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Dong S, Chapman SL, Pluen A, Richardson SM, Miller AF, Saiani A. Effect of Peptide-Polymer Host-Guest Electrostatic Interactions on Self-Assembling Peptide Hydrogels Structural and Mechanical Properties and Polymer Diffusivity. Biomacromolecules 2024. [PMID: 38771115 DOI: 10.1021/acs.biomac.4c00232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Abstract
Peptide-based supramolecular hydrogels are an attractive class of soft materials for biomedical applications when biocompatibility is a key requirement as they exploit the physical self-assembly of short self-assembling peptides avoiding the need for chemical cross-linking. Based on the knowledge developed through our previous work, we designed two novel peptides, E(FKFE)2 and K(FEFK)2, that form transparent hydrogels at pH 7. We characterized the phase behavior of these peptides and showed the clear link that exists between the charge carried by the peptides and the physical state of the samples. We subsequently demonstrate the cytocompatibility of the hydrogel and its suitability for 3D cell culture using 3T3 fibroblasts and human mesenchymal stem cells. We then loaded the hydrogels with two polymers, poly-l-lysine and dextran. When polymer and peptide fibers carry opposite charges, the size of the elemental fibril formed decreases, while the overall level of fiber aggregation and fiber bundle formation increases. This overall network topology change, and increase in cross-link stability and density, leads to an overall increase in the hydrogel mechanical properties and stability, i.e., resistance to swelling when placed in excess media. Finally, we investigate the diffusion of the polymers out of the hydrogels and show how electrostatic interactions can be used to control the release of large molecules. The work clearly shows how polymers can be used to tailor the properties of peptide hydrogels through guided intermolecular interactions and demonstrates the potential of these new soft hydrogels for use in the biomedical field in particular for delivery or large molecular payloads and cells as well as scaffolds for 3D cell culture.
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Affiliation(s)
- Siyuan Dong
- Department of Chemical Engineering, School of Engineering, Faculty of Science and Engineering, The University of Manchester, Oxford Road, M13 9PL Manchester, U.K
- Manchester Institute of Biotechnology (MIB), Faculty of Science and Engineering, The University of Manchester, Oxford Road, M13 9PL Manchester, U.K
| | - Sam L Chapman
- Division of Pharmacy and Optometry, School of Health Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Oxford Road, M13 9PL Manchester, U.K
| | - Alain Pluen
- Division of Pharmacy and Optometry, School of Health Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Oxford Road, M13 9PL Manchester, U.K
| | - Stephen M Richardson
- Division of Cell Matrix Biology and Regenerative Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Manchester M13 9PT, U.K
| | - Aline F Miller
- Department of Chemical Engineering, School of Engineering, Faculty of Science and Engineering, The University of Manchester, Oxford Road, M13 9PL Manchester, U.K
- Manchester Institute of Biotechnology (MIB), Faculty of Science and Engineering, The University of Manchester, Oxford Road, M13 9PL Manchester, U.K
| | - Alberto Saiani
- Manchester Institute of Biotechnology (MIB), Faculty of Science and Engineering, The University of Manchester, Oxford Road, M13 9PL Manchester, U.K
- Division of Pharmacy and Optometry, School of Health Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Oxford Road, M13 9PL Manchester, U.K
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Atteya SM, Amer HA, Saleh SM, Safwat Y. The effect of nano silver fluoride, self-assembling peptide and sodium fluoride varnish on salivary cariogenic bacteria: a randomized controlled clinical trial. Clin Oral Investig 2024; 28:167. [PMID: 38388987 PMCID: PMC10884112 DOI: 10.1007/s00784-024-05562-0] [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: 08/24/2023] [Accepted: 02/14/2024] [Indexed: 02/24/2024]
Abstract
OBJECTIVES To compare the antibacterial effect of Nanosilver Fluoride varnish (NSF) varnish, P11-4 and Sodium Fluoride (NaF) varnish against salivary Streptococcus mutans (S. mutans) and Lactobacilli. METHODS 66 patients aged 10-24 years old were randomly assigned to receive single application of NSF, P11-4 or NaF varnish. Baseline unstimulated saliva samples were collected before the agents were applied and S.mutans and Lactobacilli colony forming units (CFU) were counted. After one, three and six months, microbiological samples were re-assessed. Groups were compared at each time point and changes across time were assessed. Multivariable linear regression compared the effect of P11-4 and NSF to NaF on salivary S. mutans and Lactobacilli log count at various follow up periods. RESULTS There was a significant difference in salivary S. mutans log count after 1 month between P11-4 (B= -1.29, p = 0.049) and NaF but not at other time points nor between NSF and NaF at any time point. The significant reduction in bacterial counts lasted up to one month in all groups, to three months after using P11-4 and NaF and returned to baseline values after six months. CONCLUSION In general, the antimicrobial effect of P11-4 and NSF on salivary S. mutans and Lactobacilli was not significantly different from NaF varnish. P11-4 induced greater reduction more quickly than the two other agents and NSF antibacterial effect was lost after one month. CLINICAL RELEVANCE NSF varnish and P11-4 have antimicrobial activity that does not significantly differ from NaF by 3 months. P11-4 has the greatest antibacterial effect after one month with sustained effect till 3 months. The antibacterial effect of NSF lasts for one month. NaF remains effective till 3 months. TRIAL REGISTRATION This trial was prospectively registered on the clinicaltrials.gov registry with ID: NCT04929509 on 18/6/2021.
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Affiliation(s)
- Sara M Atteya
- Department of Pediatric Dentistry and Dental Public Health, Faculty of Dentistry, Alexandria University, Champollion St, Egypt, Azarita, Alexandria, 21527, Egypt.
| | - Hala A Amer
- Department of Pediatric Dentistry and Dental Public Health, Faculty of Dentistry, Alexandria University, Champollion St, Egypt, Azarita, Alexandria, 21527, Egypt
| | - Susan M Saleh
- Department of Pediatric Dentistry and Dental Public Health, Faculty of Dentistry, Alexandria University, Champollion St, Egypt, Azarita, Alexandria, 21527, Egypt
| | - Yara Safwat
- Department of Medical Microbiology and Immunology, Faculty of Medicine, Alexandria University, Alexandria, Egypt
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Pan T, Wang Y, Zhang C. A method for in situ self-assembly of the catalytic peptide in enzymatic compartments of glucan particles. Methods Enzymol 2024; 697:247-268. [PMID: 38816125 DOI: 10.1016/bs.mie.2024.01.021] [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] [Indexed: 06/01/2024]
Abstract
Drawing inspiration from cellular compartmentalization, enzymatic compartments play a pivotal role in bringing enzymes and substrates into confined environments, offering heightened catalytic efficiency and prolonged enzyme lifespan. Previously, we engineered bioinspired enzymatic compartments, denoted as TPE-Q18H@GPs, achieved through the spatiotemporally controllable self-assembly of the catalytic peptide TPE-Q18H within hollow porous glucan particles (GPs). This design strategy allows substrates and products to freely traverse, while retaining enzymatic aggregations. The confined environment led to the formation of catalytic nanofibers, resulting in enhanced substrate binding affinity and a more than two-fold increase in the second-order kinetic constant (kcat/Km) compared to TPE-Q18H nanofibers in a dispersed system. In this work, we will introduce how to synthesize the above-mentioned enzymatic compartments using salt-responsive catalytic peptides and GPs.
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Affiliation(s)
- Tiezheng Pan
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive Materials of Ministry of Education and College of Life Sciences, Nankai University, Tianjin, P.R. China; School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| | - Yaling Wang
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive Materials of Ministry of Education and College of Life Sciences, Nankai University, Tianjin, P.R. China
| | - Chunqiu Zhang
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive Materials of Ministry of Education and College of Life Sciences, Nankai University, Tianjin, P.R. China.
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Atteya SM, Amer HA, Saleh SM, Safwat Y. Self-assembling peptide and nano-silver fluoride in remineralizing early enamel carious lesions: randomized controlled clinical trial. BMC Oral Health 2023; 23:577. [PMID: 37598194 PMCID: PMC10439642 DOI: 10.1186/s12903-023-03269-4] [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: 04/04/2023] [Accepted: 07/29/2023] [Indexed: 08/21/2023] Open
Abstract
BACKGROUND Nanoparticles and regenerative biomineralization are new caries prevention technologies. This study assessed the remineralizing effect of self-assembling peptide (P11-4), Nanosilver Fluoride (NSF) and sodium fluoride (NaF) on white spot lesions (WSLs) in permanent teeth. METHODS Sixty six young adults with WSLs on buccal surfaces in permanent teeth and ICDAS code 1 or 2, were randomly assigned to one of three groups; P11-4, NSF or NaF. Assessment of ICDAS scores, lesion activity (Nyvad scores) and diagnodent readings of lesions were done at baseline and after 1, 3, 6 and 12 months of agents' application. Comparisons between groups were made using chi squared test and comparison within groups were made using McNemar test. Multilevel binary logistic regression was used to assess the effect of agents on change of ICDAS scores after 3, 6 and 12 months (reduction versus no reduction). RESULTS There were 147 teeth in 66 patients; mean ± SD age = 13.46 ± 4.31 years. There were significant differences in the change of ICDAS scores among the three groups after 3 and 6 months (p = 0.005). The reduction in ICDAS score increased steadily in all groups across time with the greatest increase in the P11-4 group: 54.5% after 12 months. Lesion activity (Nyvad scores) showed significant differences among the three groups with the greatest percentage of inactive cases in the P11-4 group. Multilevel binary logistic regression showed non-significant reduction of ICDAS in P11-4 and NSF varnishes compared to NaF varnish (AOR = 2.56, 95% CI: 0.58, 8.77 and AOR = 2.12, 95% CI: 0.59, 7.64 respectively). CONCLUSION P11-4 and NSF varnish reduced the ICDAS scores, caries activity and diagnodent readings of WSLs in permanent teeth. However, the change in ICDAS scores was not significantly different from NaF. TRIAL REGISTRATION This trial was prospectively registered on the clinicaltrials.gov registry with ID: NCT04929509 on 18/6/2021.
