University Nanotechnology Research and Application Center (SUNUM), Tuzla, 34956, Istanbul, Turkey
| | - Esmaeel Sharifi
- Department of Tissue Engineering and Biomaterials, School of Advanced Medical Sciences and Technologies, Hamadan University of Medical Sciences, 6517838736, Hamadan, Iran
- Institute for Polymers, Composites and Biomaterials, National Research Council, IPCB-CNR, Naples 80125, Italy
| | - Yapei Zhang
- Department of Biomedical Engineering, Institute for Quantitative Health Science & Engineering, Michigan State University, East Lansing, MI 48824, USA
| | | | - Ali Zarrabi
- Sabanci University Nanotechnology Research and Application Center (SUNUM), Tuzla, 34956, Istanbul, Turkey
| | - Rajender S. Varma
- Regional Centre of Advanced Technologies and Materials, Palacký University Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
| | - Franklin R Tay
- The Graduate School, Augusta University, Augusta, GA 30912, USA
| | - Bryan Ronain Smith
- Department of Biomedical Engineering, Institute for Quantitative Health Science & Engineering, Michigan State University, East Lansing, MI 48824, USA
- Department of Radiology and the Molecular Imaging Program, Stanford University, Stanford, CA, 94305, USA
| | - Pooyan Makvandi
- Istituto Italiano di Tecnologia, Centre for Micro-BioRobotics, Viale Rinaldo Piaggio 34, 56025 Pontedera, Pisa, Italy
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9
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González-Obeso C, González-Pérez M, Mano JF, Alonso M, Rodríguez-Cabello JC. Complex Morphogenesis by a Model Intrinsically Disordered Protein. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2005191. [PMID: 33216415 DOI: 10.1002/smll.202005191] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 10/14/2020] [Indexed: 05/13/2023]
Abstract
The development of intricate and complex self-assembling structures in the micrometer range, such as biomorphs, is a major challenge in materials science. Although complex structures can be obtained from self-assembling materials as they segregate from solution, their size is usually in the nanometer range or requires accessory techniques. Previous studies with intrinsically disordered proteins (IDPs) have shown that the active interplay of different molecular interactions provides access to new and more complex nanostructures. As such, it is hypothesized that enriching the variety of intra- and intermolecular interactions in a model IDP will widen the landscape of sophisticated intermediate structures that can be accessed. In this study, a model silk-elastin-like recombinamer capable of interacting via three non-covalent interactions, namely hydrophobic, ion-pairing, and H-bonding is built. This model material is shown to self-assemble into complex stable micrometer-sized biomorphs. Variation of the block composition, pH, and temperature demonstrates the necessary interplay of all three interactions for the formation of such complex structures.
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Affiliation(s)
- Constancio González-Obeso
- BIOFORGE (Group for Advanced Materials and Nanobiotechnology), University of Valladolid-CIBER-BBN, Paseo de Belén 19, Valladolid, 47011, Spain
- Department of Biomedical Engineering, Tufts University, 4 Colby St., Medford, MA, 02155, USA
| | - Miguel González-Pérez
- BIOFORGE (Group for Advanced Materials and Nanobiotechnology), University of Valladolid-CIBER-BBN, Paseo de Belén 19, Valladolid, 47011, Spain
| | - João F Mano
- Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, Aveiro, 3810-193, Portugal
| | - Matilde Alonso
- BIOFORGE (Group for Advanced Materials and Nanobiotechnology), University of Valladolid-CIBER-BBN, Paseo de Belén 19, Valladolid, 47011, Spain
| | - José Carlos Rodríguez-Cabello
- BIOFORGE (Group for Advanced Materials and Nanobiotechnology), University of Valladolid-CIBER-BBN, Paseo de Belén 19, Valladolid, 47011, Spain
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10
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Katyal P, Meleties M, Montclare JK. Self-Assembled Protein- and Peptide-Based Nanomaterials. ACS Biomater Sci Eng 2019; 5:4132-4147. [PMID: 33417774 DOI: 10.1021/acsbiomaterials.9b00408] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Considerable effort has been devoted to generating novel protein- and peptide-based nanomaterials with their applications in a wide range of fields. Specifically, the unique property of proteins to self-assemble has been utilized to create a variety of nanoassemblies, which offer significant possibilities for next-generation biomaterials. In this minireview, we describe self-assembled protein- and peptide-based nanomaterials with focus on nanofibers and nanoparticles. Their applications in delivering therapeutic drugs and genes are discussed.
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Affiliation(s)
- Priya Katyal
- Department of Chemical and Biomolecular Engineering, Tandon School of Engineering, New York University, Brooklyn, New York 11201, United States
| | - Michael Meleties
- Department of Chemical and Biomolecular Engineering, Tandon School of Engineering, New York University, Brooklyn, New York 11201, United States
| | - Jin K Montclare
- Department of Chemical and Biomolecular Engineering, Tandon School of Engineering, New York University, Brooklyn, New York 11201, United States.,Department of Radiology, New York University Langone Health, New York, New York 10016, United States.,Department of Biomaterials, College of Dentistry, New York University, New York, New York 10010, United States.,Department of Chemistry, New York University, New York, New York 10003, United States
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11
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Willems L, Roberts S, Weitzhandler I, Chilkoti A, Mastrobattista E, van der Oost J, de Vries R. Inducible Fibril Formation of Silk-Elastin Diblocks. ACS OMEGA 2019; 4:9135-9143. [PMID: 31172045 PMCID: PMC6545545 DOI: 10.1021/acsomega.9b01025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Accepted: 05/10/2019] [Indexed: 06/09/2023]
Abstract
Silk-elastin block copolymers have such physical and biological properties that make them attractive biomaterials for applications ranging from tissue regeneration to drug delivery. Silk-elastin block copolymers that only assemble into fibrils at high concentrations can be used for a template-induced fibril assembly. This can be achieved by additionally including template-binding blocks that promote high local concentrations of polymers on the template, leading to a template-induced fibril assembly. We hypothesize that template-inducible silk-fibril formation, and hence high critical concentrations for fibril formation, requires careful tuning of the block lengths, to be close to a critical set of block lengths that separates fibril forming from nonfibril forming polymer architectures. Therefore, we explore herein the impact of tuning block lengths for silk-elastin diblock polypeptides on fibril formation. For silk-elastin diblocks ES m -SQ n , in which the elastin pentamer repeat is ES = GSGVP and the crystallizable silk octamer repeat is SQ = GAGAGAGQ, we find that no fibril formation occurs for n = 6 but that the n = 10 and 14 diblocks do show concentration-dependent fibril formation. For n = 14 diblocks, no effect is observed of the length m (with m = 40, 60, 80) of the amorphous block on the lengths of the fibrils. In contrast, for the n = 10 diblocks that are closest to the critical boundary for fibril formation, we find that long amorphous blocks (m = 80) oppose the growth of fibrils at low concentrations, making them suitable for engineering template-inducible fibril formation.
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Affiliation(s)
- Lione Willems
- Physical
Chemistry and Soft Matter and Laboratory of Microbiology, Wageningen University and Research, Stippeneng 4, 6708
WE Wageningen, The Netherlands
| | - Stefan Roberts
- Department
of Biomedical Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Isaac Weitzhandler
- Department
of Biomedical Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Ashutosh Chilkoti
- Department
of Biomedical Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Enrico Mastrobattista
- Department
of Pharmaceutics, Utrecht Institute of Pharmaceutical Sciences (UIPS),
Faculty of Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - John van der Oost
- Physical
Chemistry and Soft Matter and Laboratory of Microbiology, Wageningen University and Research, Stippeneng 4, 6708
WE Wageningen, The Netherlands
| | - Renko de Vries
- Physical
Chemistry and Soft Matter and Laboratory of Microbiology, Wageningen University and Research, Stippeneng 4, 6708
WE Wageningen, The Netherlands
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Yang B, Adams DJ, Marlow M, Zelzer M. Surface-Mediated Supramolecular Self-Assembly of Protein, Peptide, and Nucleoside Derivatives: From Surface Design to the Underlying Mechanism and Tailored Functions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:15109-15125. [PMID: 30032622 DOI: 10.1021/acs.langmuir.8b01165] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Among the many parameters that have been explored to exercise control over self-assembly processes, the influence of surface properties on self-assembly has been recognized as important but has received considerably less attention than other factors. This is particularly true for biomolecule-derived self-assembling molecules such as protein, peptide, and nucleobase derivatives. Because of their relevance to biomaterial and drug delivery applications, interest in these materials is increasing. As the formation of supramolecular structures from these biomolecule derivatives inevitably brings them into contact with the surfaces of surrounding materials, understanding and controlling the impact of the properties of these surfaces on the self-assembly process are important. In this feature article, we present an overview of the different surface parameters that have been used and studied for the direction of the self-assembly of protein, peptide, and nucleoside-based molecules. The current mechanistic understanding of these processes will be discussed, and potential applications of surface-mediated self-assembly will be outlined.
