1
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Juković M, Ratkaj I, Kalafatovic D, Bradshaw NJ. Amyloids, amorphous aggregates and assemblies of peptides - Assessing aggregation. Biophys Chem 2024; 308:107202. [PMID: 38382283 DOI: 10.1016/j.bpc.2024.107202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 01/31/2024] [Accepted: 02/14/2024] [Indexed: 02/23/2024]
Abstract
Amyloid and amorphous aggregates represent the two major categories of aggregates associated with diseases, and although exhibiting distinct features, researchers often treat them as equivalent, which demonstrates the need for more thorough characterization. Here, we compare amyloid and amorphous aggregates based on their biochemical properties, kinetics, and morphological features. To further decipher this issue, we propose the use of peptide self-assemblies as minimalistic models for understanding the aggregation process. Peptide building blocks are significantly smaller than proteins that participate in aggregation, however, they make a plausible means to bridge the gap in discerning the aggregation process at the more complex, protein level. Additionally, we explore the potential use of peptide-inspired models to research the liquid-liquid phase separation as a feasible mechanism preceding amyloid formation. Connecting these concepts can help clarify our understanding of aggregation-related disorders and potentially provide novel drug targets to impede and reverse these serious illnesses.
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Affiliation(s)
- Maja Juković
- Faculty of Biotechnology and Drug Development, University of Rijeka, 51000 Rijeka, Croatia
| | - Ivana Ratkaj
- Faculty of Biotechnology and Drug Development, University of Rijeka, 51000 Rijeka, Croatia
| | - Daniela Kalafatovic
- Faculty of Biotechnology and Drug Development, University of Rijeka, 51000 Rijeka, Croatia.
| | - Nicholas J Bradshaw
- Faculty of Biotechnology and Drug Development, University of Rijeka, 51000 Rijeka, Croatia.
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2
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Kaygisiz K, Rauch-Wirth L, Iscen A, Hartenfels J, Kremer K, Münch J, Synatschke CV, Weil T. Peptide Amphiphiles as Biodegradable Adjuvants for Efficient Retroviral Gene Delivery. Adv Healthc Mater 2024; 13:e2301364. [PMID: 37947246 DOI: 10.1002/adhm.202301364] [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: 04/28/2023] [Revised: 10/20/2023] [Indexed: 11/12/2023]
Abstract
Retroviral gene delivery is the key technique for in vitro and ex vivo gene therapy. However, inefficient virion-cell attachment resulting in low gene transduction efficacy remains a major challenge in clinical applications. Adjuvants for ex vivo therapy settings need to increase transduction efficiency while being easily removed or degraded post-transduction to prevent the risk of venous embolism after infusing the transduced cells back to the bloodstream of patients, yet no such peptide system have been reported thus far. In this study, peptide amphiphiles (PAs) with a hydrophobic fatty acid and a hydrophilic peptide moiety that reveal enhanced viral transduction efficiency are introduced. The PAs form β-sheet-rich fibrils that assemble into positively charged aggregates, promoting virus adhesion to the cell membrane. The block-type amphiphilic sequence arrangement in the PAs ensures efficient cell-virus interaction and biodegradability. Good biodegradability is observed for fibrils forming small aggregates and it is shown that via molecular dynamics simulations, the fibril-fibril interactions of PAs are governed by fibril surface hydrophobicity. These findings establish PAs as additives in retroviral gene transfer, rivalling commercially available transduction enhancers in efficiency and degradability with promising translational options in clinical gene therapy applications.
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Affiliation(s)
- Kübra Kaygisiz
- Department Synthesis of Macromolecules, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Lena Rauch-Wirth
- Institute of Molecular Virology, Ulm University Medical Center, Meyerhofstraße 1, 89081, Ulm, Germany
| | - Aysenur Iscen
- Polymer Theory Department, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Jan Hartenfels
- Department Synthesis of Macromolecules, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Kurt Kremer
- Polymer Theory Department, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Jan Münch
- Institute of Molecular Virology, Ulm University Medical Center, Meyerhofstraße 1, 89081, Ulm, Germany
| | - Christopher V Synatschke
- Department Synthesis of Macromolecules, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Tanja Weil
- Department Synthesis of Macromolecules, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
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3
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Ma L, Niu M, Ji Y, Liu L, Gu X, Luo J, Wei G, Yan M. Development of KLA-RGD integrated lipopeptide with the effect of penetrating membrane which target the α vβ 3 receptor and the application of combined antitumor. Colloids Surf B Biointerfaces 2023; 223:113186. [PMID: 36746066 DOI: 10.1016/j.colsurfb.2023.113186] [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: 10/25/2022] [Revised: 01/23/2023] [Accepted: 01/30/2023] [Indexed: 02/04/2023]
Abstract
Herein, an amphiphilic cationic anticancer lipopeptide P17 with α-helical structure was synthesized based on the integration of KLA and RGD peptide which could bind with the receptor of integrin αvβ3. P17 could self assemble into stable spherical aggregates in aqueous solution, and which could encapsulate the anticancer drugs (Such as Dox) to form P17 @ Anticancer drug nanomedicine (P17 @ Dox nanomedicine) which could play the combined therapy of P17 and anticancer drugs (Dox). The encapsulation efficiency of P17 aggregates to Dox was 80.4 ± 3.2 %, and the release behavior of P17 @ Dox nanomedicine in vitro had the characteristics of slow-release and pH responsiveness. The experiments in vitro showed that P17 lipopeptide had low cytotoxicity, high serum stability, low hemolysis and strong penetrating membrane ability. The release of Dox from P17 @ Dox in cells was time-dependment, and the P17 @ Dox nanomedicine had a good anticancer effect. The experiments in vivo showed that P17 and P17 @ Dox nanomedicine both had low hemolysis, and P17 @ Dox nanomedicine could effectively inhibit tumor growth and significantly reduce the toxic and side effects of Dox. Molecular docking experiments showed that P17 could effectively interact with the receptor of integrin αvβ3. In conclusion, P17 lipopeptide could be used as an excellent drug carrier and play the combined anticancer effect of P17 and anticancer drugs.
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Affiliation(s)
- Linhao Ma
- Department of Pharmacy Science, Binzhou Medical University, Yantai 264003,China
| | - Mingcong Niu
- Department of Pharmacy Science, Binzhou Medical University, Yantai 264003,China
| | - Yiping Ji
- Department of Pharmacy Science, Binzhou Medical University, Yantai 264003,China
| | - Lu Liu
- Department of Pharmacy Science, Binzhou Medical University, Yantai 264003,China
| | - XiuLian Gu
- Department of Pharmacy Science, Binzhou Medical University, Yantai 264003,China
| | - Junlin Luo
- Department of Pharmacy Science, Binzhou Medical University, Yantai 264003,China
| | - Guangcheng Wei
- Department of Pharmacy Science, Binzhou Medical University, Yantai 264003,China.
| | - Miaomiao Yan
- Department of Pharmacy Science, Binzhou Medical University, Yantai 264003,China.
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4
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Nap RJ, Qiao B, Palmer LC, Stupp SI, Olvera de la Cruz M, Szleifer I. Acid-Base Equilibrium and Dielectric Environment Regulate Charge in Supramolecular Nanofibers. Front Chem 2022; 10:852164. [PMID: 35372273 PMCID: PMC8965714 DOI: 10.3389/fchem.2022.852164] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 02/02/2022] [Indexed: 11/13/2022] Open
Abstract
Peptide amphiphiles are a class of molecules that can self-assemble into a variety of supramolecular structures, including high-aspect-ratio nanofibers. It is challenging to model and predict the charges in these supramolecular nanofibers because the ionization state of the peptides are not fixed but liable to change due to the acid-base equilibrium that is coupled to the structural organization of the peptide amphiphile molecules. Here, we have developed a theoretical model to describe and predict the amount of charge found on self-assembled peptide amphiphiles as a function of pH and ion concentration. In particular, we computed the amount of charge of peptide amphiphiles nanofibers with the sequence C16 − V2A2E2. In our theoretical formulation, we consider charge regulation of the carboxylic acid groups, which involves the acid-base chemical equilibrium of the glutamic acid residues and the possibility of ion condensation. The charge regulation is coupled with the local dielectric environment by allowing for a varying dielectric constant that also includes a position-dependent electrostatic solvation energy for the charged species. We find that the charges on the glutamic acid residues of the peptide amphiphile nanofiber are much lower than the same functional group in aqueous solution. There is a strong coupling between the charging via the acid-base equilibrium and the local dielectric environment. Our model predicts a much lower degree of deprotonation for a position-dependent relative dielectric constant compared to a constant dielectric background. Furthermore, the shape and size of the electrostatic potential as well as the counterion distribution are quantitatively and qualitatively different. These results indicate that an accurate model of peptide amphiphile self-assembly must take into account charge regulation of acidic groups through acid–base equilibria and ion condensation, as well as coupling to the local dielectric environment.