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Affiliation(s)
- Sara M Atteya
- Department of Pediatric Dentistry and Dental Public Health, Faculty of Dentistry, Alexandria University, Champollion St., Azarita, 21527, Alexandria, Egypt.
| | - Hala A Amer
- Department of Pediatric Dentistry and Dental Public Health, Faculty of Dentistry, Alexandria University, Champollion St., Azarita, 21527, Alexandria, Egypt
| | - Susan M Saleh
- Department of Pediatric Dentistry and Dental Public Health, Faculty of Dentistry, Alexandria University, Champollion St., Azarita, 21527, Alexandria, Egypt
| | - Yara Safwat
- Department of Medical Microbiology and Immunology, Faculty of Medicine, Alexandria University, Alexandria, Egypt
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Pramanik B, Ahmed S. Peptide-Based Low Molecular Weight Photosensitive Supramolecular Gelators. Gels 2022; 8:gels8090533. [PMID: 36135245 PMCID: PMC9498526 DOI: 10.3390/gels8090533] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 08/22/2022] [Accepted: 08/23/2022] [Indexed: 11/20/2022] Open
Abstract
Over the last couple of decades, stimuli-responsive supramolecular gels comprising synthetic short peptides as building blocks have been explored for various biological and material applications. Though a wide range of stimuli has been tested depending on the structure of the peptides, light as a stimulus has attracted extensive attention due to its non-invasive, non-contaminant, and remotely controllable nature, precise spatial and temporal resolution, and wavelength tunability. The integration of molecular photo-switch and low-molecular-weight synthetic peptides may thus provide access to supramolecular self-assembled systems, notably supramolecular gels, which may be used to create dynamic, light-responsive “smart” materials with a variety of structures and functions. This short review summarizes the recent advancement in the area of light-sensitive peptide gelation. At first, a glimpse of commonly used molecular photo-switches is given, followed by a detailed description of their incorporation into peptide sequences to design light-responsive peptide gels and the mechanism of their action. Finally, the challenges and future perspectives for developing next-generation photo-responsive gels and materials are outlined.
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Affiliation(s)
- Bapan Pramanik
- Department of Chemistry, Ben-Gurion University of the Negev, Be’er Sheva 84105, Israel
- Correspondence: (B.P.); (S.A.)
| | - Sahnawaz Ahmed
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research Kolkata, Kolkata 700054, India
- Correspondence: (B.P.); (S.A.)
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Bioinspired enzymatic compartments constructed by spatiotemporally confined in situ self-assembly of catalytic peptide. Commun Chem 2022; 5:81. [PMID: 36697908 PMCID: PMC9814850 DOI: 10.1038/s42004-022-00700-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 06/29/2022] [Indexed: 01/28/2023] Open
Abstract
Enzymatic compartments, inspired by cell compartmentalization, which bring enzymes and substrates together in confined environments, are of particular interest in ensuring the enhanced catalytic efficiency and increased lifetime of encapsulated enzymes. Herein, we constructed bioinspired enzymatic compartments (TPE-Q18H@GPs) with semi-permeability by spatiotemporally controllable self-assembly of catalytic peptide TPE-Q18H in hollow porous glucan particles (GPs), allowing substrates and products to pass in/out freely, while enzymatic aggregations were retained. Due to the enrichment of substrates and synergistic effect of catalytic nanofibers formed in the confined environment, the enzymatic compartments exhibited stronger substrate binding affinity and over two-fold enhancement of second-order kinetic constant (kcat/Km) compared to TPE-Q18H nanofibers in disperse system. Moreover, GPs enabled the compartments sufficient stability against perturbation conditions, such as high temperature and degradation. This work opens an intriguing avenue to construct enzymatic compartments using porous biomass materials and has fundamental implications for constructing artificial organelles and even artificial cells.
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Effectiveness of Self-Assembling Peptide (P11-4) in Dental Hard Tissue Conditions: A Comprehensive Review. Polymers (Basel) 2022; 14:polym14040792. [PMID: 35215706 PMCID: PMC8879648 DOI: 10.3390/polym14040792] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 02/13/2022] [Accepted: 02/16/2022] [Indexed: 12/04/2022] Open
Abstract
The limitations on the use of fluoride therapy in dental caries prevention has necessitated the development of newer preventive agents. This review focusses on the recent and significant studies on P11-4 peptide with an emphasis on different applications in dental hard tissue conditions. The self-assembling peptide P11-4 diffuses into the subsurface lesion assembles into aggregates throughout the lesion, supporting the nucleation of de novo hydroxyapatite nanocrystals, resulting in increased mineral density. P11-4 treated teeth shows more remarkable changes in the lesion area between the first and second weeks. The biomimetic remineralisation facilitated in conjunction with fluoride application is an effective and non-invasive treatment for early carious lesions. Despite, some studies have reported that the P11-4 group had the least amount of remineralised enamel microhardness and a significantly lower mean calcium/phosphate weight percentage ratio than the others. In addition, when compared to a low-viscosity resin, self-assembling peptides could neither inhibit nor mask the lesions significantly. Moreover, when it is combined with other agents, better results can be achieved, allowing more effective biomimetic remineralisation. Other applications discussed include treatment of dental erosion, tooth whitening and dentinal caries. However, the evidence on its true clinical potential in varied dental diseases still remains under-explored, which calls for future cohort studies on its in vivo efficacy.
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Bommer C, Waller T, Hilbe M, Wiedemeier D, Meyer N, Mathes S, Jung R. Efficacy and safety of P 11-4 for the treatment of periodontal defects in dogs. Clin Oral Investig 2022; 26:3151-3166. [PMID: 35006293 PMCID: PMC8898238 DOI: 10.1007/s00784-021-04297-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 11/11/2021] [Indexed: 11/29/2022]
Abstract
Objectives This study’s aim was to investigate the safety and performance of a self-assembling peptide matrix (SAPM) P11-4 for the treatment of periodontal disease in a controlled pre-clinical study. Materials and methods Acute buccal bony dehiscence defects (LxW: 5 × 3 mm) were surgically created on the distal root of four teeth on one mandible side of 7 beagle dogs followed by another identical surgery 8 weeks later on the contralateral side. SAPM P11-4 (with and without root conditioning with 24% EDTA (T1, T2)), Emdogain® (C) and a sham intervention (S) were randomly applied on the four defects at each time point. Four weeks after the second surgery and treatment, the animals were sacrificed, the mandibles measured by micro-computed tomography (µ-CT) and sections of the tissue were stained and evaluated histologically. Results Clinically and histologically, no safety concerns or pathological issues due to the treatments were observed in any of the study groups at any time point. All groups showed overall similar results after 4 and 12 weeks of healing regarding new cementum, functionality of newly formed periodontal ligament and recovery of height and volume of the new alveolar bone and mineral density. Conclusion A controlled clinical study in humans should be performed in a next step as no adverse effects or safety issues, which might affect clinical usage of the product, were observed. Clinical relevance The synthetic SAPM P11-4 may offer an alternative to the animal-derived product Emdogain® in the future. Supplementary Information The online version contains supplementary material available at 10.1007/s00784-021-04297-6.
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Affiliation(s)
| | - Tobias Waller
- Clinic for Reconstructive Dentistry, University of Zurich, Plattenstrasse 11, 8032, Zurich, Switzerland
| | - Monika Hilbe
- Laboratory for Animal Model Pathology (LAMP), Institute of Veterinary Pathology, University of Zurich, Winterthurerstrasse 268, 8057, Zurich, Switzerland
| | - Daniel Wiedemeier
- Center of Dental Medicine, Statistical Services, University of Zurich, Plattenstrasse 11, 8032, Zurich, Switzerland
| | - Nina Meyer
- Department for Chemistry and Biotechnology, Zurich University of Applied Sciences, 8820, Wädenswil, Switzerland
| | - Stephanie Mathes
- Department for Chemistry and Biotechnology, Zurich University of Applied Sciences, 8820, Wädenswil, Switzerland
| | - Ronald Jung
- Clinic for Reconstructive Dentistry, University of Zurich, Plattenstrasse 11, 8032, Zurich, Switzerland.
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Nishimura SN, Nishida K, Tanaka M. A β-hairpin peptide with pH-controlled affinity for tumor cells. Chem Commun (Camb) 2021; 58:505-508. [PMID: 34874387 DOI: 10.1039/d1cc06218b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Considering that the pH in the tumor microenvironment is dysregulated, we designed a β-hairpin peptide (SSRFEWEFESSDPRGDPSSRFEWEFESS). The configuration of the peptide switched from a flexible linear to a rigid loop structure under weakly acidic conditions. The peptide internalized by tumor cells increased significantly under weakly acidic conditions.