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Affiliation(s)
- Bin Yang
- Department of Pharmacy , University of Nottingham , Nottingham NG2 7RD , U.K
| | - Dave J Adams
- School of Chemistry , University of Glasgow , Glasgow G12 8QQ , U.K
| | - Maria Marlow
- Department of Pharmacy , University of Nottingham , Nottingham NG2 7RD , U.K
| | - Mischa Zelzer
- Department of Pharmacy , University of Nottingham , Nottingham NG2 7RD , U.K
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13
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DeFrates KG, Moore R, Borgesi J, Lin G, Mulderig T, Beachley V, Hu X. Protein-Based Fiber Materials in Medicine: A Review. NANOMATERIALS (BASEL, SWITZERLAND) 2018; 8:E457. [PMID: 29932123 PMCID: PMC6071022 DOI: 10.3390/nano8070457] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 06/11/2018] [Accepted: 06/20/2018] [Indexed: 12/30/2022]
Abstract
Fibrous materials have garnered much interest in the field of biomedical engineering due to their high surface-area-to-volume ratio, porosity, and tunability. Specifically, in the field of tissue engineering, fiber meshes have been used to create biomimetic nanostructures that allow for cell attachment, migration, and proliferation, to promote tissue regeneration and wound healing, as well as controllable drug delivery. In addition to the properties of conventional, synthetic polymer fibers, fibers made from natural polymers, such as proteins, can exhibit enhanced biocompatibility, bioactivity, and biodegradability. Of these proteins, keratin, collagen, silk, elastin, zein, and soy are some the most common used in fiber fabrication. The specific capabilities of these materials have been shown to vary based on their physical properties, as well as their fabrication method. To date, such fabrication methods include electrospinning, wet/dry jet spinning, dry spinning, centrifugal spinning, solution blowing, self-assembly, phase separation, and drawing. This review serves to provide a basic knowledge of these commonly utilized proteins and methods, as well as the fabricated fibers’ applications in biomedical research.
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Affiliation(s)
- Kelsey G DeFrates
- Department of Physics and Astronomy, Rowan University, Glassboro, NJ 08028, USA.
- Department of Biomedical Engineering, Rowan University, Glassboro, NJ 08028, USA.
| | - Robert Moore
- Department of Physics and Astronomy, Rowan University, Glassboro, NJ 08028, USA.
| | - Julia Borgesi
- Department of Biomedical Engineering, Rowan University, Glassboro, NJ 08028, USA.
| | - Guowei Lin
- Department of Physics and Astronomy, Rowan University, Glassboro, NJ 08028, USA.
| | - Thomas Mulderig
- Department of Mechanical Engineering, Rowan University, Glassboro, NJ 08028, USA.
| | - Vince Beachley
- Department of Biomedical Engineering, Rowan University, Glassboro, NJ 08028, USA.
| | - Xiao Hu
- Department of Physics and Astronomy, Rowan University, Glassboro, NJ 08028, USA.
- Department of Biomedical Engineering, Rowan University, Glassboro, NJ 08028, USA.
- Department of Molecular and Cellular Biosciences, Rowan University, Glassboro, NJ 08028, USA.
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14
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Yeo J, Huang W, Tarakanova A, Zhang YW, Kaplan DL, Buehler MJ. Unraveling the Molecular Mechanisms of Thermo-responsive Properties of Silk-Elastin-Like Proteins by Integrating Multiscale Modeling and Experiment. J Mater Chem B 2018; 6:3727-3734. [PMID: 30467524 PMCID: PMC6241539 DOI: 10.1039/c8tb00819a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Adaptive hydrogels tailor-made from silk-elastin-like proteins (SELPs) possess excellent biocompatibility and biodegradability with properties that are tunable and responsive to multiple simultaneous external stimuli. To unravel the molecular mechanisms of their physical response to external stimuli in tandem with experiments, here we predict and measure the variation in structural properties as a function of temperature through coarse-grained (CG) modeling of individual and crosslinked SE8Y and S4E8Y molecules, which have ratios of 1:8 and 4:8 of silk to elastin blocks respectively. Extensive structural reshuffling in single SE8Y molecules led to the increased compactness of the structure, whereas S4E8Y molecules did not experience any significant changes as they already adopted very compact structures at low temperatures. Crosslinking of SE8Y molecules at high concentrations impeded their structural transition at high temperatures that drastically reduced the degree of deswelling through extensive suppression of the structural shuffling and the trapping of the molecules in high potential energy states due to inter-molecular constraints. This integrative experimental and computational understanding of the thermal response in single molecules of SELPs and their crosslinked networks should lead to further improvements in the properties of SELP hydrogels through predictive designs and their wider applications in biomaterials and tissue engineering.
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Affiliation(s)
- Jingjie Yeo
- Laboratory for Atomistic and Molecular Mechanics (LAMM), Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Institute of High Performance Computing, ASTAR, 1 Fusionopolis Way, Singapore 138632, Singapore
| | - Wenwen Huang
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA
| | - Anna Tarakanova
- Laboratory for Atomistic and Molecular Mechanics (LAMM), Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Yong-Wei Zhang
- Institute of High Performance Computing, ASTAR, 1 Fusionopolis Way, Singapore 138632, Singapore
| | - David L Kaplan
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA
| | - Markus J Buehler
- Laboratory for Atomistic and Molecular Mechanics (LAMM), Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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15
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Yeo J, Jung GS, Martín-Martínez FJ, Ling S, Gu GX, Qin Z, Buehler MJ. Materials-by-Design: Computation, Synthesis, and Characterization from Atoms to Structures. PHYSICA SCRIPTA 2018; 93:053003. [PMID: 31866694 PMCID: PMC6924929 DOI: 10.1088/1402-4896/aab4e2] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
In the 50 years that succeeded Richard Feynman's exposition of the idea that there is "plenty of room at the bottom" for manipulating individual atoms for the synthesis and manufacturing processing of materials, the materials-by-design paradigm is being developed gradually through synergistic integration of experimental material synthesis and characterization with predictive computational modeling and optimization. This paper reviews how this paradigm creates the possibility to develop materials according to specific, rational designs from the molecular to the macroscopic scale. We discuss promising techniques in experimental small-scale material synthesis and large-scale fabrication methods to manipulate atomistic or macroscale structures, which can be designed by computational modeling. These include recombinant protein technology to produce peptides and proteins with tailored sequences encoded by recombinant DNA, self-assembly processes induced by conformational transition of proteins, additive manufacturing for designing complex structures, and qualitative and quantitative characterization of materials at different length scales. We describe important material characterization techniques using numerous methods of spectroscopy and microscopy. We detail numerous multi-scale computational modeling techniques that complements these experimental techniques: DFT at the atomistic scale; fully atomistic and coarse-grain molecular dynamics at the molecular to mesoscale; continuum modeling at the macroscale. Additionally, we present case studies that utilize experimental and computational approaches in an integrated manner to broaden our understanding of the properties of two-dimensional materials and materials based on silk and silk-elastin-like proteins.
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Affiliation(s)
- Jingjie Yeo
- Laboratory for Atomistic and Molecular Mechanics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Institute of High Performance Computing, Agency for Science, Technology and Research (A*STAR), Singapore 138632
| | - Gang Seob Jung
- Laboratory for Atomistic and Molecular Mechanics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Francisco J. Martín-Martínez
- Laboratory for Atomistic and Molecular Mechanics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Shengjie Ling
- Laboratory for Atomistic and Molecular Mechanics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China
| | - Grace X. Gu
- Laboratory for Atomistic and Molecular Mechanics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Zhao Qin
- Laboratory for Atomistic and Molecular Mechanics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Markus J. Buehler
- Laboratory for Atomistic and Molecular Mechanics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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16
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Humenik M, Lang G, Scheibel T. Silk nanofibril self-assembly versus electrospinning. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2018; 10:e1509. [PMID: 29393590 DOI: 10.1002/wnan.1509] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 10/18/2017] [Accepted: 12/19/2017] [Indexed: 01/16/2023]
Abstract
Natural silk fibers represent one of the most advanced blueprints for (bio)polymer scientists, displaying highly optimized mechanical properties due to their hierarchical structures. Biotechnological production of silk proteins and implementation of advanced processing methods enabled harnessing the potential of these biopolymer not just based on the mechanical properties. In addition to fibers, diverse morphologies can be produced, such as nonwoven meshes, films, hydrogels, foams, capsules and particles. Among them, nanoscale fibrils and fibers are particularly interesting concerning medical and technical applications due to their biocompatibility, environmental and mechanical robustness as well as high surface-to-volume ratio. Therefore, we introduce here self-assembly of silk proteins into hierarchically organized structures such as supramolecular nanofibrils and fabricated materials based thereon. As an alternative to self-assembly, we also present electrospinning a technique to produce nanofibers and nanofibrous mats. Accordingly, we introduce a broad range of silk-based dopes, used in self-assembly and electrospinning: natural silk proteins originating from natural spinning glands, natural silk protein solutions reconstituted from fibers, engineered recombinant silk proteins designed from natural blueprints, genetic fusions of recombinant silk proteins with other structural or functional peptides and moieties, as well as hybrids of recombinant silk proteins chemically conjugated with nonproteinaceous biotic or abiotic molecules. We highlight the advantages but also point out drawbacks of each particular production route. The scope includes studies of the natural self-assembly mechanism during natural silk spinning, production of silk fibrils as new nanostructured non-native scaffolds allowing dynamic morphological switches, as well as studying potential applications. This article is categorized under: Biology-Inspired Nanomaterials > Peptide-Based Structures Nanotechnology Approaches to Biology > Nanoscale Systems in Biology Biology-Inspired Nanomaterials > Protein and Virus-Based Structures.