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Affiliation(s)
- Rikkert J. Nap
- Department of Biomedical Engineering, Northwestern University, Evanston, IL, United States
- Chemistry of Life Processes Institute, Northwestern University, Evanston, IL, United States
- *Correspondence: Rikkert J. Nap, ; Igal Szleifer,
| | - Baofu Qiao
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, United States
| | - Liam C. Palmer
- Simpson Querrey Institute for BioNanotechnology, Northwestern University, Chicago, IL, United States
- Department of Chemistry, Northwestern University, Evanston, IL, United States
| | - Samuel I. Stupp
- Department of Biomedical Engineering, Northwestern University, Evanston, IL, United States
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, United States
- Simpson Querrey Institute for BioNanotechnology, Northwestern University, Chicago, IL, United States
- Department of Chemistry, Northwestern University, Evanston, IL, United States
- Department of Medicine, Northwestern University, Chicago, IL, United States
| | - Monica Olvera de la Cruz
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, United States
- Department of Chemistry, Northwestern University, Evanston, IL, United States
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL, United States
- Department of Physics and Astronomy, Northwestern University, Evanston, IL, United States
- Center for Computation and Theory of Soft Materials, Northwestern University, Evanston, IL, United States
| | - Igal Szleifer
- Department of Biomedical Engineering, Northwestern University, Evanston, IL, United States
- Chemistry of Life Processes Institute, Northwestern University, Evanston, IL, United States
- Department of Chemistry, Northwestern University, Evanston, IL, United States
- *Correspondence: Rikkert J. Nap, ; Igal Szleifer,
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5
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Pal VK, Roy S. Cooperative Metal Ion Coordination to the Short Self-Assembling Peptide Promotes Hydrogelation and Cellular Proliferation. Macromol Biosci 2022; 22:e2100462. [PMID: 35257490 DOI: 10.1002/mabi.202100462] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 02/14/2022] [Indexed: 11/12/2022]
Abstract
Non-covalent interactions among short peptides and proteins led to their molecular self-assembly into supramolecular packaging, which provides the fundamental basis of life. These biomolecular assemblies are highly susceptible to the environmental conditions, including temperature, light, pH, and ionic concentration, thus inspiring the fabrication of a new class of stimuli-responsive biomaterials. Here, we report for the first time the cooperative effect of the divalent metal ions to promote hydrogelation in the short collagen inspired self-assembling peptide for developing advanced biomaterials. Introduction of the biologically relevant metal ions (Ca2+ /Mg2+ ) to the peptide surpasses its limitation to self-assemble into a multi-scale structure at physiological pH. In particular, in presence of metal ions, the negatively charged peptide showed a distinct shift in its equilibrium point of gelation and demonstrated conversion from sol to gel and thus enabling the scope of fabricating an advanced biomaterial for controlling cellular behaviour. Interestingly, tunable mechanical strength and improved cellular response were observed within ion-coordinated peptide hydrogels compared to the peptide gelator. Microscopic analyses, rheological assessment, and biological studies established the importance of utilizing a novel strategy by simply using metal ions to modulate the physical and biological attributes of CIPs to construct next-generation biomaterials. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Vijay Kumar Pal
- Institute of Nano Science and Technology, Sector 81, Knowledge City, Sahibzada Ajit Singh Nagar, Punjab, Pin-140306
| | - Sangita Roy
- Institute of Nano Science and Technology, Sector 81, Knowledge City, Sahibzada Ajit Singh Nagar, Punjab, Pin-140306
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6
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Panja S, Seddon A, Adams DJ. Controlling hydrogel properties by tuning non-covalent interactions in a charge complementary multicomponent system. Chem Sci 2021; 12:11197-11203. [PMID: 34522317 PMCID: PMC8386653 DOI: 10.1039/d1sc02854e] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 07/22/2021] [Indexed: 12/29/2022] Open
Abstract
Mixing small molecule gelators is a promising route to prepare useful and exciting materials that cannot be accessed from any of the individual components. Here, we describe pH-triggered hydrogelation by mixing of two non-gelling amphiphiles. The intermolecular interactions among the molecules can be tuned either by controlling the degree of ionization of the components or by a preparative pathway, which enables us to control material properties such as gel strength, gel stiffness, thermal stability, and an unusual shrinking/swelling behaviour.
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Affiliation(s)
- Santanu Panja
- School of Chemistry, University of Glasgow Glasgow G12 8QQ UK
| | - Annela Seddon
- School of Physics, HH Wills Physics Laboratory, University of Bristol Tyndall Avenue Bristol BS8 1TL UK
- Bristol Centre for Functional Nanomaterials, HH Wills Physics Laboratory, University of Bristol Tyndall Avenue Bristol BS8 1TL UK
| | - Dave J Adams
- School of Chemistry, University of Glasgow Glasgow G12 8QQ UK
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7
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Xing H, Chin SM, Udumula VR, Krishnaiah M, Rodrigues de Almeida N, Huck-Iriart C, Picco AS, Lee SR, Zaldivar G, Jackson KA, Tagliazucchi M, Stupp SI, Conda-Sheridan M. Control of Peptide Amphiphile Supramolecular Nanostructures by Isosteric Replacements. Biomacromolecules 2021; 22:3274-3283. [PMID: 34291897 DOI: 10.1021/acs.biomac.1c00379] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Supramolecular nanostructures with tunable properties can have applications in medicine, pharmacy, and biotechnology. In this work, we show that the self-assembly behavior of peptide amphiphiles (PAs) can be effectively tuned by replacing the carboxylic acids exposed to the aqueous media with isosteres, functionalities that share key physical or chemical properties with another chemical group. Transmission electron microscopy, atomic force microscopy, and small-angle X-ray scattering studies indicated that the nanostructure's morphologies are responsive to the ionization states of the side chains, which are related to their pKa values. Circular dichroism studies revealed the effect of the isosteres on the internal arrangement of the nanostructures. The interactions between diverse surfaces and the nanostructures and the effect of salt concentration and temperature were assessed to further understand the properties of these self-assembled systems. These results indicate that isosteric replacements allow the pH control of supramolecular morphology by manipulating the pKa of the charged groups located on the nanostructure's surface. Theoretical studies were performed to understand the morphological transitions that the nanostructures underwent in response to pH changes, suggesting that the transitions result from alterations in the Coulomb forces between PA molecules. This work provides a strategy for designing biomaterials that can maintain or change behaviors based on the pH differences found within cells and tissues.
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Affiliation(s)
- Huihua Xing
- College of Pharmacy, University of Nebraska Medical Center, Omaha, Nebraska 68105, United States
| | - Stacey M Chin
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Venkata Reddy Udumula
- College of Pharmacy, University of Nebraska Medical Center, Omaha, Nebraska 68105, United States
| | - Maddeboina Krishnaiah
- College of Pharmacy, University of Nebraska Medical Center, Omaha, Nebraska 68105, United States
| | | | - Cristián Huck-Iriart
- Laboratorio de Cristalografía Aplicada, Escuela de Ciencia y Tecnología, Universidad Nacional de General San Martín, B1650 San Martín, Buenos Aires, Argentina
| | - Agustín S Picco
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) - Universidad Nacional de La Plata (UNLP) - CONICET, 1900, La Plata, Argentina
| | - Sieun Ruth Lee
- Department of Materials Science & Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Gervasio Zaldivar
- INQUIMAE-CONICET and DQIAQF, Universidad de Buenos Aires, Facultad de Ciencias, Ciudad Universitaria, C1428 Ciudad de Buenos Aires, Argentina
| | - Kelsey A Jackson
- College of Arts and Sciences, Creighton University, Omaha, Nebraska 68178, United States
| | - Mario Tagliazucchi
- INQUIMAE-CONICET and DQIAQF, Universidad de Buenos Aires, Facultad de Ciencias, Ciudad Universitaria, C1428 Ciudad de Buenos Aires, Argentina
| | - Samuel I Stupp
- Department of Materials Science & Engineering, Chemistry, Biomedical Engineering, Medicine, and Simpson Querrey Institute, Northwestern University, Evanston, Illinois 60208, United States
| | - Martin Conda-Sheridan
- College of Pharmacy, University of Nebraska Medical Center, Omaha, Nebraska 68105, United States
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8
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Li Q, Zhang G, Wu Y, Wang Y, Liang Y, Yang X, Qi W, Su R, He Z. Control of peptide hydrogel formation and stability via heating treatment. J Colloid Interface Sci 2021; 583:234-242. [PMID: 33002695 DOI: 10.1016/j.jcis.2020.09.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 09/09/2020] [Accepted: 09/10/2020] [Indexed: 10/23/2022]
Abstract
Heating treatment is widely used in the preparation of metallic materials with controlled phase behavior and mechanical properties. However, for the soft materials assembled by short peptides, especially simple dipeptides, the detailed influences of heating treatment on the structures and functions of the materials remain largely unexplored. Here we showed that by thermal annealing or quenching of aromatic peptide solutions under kinetic control, we are able to control the self-assembly of peptide into materials with distinct phase behavior and macroscopic properties. The thermal annealing of the heated peptide solutions will lead to the formation of large nanobelts or bundles in solution, and no gels will be formed. However, by quenching the heated peptide solution, a self-supporting hydrogel will be formed quickly. Structure analysis revealed that the peptides preferred to self-assembled into much thinner and flexible nanohelices during quenching treatment. Moreover, the stability of the gels further increased with the repeated heating and quenching cycling of the peptide solutions. The results demonstrated that the heat treatment can be used to control the structure and function of self-assembled materials in a way similar to that of the conventional metallic or alloy materials.