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Affiliation(s)
- Shin-Nosuke Nishimura
- Institute for Materials Chemistry and Engineering, Kyushu University, 744, Moto-oka, Nishi-ku, Fukuoka, 819-0395, Japan.
| | - Kei Nishida
- Institute for Materials Chemistry and Engineering, Kyushu University, 744, Moto-oka, Nishi-ku, Fukuoka, 819-0395, Japan.
| | - Masaru Tanaka
- Institute for Materials Chemistry and Engineering, Kyushu University, 744, Moto-oka, Nishi-ku, Fukuoka, 819-0395, Japan.
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Warren JP, Miles DE, Kapur N, Wilcox RK, Beales PA. Hydrodynamic Mixing Tunes the Stiffness of Proteoglycan-Mimicking Physical Hydrogels. Adv Healthc Mater 2021; 10:e2001998. [PMID: 33943034 DOI: 10.1002/adhm.202001998] [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: 11/16/2020] [Revised: 02/23/2021] [Indexed: 11/09/2022]
Abstract
Self-assembling hydrogels are promising materials for regenerative medicine and tissue engineering. However, designing hydrogels that replicate the 3-4 order of magnitude variation in soft tissue mechanics remains a major challenge. Here hybrid hydrogels are investigated formed from short self-assembling β-fibril peptides, and the glycosaminoglycan chondroitin sulfate (CS), chosen to replicate physical aspects of proteoglycans, specifically natural aggrecan, which provides structural mechanics to soft tissues. Varying the peptide:CS compositional ratio (1:2, 1:10, or 1:20) can tune the mechanics of the gel by one to two orders of magnitude. In addition, it is demonstrated that at any fixed composition, the gel shear modulus can be tuned over approximately two orders of magnitude through varying the initial vortex mixing time. This tuneability arises due to changes in the mesoscale structure of the gel network (fibril width, length, and connectivity), giving rise to both shear-thickening and shear-thinning behavior. The resulting hydrogels range in shear elastic moduli from 0.14 to 220 kPa, mimicking the mechanical variability in a range of soft tissues. The high degree of discrete tuneability of composition and mechanics in these hydrogels makes them particularly promising for matching the chemical and mechanical requirements of different applications in tissue engineering and regenerative medicine.
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Affiliation(s)
- James P. Warren
- School of Chemistry University of Leeds Leeds LS2 9JT UK
- School of Mechanical Engineering University of Leeds Leeds LS2 9JT UK
- Institute of Medical and Biological Engineering University of Leeds Leeds LS2 9JT UK
| | - Danielle E. Miles
- School of Chemistry University of Leeds Leeds LS2 9JT UK
- School of Mechanical Engineering University of Leeds Leeds LS2 9JT UK
- Institute of Medical and Biological Engineering University of Leeds Leeds LS2 9JT UK
| | - Nikil Kapur
- School of Mechanical Engineering University of Leeds Leeds LS2 9JT UK
| | - Ruth K. Wilcox
- School of Mechanical Engineering University of Leeds Leeds LS2 9JT UK
- Institute of Medical and Biological Engineering University of Leeds Leeds LS2 9JT UK
| | - Paul A. Beales
- School of Chemistry University of Leeds Leeds LS2 9JT UK
- Astbury Centre for Structural Biology University of Leeds Leeds LS2 9JT UK
- Bragg Centre for Materials Research University of Leeds Leeds LS2 9JT UK
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Lai HY, Setyawati MI, Ferhan AR, Divakarla SK, Chua HM, Cho NJ, Chrzanowski W, Ng KW. Self-Assembly of Solubilized Human Hair Keratins. ACS Biomater Sci Eng 2021; 7:83-89. [PMID: 33356132 DOI: 10.1021/acsbiomaterials.0c01507] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Human hair keratins have proven to be a viable biomaterial for diverse regenerative applications. However, the most significant characteristic of this material, the ability to self-assemble into nanoscale intermediate filaments, has not been exploited. Herein, we successfully demonstrated the induction of hair-extracted keratin self-assembly in vitro to form dense, homogeneous, and continuous nanofibrous networks. These networks remain hydrolytically stable in vitro for up to 5 days in complete cell culture media and are compatible with primary human dermal fibroblasts and keratinocytes. These results enhance the versatility of human hair keratins for applications where structured assembly is of benefit.
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Affiliation(s)
- Hui Ying Lai
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.,Nanyang Environment & Water Research Institute (Environmental Chemistry and Materials Centre), Interdisciplinary Graduate Program, Nanyang Technological University, Singapore
| | - Magdiel Inggrid Setyawati
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Abdul Rahim Ferhan
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Shiva Kamini Divakarla
- The University of Sydney, Sydney Nano Institute, Faculty of Medicine and Health, Sydney Pharmacy School, Sydney, New South Wales 2006, Australia
| | - Huei Min Chua
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Wojciech Chrzanowski
- The University of Sydney, Sydney Nano Institute, Faculty of Medicine and Health, Sydney Pharmacy School, Sydney, New South Wales 2006, Australia
| | - Kee Woei Ng
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.,Nanyang Environment & Water Research Institute (Environmental Chemistry and Materials Centre), Interdisciplinary Graduate Program, Nanyang Technological University, Singapore.,Skin Research Institute of Singapore, Biomedical Science Institutes, Immunos, 8A Biomedical Grove, Singapore 138648, Singapore.,Department of Environmental Health, Harvard T.H. Chan School of Public Health, 665 Huntington Avenue, Boston, Massachusetts 02115, United States
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Castillo-Díaz LA, Ruiz-Pacheco JA, Elsawy MA, Reyes-Martínez JE, Enríquez-Rodríguez AI. Self-Assembling Peptides as an Emerging Platform for the Treatment of Metabolic Syndrome. Int J Nanomedicine 2020; 15:10349-10370. [PMID: 33376325 PMCID: PMC7762440 DOI: 10.2147/ijn.s278189] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 10/21/2020] [Indexed: 12/14/2022] Open
Abstract
Metabolic syndrome comprises a cluster of comorbidities that represent a major risk of developing chronic diseases, such as type II diabetes, cardiovascular diseases, and stroke. Alarmingly, metabolic syndrome reaches epidemic proportions worldwide. Today, lifestyle changes and multiple drug-based therapies represent the gold standard to address metabolic syndrome. However, such approaches face two major limitations: complicated drug therapeutic regimes, which in most cases could lead to patient incompliance, and limited drug efficacy. This has encouraged scientists to search for novel routes to deal with metabolic syndrome and related diseases. Within such approaches, self-assembled peptide formulations have emerged as a promising alternative for treating metabolic syndrome. In particular, self-assembled peptide hydrogels, either as acellular or cell-load three-dimensional scaffoldings have reached significant relevance in the biomedical field to prevent and restore euglycemia, as well as for controlling cardiovascular diseases and obesity. This has been possible thanks to the physicochemical tunability of peptides, which are developed from a chemical toolbox of versatile amino acids enabling flexibility of designing a wide range of self-assembled/co-assembled nanostructures forming biocompatible viscoelastic hydrogels. Peptide hydrogels can be combined with several biological entities, such as extracellular matrix proteins, drugs or cells, forming functional biologics with therapeutic ability for treatment of metabolic syndrome-comorbidities. Additionally, self-assembly peptides combine safety, tolerability, and effectivity attributes; by this presenting a promising platform for the development of novel pharmaceuticals capable of addressing unmet therapeutic needs for diabetes, cardiovascular disorders and obesity. In this review, recent advances in developing self-assembly peptide nanostructures tailored for improving treatment of metabolic syndrome and related diseases will be discussed from basic research to preclinical research studies. Challenges facing the development of approved medicinal products based on self-assembling peptide nanomaterials will be discussed in light of regulatory requirement for clinical authorization.