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Affiliation(s)
- Martin Humenik
- Biomaterials, Faculty of Engineering Science, University of Bayreuth, Bayreuth, Germany
| | - Gregor Lang
- Biomaterials, Faculty of Engineering Science, University of Bayreuth, Bayreuth, Germany
| | - Thomas Scheibel
- Biomaterials, Faculty of Engineering Science, University of Bayreuth, Bayreuth, Germany.,Bayreuth Center for Colloids and Interfaces (BZKG), Research Center Bio-Macromolecules (BIOmac), Bayreuth Center for Molecular Biosciences (BZMB), Bayreuth Center for Material Science (BayMAT), Bavarian Polymer Institute (BPI), Universität Bayreuth, Bayreuth, Germany
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17
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Isaacson KJ, Jensen MM, Watanabe AH, Green BE, Correa MA, Cappello J, Ghandehari H. Self-Assembly of Thermoresponsive Recombinant Silk-Elastinlike Nanogels. Macromol Biosci 2018; 18:10.1002/mabi.201700192. [PMID: 28869362 PMCID: PMC5806626 DOI: 10.1002/mabi.201700192] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 07/19/2017] [Indexed: 12/28/2022]
Abstract
Recombinant silk-elastinlike protein polymers (SELPs) combine the biocompatibility and thermoresponsiveness of human tropoelastin with the strength of silk. Direct control over structure of these monodisperse polymers allows for precise correlation of structure with function. This work describes the fabrication of the first SELP nanogels and evaluation of their physicochemical properties and thermoresponsiveness. Self-assembly of dilute concentrations of SELPs results in nanogels with enhanced stability over micelles due to physically crosslinked beta-sheet silk segments. The nanogels respond to thermal stimuli via size changes and aggregation. Modifying the ratio and sequence of silk to elastin in the polymer backbone results in alterations in critical gel formation concentration, stability, aggregation, size contraction temperature, and thermal reversibility. The nanogels sequester hydrophobic compounds and show promise in delivery of bioactive agents.
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Affiliation(s)
- Kyle J Isaacson
- Utah Center for Nanomedicine, Nano Institute of Utah, University of Utah, 36 S. Wasatch Dr., Salt Lake City, UT, 84112, USA
- Department of Bioengineering, University of Utah, 36 S. Wasatch Dr., Salt Lake City, UT, 84112, USA
| | - Mark Martin Jensen
- Utah Center for Nanomedicine, Nano Institute of Utah, University of Utah, 36 S. Wasatch Dr., Salt Lake City, UT, 84112, USA
- Department of Bioengineering, University of Utah, 36 S. Wasatch Dr., Salt Lake City, UT, 84112, USA
| | - Alexandre H Watanabe
- College of Pharmacy, University of Utah, 30 2000 E., Salt Lake City, UT, 84112, USA
| | - Bryant E Green
- Utah Center for Nanomedicine, Nano Institute of Utah, University of Utah, 36 S. Wasatch Dr., Salt Lake City, UT, 84112, USA
- Department of Bioengineering, University of Utah, 36 S. Wasatch Dr., Salt Lake City, UT, 84112, USA
| | - Marcelo A Correa
- Utah Center for Nanomedicine, Nano Institute of Utah, University of Utah, 36 S. Wasatch Dr., Salt Lake City, UT, 84112, USA
- Department of Bioengineering, University of Utah, 36 S. Wasatch Dr., Salt Lake City, UT, 84112, USA
| | - Joseph Cappello
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, 30 S. 2000 E., Salt Lake City, UT, 84112, USA
| | - Hamidreza Ghandehari
- Utah Center for Nanomedicine, Nano Institute of Utah, University of Utah, 36 S. Wasatch Dr., Salt Lake City, UT, 84112, USA
- Department of Bioengineering, University of Utah, 36 S. Wasatch Dr., Salt Lake City, UT, 84112, USA
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, 30 S. 2000 E., Salt Lake City, UT, 84112, USA
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18
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Barros RC, Gelens E, Bulten E, Tuin A, de Jong MR, Kuijer R, van Kooten TG. Self-assembled nanofiber coatings for controlling cell responses. J Biomed Mater Res A 2017; 105:2252-2265. [PMID: 28513985 DOI: 10.1002/jbm.a.36092] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 03/22/2017] [Accepted: 04/14/2017] [Indexed: 01/29/2023]
Abstract
Nanofibers are thought to enhance cell adhesion, growth, and function. We demonstrate that the choice of building blocks in self-assembling nanofiber systems can be used to control cell behavior. The use of 2 D-coated, self-assembled nanofibers in controlling lens epithelial cells, fibroblasts, and mesenchymal stem cells was investigated, focusing on gene and protein expression related to the fibrotic response. To this end, three nanofibers with different characteristics (morphology, topography, and wettability) were compared with two standard materials frequently used in culturing cells, TCPS, and a collagen type I coating. Cell metabolic activity, cell morphology, and gene and protein expression were analyzed. The most hydrophilic nanofiber with more compact network consisting of small fibers proved to provide a beneficial 2 D environment for cell proliferation and matrix formation while decreasing the fibrotic/stress behavior in all cell lines when compared with TCPS and the collagen type I coating. This nanofiber demonstrates the potential to be used as a biomimetic coating to study the development of fibrosis through epithelial-to-mesenchymal transition. This study also shows that nanofiber structures do not enhance cell function by definition, because the physico-chemical characteristics of the nanofibers influence cell behavior as well and actually can be used to regulate cell behavior toward suboptimal performance. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 2252-2265, 2017.
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Affiliation(s)
- Raquel C Barros
- Department of Biomedical Engineering, University Medical Center Groningen (UMCG), University of Groningen, Hanzeplein 1, 9713, GZ Groningen, The Netherlands
| | - Edith Gelens
- Nano Fiber Matrices B.V. (Nano-FM), Zernikepark 6-8, Groningen, 9747 AN, The Netherlands
| | - Erna Bulten
- Nano Fiber Matrices B.V. (Nano-FM), Zernikepark 6-8, Groningen, 9747 AN, The Netherlands
| | - Annemarie Tuin
- Nano Fiber Matrices B.V. (Nano-FM), Zernikepark 6-8, Groningen, 9747 AN, The Netherlands
| | - Menno R de Jong
- Nano Fiber Matrices B.V. (Nano-FM), Zernikepark 6-8, Groningen, 9747 AN, The Netherlands
| | - Roel Kuijer
- Department of Biomedical Engineering, University Medical Center Groningen (UMCG), University of Groningen, Hanzeplein 1, 9713, GZ Groningen, The Netherlands
| | - Theo G van Kooten
- Department of Biomedical Engineering, University Medical Center Groningen (UMCG), University of Groningen, Hanzeplein 1, 9713, GZ Groningen, The Netherlands
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19
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Schmuck B, Sandgren M, Härd T. A fine-tuned composition of protein nanofibrils yields an upgraded functionality of displayed antibody binding domains. Biotechnol J 2017; 12. [DOI: 10.1002/biot.201600672] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Revised: 03/02/2017] [Accepted: 03/31/2017] [Indexed: 01/18/2023]
Affiliation(s)
- Benjamin Schmuck
- Department of Molecular Sciences; Swedish University of Agricultural Sciences; Uppsala Sweden
| | - Mats Sandgren
- Department of Molecular Sciences; Swedish University of Agricultural Sciences; Uppsala Sweden
| | - Torleif Härd
- Department of Molecular Sciences; Swedish University of Agricultural Sciences; Uppsala Sweden
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20
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Tarakanova A, Huang W, Qin Z, Kaplan DL, Buehler MJ. Modeling and Experiment Reveal Structure and Nanomechanics across the Inverse Temperature Transition in B. mori Silk-Elastin-like Protein Polymers. ACS Biomater Sci Eng 2017; 3:2889-2899. [PMID: 33418710 DOI: 10.1021/acsbiomaterials.6b00688] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Silk and elastin are exemplary protein materials that exhibit exceptional material properties. Silk is uniquely strong, surpassing engineering materials such as Kevlar and steel, while elastin has exquisite flexibility and can reversibly fold into a more structured form at high temperatures when many other proteins would unfold and denature. This phenomenon in elastin is termed the inverse temperature transition. It is a reversible, controllable process that motivates applications in drug delivery, shape change materials, and biomimetic devices. Silk-elastinlike protein polymers (SELPs), which combine repeating B. mori silk and elastin blocks, have been introduced as biologically inspired materials that combine the distinctive properties of the component parts to achieve strong and extensible, tunable biomaterials. Here, we considered a single SELP sequence to examine temperature transition effects at the molecular scale. SELP molecular models were created using Replica Exchange Molecular Dynamics, an accelerated sampling method, and confirmed in experiment by comparing secondary structure distributions. A molecular collapse of the SELP molecule was observed with increased temperature in both molecular simulation and experiment. Temperature-specific differences were observed in the mechanical properties and the unfolding pathways of the polypeptide. Using the Bell-Evans model, we analyzed the free energy landscape associated with molecular unfolding at temperatures below and above the transition temperature range (Tt) of the polypeptide. We found that at physiological pulling rates, the energy barrier to unfold SELPs was counterintuitively higher above Tt. Our findings offer a foundational perspective on the molecular scale mechanisms of temperature-induced phase transition in SELPs, and suggest a novel approach to combine simulation and experiment to study materials for multifunctional biomimetic applications.