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Affiliation(s)
- Qing Li
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
| | - Gong Zhang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
| | - Yifei Wu
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
| | - Yuefei Wang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China; Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, PR China.
| | - Yaoyu Liang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
| | - Xin Yang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
| | - Wei Qi
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR China; Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, PR China
| | - Rongxin Su
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR China; Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, PR China
| | - Zhimin He
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
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9
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Asanarong O, Minh Quan V, Boonrungsiman S, Sukyai P. Bioactive wound dressing using bacterial cellulose loaded with papain composite: Morphology, loading/release and antibacterial properties. Eur Polym J 2021. [DOI: 10.1016/j.eurpolymj.2020.110224] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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10
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The Role of Counter-Ions in Peptides-An Overview. Pharmaceuticals (Basel) 2020; 13:ph13120442. [PMID: 33287352 PMCID: PMC7761850 DOI: 10.3390/ph13120442] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 11/29/2020] [Accepted: 12/01/2020] [Indexed: 12/16/2022] Open
Abstract
Peptides and proteins constitute a large group of molecules that play multiple functions in living organisms. In conjunction with their important role in biological processes and advances in chemical approaches of synthesis, the interest in peptide-based drugs is still growing. As the side chains of amino acids can be basic, acidic, or neutral, the peptide drugs often occur in the form of salts with different counter-ions. This review focuses on the role of counter-ions in peptides. To date, over 60 peptide-based drugs have been approved by the FDA. Based on their area of application, biological activity, and results of preliminary tests they are characterized by different counter-ions. Moreover, the impact of counter-ions on structure, physicochemical properties, and drug formulation is analyzed. Additionally, the application of salts as mobile phase additives in chromatographic analyses and analytical techniques is highlighted.
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11
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Seroski DT, Dong X, Wong KM, Liu R, Shao Q, Paravastu AK, Hall CK, Hudalla GA. Charge guides pathway selection in β-sheet fibrillizing peptide co-assembly. Commun Chem 2020; 3:172. [PMID: 36703436 PMCID: PMC9814569 DOI: 10.1038/s42004-020-00414-w] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Accepted: 10/15/2020] [Indexed: 01/29/2023] Open
Abstract
Peptide co-assembly is attractive for creating biomaterials with new forms and functions. Emergence of these properties depends on the peptide content of the final assembled structure, which is difficult to predict in multicomponent systems. Here using experiments and simulations we show that charge governs content by affecting propensity for self- and co-association in binary CATCH(+/-) peptide systems. Equimolar mixtures of CATCH(2+/2-), CATCH(4+/4-), and CATCH(6+/6-) formed two-component β-sheets. Solid-state NMR suggested the cationic peptide predominated in the final assemblies. The cationic-to-anionic peptide ratio decreased with increasing charge. CATCH(2+) formed β-sheets when alone, whereas the other peptides remained unassembled. Fibrillization rate increased with peptide charge. The zwitterionic CATCH parent peptide, "Q11", assembled slowly and only at decreased simulation temperature. These results demonstrate that increasing charge draws complementary peptides together faster, favoring co-assembly, while like-charged molecules repel. We foresee these insights enabling development of co-assembled peptide biomaterials with defined content and predictable properties.
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Affiliation(s)
- Dillon T Seroski
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, 32611, USA
| | - Xin Dong
- Department of Chemical and Biomolecular Engineering, North Carolina State University, 911 Partners Way, Raleigh, NC, 27695, USA
| | - Kong M Wong
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Renjie Liu
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, 32611, USA
| | - Qing Shao
- Department of Chemical and Biomolecular Engineering, North Carolina State University, 911 Partners Way, Raleigh, NC, 27695, USA
| | - Anant K Paravastu
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Carol K Hall
- Department of Chemical and Biomolecular Engineering, North Carolina State University, 911 Partners Way, Raleigh, NC, 27695, USA
| | - Gregory A Hudalla
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, 32611, USA.
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12
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Kaur H, Sharma P, Patel N, Pal VK, Roy S. Accessing Highly Tunable Nanostructured Hydrogels in a Short Ionic Complementary Peptide Sequence via pH Trigger. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:12107-12120. [PMID: 32988205 DOI: 10.1021/acs.langmuir.0c01472] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Creating diverse nanostructures from a single gelator through modulating the self-assembly pathway has been gaining much attention in recent years. To this direction, we are exploring the effect of modulation of pH as a potential self-assembly pathway in governing the physicochemical properties of the final gel phase material. In this context, we used a classical nongelator with the ionic complementary sequence FEFK, which was rationally conjugated to an aromatic group naphthoxyacetic acid (Nap) at the N-terminal end to tune its gelation behavior. Interestingly, the presence of oppositely charged amino acids in the peptide amphiphile resulted in pH-responsive behavior, leading to the formation of hydrogels over a wide pH range (2.0-12.0); however, their structures differ significantly at the nanoscale. Thus, by simply manipulating the overall charge over the exposed surface of the peptide amphiphiles as a function of pH, we were able to access diverse self-assembled nanostructures within a single gelator domain. The charged state of the gelator at the extreme pH (2.0, 12.0) led to a thinner fiber formation, in contrast to the thicker fibers observed near the physiological pH owing to charge neutralization, thus promoting the lateral association. Such variation in molecular packing was found to be further reflected in the variable mechanical strengths of the peptide hydrogels obtained at different pH values. Moreover, the gelation of the peptide at physiological pH offers an additional advantage to explore this hydrogel as a cell culture scaffold. We anticipate that our study on controlling the self-assembly pathway of the ionic complementary peptide amphiphile can be an elegant approach to access diverse self-assembled materials, which can expand the zone of its applicability as a stimuli-responsive biomaterial.
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Affiliation(s)
- Harsimran Kaur
- Habitat Centre, Institute of Nano Science and Technology, Sector 64, Phase 10, Mohali, Punjab 160062, India
| | - Pooja Sharma
- Habitat Centre, Institute of Nano Science and Technology, Sector 64, Phase 10, Mohali, Punjab 160062, India
| | - Nidhi Patel
- Habitat Centre, Institute of Nano Science and Technology, Sector 64, Phase 10, Mohali, Punjab 160062, India
| | - Vijay Kumar Pal
- Habitat Centre, Institute of Nano Science and Technology, Sector 64, Phase 10, Mohali, Punjab 160062, India
| | - Sangita Roy
- Habitat Centre, Institute of Nano Science and Technology, Sector 64, Phase 10, Mohali, Punjab 160062, India
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13
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Role of molecular chirality and solvents in directing the self-assembly of peptide into an ultra-pH-sensitive hydrogel. J Colloid Interface Sci 2020; 577:388-396. [DOI: 10.1016/j.jcis.2020.05.087] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 05/19/2020] [Accepted: 05/22/2020] [Indexed: 12/18/2022]
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14
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Abstract
Treatment strategies in clinics have been shifting from small molecules to protein drugs due to the promising results of a highly specific mechanism of action and reduced toxicity. Despite their prominent roles in disease treatment, delivery of the protein therapeutics is challenging due to chemical instability, immunogenicity and biological barriers. Peptide hydrogels with spatiotemporally tunable properties have shown an outstanding potential to deliver complex protein therapeutics, maintain drug efficacy and stability over time, mimicking the extracellular matrix, and responding to external stimuli. In this review, we present recent advances in peptide hydrogel design strategies, protein release kinetics and mechanisms for protein drug delivery in cellular engineering, tissue engineering, immunotherapy and disease treatments.
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15
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Pal VK, Jain R, Roy S. Tuning the Supramolecular Structure and Function of Collagen Mimetic Ionic Complementary Peptides via Electrostatic Interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:1003-1013. [PMID: 31865708 DOI: 10.1021/acs.langmuir.9b02941] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Collagen, the most abundant component of natural ECM, has attracted interest of scientific communities to replicate its multihierarchical self-assembling structure. Recent developments in collagen mimetic peptides were inclined toward the production of self-assembling short peptides capable of mimicking complex higher order structures with tunable mechanical properties. Here, we report for the first time, the crucial molecular design of oppositely charged collagen mimetic shortest bioactive pentapeptide sequences, as a minimalistic building block for development of next-generation biomaterials. Our rational design involves synthesis of two pentapeptides, where the fundamental molecular motif of collagen, that is, Gly-X-Y has been mutated at the central position with positively charged, lysine, and negatively charged, aspartate, residues. Depending on their overall surface charge, these peptides showed high propensity to form self-supporting hydrogel either at acidic or basic pH, which limits their biomedical applications. Interestingly, simple mixing of the two peptides was found to induce the coassembly of these designed peptides, which drives the formation of self-supporting hydrogel at physiological pH and thus enhanced the potential of exploring these peptides for biomedical purposes. This coassembly of ionic peptides was accompanied by the enhancement in the mechanical stiffness of the gels and reduction in overall zeta potential of the combined hydrogel, which provides the evidence for additional electrostatic interactions. Furthermore, the thixotropic nature of these gels offers an additional advantage of exploration of designer biomaterials as injectable gels. The nanofibers of coassembled hydrogel were found to be highly biocompatible to the fibroblast cells compared to the individual peptides, which was evident from their cytotoxicity studies. We anticipate that our rational design of ECM protein mimics in the form of short bioactive peptides will contribute significantly to the development of novel biomaterials and play a crucial role in the field of tissue engineering and regenerative medicines.