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Affiliation(s)
| | - Juan Alberto Ruiz-Pacheco
- West Biomedical Research Center, National Council of Science and Technology, Guadalajara, Jalisco, Mexico
| | - Mohamed Ahmed Elsawy
- Leicester Institute for Pharmaceutical Innovation, Leicester School of Pharmacy, De Montfort University, Leicester, Leicestershire, UK
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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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14
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15
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Gharaei R, Tronci G, Goswami P, Davies RPW, Kirkham J, Russell SJ. Biomimetic peptide enriched nonwoven scaffolds promote calcium phosphate mineralisation. RSC Adv 2020; 10:28332-28342. [PMID: 35519117 PMCID: PMC9055731 DOI: 10.1039/d0ra02446e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 07/11/2020] [Indexed: 01/24/2023] Open
Abstract
Cell-free translational strategies are needed to accelerate the repair of mineralised tissues, particularly large bone defects, using minimally invasive approaches. Regenerative bone scaffolds should ideally mimic aspects of the tissue's ECM over multiple length scales and enable surgical handling and fixation during implantation in vivo. Leveraging the knowledge gained with bioactive self-assembling peptides (SAPs) and SAP-enriched electrospun fibres, we presented a cell free approach for promoting mineralisation via apatite deposition and crystal growth, in vitro, of SAP-enriched nonwoven scaffolds. The nonwoven scaffold was made by electrospinning poly(ε-caprolactone) (PCL) in the presence of either peptide P11-4 (Ac-QQRFEWEFEQQ-Am) or P11-8 (Ac QQRFOWOFEQQ-Am), in light of the polymer's fibre forming capability and its hydrolytic degradability as well as the well-known apatite nucleating capability of SAPs. The 11-residue family of peptides (P11-X) has the ability to self-assemble into β-sheet ordered structures at the nano-scale and to generate hydrogels at the macroscopic scale, some of which are capable of promoting biomineralisation due to their apatite-nucleating capability. Both variants of SAP-enriched nonwoven used in this study were proven to be biocompatible with murine fibroblasts and supported nucleation and growth of apatite minerals in simulated body fluid (SBF) in vitro. The fibrous nonwoven provided a structurally robust scaffold, with the capability to control SAP release behaviour. Up to 75% of P11-4 and 45% of P11-8 were retained in the fibres after 7 day incubation in aqueous solution at pH 7.4. The encapsulation of SAP in a nonwoven system with apatite-forming as well as localised and long-term SAP delivery capabilities is appealing as a potential means of achieving cost-effective bone repair therapy for critical size defects. A structurally robust electrospun peptide-enriched scaffold, with controlled peptide release behaviour, supports nucleation and growth of hydroxyapatite minerals in vitro.![]()
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Affiliation(s)
- Robabeh Gharaei
- Clothworkers' Centre for Textile Materials Innovation for Healthcare, University of Leeds UK
| | - Giuseppe Tronci
- Clothworkers' Centre for Textile Materials Innovation for Healthcare, University of Leeds UK .,Division of Oral Biology, School of Dentistry, St James' University Hospital Leeds UK
| | | | - Robert P Wynn Davies
- Division of Oral Biology, School of Dentistry, St James' University Hospital Leeds UK
| | - Jennifer Kirkham
- Division of Oral Biology, School of Dentistry, St James' University Hospital Leeds UK
| | - Stephen J Russell
- Clothworkers' Centre for Textile Materials Innovation for Healthcare, University of Leeds UK
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16
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Wong KM, Wang Y, Seroski DT, Larkin GE, Mehta AK, Hudalla GA, Hall CK, Paravastu AK. Molecular complementarity and structural heterogeneity within co-assembled peptide β-sheet nanofibers. NANOSCALE 2020; 12:4506-4518. [PMID: 32039428 DOI: 10.1039/c9nr08725g] [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
Self-assembling peptides have garnered an increasing amount of interest as a functional biomaterial for medical and biotechnological applications. Recently, β-sheet peptide designs utilizing complementary pairs of peptides composed of charged amino acids positioned to impart co-assembly behavior have expanded the portfolio of peptide aggregate structures. Structural characterization of these charge-complementary peptide co-assemblies has been limited. Thus, it is not known how the complementary peptides organize on the molecular level. Through a combination of solid-state NMR measurements and discontinuous molecular dynamics simulations, we investigate the molecular organization of King-Webb peptide nanofibers. KW+ and KW- peptides co-assemble into near stoichiometric two-component β-sheet structures as observed by computational simulations and 13C-13C dipolar couplings. A majority of β-strands are aligned with antiparallel nearest neighbors within the β-sheet as previously suggested by Fourier transform infrared spectroscopy measurements. Surprisingly, however, a significant proportion of β-strand neighbors are parallel. While charge-complementary peptides were previously assumed to organize in an ideal (AB)n pattern, dipolar recoupling measurements on isotopically diluted nanofiber samples reveal a non-negligible amount of self-associated (AA and BB) pairs. Furthermore, computational simulations predict these different structures can coexist within the same nanofiber. Our results highlight structural disorder at the molecular level in a charge-complementary peptide system with implications on co-assembling peptide designs.
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Affiliation(s)
- Kong M Wong
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
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17
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Gao J, Zhan J, Yang Z. Enzyme-Instructed Self-Assembly (EISA) and Hydrogelation of Peptides. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1805798. [PMID: 31018025 DOI: 10.1002/adma.201805798] [Citation(s) in RCA: 146] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 02/19/2019] [Indexed: 06/09/2023]
Abstract
Self-assembly is a powerful tool for constructing supramolecular materials for many applications, ranging from energy harvesting to biomedicine. Among the methods to prepare supramolecular materials for biomedical applications, enzyme-instructed self-assembly (EISA) has several advantages. Herein, the unique properties and advantages of EISA in preparing biofunctional supramolecular nanomaterials and hydrogels from peptides are highlighted. EISA can trigger molecular self-assembly in situ. Therefore, using overexpression enzymes in disease sites, supramolecular materials can be formed in situ to improve the selectivity and efficacy of the treatment. The precursor may be involved during the EISA process, and it is actually a two-component self-assembly process. The precursor can help to stabilize the assembled nanostructures of hydrophobic peptides formed by EISA. More importantly, the precursor may determine the outcome of molecular self-assembly. Recently, it was also observed that EISA can kinetically control the peptide folding and morphology and cellular uptake behavior of supramolecular nanomaterials. With the combination of other methods to trigger molecular self-assembly, researchers can form supramolecular nanomaterials in a more precise mode and sometimes under spatiotemporal control. EISA is a powerful and unique methodology to prepare supramolecular biofunctional materials that cannot be generated from other common methods.
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Affiliation(s)
- Jie Gao
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, State Key Laboratory of Medicinal Chemical Biology, National Institute for Advanced Materials, and Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin, 300071, P. R. China
| | - Jie Zhan
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, State Key Laboratory of Medicinal Chemical Biology, National Institute for Advanced Materials, and Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin, 300071, P. R. China
| | - Zhimou Yang
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, State Key Laboratory of Medicinal Chemical Biology, National Institute for Advanced Materials, and Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin, 300071, P. R. China
- Jiangsu Center for the Collaboration and Innovation of Cancer Biotherapy, Cancer Institute, Xuzhou Medical University, Xuzhou, Jiangsu, 221004, P. R. China
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18
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Chen Y, Liu B, Guo L, Xiong Z, We G. Enzyme-instructed self-assembly of peptides: Process, dynamics, nanostructures, and biomedical applications. AIMS BIOPHYSICS 2020. [DOI: 10.3934/biophy.2020028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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19
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Saha S, Yang XB, Wijayathunga N, Harris S, Feichtinger GA, Davies RPW, Kirkham J. A biomimetic self-assembling peptide promotes bone regeneration in vivo: A rat cranial defect study. Bone 2019; 127:602-611. [PMID: 31351196 DOI: 10.1016/j.bone.2019.06.020] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Revised: 05/31/2019] [Accepted: 06/20/2019] [Indexed: 01/09/2023]
Abstract
Rationally designed, pH sensitive self-assembling β-peptides (SAPs) which are capable of reversibly switching between fluid and gel phases in response to environmental triggers are potentially useful injectable scaffolds for skeletal tissue engineering applications. SAP P11-4 (CH3COQQRFEWEFEQQNH2) has been shown to nucleate hydroxyapatite mineral de novo and has been used in dental enamel regeneration. We hypothesised that addition of mesenchymal stromal cells (MSCs) would enhance the in vivo effects of P11-4 in promoting skeletal tissue repair. Cranial defects were created in athymic rats and filled with either Bio-Oss® (anorganic bone chips) or P11-4 ± human dental pulp stromal cells (HDPSCs). Unfilled defects served as controls. After 4 weeks, only those defects filled with P11-4 alone showed significantly increased bone regeneration (almost complete healing), compared to unfilled control defects, as judged using quantitative micro-CT, histology and immunohistochemistry. In silico modelling indicated that fibril formation may be essential for any mineral nucleation activity. Taken together, these data suggest that self-assembling peptides are a suitable scaffold for regeneration of bone tissue in a one step, cell-free therapeutic approach.
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Affiliation(s)
- Sushmita Saha
- Department of Oral Biology, School of Dentistry, St James's University Hospital, University of Leeds, Leeds, UK
| | - Xuebin B Yang
- Department of Oral Biology, School of Dentistry, St James's University Hospital, University of Leeds, Leeds, UK
| | | | - Sarah Harris
- School of Physics and Astronomy, Astbury Centre for Structural and Molecular Biology, University of Leeds, Leeds, UK
| | - Georg A Feichtinger
- Department of Oral Biology, School of Dentistry, St James's University Hospital, University of Leeds, Leeds, UK
| | - R Philip W Davies
- Department of Oral Biology, School of Dentistry, St James's University Hospital, University of Leeds, Leeds, UK.
| | - Jennifer Kirkham
- Department of Oral Biology, School of Dentistry, St James's University Hospital, University of Leeds, Leeds, UK
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20
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Li G, Li S, Sun J, Yuan Z, Song A, Hao J. Peptide-based hydrogels with tunable nanostructures for the controlled release of dyes. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.08.055] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Mulvee M, Vasiljevic N, Mann S, Patil AJ. Construction of supramolecular hydrogels using photo-generated nitric oxide radicals. SOFT MATTER 2018; 14:5950-5954. [PMID: 30010173 DOI: 10.1039/c8sm00651b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Photo-generated nitric oxide radicals (NO˙) derived from sodium nitroprusside dihydrate (SNP) are employed for the construction of supramolecular hydrogels based on an amino acid derivative precursor, N-fluorenylmethyloxycarbonyl tyrosine phosphate (FYP), which through dephosphorylation produces the gelator, N-fluorenylmethyloxycarbonyl tyrosine (FY). Self-assembly of the amphiphilic gelator yields high-aspect ratio nanofilaments that entangle to form self-supporting, viscoelastic hydrogels. The presence of photolyzed SNP yields periodically twisted nanofilaments with opposite chirality to filaments formed through conventional hydrogelation routes.