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Affiliation(s)
- Anna Tarakanova
- Laboratory for Atomistic and Molecular Mechanics, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 1-290, Cambridge, Massachusetts 02139, United States
| | - Wenwen Huang
- Department of Biomedical Engineering, Tufts University, Science & Technology Center, Room 251, Medford, Massachusetts 02155, United States
| | - Zhao Qin
- Laboratory for Atomistic and Molecular Mechanics, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 1-290, Cambridge, Massachusetts 02139, United States
| | - David L Kaplan
- Department of Biomedical Engineering, Tufts University, Science & Technology Center, Room 251, Medford, Massachusetts 02155, United States
| | - Markus J Buehler
- Laboratory for Atomistic and Molecular Mechanics, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 1-290, Cambridge, Massachusetts 02139, United States
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21
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Kundu B, Eltohamy M, Yadavalli VK, Kundu SC, Kim HW. Biomimetic Designing of Functional Silk Nanotopography Using Self-assembly. ACS APPLIED MATERIALS & INTERFACES 2016; 8:28458-28467. [PMID: 27686123 DOI: 10.1021/acsami.6b07872] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In nature inorganic-organic building units create multifunctional hierarchical architectures. Organic silk protein is particularly attractive in this respect because of its micro-nanoscale structural blocks that are attributed to sophisticated hierarchical assembly imparting flexibility and compressibility to designed biohybrid materials. In the present study, aqueous silk fibroin is assembled to form nano/microtopography on inorganic silica surface via a facile diffusion-limited aggregation process. This process is driven by electrostatic interaction and only possible at a specified aminated surface chemistry. The self-assembled topography depends on the age and concentration of protein solution as well as on the surface charge distribution of the template. The self-assembled silk trails closely resemble natural cypress leaf architecture, which is considered a structural analogue of neuronal cortex. This assembled surface significantly enhances anchorage of neuronal cell and cytoskeletal extensions, providing an effective nano/microtopographical cue for cellular recognition and guidance.
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Affiliation(s)
| | - Mohamed Eltohamy
- Glass Research Department, National Research Centre , Dokki, Cairo, Egypt
| | - Vamsi K Yadavalli
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University , Richmond, Virginia 23284, United States
| | - Subhas C Kundu
- Department of Biotechnology, Indian Institute of Technology Kharagpur , Kharagpur, West Bengal 721302, India
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22
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Kumar A, Lowe CP, Cohen Stuart MA, Bolhuis PG. Trigger sequence can influence final morphology in the self-assembly of asymmetric telechelic polymers. SOFT MATTER 2016; 12:2095-2107. [PMID: 26754000 DOI: 10.1039/c5sm01453k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report on a numerical study of polymer network formation of asymmetric biomimetic telechelic polymers with two reactive ends based on a self-assembling collagen, elastin or silk-like polypeptide sequence. The two reactive ends of the polymer can be activated independently using physicochemical triggers such as temperature and pH. We show, using a simple coarse grained model that the order in which this triggering occurs influences the final morphology. For both of collagen-silk and elastin-silk topologies we find that for relatively short connector chains the morphology of the assembly is greatly influenced by the order of the trigger, whereas for longer chains the equilibrium situation is more easily achieved. Moreover, self-assembly is greatly enhanced at moderate collagen interaction strength, due to facilitated binding and unbinding of the peptides. This finding indicates that both the trigger sequence and strength can be used to steer self-assembly in these biomimetic polymer systems.
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Affiliation(s)
- Aatish Kumar
- Amsterdam Center for Multiscale Modeling, van't Hoff Institute for Molecular Sciences, University of Amsterdam, PO Box 94157 1090 GD Amsterdam, The Netherlands.
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23
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Shankhwar N, Kumar M, Mandal BB, Robi PS, Srinivasan A. Electrospun polyvinyl alcohol-polyvinyl pyrrolidone nanofibrous membranes for interactive wound dressing application. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2015; 27:247-62. [PMID: 26573740 DOI: 10.1080/09205063.2015.1120474] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Cross-linked polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP) composite nanofibrous membranes have been prepared by electrospinning. Mechanical properties of the membranes improved significantly with PVP addition. PVP improved hydrophilicity and sustainable degradation of the membranes. Biocompatibility of the membranes was assessed by in vitro culture of native skin cells (L929 fibroblast and HaCaT keratinocytes). Tests showed sustained release of the antibiotic ciprofloxacin hydrochloride monohydrate by the membranes. Further, zone of inhibition study against Staphylococcus aureus growth demonstrated protective action against external pathogenic microbes. These studies show these simple PVA-PVP nanofibrous membranes are promising interactive antibiotic-eluting wound dressing materials.
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Affiliation(s)
- Nisha Shankhwar
- a Department of Physics , Indian Institute of Technology Guwahati , Guwahati , India
| | - Manishekhar Kumar
- b Biomaterials Tissue Engineering Laboratory, Department of Biosciences Bioengineering , Indian Institute of Technology Guwahati , Guwahati , India
| | - Biman B Mandal
- b Biomaterials Tissue Engineering Laboratory, Department of Biosciences Bioengineering , Indian Institute of Technology Guwahati , Guwahati , India
| | - P S Robi
- c Department of Mechanical Engineering , Indian Institute of Technology Guwahati , Guwahati , India
| | - A Srinivasan
- a Department of Physics , Indian Institute of Technology Guwahati , Guwahati , India
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24
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Yeo GC, Aghaei-Ghareh-Bolagh B, Brackenreg EP, Hiob MA, Lee P, Weiss AS. Fabricated Elastin. Adv Healthc Mater 2015; 4:2530-2556. [PMID: 25771993 PMCID: PMC4568180 DOI: 10.1002/adhm.201400781] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2014] [Revised: 02/09/2015] [Indexed: 12/18/2022]
Abstract
The mechanical stability, elasticity, inherent bioactivity, and self-assembly properties of elastin make it a highly attractive candidate for the fabrication of versatile biomaterials. The ability to engineer specific peptide sequences derived from elastin allows the precise control of these physicochemical and organizational characteristics, and further broadens the diversity of elastin-based applications. Elastin and elastin-like peptides can also be modified or blended with other natural or synthetic moieties, including peptides, proteins, polysaccharides, and polymers, to augment existing capabilities or confer additional architectural and biofunctional features to compositionally pure materials. Elastin and elastin-based composites have been subjected to diverse fabrication processes, including heating, electrospinning, wet spinning, solvent casting, freeze-drying, and cross-linking, for the manufacture of particles, fibers, gels, tubes, sheets and films. The resulting materials can be tailored to possess specific strength, elasticity, morphology, topography, porosity, wettability, surface charge, and bioactivity. This extraordinary tunability of elastin-based constructs enables their use in a range of biomedical and tissue engineering applications such as targeted drug delivery, cell encapsulation, vascular repair, nerve regeneration, wound healing, and dermal, cartilage, bone, and dental replacement.