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Affiliation(s)
- Vijay Kumar Pal
- Institute of Nano Science and Technology , Habitat Centre, Sector 64, Phase 10 , Mohali , Punjab 160062 , India
| | - Rashmi Jain
- Institute of Nano Science and Technology , Habitat Centre, Sector 64, Phase 10 , Mohali , Punjab 160062 , India
| | - Sangita Roy
- Institute of Nano Science and Technology , Habitat Centre, Sector 64, Phase 10 , Mohali , Punjab 160062 , India
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16
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Jian H, Wang M, Dong Q, Li J, Wang A, Li X, Ren P, Bai S. Dipeptide Self-Assembled Hydrogels with Tunable Mechanical Properties and Degradability for 3D Bioprinting. ACS APPLIED MATERIALS & INTERFACES 2019; 11:46419-46426. [PMID: 31769283 DOI: 10.1021/acsami.9b13905] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Supramolecular hydrogels self-assembled from short peptides have shown great potential as biomimetic extracellular matrices with controllable properties designed at the molecular level. However, their weak mechanical strength still remains a big challenge for 3D bioprinting. Herein, two oppositely charged dipeptides are designed and used as bioinks in a ″layer-by-layer″ alternative bioprinting strategy. During printing, in situ gelation is achieved by electrostatic interactions between two dipeptides without additional cross-linking procedures. The binary hydrogels have tunable mechanical properties with elastic moduli ranging from 4 to 62 kPa and controllable biodegradability from days to weeks, which can ideally mimic the natural environment of a variety of cell types. It is demonstrated that the hydrogel scaffold enables the formation, growth, and natural release of HepaRG spheroids with sizes up to millimeters. This strategy may be suitable to develop a series of new bioink materials based on peptides and other supramolecular polymers for 3D bioprinting.
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Affiliation(s)
- Honglei Jian
- State Key Laboratory of Biochemical Engineering , Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190 , China
| | - Meiyue Wang
- State Key Laboratory of Biochemical Engineering , Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190 , China
| | - Qianqian Dong
- State Key Laboratory of Biochemical Engineering , Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190 , China
| | - Jieling Li
- State Key Laboratory of Biochemical Engineering , Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190 , China
| | - Anhe Wang
- State Key Laboratory of Biochemical Engineering , Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190 , China
| | - Xin Li
- State Key Laboratory of Biochemical Engineering , Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190 , China
| | - Peng Ren
- State Key Laboratory of Biochemical Engineering , Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190 , China
| | - Shuo Bai
- State Key Laboratory of Biochemical Engineering , Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190 , China
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences , Beijing 100101 , China
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17
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Martin AD, Wojciechowski JP, Du EY, Rawal A, Stefen H, Au CG, Hou L, Cranfield CG, Fath T, Ittner LM, Thordarson P. Decoupling the effects of hydrophilic and hydrophobic moieties at the neuron-nanofibre interface. Chem Sci 2019; 11:1375-1382. [PMID: 34123262 PMCID: PMC8148083 DOI: 10.1039/c9sc05686f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Peptide-based nanofibres are a versatile class of tunable materials with applications in optoelectronics, sensing and tissue engineering. However, the understanding of the nanofibre surface at the molecular level is limited. Here, a series of homologous dilysine–diphenylalnine tetrapeptides were synthesised and shown to self-assemble into water-soluble nanofibres. Despite the peptide nanofibres displaying similar morphologies, as evaluated through atomic force microscopy and neutron scattering, significant differences were observed in their ability to support sensitive primary neurons. Contact angle and labelling experiments revealed that differential presentation of lysine moieties at the fibre surface did not affect neuronal viability; however the mobility of phenylalanine residues at the nanofibre surface, elucidated through solid- and gel-state NMR studies and confirmed through tethered bilayer lipid membrane experiments, was found to be the determining factor in governing the suitability of a given peptide as a scaffold for primary neurons. This work offers new insights into characterising and controlling the nanofibre surface at the molecular level. The mobility of hydrophobic moieties at a peptide nanofibre surface determines its suitability as a scaffold for sensitive primary cells.![]()
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Affiliation(s)
- Adam D Martin
- Dementia Research Centre, Department of Biomedical Science, Faculty of Medicine and Health Sciences, Macquarie University Sydney NSW 2109 Australia
| | | | - Eric Y Du
- School of Chemistry, The Australian Centre for Nanomedicine, The ARC Centre of Excellence in Convergent Bio-Nano Science & Technology, University of New South Wales Sydney NSW 2052 Australia
| | - Aditya Rawal
- NMR Facility, Mark Wainwright Analytical Centre, The University of New South Wales Sydney 2052 New South Wales Australia
| | - Holly Stefen
- Dementia Research Centre, Department of Biomedical Science, Faculty of Medicine and Health Sciences, Macquarie University Sydney NSW 2109 Australia
| | - Carol G Au
- Dementia Research Centre, Department of Biomedical Science, Faculty of Medicine and Health Sciences, Macquarie University Sydney NSW 2109 Australia
| | - Liming Hou
- Dementia Research Centre, Department of Biomedical Science, Faculty of Medicine and Health Sciences, Macquarie University Sydney NSW 2109 Australia
| | - Charles G Cranfield
- School of Life Sciences, University of Technology Sydney Ultimo NSW 2007 Australia
| | - Thomas Fath
- Dementia Research Centre, Department of Biomedical Science, Faculty of Medicine and Health Sciences, Macquarie University Sydney NSW 2109 Australia
| | - Lars M Ittner
- Dementia Research Centre, Department of Biomedical Science, Faculty of Medicine and Health Sciences, Macquarie University Sydney NSW 2109 Australia
| | - Pall Thordarson
- School of Chemistry, The Australian Centre for Nanomedicine, The ARC Centre of Excellence in Convergent Bio-Nano Science & Technology, University of New South Wales Sydney NSW 2052 Australia
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18
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Dana A, Tekinay AB, Tekin ED. A comparison of peptide amphiphile nanofiber macromolecular assembly strategies. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2019; 42:63. [PMID: 31115713 DOI: 10.1140/epje/i2019-11827-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 04/15/2019] [Indexed: 06/09/2023]
Abstract
Supramolecular peptide nanofibers that are composed of peptide amphiphile molecules have been widely used for many purposes from biomedical applications to energy conversion. The self-assembly mechanisms of these peptide nanofibers also provide convenient models for understanding the self-assembly mechanisms of various biological supramolecular systems; however, the current theoretical models that explain these mechanisms do not sufficiently explain the experimental results. In this study, we present a new way of modeling these nanofibers that better fits with the experimental data. Molecular dynamics simulations were applied to create model fibers using two different layer models and two different tilt angles. Strikingly, the fibers which were modeled to be tilting the peptide amphiphile molecules and/or tilting the plane were found to be more stable and consistent with the experiments.
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Affiliation(s)
- Aykutlu Dana
- Spilker Engineering & Applied Sciences, Stanford University, 94305, Stanford, CA, USA
| | - Ayse B Tekinay
- Eryigit Medical Devices, Research and Development Center, 06378, Ankara, Turkey
| | - E Deniz Tekin
- Faculty of Engineering, University of Turkish Aeronautical Association, 06790, Ankara, Turkey.
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19
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20
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Seyedkarimi MS, Mirzadeh H, Bagheri-Khoulenjani S. On the analysis of microrheological responses of self-assembling RADA16-I peptide hydrogel. J Biomed Mater Res A 2018; 107:330-338. [PMID: 30417542 DOI: 10.1002/jbm.a.36495] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Accepted: 06/18/2018] [Indexed: 11/06/2022]
Abstract
This work aims to obtain a hydrogel based on self-assembling RADA16-I with proper rheological properties for hemostasis application. Response surface methodology (RSM) was performed to predict the gelation and stiffness of the hydrogel in different concentrations of peptide and NaCl in water and blood serum milieus. Particle tracking microrheology technique was used to evaluate Brownian motion of polystyrene particles in the peptide solutions to obtain their trajectories and measure the viscoelastic properties (G'', G″, and tan δ). Formation of gel was influenced by the concentrations of peptide and salt and their interactions. Optimum response for maximizing elastic modulus was obtained in the presence of blood serum in comparison with water. Negative effect of excess amount of NaCl was predicted by RSM model and confirmed by animal study. Circular dichroism (CD) analysis showed formation of β-sheet secondary structure in water. On the other hand, in the presence of blood serum, tertiary structure was formed. Dimensional characterization of peptide fibers was performed by means of AFM. Peptide self-assembly in blood serum (pH around 7) which contains different ions, led to enhancing bonds between fibers, caused increasing the fiber diameter and length by 20 and 10 times, respectively. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 107A: 330-338, 2019.