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Affiliation(s)
- Matthew Mulvee
- Centre for Organized Matter Chemistry and Centre for Protocell Research, School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK.
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22
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Shanbhag BK, Liu C, Haritos VS, He L. Understanding the Interplay between Self-Assembling Peptides and Solution Ions for Tunable Protein Nanoparticle Formation. ACS NANO 2018; 12:6956-6967. [PMID: 29928801 DOI: 10.1021/acsnano.8b02381] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Protein-based nanomaterials are gaining importance in biomedical and biosensor applications where tunability of the protein particle size is highly desirable. Rationally designed proteins and peptides offer control over molecular interactions between monomeric protein units to modulate their self-assembly and thus particle formation. Here, using an example enzyme-peptide system produced as a single construct by bacterial expression, we explore how solution conditions affect the formation and size of protein nanoparticles. We found two independent routes to particle formation, one facilitated by charge interactions between protein-peptide and peptide-peptide exemplified by pH change or the presence of NO3- or NH4+ and the second route via metal-ion coordination ( e.g., Mg2+) within peptides. We further demonstrate that the two independent factors of pH and Mg2+ ions can be combined to regulate nanoparticle size. Charge interactions between protein-peptide monomers play a key role in either promoting or suppressing protein assembly; the intermolecular contact points within protein-peptide monomers involved in nanoparticle formation were identified by chemical cross-linking mass spectrometry. Importantly, the protein nanoparticles retain their catalytic activities, suggesting that their native structures are unaffected. Once formed, protein nanoparticles remain stable over long periods of storage or with changed solution conditions. Nevertheless, formation of nanoparticles is also reversible-they can be disassembled by desalting the buffer to remove complexing agents ( e.g., Mg2+). This study defines the factors controlling formation of protein nanoparticles driven by self-assembly peptides and an understanding of complex ion-peptide interactions involved within, offering a convenient approach to tailor protein nanoparticles without changing amino acid sequence.
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Affiliation(s)
- Bhuvana K Shanbhag
- Department of Chemical Engineering , Monash University , Wellington Road , Clayton , VIC 3800 , Australia
| | - Chang Liu
- Department of Chemical Engineering , Monash University , Wellington Road , Clayton , VIC 3800 , Australia
| | - Victoria S Haritos
- Department of Chemical Engineering , Monash University , Wellington Road , Clayton , VIC 3800 , Australia
| | - Lizhong He
- Department of Chemical Engineering , Monash University , Wellington Road , Clayton , VIC 3800 , Australia
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23
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Caine BA, Dardonville C, Popelier PLA. Prediction of Aqueous p K a Values for Guanidine-Containing Compounds Using Ab Initio Gas-Phase Equilibrium Bond Lengths. ACS OMEGA 2018; 3:3835-3850. [PMID: 31458625 PMCID: PMC6641350 DOI: 10.1021/acsomega.8b00142] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 03/21/2018] [Indexed: 05/06/2023]
Abstract
In this work, we demonstrate the existence of linear relationships between gas-phase equilibrium bond lengths of the guanidine skeleton of 2-(arylamino)imidazolines and their aqueous pK a value. For a training set of 22 compounds, in the most stable conformation of their lowest energy tautomeric form, three bonds were found to exhibit r 2 and q 2 values >0.95 and root-mean-squared-error of estimation values ≤0.25 when regressed individually against pK a. The equations describing these one-bond-length linear relationships, in addition to a multiple linear regression model using all three bond lengths, were then used to predict the experimental pK a values of an external test set of further 27 derivatives. The optimal protocol we derive here shows an overall mean absolute error (MAE) of 0.20 and standard deviation of errors of 0.18 for the test set. Predictions for a second test set of diphenyl-based bis(2-iminoimidazolidines) yielded an MAE of 0.27 and a standard deviation of 0.10. The predictive power of the optimal model is further demonstrated by its ability to correct erroneously reported experimental values. Finally, a previously established guanidine model is recalibrated at a new level of theory, and predictions are made for novel phenylguanidine derivatives, showing an MAE of just 0.29. The protocols established and tested here pass both of Roy's modern and stringent MAE-based criteria for a "good" quantitative structure-activity relationship/quantitative structure-property relationship model predictivity. Notably, the ab initio bond length high correlation subset protocol developed in this work demonstrates lower MAE values than the Marvin program by ChemAxon for all test sets.
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Affiliation(s)
- Beth A. Caine
- Manchester
Institute of Biotechnology (MIB), 131 Princess Street, Manchester M1 7DN, Great Britain
- School
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, Great
Britain
| | | | - Paul L. A. Popelier
- Manchester
Institute of Biotechnology (MIB), 131 Princess Street, Manchester M1 7DN, Great Britain
- School
of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, Great
Britain
- E-mail: . Phone: +44 161
3064511 (P.L.A.P.)
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24
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Zhao W, Xing X, Kang B, Zhu X, Ai H. Positive effect of strong acidity on the twist of Aβ 42 fibrils and the counteraction of Aβ 42 N-terminus. J Mol Graph Model 2018; 82:59-66. [PMID: 29698798 DOI: 10.1016/j.jmgm.2018.04.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2018] [Revised: 03/26/2018] [Accepted: 04/04/2018] [Indexed: 11/28/2022]
Abstract
pH is a crucial factor in terms of affecting the aggregation and morphology of β-Amyloid and hence a focus of study. In this study, structural and mechanical properties of a series of models (5, 6, …, 30 layer) of one-fold Aβ42 fibrils at pH 1.5, 3.0 and 7.5, have been computed by using all-atom molecular dynamics simulations. 12, 14, and 15 layers are established to be the smallest realistic models for Aβ42 fibrils at pH 1.5, 3.0 and 7.5, with twist angles of 0.40°, 0.34°, 0.31° respectively, disclosing the favorable effect of strong acidity on fibril twist. However, these angles are all lower than that (0.48°) determined for the truncated Aβ17-42 fibril at pH 7.5, indicating that the disordered N-terminal depresses greatly the fibril twist and the lower pH disfavors the depression. Three commonly used indices to measure the fibril properties, namely number of H-bonds, interstrand distance and β-sheet content have imperceptible changes with the pH alternation, therefore changes in fibril twist can be taken as a probe to monitor fibril properties. By contrast, N-terminus is determined not only to inhibit the U-shaped fibril twist by hampering the stagger between β1 and β2 strands, but also to play a vital carrier role in feeling solution (i.e., pH, salt) changes. These results can help design the nextgeneration of amyloid materials for state-of-the-art bio-nano-med applications by changing the solution pH or modifying chain length.
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Affiliation(s)
- Wei Zhao
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, China
| | - Xiaofeng Xing
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, China
| | - Baotao Kang
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, China
| | - Xueying Zhu
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, China
| | - Hongqi Ai
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, China.
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25
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Suda S, Takamizawa T, Takahashi F, Tsujimoto A, Akiba S, Nagura Y, Kurokawa H, Miyazaki M. Application of the Self- Assembling Peptide P11-4 for Prevention of Acidic Erosion. Oper Dent 2018. [PMID: 29513639 DOI: 10.2341/17-175-l] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The aim of this study was to use ultrasonography to evaluate the effect of the self-assembling peptide P11-4 on acid erosion prevention. Curodont Repair (CR), which includes peptide P11-4, was used. Rectangular prisms of bovine enamel (4×1×1 mm) were immersed in pure orange juice for a period of 5 minutes six times per day for 28 days. These samples were divided into four groups of six specimens each and treated differently for an additional period of 28 days: 1) baseline group specimens were stored in artificial saliva; 2) CR group specimens were exposed to curodont without acid challenge; 3) NCRA (no curodont+acid challenge) specimens were treated with orange juice without curodont exposure; and 4) CRA (CR+acid challenge) specimens were treated with curodont before treatment with orange juice. The propagation time of longitudinal ultrasonic velocity (UV) was measured. Ultrastructural observation of each tested enamel surface was carried out using field-emission scanning electron microscopy (SEM). The UV data were analyzed using two-way analysis of variance with time and treatment as confounding factors. Post hoc pairwise tests among groups were performed using the Tukey honestly significant difference test. The average UV in intact bovine enamel for the baseline group ranged from 4,483 to 4,549 m/s and did not vary significantly within the test period. The average ultrasonic velocity (UV) in all samples decreased after the initial erosion. The UV in NCRA decreased further over time. Increased UVs were found for CR and CRA. For CR and CRA, there was no significant difference in UV at the end of the experiment from the initial value before erosion. In the results of SEM observation, the CR and CRA groups had similar morphologic features in that etching patterns were not clearly due to precipitation between the enamel rods. From the results of this in vitro study, it might be concluded that applying enamel matrix derivatives and self-assembling peptides on erosive lesions can improve remineralization.