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Affiliation(s)
- Giselle C. Yeo
- Charles Perkins Centre, The University of Sydney, NSW 2006, Australia
- School of Molecular Bioscience, The University of Sydney, NSW 2006, Australia
| | - Behnaz Aghaei-Ghareh-Bolagh
- Charles Perkins Centre, The University of Sydney, NSW 2006, Australia
- School of Molecular Bioscience, The University of Sydney, NSW 2006, Australia
| | - Edwin P. Brackenreg
- Charles Perkins Centre, The University of Sydney, NSW 2006, Australia
- School of Molecular Bioscience, The University of Sydney, NSW 2006, Australia
| | - Matti A. Hiob
- Charles Perkins Centre, The University of Sydney, NSW 2006, Australia
- School of Molecular Bioscience, The University of Sydney, NSW 2006, Australia
| | - Pearl Lee
- Charles Perkins Centre, The University of Sydney, NSW 2006, Australia
- School of Molecular Bioscience, The University of Sydney, NSW 2006, Australia
| | - Anthony S. Weiss
- Charles Perkins Centre, The University of Sydney, NSW 2006, Australia
- School of Molecular Bioscience, The University of Sydney, NSW 2006, Australia
- Bosch Institute, The University of Sydney, NSW 2006, Australia
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25
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Jung SH, Choi JW, Yun CO, Kim SH, Kwon IC, Ghandehari H. Direct Observation of Interactions of Silk-Elastinlike Protein Polymer with Adenoviruses and Elastase. Mol Pharm 2015; 12:1673-9. [DOI: 10.1021/acs.molpharmaceut.5b00075] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Se-Hui Jung
- Center
for Theragnosis, Biomedical Research Institute, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu,
Seoul 136-791, Korea
| | - Joung-Woo Choi
- Department
of Bioengineering, College of Engineering, Hanyang University, Seoul, Korea
| | - Chae-Ok Yun
- Department
of Bioengineering, College of Engineering, Hanyang University, Seoul, Korea
| | - Sun Hwa Kim
- Center
for Theragnosis, Biomedical Research Institute, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu,
Seoul 136-791, Korea
| | - Ick Chan Kwon
- Center
for Theragnosis, Biomedical Research Institute, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu,
Seoul 136-791, Korea
| | - Hamidreza Ghandehari
- Center
for Theragnosis, Biomedical Research Institute, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu,
Seoul 136-791, Korea
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26
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Ni R, Kleijn JM, Abeln S, Cohen Stuart MA, Bolhuis PG. Competition between surface adsorption and folding of fibril-forming polypeptides. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 91:022711. [PMID: 25768535 DOI: 10.1103/physreve.91.022711] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Indexed: 06/04/2023]
Abstract
Self-assembly of polypeptides into fibrillar structures can be initiated by planar surfaces that interact favorably with certain residues. Using a coarse-grained model, we systematically studied the folding and adsorption behavior of a β-roll forming polypeptide. We find that there are two different folding pathways depending on the temperature: (i) at low temperature, the polypeptide folds in solution into a β-roll before adsorbing onto the attractive surface; (ii) at higher temperature, the polypeptide first adsorbs in a disordered state and folds while on the surface. The folding temperature increases with increasing attraction as the folded β-roll is stabilized by the surface. Surprisingly, further increasing the attraction lowers the folding temperature again, as strong attraction also stabilizes the adsorbed disordered state, which competes with folding of the polypeptide. Our results suggest that to enhance the folding, one should use a weakly attractive surface. They also explain the recent experimental observation of the nonmonotonic effect of charge on the fibril formation on an oppositely charged surface [C. Charbonneau et al., ACS Nano 8, 2328 (2014)].
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Affiliation(s)
- Ran Ni
- Van 't Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands
| | - J Mieke Kleijn
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands
| | - Sanne Abeln
- Centre for Integrative Bioinformatics (IBIVU), Vrije Universiteit, De Boelelaan 1081A, 1081 HV Amsterdam, The Netherlands
| | - Martien A Cohen Stuart
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands
| | - Peter G Bolhuis
- Van 't Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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de Moraes MA, Crouzier T, Rubner M, Beppu MM. Factors Controlling the Deposition of Silk Fibroin Nanofibrils during Layer-by-Layer Assembly. Biomacromolecules 2014; 16:97-104. [DOI: 10.1021/bm5012135] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Mariana Agostini de Moraes
- 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, 09913-030 Diadema, SP, Brazil
| | | | | | - Marisa Masumi Beppu
- School
of Chemical Engineering, University of Campinas, UNICAMP, 13083-852 Campinas, SP, Brazil
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Huang W, Rollett A, Kaplan DL. Silk-elastin-like protein biomaterials for the controlled delivery of therapeutics. Expert Opin Drug Deliv 2014; 12:779-91. [PMID: 25476201 DOI: 10.1517/17425247.2015.989830] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
INTRODUCTION Genetically engineered biomaterials are useful for controlled delivery owing to their rational design, tunable structure-function, biocompatibility, degradability and target specificity. Silk-elastin-like proteins (SELPs), a family of genetically engineered recombinant protein polymers, possess these properties. Additionally, given the benefits of combining semi-crystalline silk-blocks and elastomeric elastin-blocks, SELPs possess multi-stimuli-responsive properties and tunability, thereby becoming promising candidates for targeted cancer therapeutics delivery and controlled gene release. AREAS COVERED An overview of SELP biomaterials for drug delivery and gene release is provided. Biosynthetic strategies used for SELP production, fundamental physicochemical properties and self-assembly mechanisms are discussed. The review focuses on sequence-structure-function relationships, stimuli-responsive features and current and potential drug delivery applications. EXPERT OPINION The tunable material properties allow SELPs to be pursued as promising biomaterials for nanocarriers and injectable drug release systems. Current applications of SELPs have focused on thermally-triggered biomaterial formats for the delivery of therapeutics, based on local hyperthermia in tumors or infections. Other prominent controlled release applications of SELPs as injectable hydrogels for gene release have also been pursued. Further biomedical applications that utilize other stimuli to trigger the reversible material responses of SELPs for targeted delivery, including pH, ionic strength, redox, enzymatic stimuli and electric field, are in progress. Exploiting these additional stimuli-responsive features will provide a broader range of functional biomaterials for controlled therapeutics release and tissue regeneration.
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Affiliation(s)
- Wenwen Huang
- Tufts University, Department of Biomedical Engineering , 4 Colby Street, Medford, MA 02155 , USA
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29
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Fernández-Colino A, Arias FJ, Alonso M, Rodríguez-Cabello JC. Self-organized ECM-mimetic model based on an amphiphilic multiblock silk-elastin-like corecombinamer with a concomitant dual physical gelation process. Biomacromolecules 2014; 15:3781-93. [PMID: 25230341 DOI: 10.1021/bm501051t] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Although significant progress has been made in the area of injectable hydrogels for biomedical applications and model cell niches, further improvements are still needed, especially in terms of mechanical performance, stability, and biomimicry of the native fibrillar architecture found in the extracellular matrix (ECM). This work focuses on the design and production of a silk-elastin-based injectable multiblock corecombinamer that spontaneously forms a stable physical nanofibrillar hydrogel under physiological conditions. That differs from previously reported silk-elastin-like polymers on a major content and predominance of the elastin-like part, as well as a more complex structure and behavior of such a part of the molecule, which is aimed to obtain well-defined hydrogels. Rheological and DSC experiments showed that this system displays a coordinated and concomitant dual gelation mechanism. In a first stage, a rapid, thermally driven gelation of the corecombinamer solution takes place once the system reaches body temperature due to the thermal responsiveness of the elastin-like (EL) parts and the amphiphilic multiblock design of the corecombinamer. A bridged micellar structure is the dominant microscopic feature of this stage, as demonstrated by AFM and TEM. Completion of the initial stage triggers the second, which is comprised of a stabilization, reinforcement, and microstructuring of the gel. FTIR analysis shows that these events involve the formation of β-sheets around the silk motifs. The emergence of such β-sheet structures leads to the spontaneous self-organization of the gel into the final fibrous structure. Despite the absence of biological cues, here we set the basis of the minimal structure that is able to display such a set of physical properties and undergo microscopic transformation from a solution to a fibrous hydrogel. The results point to the potential of this system as a basis for the development of injectable fibrillar biomaterial platforms toward a fully functional, biomimetic, artificial extracellular matrix, and cell niches.
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Affiliation(s)
- Alicia Fernández-Colino
- G.I.R. Bioforge, University of Valladolid, CIBER-BBN , Paseo de Belén 11, 47011 Valladolid, Spain
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30
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Sayin E, Baran ET, Hasirci V. Protein-based materials in load-bearing tissue-engineering applications. Regen Med 2014; 9:687-701. [DOI: 10.2217/rme.14.52] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Proteins such as collagen and elastin are robust molecules that constitute nanocomponents in the hierarchically organized ultrastructures of bone and tendon as well as in some of the soft tissues that have load-bearing functions. In the present paper, the macromolecular structure and function of the proteins are reviewed and the potential of mammalian and non-mammalian proteins in the engineering of load-bearing tissue substitutes are discussed. Chimeric proteins have become an important structural biomaterial source and their potential in tissue engineering is highlighted. Processing of proteins challenge investigators and in this review rapid prototyping and microfabrication are proposed as methods for obtaining precisely defined custom-built tissue engineered structures with intrinsic microarchitecture.