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Affiliation(s)
- Mansooreh-Sadat Seyedkarimi
- Polymer and Color Engineering Department, Amirkabir University of Technology, Tehran, Iran.,Bioscience and Biotechnology Department, Malek-Ashtar University of Technology, Tehran, Iran
| | - Hamid Mirzadeh
- Polymer and Color Engineering Department, Amirkabir University of Technology, Tehran, Iran
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21
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Okur Z, Senturk OI, Yilmaz C, Gulseren G, Mammadov B, Guler MO, Tekinay AB. Promotion of neurite outgrowth by rationally designed NGF-β binding peptide nanofibers. Biomater Sci 2018; 6:1777-1790. [PMID: 29770392 DOI: 10.1039/c8bm00311d] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Promotion of neurite outgrowth is an important limiting step for regeneration in nerve injury and depends strongly on the local expression of nerve growth factor (NGF). The rational design of bioactive materials is a promising approach for the development of novel therapeutic methods for nerve regeneration, and biomaterials capable of presenting NGF to nerve cells are especially suitable for this purpose. In this study, we show bioactive peptide amphiphile (PA) nanofibers capable of promoting neurite outgrowth by displaying high density binding epitopes for NGF. A high-affinity NGF-binding sequence was identified by phage display and combined with a beta-sheet forming motif to produce a self-assembling PA molecule. The bioactive nanofiber had higher affinity for NGF compared to control nanofibers and in vitro studies revealed that the NGF binding peptide amphiphile nanofibers (NGFB-PA nanofiber) significantly promote the neurite outgrowth of PC-12 cells. In addition, the nanofibers induced differentiation of PC-12 cells into neuron-like cells by enhancing NGF/high-activity NGF receptor (TrkA) interactions and activating MAPK pathway elements. The NGFB-PA nanofiber was further shown as a promising material to support axonal outgrowth from primary sensory neurons. These materials will pave the way for the development of new therapeutic agents for peripheral nervous system injuries.
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Affiliation(s)
- Zeynep Okur
- Institute of Materials Science and Nanotechnology and National Nanotechnology Research Center (UNAM), Bilkent University, Ankara, 06800, Turkey.
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22
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Wu R, Liu J, Qiu X, Deng M. Molecular dynamics simulation of the nanofibrils formed by amyloid-based peptide amphiphiles. MOLECULAR SIMULATION 2017. [DOI: 10.1080/08927022.2017.1321758] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Rongliang Wu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai, P.R. China
| | - Jun Liu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai, P.R. China
| | - Xinlong Qiu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai, P.R. China
| | - Manli Deng
- Key Laboratory of Colloid and Interface Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, P.R. China
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23
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Caliskan OS, Sardan Ekiz M, Tekinay AB, Guler MO. Spatial Organization of Functional Groups on Bioactive Supramolecular Glycopeptide Nanofibers for Differentiation of Mesenchymal Stem Cells (MSCs) to Brown Adipogenesis. Bioconjug Chem 2016; 28:740-750. [DOI: 10.1021/acs.bioconjchem.6b00632] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Ozum S. Caliskan
- Institute of Materials Science
and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, 06800 Ankara, Turkey
| | - Melis Sardan Ekiz
- Institute of Materials Science
and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, 06800 Ankara, Turkey
| | - Ayse B. Tekinay
- Institute of Materials Science
and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, 06800 Ankara, Turkey
| | - Mustafa O. Guler
- Institute of Materials Science
and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, 06800 Ankara, Turkey
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24
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Ekiz MS, Cinar G, Khalily MA, Guler MO. Self-assembled peptide nanostructures for functional materials. NANOTECHNOLOGY 2016; 27:402002. [PMID: 27578525 DOI: 10.1088/0957-4484/27/40/402002] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Nature is an important inspirational source for scientists, and presents complex and elegant examples of adaptive and intelligent systems created by self-assembly. Significant effort has been devoted to understanding these sophisticated systems. The self-assembly process enables us to create supramolecular nanostructures with high order and complexity, and peptide-based self-assembling building blocks can serve as suitable platforms to construct nanostructures showing diverse features and applications. In this review, peptide-based supramolecular assemblies will be discussed in terms of their synthesis, design, characterization and application. Peptide nanostructures are categorized based on their chemical and physical properties and will be examined by rationalizing the influence of peptide design on the resulting morphology and the methods employed to characterize these high order complex systems. Moreover, the application of self-assembled peptide nanomaterials as functional materials in information technologies and environmental sciences will be reviewed by providing examples from recently published high-impact studies.
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Affiliation(s)
- Melis Sardan Ekiz
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara, 06800 Turkey
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25
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Shen J, Xin X, Liu T, Wang S, Yang Y, Luan X, Xu G, Yuan S. Ionic Self-Assembly of a Giant Vesicle as a Smart Microcarrier and Microreactor. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:9548-9556. [PMID: 27564979 DOI: 10.1021/acs.langmuir.6b01829] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Giant vesicles (1-10 μm) were constructed via a facile ionic self-assembly (ISA) strategy using an anionic dye Acid Orange II (AO) and an oppositely charged ionic-liquid-type cationic surfactant 1-tetradecyl-3-methylimidazolium bromide (C14mimBr). This is the first report about preparing giant vesicles through ISA strategy. Interestingly, the giant vesicle could keep the original morphology during the evaporation of solvent and displayed solid-like properties at low concentration. Moreover, giant vesicles with large internal capacity volume and good stability in solution could also be achieved by increasing the concentrations of AO and C14mimBr which contributed to the increase of the other noncovalent cooperative interactions. In order to facilitate comparison, a series of parallel experiments with similar materials were carried out to investigate and verify the driving forces for the formation of these kinds of giant vesicles by changing the hydrophobic moieties or the head groups of the surfactants. It is concluded that the electrostatic interaction, hydrophobic effect and π-π stacking interaction play key roles in this self-assembly process. Importantly, the giant vesicles can act as a smart microcarrier to load and release carbon quantum dot (CQD) under control. Besides, the giant vesicles could also be applied as a microrector to synthesize monodispersed Ag nanoparticles with diameter of about 5-10 nm which exhibited the ability to catalyze reduction of 4-nitroaniline. Therefore, it is indicated that our AO/C14mimBr assemblies hold promising applications in the areas of microencapsulation, catalyst support, and lightweight composites owing to their huge sizes and large microcavities.
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Affiliation(s)
- Jinglin Shen
- Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education , Shanda nanlu No. 27, Jinan, 250100, People's Republic of China
| | - Xia Xin
- Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education , Shanda nanlu No. 27, Jinan, 250100, People's Republic of China
- National Engineering Technology Research Center for Colloidal Materials, Shandong University , Shanda nanlu No. 27, Jinan, 250100, People's Republic of China
| | - Teng Liu
- Institute of Materia Medica, Shandong Academy of Medical Sciences , Jinan 250062, People's Republic of China
| | - Shubin Wang
- Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education , Shanda nanlu No. 27, Jinan, 250100, People's Republic of China
| | - Yingjie Yang
- Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education , Shanda nanlu No. 27, Jinan, 250100, People's Republic of China
| | - Xiaoyu Luan
- Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education , Shanda nanlu No. 27, Jinan, 250100, People's Republic of China
| | - Guiying Xu
- Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education , Shanda nanlu No. 27, Jinan, 250100, People's Republic of China
- National Engineering Technology Research Center for Colloidal Materials, Shandong University , Shanda nanlu No. 27, Jinan, 250100, People's Republic of China
| | - Shiling Yuan
- Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education , Shanda nanlu No. 27, Jinan, 250100, People's Republic of China
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26
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Thota CK, Yadav N, Chauhan VS. "A novel highly stable and injectable hydrogel based on a conformationally restricted ultrashort peptide". Sci Rep 2016; 6:31167. [PMID: 27507432 PMCID: PMC4979021 DOI: 10.1038/srep31167] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 07/13/2016] [Indexed: 11/09/2022] Open
Abstract
Nanostructures including hydrogels based on peptides containing non protein amino acids are being considered as platform for drug delivery because of their inherent biocompatibility and additional proteolytic stability. Here we describe instantaneous self-assembly of a conformationally restricted dipeptide, LeuΔPhe, containing an α,β-dehydrophenylalanine residue into a highly stable and mechanically strong hydrogel, under mild physiological aqueous conditions. The gel successfully entrapped several hydrophobic and hydrophilic drug molecules and released them in a controlled manner. LeuΔPhe was highly biocompatible and easily injectable. Administration of an antineoplastic drug entrapped in the gel in tumor bearing mice significantly controlled growth of tumors. These characteristics make LeuΔPhe an attractive candidate for further development as a delivery platform for various biomedical applications.