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26
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Zhao W, Ai H. Effect of pH on Aβ 42 Monomer and Fibril-like Oligomers-Decoding in Silico of the Roles of pK Values of Charged Residues. Chemphyschem 2018; 19:1103-1116. [PMID: 29380494 DOI: 10.1002/cphc.201701384] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Indexed: 01/10/2023]
Abstract
Amyloid beta-peptide (Aβ) is the key to developing Alzheimer's disease. Experiments have confirmed that different acidity influences directly not only the structural morphology and population of Aβ oligomers, but also the toxicity. The atomic-level association between the pH, charged residues, and Aβ properties remains obscure. Herein, conformational changes of Aβ42 monomer, fibril-like trimer, and pentamer in the medium pH range of 4.0-7.5 are studied. The results reveal that, as the pH changes from 7.5 to the isoelectric pH, His6, His13, and His14 are protonated in turn, successively approach the center of mass of folded Aβ monomer, trigger ionic interactions and changes of neighboring turns (Asp7-Ser8, His14-Lys16) and even a distant one (Leu34-Met35), as well as concomitant changes of secondary structure, and promote the conformation transition from unfolded to folded. This observation discloses that protonation can convert these charged residues from originally hydrophilic to "hydrophobic-like". For fibril-like oligomers, the pH susceptibility essentially stems from the pK values of charged residues in the context of the Aβ fibril, and in turn one can predict the dynamic behavior of these residues in the processes of dissociation or stabilization of a fibril by comparing the pK values of residues involved in salt bridges in the normal state with those in the current context. This idea is justified by two fibril models and appears to be applicable to other peptides and their fibril systems.
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Affiliation(s)
- Wei Zhao
- Shandong Provincial Key Laboratory, of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, P. R. China
| | - Hongqi Ai
- Shandong Provincial Key Laboratory, of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, P. R. China
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27
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Koch F, Müller M, König F, Meyer N, Gattlen J, Pieles U, Peters K, Kreikemeyer B, Mathes S, Saxer S. Mechanical characteristics of beta sheet-forming peptide hydrogels are dependent on peptide sequence, concentration and buffer composition. ROYAL SOCIETY OPEN SCIENCE 2018; 5:171562. [PMID: 29657766 PMCID: PMC5882690 DOI: 10.1098/rsos.171562] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Accepted: 02/09/2018] [Indexed: 06/08/2023]
Abstract
Self-assembling peptide hydrogels can be modified regarding their biodegradability, their chemical and mechanical properties and their nanofibrillar structure. Thus, self-assembling peptide hydrogels might be suitable scaffolds for regenerative therapies and tissue engineering. Owing to the use of various peptide concentrations and buffer compositions, the self-assembling peptide hydrogels might be influenced regarding their mechanical characteristics. Therefore, the mechanical properties and stability of a set of self-assembling peptide hydrogels, consisting of 11 amino acids, made from four beta sheet self-assembling peptides in various peptide concentrations and buffer compositions were studied. The formed self-assembling peptide hydrogels exhibited stiffnesses ranging from 0.6 to 205 kPa. The hydrogel stiffness was mostly affected by peptide sequence followed by peptide concentration and buffer composition. All self-assembling peptide hydrogels examined provided a nanofibrillar network formation. A maximum self-assembling peptide hydrogel dissolution of 20% was observed for different buffer solutions after 7 days. The stability regarding enzymatic and bacterial digestion showed less degradation in comparison to the self-assembling peptide hydrogel dissolution rate in buffer. The tested set of self-assembling peptide hydrogels were able to form stable scaffolds and provided a broad spectrum of tissue-specific stiffnesses that are suitable for a regenerative therapy.
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Affiliation(s)
- Franziska Koch
- School of Life Sciences, Institute for Chemistry and Bioanalytics, University of Applied Sciences and Arts Northwestern Switzerland, Muttenz, Switzerland
| | - Michael Müller
- Department for Health Science and Technology, Cartilage Engineering and Regeneration Laboratory, ETH Zurich, Zurich, Switzerland
| | - Finja König
- Master Program of Protein Science and Technology, Linköping University, Linköping, Sweden
| | - Nina Meyer
- Department for Chemistry and Biotechnology, Tissue Engineering, Zurich University of Applied Sciences, Wädenswil, Switzerland
| | - Jasmin Gattlen
- Department for Chemistry and Biotechnology, Tissue Engineering, Zurich University of Applied Sciences, Wädenswil, Switzerland
| | - Uwe Pieles
- School of Life Sciences, Institute for Chemistry and Bioanalytics, University of Applied Sciences and Arts Northwestern Switzerland, Muttenz, Switzerland
| | - Kirsten Peters
- Department of Cell Biology, University Medicine Rostock, Rostock, Germany
| | - Bernd Kreikemeyer
- Institute of Medical Microbiology, Virology and Hygiene, University Medicine Rostock, Rostock, Germany
| | - Stephanie Mathes
- Department for Chemistry and Biotechnology, Tissue Engineering, Zurich University of Applied Sciences, Wädenswil, Switzerland
| | - Sina Saxer
- School of Life Sciences, Institute for Chemistry and Bioanalytics, University of Applied Sciences and Arts Northwestern Switzerland, Muttenz, Switzerland
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28
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Betush RJ, Urban JM, Nilsson BL. Balancing hydrophobicity and sequence pattern to influence self-assembly of amphipathic peptides. Biopolymers 2018; 110. [PMID: 29292825 DOI: 10.1002/bip.23099] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 12/01/2017] [Accepted: 12/04/2017] [Indexed: 01/25/2023]
Abstract
Amphipathic peptides with alternating polar and nonpolar amino acid sequences efficiently self-assemble into functional β-sheet fibrils as long as the nonpolar residues have sufficient hydrophobicity. For example, the Ac-(FKFE)2 -NH2 peptide rapidly self-assembles into β-sheet bilayer nanoribbons, while Ac-(AKAE)2 -NH2 fails to self-assemble under similar conditions due to the significantly reduced hydrophobicity and β-sheet propensity of Ala relative to Phe. Herein, we systematically explore the effect of substituting only two of the four Ala residues at various positions in the Ac-(AKAE)2 -NH2 peptide with amino acids of increasing hydrophobicity, β-sheet potential, and surface area (including Phe, 1-naphthylalanine (1-Nal), 2-naphthylalanine (2-Nal), cyclohexylalanine (Cha), and pentafluorophenylalanine (F5 -Phe)) on the self-assembly propensity of the resulting sequences. It was found that double Phe variants, regardless of the position of substitution, failed to self-assemble under the conditions used in this study. In contrast, all double 1-Nal and 2-Nal variants readily self-assembled, albeit at differing rates depending on the substitution patterns. To determine whether this was due to hydrophobicity or side chain surface area, we also prepared double Cha and F5 -Phe variant peptides (both side chain groups are more hydrophobic than Phe). Each of these variants also underwent effective self-assembly, with the aromatic F5 -Phe peptides doing so with greater efficiency. These findings provide insight into the role of amino acid hydrophobicity and sequence pattern on self-assembly proclivity of amphipathic peptides and on how targeted substitutions of nonpolar residues in these sequences can be exploited to tune the characteristics of the resulting self-assembled materials.
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Affiliation(s)
- Ria J Betush
- Department of Chemistry, Gannon University, Erie, Pennsylvania
| | - Jennifer M Urban
- Department of Chemistry, University of Rochester, Rochester, New York
| | - Bradley L Nilsson
- Department of Chemistry, University of Rochester, Rochester, New York
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29
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Liu G, Feng J, Zhu W, Jiang Y. Zein self-assembly using the built-in ultrasonic dialysis process: microphase behavior and the effect of dialysate properties. Colloid Polym Sci 2017. [DOI: 10.1007/s00396-017-4238-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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30
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DiMaio JTM, Doran TM, Ryan DM, Raymond DM, Nilsson BL. Modulating Supramolecular Peptide Hydrogel Viscoelasticity Using Biomolecular Recognition. Biomacromolecules 2017; 18:3591-3599. [PMID: 28872306 DOI: 10.1021/acs.biomac.7b00925] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Self-assembled peptide-based hydrogels are emerging materials that have been exploited for wound healing, drug delivery, tissue engineering, and other applications. In comparison to synthetic polymer hydrogels, supramolecular peptide-based gels have advantages in biocompatibility, biodegradability, and ease of synthesis and modification. Modification of the emergent viscoelasticity of peptide hydrogels in a stimulus responsive fashion is a longstanding goal in the development of next-generation materials. In an effort to selectively modulate hydrogel viscoelasticity, we report herein a method to enhance the elasticity of β-sheet peptide hydrogels using specific molecular recognition events between functionalized hydrogel fibrils and biomolecules. Two distinct biomolecular recognition strategies are demonstrated: oligonucleotide Watson-Crick duplex formation between peptide nucleic acid (PNA) modified fibrils with a bridging oligonucleotide and protein-ligand recognition between mannose modified fibrils with concanavalin A. These methods to modulate hydrogel elasticity should be broadly adaptable in the context of these materials to a wide variety of molecular recognition partners.