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Affiliation(s)
- Esen Sayin
- METU, Department of Biotechnology, Ankara, Turkey
- BIOMATEN, METU Center of Excellence in Biomaterials & Tissue Engineering, Ankara 06800, Turkey
| | - Erkan Türker Baran
- BIOMATEN, METU Center of Excellence in Biomaterials & Tissue Engineering, Ankara 06800, Turkey
| | - Vasif Hasirci
- METU, Department of Biotechnology, Ankara, Turkey
- BIOMATEN, METU Center of Excellence in Biomaterials & Tissue Engineering, Ankara 06800, Turkey
- METU, Departments of Biological Sciences, Ankara, Turkey
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31
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Mu Y, Yu M. Effects of hydrophobic interaction strength on the self-assembled structures of model peptides. SOFT MATTER 2014; 10:4956-4965. [PMID: 24888420 DOI: 10.1039/c4sm00378k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Stable and ordered self-assembled peptide nanostructures are formed as a result of cooperative effects of various relatively weak intermolecular interactions. We systematically studied the influence of hydrophobic interaction strength and temperature on the self-assembly of peptides with a coarse-grained model by Monte Carlo simulations. The simulation results show a rich phase behavior of peptide self-assembly, indicating that the formation and morphology of peptide assemblies may be tuned by varying the temperature and the strength of hydrophobic interactions. There exist optimal combinations of temperature and hydrophobic interaction strength where ordered fibrillar nanostructures are readily formed. Our simulation results not only facilitate the understanding of the self-assembly behavior of peptides at the molecular level, but also provide useful insights into the development of fabrication strategies for high-quality peptide fibrils.
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Affiliation(s)
- Yan Mu
- College of Materials Science and Engineering, South China University of Technology, Guangzhou, Guangdong, China.
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32
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Hwang W, Eryilmaz E. Kinetic signature of fractal-like filament networks formed by orientational linear epitaxy. PHYSICAL REVIEW LETTERS 2014; 113:025502. [PMID: 25062204 DOI: 10.1103/physrevlett.113.025502] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2014] [Indexed: 06/03/2023]
Abstract
We study a broad class of epitaxial assembly of filament networks on lattice surfaces. Over time, a scale-free behavior emerges with a 2.5-3 power-law exponent in filament length distribution. Partitioning between the power-law and exponential behaviors in a network can be used to find the stage and kinetic parameters of the assembly process. To analyze real-world networks, we develop a computer program that measures the network architecture in experimental images. Application to triaxial networks of collagen fibrils shows quantitative agreement with our model. Our unifying approach can be used for characterizing and controlling the network formation that is observed across biological and nonbiological systems.
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Affiliation(s)
- Wonmuk Hwang
- Departments of Biomedical Engineering and Materials Science & Engineering, Texas A&M University, College Station, Texas 77845, USA and School of Computational Sciences, Korea Institute for Advanced Study, Seoul 130-722, Korea
| | - Esma Eryilmaz
- Department of Physics, Texas A&M University, College Station, Texas 77845, USA
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Charbonneau C, Kleijn JM, Cohen Stuart MA. Subtle charge balance controls surface-nucleated self-assembly of designed biopolymers. ACS NANO 2014; 8:2328-2335. [PMID: 24571369 DOI: 10.1021/nn405799t] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report the surface-nucleated self-assembly into fibrils of a biosynthetic amino acid polymer synthesized by the yeast Pichia pastoris. This polymer has a block-like architecture, with a central silk-like block labeled SH, responsible for the self-assembly into fibrils, and two collagen-like random coil end blocks (C) that colloidally stabilize the fibers in aqueous solution. The silk-like block contains histidine residues (pKa≈6) that are positively charged in the low pH region, which hinders self-assembly. In aqueous solution, CSHC self-assembles into fibers above a pH-dependent critical nucleation concentration Ccb. Below Ccb, where no self-assembly occurs in solution, fibril formation can be induced by a negatively charged surface (silica) in the pH range of 3.5-7. The density of the fibers at the surface and their length are controlled by a subtle balance in charge between the protein polymer and the silica surface, which is evidenced from the dependence on pH. With increasing number density of the fibers at the surface, their average length decreases. The results can be explained on the basis of a nucleation-and-growth mechanism: the surface density of fibers depends on the rate of nucleation, while their growth rate is limited by transport of proteins from solution. Screening of the charges on the surface and histidine units by adding NaCl influences the nucleation-and-growth process in a complicated fashion: at low pH, the growth is improved, while at high pH, the nucleation is limited. Under conditions where nucleation in the bulk solution is not possible, growth of the surface-nucleated fibers into the solution--away from the surface--can still occur.
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Affiliation(s)
- Céline Charbonneau
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University , Dreijenplein 6, 6703 HB Wageningen, The Netherlands
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34
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Mu Y, Tang B, Yu M. Length-dependent β-sheet growth mechanisms of polyalanine peptides in water and on hydrophobic surfaces. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2014; 89:032711. [PMID: 24730878 DOI: 10.1103/physreve.89.032711] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Indexed: 06/03/2023]
Abstract
Fibrillar assemblies by peptides are becoming one of the most promising nanomaterials due to their exceptional properties. The self-assembly of peptides into β sheets is a critical step in the fibrillization pathway. We investigated the length-dependent β-sheet growth mechanisms of polyalanine [poly(A)] peptides consisting of 6 to 24 alanines (A6 to A24) in water and on the hydrophobic surface, respectively, by molecular dynamics simulations. β-sheet growth behavior in water fits negative exponential growth model, showing that β-sheet growth rate decays exponentially with time. Meanwhile, increasing chain length leads to an accelerated decay of the β-sheet growth rate. By contrast, β-sheet growth on the surface from A6 to A18 occurs in two consecutive stages, both of which fit linear growth models. β-sheet growth rate in the first stage increases as chain length is increased, while the intermediate length peptide A12 has the highest β-sheet growth rate in the second stage. β-sheet growth behavior of A24 on the surface still fits negative exponential model. Overall, the hydrophobic surface accelerates β-sheet growth by enhancing local concentration and reducing conformational entropy of poly(A) peptide, and the β-sheet growth of the intermediate length peptide A12 is the fastest on the surface. Our simulation results shed light on understanding the accelerated peptide fibrillization on the hydrophobic surface.
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Affiliation(s)
- Yan Mu
- College of Materials Science and Engineering, South China University of Technology, Guangzhou Guangdong, 510641, China
| | - Binqing Tang
- College of Materials Science and Engineering, South China University of Technology, Guangzhou Guangdong, 510641, China
| | - Meng Yu
- College of Materials Science and Engineering, South China University of Technology, Guangzhou Guangdong, 510641, China
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35
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Zeng L, Teng W, Jiang L, Cappello J, Wu X. Ordering recombinant silk-elastin-like nanofibers on the microscale. APPLIED PHYSICS LETTERS 2014; 104:033702. [PMID: 24753621 PMCID: PMC3977850 DOI: 10.1063/1.4863077] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Accepted: 12/29/2013] [Indexed: 05/05/2023]
Abstract
Self-assembled peptide/polypeptide nanofibers are appealing building blocks for creating complex three-dimensional structures. However, ordering assembled peptide/polypeptide nanofibers into three-dimensional structures on the microscale remains challenging and often requires the employment of top-down approaches. We report that silk-elastin-like protein polymers self-assemble into nanofibers in physiologically relevant conditions, the assembled nanofibers further form fiber clusters on the microscale, and the nanofiber clusters eventually coalesce into three-dimensional structures with distinct nanoscale and microscale features. It is believed that the interplay between fiber growth and molecular diffusion leads to the ordering of the assembled silk-elastin-like nanofibers at the microscale.
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Affiliation(s)
- Like Zeng
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, USA
| | - Weibing Teng
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, USA
| | - Linan Jiang
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, USA
| | - Joseph Cappello
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, USA
| | - Xiaoyi Wu
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, USA ; Biomedical Engineering IDP and Bio5 Institute, University of Arizona, Tucson, Arizona 85721, USA
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36
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TURNER PAULA, JOSHI GAURAVV, WEEKS CANDREW, WILLIAMSON RSCOTT, PUCKETT AAROND, JANORKAR AMOLV. NANO AND MICRO-STRUCTURES OF ELASTIN-LIKE POLYPEPTIDE-BASED MATERIALS AND THEIR APPLICATIONS: RECENT DEVELOPMENTS. ACTA ACUST UNITED AC 2014. [DOI: 10.1142/s1793984413430022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Elastin-like polypeptide (ELP) containing materials have spurred significant research interest for biomedical applications exploiting their biocompatible, biodegradable and nonimmunogenic nature while maintaining precise control over their chemical structure and functionality through genetic engineering. Physical, mechanical and biological properties of ELPs could be further manipulated using genetic engineering or through conjugation with a variety of chemical moieties. These chemical and physical modifications also achieve interesting micro- and nanostructured ELP-based materials. Here, we review the recent developments during the past decade in the methods to engineer elastin-like materials, available genetic and chemical modification methods and applications of ELP micro and nanostructures in tissue engineering and drug delivery.