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Affiliation(s)
- Chaitanya Kumar Thota
- International Centre for Genetic Engineering &Biotechnology Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Nitin Yadav
- International Centre for Genetic Engineering &Biotechnology Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Virander Singh Chauhan
- International Centre for Genetic Engineering &Biotechnology Aruna Asaf Ali Marg, New Delhi-110067, India
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27
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Arslan E, Guler MO, Tekinay AB. Glycosaminoglycan-Mimetic Signals Direct the Osteo/Chondrogenic Differentiation of Mesenchymal Stem Cells in a Three-Dimensional Peptide Nanofiber Extracellular Matrix Mimetic Environment. Biomacromolecules 2016; 17:1280-91. [PMID: 26840042 DOI: 10.1021/acs.biomac.5b01637] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Recent efforts in bioactive scaffold development focus strongly on the elucidation of complex cellular responses through the use of synthetic systems. Designing synthetic extracellular matrix (ECM) materials must be based on understanding of cellular behaviors upon interaction with natural and artificial scaffolds. Hence, due to their ability to mimic both the biochemical and mechanical properties of the native tissue environment, supramolecular assemblies of bioactive peptide nanostructures are especially promising for development of bioactive ECM-mimetic scaffolds. In this study, we used glycosaminoglycan (GAG) mimetic peptide nanofiber gel as a three-dimensional (3D) platform to investigate how cell lineage commitment is altered by external factors. We observed that amount of fetal bovine serum (FBS) presented in the cell media had synergistic effects on the ability of GAG-mimetic nanofiber gel to mediate the differentiation of mesenchymal stem cells into osteogenic and chondrogenic lineages. In particular, lower FBS concentration in the culture medium was observed to enhance osteogenic differentiation while higher amount FBS promotes chondrogenic differentiation in tandem with the effects of the GAG-mimetic 3D peptide nanofiber network, even in the absence of externally administered growth factors. We therefore demonstrate that mesenchymal stem cell differentiation can be specifically controlled by the combined influence of growth medium components and a 3D peptide nanofiber environment.
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Affiliation(s)
- Elif Arslan
- Institute of Materials Science and Nanotechnology, Nanotechnology Research Center (UNAM), Bilkent University , Ankara 06800, Turkey
| | - Mustafa O Guler
- Institute of Materials Science and Nanotechnology, Nanotechnology Research Center (UNAM), Bilkent University , Ankara 06800, Turkey
| | - Ayse B Tekinay
- Institute of Materials Science and Nanotechnology, Nanotechnology Research Center (UNAM), Bilkent University , Ankara 06800, Turkey
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28
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Ozkan AD, Tekinay AB, Guler MO, Tekin ED. Effects of temperature, pH and counterions on the stability of peptide amphiphile nanofiber structures. RSC Adv 2016. [DOI: 10.1039/c6ra21261a] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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29
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Modulating self-assembly behavior of a salt-free peptide amphiphile (PA) and zwitterionic surfactant mixed system. J Colloid Interface Sci 2015; 467:43-50. [PMID: 26773608 DOI: 10.1016/j.jcis.2015.12.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 12/01/2015] [Accepted: 12/01/2015] [Indexed: 11/24/2022]
Abstract
A salt-free surfactant system formed by a peptide amphiphile with short headgroup (PA,C16-GK-3) and a zwitterionic surfactant (dodecyldimethylamine oxide, C12DMAO) in water has been systematically investigated. The microstructures and properties of C16-GK-3/C12DMAO mixed system were characterized using a combination of microscopic, scattering and spectroscopic techniques, including transmission electron microscopy (TEM), field emission-scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), Fourier transform infrared (FT-IR), circular dichroism (CD) and rheological measurements. Rich phase transitions have been observed by adjusting the concentration of C16-GK-3. Investigation of the hydrogels of C16-GK-3/C12DMAO with TEM, SEM and AFM showed that all of these hydrogels form nanobelts. The nanobelt formation is performed in a hierarchical manner: β-sheet peptides and C12DMAO first interact each other to form small aggregates, which then arrange themselves to form one dimensional (1D) left-handed ribbons. The ribbons further aggregated into flat and rigid nanobelts. We proposed a mechanism to interpret the self-assembly process according to the specific peptide structure as well as multiple equilibria between the hydrogen bonding interactions between the headgroups of C16-GK-3, between C12DMAO molecules and the headgroups of C16-GK-3, chirality of the amino acid residues and hydrophobic interactions of the alkyl chains.
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30
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Mammadov R, Cinar G, Gunduz N, Goktas M, Kayhan H, Tohumeken S, Topal AE, Orujalipoor I, Delibasi T, Dana A, Ide S, Tekinay AB, Guler MO. Virus-like nanostructures for tuning immune response. Sci Rep 2015; 5:16728. [PMID: 26577983 PMCID: PMC4649742 DOI: 10.1038/srep16728] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 10/19/2015] [Indexed: 11/10/2022] Open
Abstract
Synthetic vaccines utilize viral signatures to trigger immune responses. Although the immune responses raised against the biochemical signatures of viruses are well characterized, the mechanism of how they affect immune response in the context of physical signatures is not well studied. In this work, we investigated the ability of zero- and one-dimensional self-assembled peptide nanostructures carrying unmethylated CpG motifs (signature of viral DNA) for tuning immune response. These nanostructures represent the two most common viral shapes, spheres and rods. The nanofibrous structures were found to direct immune response towards Th1 phenotype, which is responsible for acting against intracellular pathogens such as viruses, to a greater extent than nanospheres and CpG ODN alone. In addition, nanofibers exhibited enhanced uptake into dendritic cells compared to nanospheres or the ODN itself. The chemical stability of the ODN against nuclease-mediated degradation was also observed to be enhanced when complexed with the peptide nanostructures. In vivo studies showed that nanofibers promoted antigen-specific IgG production over 10-fold better than CpG ODN alone. To the best of our knowledge, this is the first report showing the modulation of the nature of an immune response through the shape of the carrier system.
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Affiliation(s)
- Rashad Mammadov
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Goksu Cinar
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Nuray Gunduz
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Melis Goktas
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Handan Kayhan
- Adult Hematology Laboratory, School of Medicine, Gazi University, Ankara 06500, Turkey
| | - Sehmus Tohumeken
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Ahmet E Topal
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Ilghar Orujalipoor
- Department of Physics Engineering, Hacettepe University, 06800, Ankara, Turkey
| | - Tuncay Delibasi
- Hacettepe University and Diskapi Research and Training Hospital, 06800, Ankara, Turkey
| | - Aykutlu Dana
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Semra Ide
- Department of Physics Engineering, Hacettepe University, 06800, Ankara, Turkey
| | - Ayse B Tekinay
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Mustafa O Guler
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
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31
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Moreno-Cortez IE, Romero-García J, González-González V, García-Gutierrez DI, Garza-Navarro MA, Cruz-Silva R. Encapsulation and immobilization of papain in electrospun nanofibrous membranes of PVA cross-linked with glutaraldehyde vapor. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 52:306-14. [DOI: 10.1016/j.msec.2015.03.049] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 03/12/2015] [Accepted: 03/23/2015] [Indexed: 10/23/2022]
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Fu IW, Nguyen HD. Sequence-Dependent Structural Stability of Self-Assembled Cylindrical Nanofibers by Peptide Amphiphiles. Biomacromolecules 2015; 16:2209-19. [DOI: 10.1021/acs.biomac.5b00595] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Iris W. Fu
- Department
of Chemical Engineering
and Materials Science, University of California, Irvine, Irvine, California 92697, United States
| | - Hung D. Nguyen
- Department
of Chemical Engineering
and Materials Science, University of California, Irvine, Irvine, California 92697, United States
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33
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Tekin ED. Molecular dynamics simulations of self-assembled peptide amphiphile based cylindrical nanofibers. RSC Adv 2015. [DOI: 10.1039/c5ra10685k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
We carried out united-atom molecular dynamics simulations to understand the structural properties of peptide amphiphile (PA)-based cylindrical nanofibers and the factors that play a role in the “Self-Assembly” process on some specific nanofibers.
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Affiliation(s)
- E. Deniz Tekin
- University of Turkish Aeronautical Association
- Ankara 06990
- Turkey
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34
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Sever M, Mammadov B, Guler MO, Tekinay AB. Tenascin-C Mimetic Peptide Nanofibers Direct Stem Cell Differentiation to Osteogenic Lineage. Biomacromolecules 2014; 15:4480-7. [DOI: 10.1021/bm501271x] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Melike Sever
- Institute of Materials Science
and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Busra Mammadov
- Institute of Materials Science
and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Mustafa O. Guler
- Institute of Materials Science
and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Ayse B. Tekinay
- Institute of Materials Science
and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
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35
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Sathaye S, Mbi A, Sonmez C, Chen Y, Blair DL, Schneider JP, Pochan DJ. Rheology of peptide- and protein-based physical hydrogels: Are everyday measurements just scratching the surface? WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2014; 7:34-68. [DOI: 10.1002/wnan.1299] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Revised: 07/11/2014] [Accepted: 08/07/2014] [Indexed: 01/30/2023]
Affiliation(s)
- Sameer Sathaye
- Department of Materials Science and Engineering and Delaware Biotechnology Institute; University of Delaware; Newark DE USA
| | - Armstrong Mbi
- Department of Physics; Georgetown University; Washington DC USA
| | - Cem Sonmez
- Department of Chemistry; University of Delaware; Newark DE USA
- Chemical Biology Laboratory; National Cancer Institute, Frederick National Laboratory for Cancer Research; Frederick MD USA
| | - Yingchao Chen
- Department of Materials Science and Engineering and Delaware Biotechnology Institute; University of Delaware; Newark DE USA
| | - Daniel L. Blair
- Department of Physics; Georgetown University; Washington DC USA
| | - Joel P. Schneider
- Chemical Biology Laboratory; National Cancer Institute, Frederick National Laboratory for Cancer Research; Frederick MD USA
| | - Darrin J. Pochan
- Department of Materials Science and Engineering and Delaware Biotechnology Institute; University of Delaware; Newark DE USA
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36
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Fu IW, Markegard CB, Chu BK, Nguyen HD. Role of hydrophobicity on self-assembly by peptide amphiphiles via molecular dynamics simulations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:7745-7754. [PMID: 24915982 DOI: 10.1021/la5012988] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Using a novel coarse-grained model, large-scale molecular dynamics simulations were performed to examine self-assembly of 800 peptide amphiphiles (sequence palmitoyl-V3A3E3). Under suitable physiological conditions, these molecules readily assemble into nanofibers leading to hydrogel construction as observed in experiments. Our simulations capture this spontaneous self-assembly process, including formation of secondary structure, to identify morphological transitions of distinctive nanostructures. As the hydrophobic interaction is increased, progression from open networks of secondary structures toward closed cylindrical nanostructures containing either β-sheets or random coils are observed. Moreover, temperature effects are also determined to play an important role in regulating formation of secondary structures within those nanostructures. These understandings of the molecular interactions involved and the role of environmental factors on hydrogel formation provide useful insight for development of innovative smart biomaterials for biomedical applications.