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Affiliation(s)
- John T M DiMaio
- University of Rochester , Department of Chemistry, Rochester, New York 14627, United States
| | - Todd M Doran
- University of Rochester , Department of Chemistry, Rochester, New York 14627, United States
| | - Derek M Ryan
- University of Rochester , Department of Chemistry, Rochester, New York 14627, United States
| | - Danielle M Raymond
- University of Rochester , Department of Chemistry, Rochester, New York 14627, United States
| | - Bradley L Nilsson
- University of Rochester , Department of Chemistry, Rochester, New York 14627, United States
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31
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Auer S. Simple Model of the Effect of Solution Conditions on the Nucleation of Amyloid Fibrils. J Phys Chem B 2017; 121:8893-8901. [DOI: 10.1021/acs.jpcb.7b05400] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stefan Auer
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
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32
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Rajbhandary A, Raymond DM, Nilsson BL. Self-Assembly, Hydrogelation, and Nanotube Formation by Cation-Modified Phenylalanine Derivatives. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:5803-5813. [PMID: 28514156 DOI: 10.1021/acs.langmuir.7b00686] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Fluorenylmethoxycarbonyl-protected phenylalanine (Fmoc-Phe) derivatives are a privileged class of molecule that spontaneously self-assemble into hydrogel fibril networks. Fmoc-Phe-derived hydrogels are typically formed by dilution of the hydrogelator from an organic cosolvent into water, by dissolution of the hydrogelator under basic aqueous conditions followed by adjustment of the pH with acid, or by other external triggering forces, including sonication and heating. These conditions complicate biological applications of these hydrogels. Herein, we report C-terminal cation-modified Fmoc-Phe derivatives that are positively charged across a broad range of pH values and that can self-assemble and form hydrogel networks spontaneously without the need to adjust pH or to use an organic cosolvent. In addition, these cationic Fmoc-Phe derivatives are found to self-assemble into novel sheet-based nanotube structures at higher concentrations. These nanotube structures are unique to C-terminal cationic Fmoc-Phe derivatives; the parent Fmoc-Phe carboxylic acids form only fibril or worm-like micelle structures. Nanotube formation by the cationic Fmoc-Phe molecules is dependent on positive charge at the C-terminus, since at basic pH where the positive charge is reduced only fibrils/worm-like micelles are formed and nanotube formation is suppressed. These studies provide an important example of Fmoc-Phe derivatives that can elicit hydrogelation without organic cosolvent or pH modification and also provide insight into how subtle modification of structure can perturb the self-assembly pathways of Fmoc-Phe derivatives.
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Affiliation(s)
- Annada Rajbhandary
- Department of Chemistry, University of Rochester , Rochester, New York 14627-0216, United States
| | - Danielle M Raymond
- Department of Chemistry, University of Rochester , Rochester, New York 14627-0216, United States
| | - Bradley L Nilsson
- Department of Chemistry, University of Rochester , Rochester, New York 14627-0216, United States
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33
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Kind L, Stevanovic S, Wuttig S, Wimberger S, Hofer J, Müller B, Pieles U. Biomimetic Remineralization of Carious Lesions by Self-Assembling Peptide. J Dent Res 2017; 96:790-797. [PMID: 28346861 DOI: 10.1177/0022034517698419] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Caries is the most common disease in the world. Great efforts have been undertaken for prevention and to identify a regenerative treatment solution for dental caries. Self-assembling β-sheet forming peptides have previously shown to form 3-dimensional fiber networks supporting tissue regeneration. In particular, the self-assembling peptide P11-4 has shown potential in the treatment and prevention of dental caries. It has previously been shown that application of monomeric P11-4 solution to early carious lesions can increase net mineral gain by forming de novo hydroxyapatite crystals. The hypothesis for the mode of action was that monomeric self-assembling peptide P11-4 diffuses into the subsurface lesion body and assembles therein into higher order fibrils, facilitating mineralization of the subsurface volume by mimicking the natural biomineralization of the tooth enamel, and it remains within the lesion body as a scaffold built-in by the newly formed hydroxyapatite. The aim of the present study was to investigate the mechanism of action of the self-assembling peptide P11-4 supporting mineralization of carious enamel. By various analytical methods, it could be shown that the self-assembling peptide P11-4 diffuses into the subsurface lesion, assembles into higher formed aggregates throughout the whole volume of the lesion, and supports nucleation of de novo hydroxyapatite nanocrystals and consequently results in increased mineral density within the subsurface carious lesion. The results showed that the application of self-assembling peptide P11-4 can facilitate the subsurface regeneration of the enamel lesion by supporting de novo mineralization in a similar mode of action as has been shown for the natural formation of dental enamel.
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Affiliation(s)
- L Kind
- 1 School of Life Sciences, Department of Chemistry and Bioanalytics, University of Applied Sciences and Arts Northwestern Switzerland (FHNW), Muttenz, Switzerland
| | - S Stevanovic
- 1 School of Life Sciences, Department of Chemistry and Bioanalytics, University of Applied Sciences and Arts Northwestern Switzerland (FHNW), Muttenz, Switzerland
| | - S Wuttig
- 1 School of Life Sciences, Department of Chemistry and Bioanalytics, University of Applied Sciences and Arts Northwestern Switzerland (FHNW), Muttenz, Switzerland
| | - S Wimberger
- 1 School of Life Sciences, Department of Chemistry and Bioanalytics, University of Applied Sciences and Arts Northwestern Switzerland (FHNW), Muttenz, Switzerland
| | - J Hofer
- 1 School of Life Sciences, Department of Chemistry and Bioanalytics, University of Applied Sciences and Arts Northwestern Switzerland (FHNW), Muttenz, Switzerland
| | - B Müller
- 2 Department of Biomedical Engineering, University of Basel, Biomaterials Science Center (BMC), Allschwil, Switzerland
| | - U Pieles
- 1 School of Life Sciences, Department of Chemistry and Bioanalytics, University of Applied Sciences and Arts Northwestern Switzerland (FHNW), Muttenz, Switzerland
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34
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Miles DE, Mitchell EA, Kapur N, Beales PA, Wilcox RK. Peptide:glycosaminoglycan hybrid hydrogels as an injectable intervention for spinal disc degeneration. J Mater Chem B 2016; 4:3225-3231. [PMID: 27429755 PMCID: PMC4920072 DOI: 10.1039/c6tb00121a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 03/29/2016] [Indexed: 12/17/2022]
Abstract
Degeneration of the spinal discs is a major cause of back pain. During the degeneration process, there is a loss of glycosaminoglycans (GAGs) from the proteoglycan-rich gel in the disc's nucleus, which adversely alters biomechanical performance. Current surgical treatments for back pain are highly invasive and have low success rates; there is an urgent need for minimally-invasive approaches that restore the physiological mechanics of the spine. Here we present an injectable peptide:GAG hydrogel that rapidly self-assembles in situ and restores the mechanics of denucleated intervertebral discs. It forms a gel with comparable mechanical properties to the native tissue within seconds to minutes depending on the peptide chosen. Unlike other biomaterials that have been proposed for this purpose, these hybrid hydrogels can be injected through a very narrow 25 G gauge needle, minimising damage to the surrounding soft tissue, and they mimic the ability of the natural tissue to draw in water by incorporating GAGs. Furthermore, the GAGs enhance the gelation kinetics and thermodynamic stability of peptide hydrogels, significantly reducing effusion of injected material from the intervertebral disc (GAG leakage of 8 ± 3% after 24 h when peptide present, compared to 39 ± 3% when no peptide present). In an ex vivo model, we demonstrate that the hydrogels can restore the compressive stiffness of denucleated bovine intervertebral discs. Compellingly, this novel biomaterial has the potential to transform the clinical treatment of back pain by resolving current surgical challenges, thus improving patient quality of life.
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Affiliation(s)
- D E Miles
- Institute of Medical and Biological Engineering , University of Leeds , Leeds , LS2 9JT , UK . ; School of Chemistry , University of Leeds , Leeds , LS2 9JT , UK .
| | - E A Mitchell
- Institute of Medical and Biological Engineering , University of Leeds , Leeds , LS2 9JT , UK . ; School of Biomedical Sciences , University of Leeds , Leeds , LS2 9JT , UK
| | - N Kapur
- School of Mechanical Engineering , University of Leeds , Leeds , LS2 9JT , UK
| | - P A Beales
- School of Chemistry , University of Leeds , Leeds , LS2 9JT , UK . ; Astbury Centre for Structural Molecular Biology , University of Leeds , Leeds , LS2 9JT , UK
| | - R K Wilcox
- Institute of Medical and Biological Engineering , University of Leeds , Leeds , LS2 9JT , UK . ; School of Mechanical Engineering , University of Leeds , Leeds , LS2 9JT , UK
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35
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Wang M, Yin Y. Magnetically Responsive Nanostructures with Tunable Optical Properties. J Am Chem Soc 2016; 138:6315-23. [PMID: 27115174 DOI: 10.1021/jacs.6b02346] [Citation(s) in RCA: 108] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Stimuli-responsive materials can sense specific environmental changes and adjust their physical properties in a predictable manner, making them highly desired components for designing novel sensors, intelligent systems, and adaptive structures. Magnetically responsive structures have unique advantages in applications, as external magnetic stimuli can be applied in a contactless manner and cause rapid and reversible responses. In this Perspective, we discuss our recent progress in the design and fabrication of nanostructured materials with various optical responses to externally applied magnetic fields. We demonstrate tuning of the optical properties by taking advantage of the magnetic fields' abilities to induce magnetic dipole-dipole interactions or control the orientation of the colloidal magnetic nanostructures. The design strategies are expected to be extendable to the fabrication of novel responsive materials with new optical effects and many other physical properties.