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Affiliation(s)
- PAUL A. TURNER
- Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS 39216, USA
| | - GAURAV V. JOSHI
- Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS 39216, USA
| | - C. ANDREW WEEKS
- Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS 39216, USA
| | - R. SCOTT WILLIAMSON
- Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS 39216, USA
| | - AARON D. PUCKETT
- Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS 39216, USA
| | - AMOL V. JANORKAR
- Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS 39216, USA
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Varongchayakul N, Johnson S, Quabili T, Cappello J, Ghandehari H, Solares SDJ, Hwang W, Seog J. Direct observation of amyloid nucleation under nanomechanical stretching. ACS NANO 2013; 7:7734-7743. [PMID: 23987654 DOI: 10.1021/nn402322k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Self-assembly of amyloid nanofiber is associated with both functional biological and pathological processes such as those in neurodegenerative diseases. Despite intensive studies, the stochastic nature of the process has made it difficult to elucidate a molecular mechanism for the key amyloid nucleation event. Here we investigated nucleation of the silk-elastin-like peptide (SELP) amyloid using time-lapse lateral force microscopy (LFM). By repeated scanning of a single line on a SELP-coated mica surface, we observed a sudden stepwise height increase. This corresponds to nucleation of an amyloid fiber, which subsequently grew perpendicular to the scanning direction. The lateral force profiles followed either a worm-like chain model or an exponential function, suggesting that the atomic force microscopy (AFM) tip stretches a single or multiple SELP molecules along the scanning direction. The probability of nucleation correlated with the maximum stretching force and extension, implying that stretching of SELP molecules is a key molecular event for amyloid nucleation. The mechanically induced nucleation allows for positional and directional control of amyloid assembly in vitro, which we demonstrate by generating single nanofibers at predetermined nucleation sites.
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Affiliation(s)
- Nitinun Varongchayakul
- Department of Materials Science and Engineering, ‡Fischell Department of Bioengineering, ¶Department of Mechanical Engineering, University of Maryland , College Park, Maryland 20742, United States
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Hu X, Tang-Schomer MD, Huang W, Xia XX, Weiss AS, Kaplan DL. Charge-Tunable Silk-Tropoelastin Protein Alloys That Control Neuron Cell Responses. ADVANCED FUNCTIONAL MATERIALS 2013; 23:3875-3884. [PMID: 25093018 PMCID: PMC4118775 DOI: 10.1002/adfm.201202685] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Tunable protein composites are important for constructing extracellular matrix mimics of human tissues with control of biochemical, structural, and mechanical properties. Molecular interaction mechanisms between silk fibroin protein and recombinant human tropoelastin, based on charge, are utilized to generate a new group of multifunctional protein alloys (mixtures of silk and tropoelastin) with different net charges. These new biomaterials are then utilized as a biomaterial platform to control neuron cell response. With a +38 net charge in water, tropoelastin molecules provide extraordinary elasticity and selective interactions with cell surface integrins. In contrast, negatively charged silk fibroin protein (net charge -36) provides remarkable toughness and stiffness with morphologic stability in material formats via autoclaving-induced beta-sheet crystal physical crosslinks. The combination of these properties in alloy format extends the versatility of both structural proteins, providing a new biomaterial platform. The alloys with weak positive charges (silk/tropoelastin mass ratio 75/25, net charge around +16) significantly improved the formation of neuronal networks and maintained cell viability of rat cortical neurons after 10 days in vitro. The data point to these protein alloys as an alternative to commonly used poly-L-lysine (PLL) coatings or other charged synthetic polymers, particularly with regard to the versatility of material formats (e.g., gels, sponges, films, fibers). The results also provide a practical example of physically designed protein materials with control of net charge to direct biological outcomes, in this case for neuronal tissue engineering.
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Affiliation(s)
- Xiao Hu
- Department of Biomedical Engineering, Tufts University, Medford, MA 02155 (USA)
| | - Min D. Tang-Schomer
- Department of Biomedical Engineering, Tufts University, Medford, MA 02155 (USA)
| | - Wenwen Huang
- Department of Biomedical Engineering, Tufts University, Medford, MA 02155 (USA)
| | - Xiao-Xia Xia
- Department of Biomedical Engineering, Tufts University, Medford, MA 02155 (USA)
| | - Anthony S. Weiss
- School of Molecular Bioscience, The University of Sydney, Sydney, NSW 2006 (Australia)
| | - David L. Kaplan
- Department of Biomedical Engineering, Tufts University, Medford, MA 02155 (USA)
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Salts drive controllable multilayered upright assembly of amyloid-like peptides at mica/water interface. Proc Natl Acad Sci U S A 2013; 110:8543-8. [PMID: 23650355 DOI: 10.1073/pnas.1220711110] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Surface-assisted self-assembly of amyloid-like peptides has received considerable interest in both amyloidosis research and nanotechnology in recent years. Despite extensive studies, some controlling factors, such as salts, are still not well understood, even though it is known that some salts can promote peptide self-assemblies through the so-called "salting-out" effect. However, they are usually noncontrollable, disordered, amorphous aggregates. Here, we show via a combined experimental and theoretical approach that a conserved consensus peptide NH2-VGGAVVAGV-CONH2 (GAV-9) (from representative amyloidogenic proteins) can self-assemble into highly ordered, multilayered nanofilaments, with surprising all-upright conformations, under high-salt concentrations. Our atomic force microscopy images also demonstrate that the vertical stacking of multiple layers is highly controllable by tuning the ionic strength, such as from 0 mM (monolayer) to 100 mM (mainly double layer), and to 250 mM MgCl2 (double, triple, quadruple, and quintuple layers). Our atomistic molecular dynamics simulations then reveal that these individual layers have very different internal nanostructures, with parallel β-sheets in the first monolayer but antiparallel β-sheets in the subsequent upper layers due to their different microenvironment. Further studies show that the growth of multilayered, all-upright nanostructures is a common phenomenon for GAV-9 at the mica/water interface, under a variety of salt types and a wide range of salt concentrations.
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40
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Li XX, Li KA, Qin JB, Ye KC, Yang XR, Li WM, Xie QS, Jiang ME, Zhang GX, Lu XW. In vivo MRI tracking of iron oxide nanoparticle-labeled human mesenchymal stem cells in limb ischemia. Int J Nanomedicine 2013; 8:1063-73. [PMID: 23515426 PMCID: PMC3598527 DOI: 10.2147/ijn.s42578] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Background Stem cell transplantation has been investigated for repairing damaged tissues in various injury models. Monitoring the safety and fate of transplanted cells using noninvasive methods is important to advance this technique into clinical applications. Methods In this study, lower-limb ischemia models were generated in nude mice by femoral artery ligation. As negative-contrast agents, positively charged magnetic iron oxide nanoparticles (aminopropyltriethoxysilane-coated Fe2O3) were investigated in terms of in vitro labeling efficiency, effects on human mesenchymal stromal cell (hMSC) proliferation, and in vivo magnetic resonance imaging (MRI) visualization. Ultimately, the mice were sacrificed for histological analysis three weeks after transplantation. Results With efficient labeling, aminopropyltriethoxysilane-modified magnetic iron oxide nanoparticles (APTS-MNPs) did not significantly affect hMSC proliferation. In vivo, APTS-MNP-labeled hMSCs could be monitored by clinical 3 Tesla MRI for at least three weeks. Histological examination detected numerous migrated Prussian blue-positive cells, which was consistent with the magnetic resonance images. Some migrated Prussian blue-positive cells were positive for mature endothelial cell markers of von Willebrand factor and anti-human proliferating cell nuclear antigen. In the test groups, Prussian blue-positive nanoparticles, which could not be found in other organs, were detected in the spleen. Conclusion APTS-MNPs could efficiently label hMSCs, and clinical 3 Tesla MRI could monitor the labeled stem cells in vivo, which may provide a new approach for the in vivo monitoring of implanted cells.
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Affiliation(s)
- Xiang-Xiang Li
- Department of Vascular Surgery, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University, School of Medicine, People's Republic of China
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41
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Johnson S, Ko YK, Varongchayakul N, Lee S, Cappello J, Ghandehari H, Lee SB, Solares SD, Seog J. Directed patterning of the self-assembled silk-elastin-like nanofibers using a nanomechanical stimulus. Chem Commun (Camb) 2013; 48:10654-6. [PMID: 23000884 DOI: 10.1039/c2cc35384a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We investigate the effects of the frequency and density of a nanomechanical stimulus on nucleation and growth of silk-elastin-like protein polymer (SELP) nanofibers. Repetitive tappings are crucial to create nucleation areas and a potential molecular level mechanism was proposed. Using this technique mechanically guided nanofiber patterns were successfully created.