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Affiliation(s)
- Iris W Fu
- Department of Chemical Engineering and Materials Science, University of California-Irvine , Irvine, California 92697, United States
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37
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Fu IW, Markegard CB, Chu BK, Nguyen HD. The role of electrostatics and temperature on morphological transitions of hydrogel nanostructures self-assembled by peptide amphiphiles via molecular dynamics simulations. Adv Healthc Mater 2013; 2:1388-400. [PMID: 23554376 DOI: 10.1002/adhm.201200400] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2012] [Revised: 01/30/2013] [Indexed: 02/02/2023]
Abstract
Smart biomaterials that are self-assembled from peptide amphiphiles (PA) are known to undergo morphological transitions in response to specific physiological stimuli. The design of such customizable hydrogels is of significant interest due to their potential applications in tissue engineering, biomedical imaging, and drug delivery. Using a novel coarse-grained peptide/polymer model, which has been validated by comparison of equilibrium conformations from atomistic simulations, large-scale molecular dynamics simulations are performed to examine the spontaneous self-assembly process. Starting from initial random configurations, these simulations result in the formation of nanostructures of various sizes and shapes as a function of the electrostatics and temperature. At optimal conditions, the self-assembly mechanism for the formation of cylindrical nanofibers is deciphered involving a series of steps: (1) PA molecules quickly undergo micellization whose driving force is the hydrophobic interactions between alkyl tails; (2) neighboring peptide residues within a micelle engage in a slow ordering process that leads to the formation of β-sheets exposing the hydrophobic core; (3) spherical micelles merge together through an end-to-end mechanism to form cylindrical nanofibers that exhibit high structural fidelity to the proposed structure based on experimental data. As the temperature and electrostatics vary, PA molecules undergo alternative kinetic mechanisms, resulting in the formation of a wide spectrum of nanostructures. A phase diagram in the electrostatics-temperature plane is constructed delineating regions of morphological transitions in response to external stimuli.
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Affiliation(s)
- Iris W Fu
- Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, California 92697-2575, United States
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38
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Çakmak S, Çakmak AS, Gümüşderelioğlu M. RGD-bearing peptide-amphiphile-hydroxyapatite nanocomposite bone scaffold: an in vitro study. Biomed Mater 2013; 8:045014. [PMID: 23860136 DOI: 10.1088/1748-6041/8/4/045014] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
In this study, a fibrous nanocomposite scaffold was developed by combining hydroxyapatite (HA) fibers produced by electrospinning method and arginine-glycine-aspartic acid (RGD)-bearing peptide-amphiphile (PA) gel (PA-RGD) produced by self-assembly and gelation induced by calcium ions. Scanning electron microscope, transmission electron microscope and atomic force microscopy imaging confirmed the successful production of inorganic and organic components of this nanocomposite material. Within the HA, the presence of a CaCO3 phase, improving biodegradation, was shown by x-ray diffraction analysis. The in vitro effectiveness of the PA-RGD/HA scaffold was determined on MC3T3-E1 preosteoblast cultures in comparison with HA matrix and PA-RGD gel. The highest cellular proliferation was obtained on PA-RGD gel, however, alkaline phosphatase activity results denoted that osteogenic differentiation of the cells is more favorable on HA containing matrices with respect to PA-RGD itself. Microscopic observations revealed that all three matrices support cell attachment and proliferation. Moreover, cells form bridges between the HA and PA-RGD components of the nanocomposite scaffold, indicating the integrity of the biphasic components. According to the real time-polymerase chain reaction (RT-PCR) analyses, MC3T3-E1 cells expressed significantly higher osteocalcin on all matrices. Bone sialoprotein (BSP) expression level is ten-fold higher on PA-RGD/HA nanocomposite scaffolds than that of HA and PA-RGD scaffolds and the elevated expression of BSP on PA-RGD/HA nanocomposite scaffolds suggested higher mineralized matrix on this novel scaffold. Based on the results obtained in this study, the combination of HA nanofibers and PA-RGD gel takes advantage of good structural integrity during the cell culture, besides the osteoinductive and osteoconductive properties of the nanofibrous scaffold.
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Affiliation(s)
- Soner Çakmak
- Nanotechnology and Nanomedicine Department, Hacettepe University, Ankara, Turkey
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39
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Hamley IW, Dehsorkhi A, Castelletto V. Coassembly in binary mixtures of peptide amphiphiles containing oppositely charged residues. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:5050-9. [PMID: 23534557 DOI: 10.1021/la400163q] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The self-assembly in water of designed peptide amphiphile (PA) C16-ETTES containing two anionic residues and its mixtures with C16-KTTKS containing two cationic residues has been investigated. Multiple spectroscopy, microscopy, and scattering techniques are used to examine ordering extending from the β-sheet structures up to the fibrillar aggregate structure. The peptide amphiphiles both comprise a hexadecyl alkyl chain and a charged pentapeptide headgroup containing two charged residues. For C16-ETTES, the critical aggregation concentration was determined by fluorescence experiments. FTIR and CD spectroscopy were used to examine β-sheet formation. TEM revealed highly extended tape nanostructures with some striped regions corresponding to bilayer structures viewed edge-on. Small-angle X-ray scattering showed a main 5.3 nm bilayer spacing along with a 3 nm spacing. These spacings are assigned respectively to predominant hydrated bilayers and a fraction of dehydrated bilayers. Signs of cooperative self-assembly are observed in the mixtures, including reduced bundling of peptide amphiphile aggregates (extended tape structures) and enhanced β-sheet formation.
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Affiliation(s)
- I W Hamley
- School of Chemistry, Pharmacy and Food Biosciences, University of Reading, Reading, UK
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40
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Generation of Chimeric "ABS Nanohemostat" Complex and Comparing Its Histomorphological In Vivo Effects to the Traditional Ankaferd Hemostat in Controlled Experimental Partial Nephrectomy Model. Int J Biomater 2013; 2013:949460. [PMID: 23509463 PMCID: PMC3590747 DOI: 10.1155/2013/949460] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2012] [Revised: 12/13/2012] [Accepted: 01/20/2013] [Indexed: 11/17/2022] Open
Abstract
Purpose. Using the classical Ankaferd Blood Stopper (ABS) solution to create active hemostasis during partial nephrectomy (PN) may not be so effective due to insufficient contact surface between the ABS hemostatic liquid agent and the bleeding area. In order to broaden the contact surface, we generated a chimeric hemostatic agent, ABS nanohemostat, via combining a self-assembling peptide amphiphile molecule with the traditional Ankaferd hemostat. Materials and Methods. In order to generate ABS nanohemostat, a positively charged Peptide Amphiphile (PA) molecule was synthesized by using solid phase peptide synthesis. For animal experiments, 24 Wistar rats were divided into the following 4 groups: Group 1: control; Group 2: conventional PN with only 0.5 ml Ankaferd hemostat; Group 3: conventional PN with ABS + peptide gel; Group 4: conventional PN with only 0.5 ml peptide solution. Results. Mean warm ischemia times (WITs) were 232.8 ± 56.3, 65.6 ± 11.4, 75.5 ± 17.2, and 58.1 ± 17.6 seconds in Group 1 to Group 4, respectively. Fibrosis was not different among the groups, while inflammation was detected to be significantly different in G3 and G4. Conclusions. ABS nanohemostat has comparable hemostatic efficacy to the traditional Ankaferd hemostat in the partial nephrectomy experimental model. Elucidation of the cellular and tissue effects of this chimeric compound may establish a catalytic spark and open new avenues for novel experimental and clinical studies in the battlefield of hemostasis.