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Affiliation(s)
- Sara Johnson
- Fischell Department of Bioengineering, University of Maryland, College Park, MD, USA
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Gong R, Song Y, Guo Z, Li M, Jiang Y, Wan X. A clickable, highly soluble oligopeptide that easily forms organogels. Supramol Chem 2013. [DOI: 10.1080/10610278.2013.766735] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Ruiying Gong
- a Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , 189 Songling Road, Qingdao, Shandong Province , 266101 , P.R. China
| | - Yubao Song
- b Department of Chemistry , Qingdao University of Science and Technology , 53 Zhengzhou Road, Qingdao, Shandong Province , 266042 , P.R. China
| | - Zongxia Guo
- a Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , 189 Songling Road, Qingdao, Shandong Province , 266101 , P.R. China
| | - Ming Li
- b Department of Chemistry , Qingdao University of Science and Technology , 53 Zhengzhou Road, Qingdao, Shandong Province , 266042 , P.R. China
| | - Yi Jiang
- a Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , 189 Songling Road, Qingdao, Shandong Province , 266101 , P.R. China
| | - Xiaobo Wan
- a Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , 189 Songling Road, Qingdao, Shandong Province , 266101 , P.R. China
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43
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Burke KA, Legleiter J. Atomic force microscopy assays for evaluating polyglutamine aggregation in solution and on surfaces. Methods Mol Biol 2013; 1017:21-40. [PMID: 23719905 DOI: 10.1007/978-1-62703-438-8_2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Mutations which cause an expansion of CAG triplet repeats encoding polyglutamine (polyQ) are responsible for the subsequent misfolding of specific proteins that contribute directly to the pathogenesis of at least nine neurodegenerative disorders, including Huntington's disease (HD) and the spinocerebellar ataxias (SCAs). Expansion of polyQ tracts results in the aggregation of these proteins, potentially through a variety of precursor aggregates, into fibrillar structures. There may also be a variety of aggregates formed that are off-pathway to the formation of fibrils. Here, detailed protocols for analyzing the aggregation of mutant huntingtin (htt) fragments (associated with HD) and synthetic polyQ peptides with atomic force microscopy (AFM) are described. Ex situ AFM can be used to characterize htt aggregate formation and morphology. In situ AFM allows for tracking the formation and fate of individual polyQ peptide aggregates on surfaces. The interaction of htt with a variety of surfaces, including lipid bilayers, can also be investigated. Furthermore, the mechanical impact of htt on lipid surfaces can be studied using specialized AFM techniques. Methods to analyze AFM images of htt aggregates are also presented.
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Affiliation(s)
- Kathleen A Burke
- The C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV, USA
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44
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Johnson EK, Chen L, Kubiak PS, McDonald SF, Adams DJ, Cameron PJ. Surface nucleated growth of dipeptide fibres. Chem Commun (Camb) 2013; 49:8698-700. [DOI: 10.1039/c3cc44738c] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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45
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DiMarco RL, Heilshorn SC. Multifunctional materials through modular protein engineering. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:3923-40. [PMID: 22730248 DOI: 10.1002/adma.201200051] [Citation(s) in RCA: 116] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Indexed: 05/20/2023]
Abstract
The diversity of potential applications for protein-engineered materials has undergone profound recent expansion through a rapid increase in the library of domains that have been utilized in these materials. Historically, protein-engineered biomaterials have been generated from a handful of peptides that were selected and exploited for their naturally evolved functionalities. In recent years, the scope of the field has drastically expanded to include peptide domains that were designed through computational modeling, identified through high-throughput screening, or repurposed from wild type domains to perform functions distinct from their primary native applications. The strategy of exploiting a diverse library of peptide domains to design modular block copolymers enables the synthesis of multifunctional protein-engineered materials with a range of customizable properties and activities. As the diversity of peptide domains utilized in modular protein engineering continues to expand, a tremendous and ever-growing combinatorial expanse of material functionalities will result.
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Abstract
Hybrid biomaterials are systems created from components of at least two distinct classes of molecules, for example, synthetic macromolecules and proteins or peptide domains. The synergistic combination of two types of structures may produce new materials that possess unprecedented levels of structural organization and novel properties. This Review focuses on biorecognition-driven self-assembly of hybrid macromolecules into functional hydrogel biomaterials. First, basic rules that govern the secondary structure of peptides are discussed, and then approaches to the specific design of hybrid systems with tailor-made properties are evaluated, followed by a discussion on the similarity of design principles of biomaterials and macromolecular therapeutics. Finally, the future of the field is briefly outlined.
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Affiliation(s)
- Jindřich Kopeček
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, Utah 84112, USA.
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47
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Kopeček J, Yang J. “Intelligente” Biomaterialien durch Selbstorganisation von Hybridhydrogelen. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201201040] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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48
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Xia XX, Xu Q, Hu X, Qin G, Kaplan DL. Tunable self-assembly of genetically engineered silk--elastin-like protein polymers. Biomacromolecules 2011; 12:3844-50. [PMID: 21955178 DOI: 10.1021/bm201165h] [Citation(s) in RCA: 162] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Silk--elastin-like protein polymers (SELPs), consisting of the repeating units of silk and elastin blocks, combine a set of outstanding physical and biological properties of silk and elastin. Because of the unique properties, SELPs have been widely fabricated into various materials for the applications in drug delivery and tissue engineering. However, little is known about the fundamental self-assembly characteristics of these remarkable polymers. Here we propose a two-step self-assembly process of SELPs in aqueous solution for the first time and report the importance of the ratio of silk-to-elastin blocks in a SELP's repeating unit on the assembly of the SELP. Through precise tuning of the ratio of silk to elastin, various structures including nanoparticles, hydrogels, and nanofibers could be generated either reversibly or irreversibly. This assembly process might provide opportunities to generate innovative smart materials for biosensors, tissue engineering, and drug delivery. Furthermore, the newly developed SELPs in this study may be potentially useful as biomaterials for controlled drug delivery and biomedical engineering.
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Affiliation(s)
- Xiao-Xia Xia
- Department of Biomedical Engineering, Tufts University, Medford, Massachusetts 02155, United States
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Leow WW, Hwang W. Epitaxially guided assembly of collagen layers on mica surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:10907-13. [PMID: 21740026 DOI: 10.1021/la2018055] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Ordered assembly of collagen molecules on flat substrates has potential for various applications and serves as a model system for studying the assembly process. While previous studies demonstrated self-assembly of collagen on muscovite mica into highly ordered layers, the mechanism by which different conditions affect the resulting morphology remains to be elucidated. Using atomic force microscopy, we follow the assembly of collagen on muscovite mica at a concentration lower than the critical fibrillogenesis concentration in bulk. Initially, individual collagen molecules adsorb to mica and subsequently nucleate into fibrils possessing the 67 nm D-periodic bands. Emergence of fibrils aligned in parallel despite large interfibril distances agrees with an alignment mechanism guided by the underlying mica. The epitaxial growth was further confirmed by the formation of novel triangular networks of collagen fibrils on phlogopite mica, whose surface lattice is known to have a hexagonal symmetry, whereas the more widely used muscovite does not. Comparing collagen assembly on the two types of mica at different potassium concentrations revealed that potassium binds to the negatively charged mica surface and neutralizes it, thereby reducing the binding affinity of collagen and enhancing surface diffusion. These results suggest that collagen assembly on mica follows the surface adsorption, diffusion, nucleation, and growth pathway, where the growth direction is determined at the nucleation step. Comparison with other molecules that assemble similarly on mica supports generality of the proposed assembly mechanism, the knowledge of which will be useful for controlling the resulting surface morphologies.
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Affiliation(s)
- Wee Wen Leow
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas 77843, USA
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Teng W, Huang Y, Cappello J, Wu X. Optically transparent recombinant silk-elastinlike protein polymer films. J Phys Chem B 2011; 115:1608-15. [PMID: 21288001 PMCID: PMC3041846 DOI: 10.1021/jp109764f] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Recombinant protein polymers, evaluated extensively as biomaterials for applications in drug delivery and tissue engineering, are rarely reported as being optically transparent. Here we report the notable optical transparency of films composed of a genetically engineered silk-elastinlike protein polymer SELP-47K. SELP-47K films of 100 μm in thickness display a transmittance of 93% in the wavelength range of 350-800 nm. While covalent cross-linking of SELP-47K via glutaraldehyde decreases its transmittance to 77% at the wavelength of 800 nm, noncovalent cross-linking using methanol slightly increases it to 95%. Non- and covalent cross-linking of SELP-47K films also influences their secondary structures and water contents. Cell viability and proliferation analyses further reveal the excellent cytocompatibility of both non- and covalently cross-linked SELP-47K films. The combination of high optical transparency and cytocompatibility of SELP-47K films, together with their previously reported outstanding mechanical properties, suggests that this protein polymer may be useful in unique, new biomedical applications.
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Affiliation(s)
- Weibing Teng
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, United States
| | - Yiding Huang
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, United States
| | - Joseph Cappello
- Protein Polymer Technologies, Inc., San Diego, California 92121, United States
| | - Xiaoyi Wu
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, United States
- Biomedical Engineering Program & Bio5 Institute, University of Arizona, Tucson, Arizona 85721, United States
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