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41
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Structural transformation and physical properties of a hydrogel-forming peptide studied by NMR, transmission electron microscopy, and dynamic rheometer. Biophys J 2013; 103:979-88. [PMID: 23009847 DOI: 10.1016/j.bpj.2012.07.027] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 04/23/2012] [Accepted: 07/18/2012] [Indexed: 02/07/2023] Open
Abstract
Peptide-based hydrogels are attractive biological materials. Study of their self-assembly pathways from their monomer structures is important not only for undertaking the rational design of peptide-based materials, but also for understanding their biological functions and the mechanism of many human diseases relative to protein aggregation. In this work, we have monitored the conformation, morphological, and mechanical properties of a hydrogel-forming peptide during hydrogelation in different dimethylsulfoxide (DMSO)/H(2)O solutions. The peptide shows nanofiber morphologies in DMSO/H(2)O solution with a ratio lower than 4:1. Increased water percentage in the solution enhanced the hydrogelation rate and gel strength. One-dimensional and two-dimensional proton NMR and electron microscopy studies performed on the peptide in DMSO/H(2)O solution with different ratios indicate that the peptide monomer tends to adopt a more helical structure during the hydrogelation as the DMSO/H(2)O ratio is reduced. Interestingly, at the same DMSO/H(2)O ratio, adding Ca(2+) not only promotes peptide hydrogelation and gel strength, but also leads to special shear-thinning and recovery properties of the hydrogel. Without changing the peptide conformation, Ca(2+) binds to the charged Asp residues and induces the change of interfiber interactions that play an important role in hydrogel properties.
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42
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Extracellular matrix mimetic peptide scaffolds for neural stem cell culture and differentiation. Methods Mol Biol 2013; 1202:131-48. [PMID: 24519002 DOI: 10.1007/7651_2013_35] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Self-assembled peptide nanofibers form three-dimensional networks that are quite similar to fibrous extracellular matrix (ECM) in their physical structure. By incorporating short peptide sequences derived from ECM proteins, these nanofibers provide bioactive platforms for cell culture studies. This protocol provides information about preparation and characterization of self-assembled peptide nanofiber scaffolds, culturing of neural stem cells (NSCs) on these scaffolds, and analysis of cell behavior. As cell behavior analyses, viability and proliferation of NSCs as well as investigation of differentiation by immunocytochemistry, qRT-PCR, western blot, and morphological analysis on ECM mimetic peptide nanofiber scaffolds are described.
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43
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Tan A, Rajadas J, Seifalian AM. Biochemical engineering nerve conduits using peptide amphiphiles. J Control Release 2012; 163:342-52. [PMID: 22910143 DOI: 10.1016/j.jconrel.2012.08.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Revised: 08/05/2012] [Accepted: 08/07/2012] [Indexed: 12/30/2022]
Abstract
Peripheral nerve injury is a debilitating condition. The gold standard for treatment is surgery, requiring an autologous nerve graft. Grafts are harvested from another part of the body (a secondary site) to treat the affected primary area. However, autologous nerve graft harvesting is not without risks, with associated problems including injury to the secondary site. Research into biomaterials has engendered the use of bioartificial nerve conduits as an alternative to autologous nerve grafts. These include synthetic and artificial materials, which can be manufactured into nerve conduits using techniques inspired by nanotechnology. Recent evidence indicates that peptide amphiphiles (PAs) are promising candidates for use as materials for bioengineering nerve conduits. PAs are biocompatible and biodegradable protein-based nanomaterials, capable of self-assembly in aqueous solutions. Their self-assembly system, coupled with their intrinsic capacity for carrying bioactive epitopes for tissue regeneration, form particularly novel attributes for biochemically-engineered materials. Furthermore, PAs can function as biomimetic materials and advanced drug delivery platforms for sustained and controlled release of a plethora of therapeutic agents. Here we review the realm of nerve conduit tissue engineering and the potential for PAs as viable materials in this exciting and rapidly advancing field.
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Affiliation(s)
- Aaron Tan
- Centre for Nanotechnology & Regenerative Medicine, UCL Division of Surgery & Interventional Science, University College London, London, UK
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44
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Gallaher JK, Aitken EJ, Keyzers RA, Hodgkiss JM. Controlled aggregation of peptide-substituted perylene-bisimides. Chem Commun (Camb) 2012; 48:7961-3. [PMID: 22763491 DOI: 10.1039/c2cc31465g] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Controlled aggregation of perylene bisimides in multiple modes has been achieved via symmetric substitution with peptides. Using optical probes of aggregation, the balance of hydrophobic and electrostatic forces are found to play a key role in directing self assembly and are exploited via solvent, pH, and specific extrinsic ion effects.
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Affiliation(s)
- Joseph K Gallaher
- School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand
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45
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Mammadov B, Mammadov R, Guler MO, Tekinay AB. Cooperative effect of heparan sulfate and laminin mimetic peptide nanofibers on the promotion of neurite outgrowth. Acta Biomater 2012; 8:2077-86. [PMID: 22342826 DOI: 10.1016/j.actbio.2012.02.006] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Revised: 02/01/2012] [Accepted: 02/06/2012] [Indexed: 01/01/2023]
Abstract
Extracellular matrix contains an abundant variety of signals that are received by cell surface receptors contributing to cell fate, via regulation of cellular activities such as proliferation, migration and differentiation. Cues from extracellular matrix can be used for the development of materials to direct cells into their desired fate. Neural extracellular matrix (ECM) is rich in axonal growth inducer proteins, and by mimicking these permissive elements in the cellular environment, neural differentiation as well as neurite outgrowth can be induced. In this paper, we used a synthetic peptide nanofiber system that can mimic not only the activity of laminin, an axonal growth-promoting constituent of the neural ECM, but also the activity of heparan sulfate proteoglycans in order to induce neuritogenesis. Heparan sulfate mimetic groups that were utilized in our system have an affinity to growth factors and induce the neuroregenerative effect of laminin mimetic peptide nanofibers. The self-assembled peptide nanofibers with heparan sulfate mimetic and laminin-derived epitopes significantly promoted neurite outgrowth by PC-12 cells. In addition, these scaffolds were even effective in the presence of chondroitin sulfate proteoglycans (CSPGs), which are the major inhibitory components of the central nervous system. In the presence of these nanofibers, cells could overcome CSPG inhibitory effect and extend neurites on peptide nanofiber scaffolds.
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46
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Mammadov R, Tekinay AB, Dana A, Guler MO. Microscopic characterization of peptide nanostructures. Micron 2012; 43:69-84. [DOI: 10.1016/j.micron.2011.07.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2011] [Revised: 07/07/2011] [Accepted: 07/08/2011] [Indexed: 10/18/2022]
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47
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Garifullin R, Erkal TS, Tekin S, Ortaç B, Gürek AG, Ahsen V, Yaglioglu HG, Elmali A, Guler MO. Encapsulation of a zinc phthalocyanine derivative in self-assembled peptide nanofibers. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c1jm14181c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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48
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Mammadov R, Mammadov B, Toksoz S, Aydin B, Yagci R, Tekinay AB, Guler MO. Heparin Mimetic Peptide Nanofibers Promote Angiogenesis. Biomacromolecules 2011; 12:3508-19. [DOI: 10.1021/bm200957s] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Rashad Mammadov
- UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey
| | - Busra Mammadov
- UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey
| | - Sila Toksoz
- UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey
| | - Bahri Aydin
- Department of Ophthalmology, Medical School, Mersin University, Mersin 33343, Turkey
| | - Ramazan Yagci
- Department of Ophthalmology, Medical School, Fatih University, Ankara 06510, Turkey
| | - Ayse B. Tekinay
- UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey
| | - Mustafa O. Guler
- UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey
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49
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Bulut S, Erkal TS, Toksoz S, Tekinay AB, Tekinay T, Guler MO. Slow release and delivery of antisense oligonucleotide drug by self-assembled peptide amphiphile nanofibers. Biomacromolecules 2011; 12:3007-14. [PMID: 21707109 DOI: 10.1021/bm200641e] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Antisense oligonucleotides provide a promising therapeutic approach for several disorders including cancer. Chemical stability, controlled release, and intracellular delivery are crucial factors determining their efficacy. Gels composed of nanofibrous peptide network have been previously suggested as carriers for controlled delivery of drugs to improve stability and to provide controlled release, but have not been used for oligonucleotide delivery. In this work, a self-assembled peptide nanofibrous system is formed by mixing a cationic peptide amphiphile (PA) with Bcl-2 antisense oligodeoxynucleotide (ODN), G3139, through electrostatic interactions. The self-assembly of PA-ODN gel was characterized by circular dichroism, rheology, atomic force microscopy (AFM) and scanning electron microscopy (SEM). AFM and SEM images revealed establishment of the nanofibrous PA-ODN network. Due to the electrostatic interactions between PA and ODN, ODN release can be controlled by changing PA and ODN concentrations in the PA-ODN gel. Cellular delivery of the ODN by PA-ODN nanofiber complex was observed by using fluorescently labeled ODN molecule. Cells incubated with PA-ODN complex had enhanced cellular uptake compared to cells incubated with naked ODN. Furthermore, Bcl-2 mRNA amounts were lower in MCF-7 human breast cancer cells in the presence of PA-ODN complex compared to naked ODN and mismatch ODN evidenced by quantitative RT-PCR studies. These results suggest that PA molecules can control ODN release, enhance cellular uptake and present a novel efficient approach for gene therapy studies and oligonucleotide based drug delivery.
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Affiliation(s)
- Selma Bulut
- UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey
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