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Affiliation(s)
- Mingsheng Wang
- Department of Chemistry, University of California , Riverside, California 92521, United States
| | - Yadong Yin
- Department of Chemistry, University of California , Riverside, California 92521, United States
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36
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Lee NR, Bowerman CJ, Nilsson BL. Sequence length determinants for self-assembly of amphipathic β-sheet peptides. Biopolymers 2016; 100:738-50. [PMID: 23553562 DOI: 10.1002/bip.22248] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Revised: 03/18/2013] [Accepted: 03/22/2013] [Indexed: 12/29/2022]
Abstract
Amphipathic peptides composed of alternating hydrophobic and hydrophilic amino acids are a privileged class of peptide, which have a high propensity to self-assemble into β-sheet fibrils. The Ac-(FKFE)2-NH2 peptide has been extensively studied and forms putative β-sheet bilayer fibrils in which the hydrophobic Phe side chains are organized to a single face of each constituent sheet; upon bilayer formation, these hydrophobic benzyl groups are sequestered in the hydrophobic core of the resulting fibril. In order for the Phe side chains to be uniformly displayed on one face of Ac-(FKFE)2-NH2 β-sheets, an antiparallel packing orientation in which one amino acid residue is unpaired must be adopted. Based on molecular models, we hypothesized that truncated seven amino acid derivatives of Ac-(FKFE)2-NH2 in which either the N-terminal Phe residue (Ac-KFEFKFE-NH2) or the C-terminal Glu residue (Ac-FKFEFKF-NH2) is eliminated should readily self-assemble into β-sheet bilayers in which all hydrogen bond and hydrophobic/charge interactions are satisfied. We found, however, that these minute changes in peptide sequence have unanticipated and dramatic effects on the self-assembly of each peptide. Ac-FKFEFKF-NH2 self-assembled into fibrils with unique morphology relative to the parent peptide, whereas the Ac-KFEFKFE-NH2 peptide had a strongly reduced propensity to self-assemble, even failing to self-assemble altogether under some conditions. These findings provide significant insight into the effect of sequence length and strand registry as well as hydrophobicity and charge on the self-assembly of simple amphipathic peptides to illuminate the possibility of tuning self-assembly processes and the resulting structures with minute changes to peptide sequence.
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Affiliation(s)
- Naomi R Lee
- Department of Chemistry, University of Rochester, Rochester, NY, 14627-0216
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37
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Luan J, Lu C, Guo Y, Li F, Wang G. Influence of selective solvents on self-assembly behaviors of amphiphilic hyperbranched poly(aryl ether ketone)-graft-poly(ethylene glycol) rod–coil copolymer. HIGH PERFORM POLYM 2016. [DOI: 10.1177/0954008316639116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
An amphiphilic hyperbranched poly(aryl ether ketone)- graft-poly(ethylene glycol) (HPAEK- graft-PEG) rod–coil copolymer was synthesized by grafting linear PEG onto hydroxyl-terminated HPAEK (OH-HPAEK). The molecular structure, the number-average molecular weight and the thermal properties of HPAEK- graft-PEG were characterized by proton nuclear magnetic resonance and Fourier transform infrared spectroscopies, gel permeation chromatography, differential scanning calorimetry, and thermogravimetric analysis, respectively. The self-assembly behaviors of HPAEK- graft-PEG in the mixed solvents were investigated by transmission electron microscopy and scanning electron microscopy. The results demonstrated that the selective solvent in the used mixed solvents exerted remarkable influence on the morphology of the resulting micelles. When the mixed solvents were water/tetrahydrofuran (THF), trichloromethane/THF, and toluene/THF, that is, with the decrease of the selective solvents in polarity, HPAEK- graft-PEG could self-assemble into the regular microspheres with obvious core–shell structure, the similar quadrilateral-shaped micelles with the dimension of about 20 nm and the large complicated clew-shaped micelles, as well as the irregular large compound micelles, respectively. It is worth mentioning that the similar quadrilateral-shaped micelles were different from the toroidal micelles reported already, which had relatively obvious “angle”. The phenomenon may be ascribed that the rigid characteristic of rod HAPEK segment was conducive to the maintenance of the metastable state.
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Affiliation(s)
- Jiashuang Luan
- College of Chemistry, Engineering Research Center of High Performance Plastics, Ministry of Education, Jilin University, Changchun, China
| | - Chunhua Lu
- Department of Applied Chemical Engineering, Jilin Vocational College of Industry and Technology, Jilin, China
| | - Yunliang Guo
- College of Chemistry, Engineering Research Center of High Performance Plastics, Ministry of Education, Jilin University, Changchun, China
| | - Feng Li
- College of Chemistry, Engineering Research Center of High Performance Plastics, Ministry of Education, Jilin University, Changchun, China
| | - Guibin Wang
- College of Chemistry, Engineering Research Center of High Performance Plastics, Ministry of Education, Jilin University, Changchun, China
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38
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Gharaei R, Tronci G, Davies RP, Goswami P, Russell SJ. An investigation into the nano-/micro-architecture of electrospun poly (ε-caprolactone) and self-assembling peptide fibers. ACTA ACUST UNITED AC 2016. [DOI: 10.1557/adv.2016.35] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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39
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De Leon Rodriguez LM, Hemar Y, Cornish J, Brimble MA. Structure–mechanical property correlations of hydrogel forming β-sheet peptides. Chem Soc Rev 2016; 45:4797-824. [DOI: 10.1039/c5cs00941c] [Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This review discusses about β-sheet peptide structure at the molecular level and the bulk mechanical properties of the corresponding hydrogels.
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Affiliation(s)
| | - Yacine Hemar
- School of Chemical Sciences
- The University of Auckland
- Auckland
- New Zealand
- The Riddet Institute
| | - Jillian Cornish
- Department of Medicine
- The University of Auckland
- Auckland
- New Zealand
| | - Margaret A. Brimble
- School of Chemical Sciences
- The University of Auckland
- Auckland
- New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery
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40
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Gharaei R, Tronci G, Davies RPW, Gough C, Alazragi R, Goswami P, Russell SJ. A structurally self-assembled peptide nano-architecture by one-step electrospinning. J Mater Chem B 2016; 4:5475-5485. [DOI: 10.1039/c6tb01164k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Peptide self-assembly during electrospinning while the solvent is evaporating and the fibres are forming.
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Affiliation(s)
- Robabeh Gharaei
- Nonwovens Research Group
- School of Design
- University of Leeds
- Leeds LS2 9JT
- UK
| | - Giuseppe Tronci
- Nonwovens Research Group
- School of Design
- University of Leeds
- Leeds LS2 9JT
- UK
| | - Robert P. W. Davies
- Biomaterials and Tissue Engineering Research Group
- School of Dentistry
- St. James's University Hospital
- University of Leeds
- Leeds LS9 7TF
| | - Caroline Gough
- Division of Oral Biology
- School of Dentistry
- University of Leeds
- Leeds LS2 9JT
- UK
| | - Reem Alazragi
- Centre for Self-Organising Molecular Systems
- School of Chemistry
- University of Leeds
- Leeds LS2 9JT
- UK
| | - Parikshit Goswami
- Fibre and Fabric Functionalisation Research Group
- School of Design
- University of Leeds
- Leeds LS2 9JT
- UK
| | - Stephen J. Russell
- Nonwovens Research Group
- School of Design
- University of Leeds
- Leeds LS2 9JT
- UK
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41
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Du X, Zhou J, Shi J, Xu B. Supramolecular Hydrogelators and Hydrogels: From Soft Matter to Molecular Biomaterials. Chem Rev 2015; 115:13165-307. [PMID: 26646318 PMCID: PMC4936198 DOI: 10.1021/acs.chemrev.5b00299] [Citation(s) in RCA: 1239] [Impact Index Per Article: 137.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2015] [Indexed: 12/19/2022]
Abstract
In this review we intend to provide a relatively comprehensive summary of the work of supramolecular hydrogelators after 2004 and to put emphasis particularly on the applications of supramolecular hydrogels/hydrogelators as molecular biomaterials. After a brief introduction of methods for generating supramolecular hydrogels, we discuss supramolecular hydrogelators on the basis of their categories, such as small organic molecules, coordination complexes, peptides, nucleobases, and saccharides. Following molecular design, we focus on various potential applications of supramolecular hydrogels as molecular biomaterials, classified by their applications in cell cultures, tissue engineering, cell behavior, imaging, and unique applications of hydrogelators. Particularly, we discuss the applications of supramolecular hydrogelators after they form supramolecular assemblies but prior to reaching the critical gelation concentration because this subject is less explored but may hold equally great promise for helping address fundamental questions about the mechanisms or the consequences of the self-assembly of molecules, including low molecular weight ones. Finally, we provide a perspective on supramolecular hydrogelators. We hope that this review will serve as an updated introduction and reference for researchers who are interested in exploring supramolecular hydrogelators as molecular biomaterials for addressing the societal needs at various frontiers.
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Affiliation(s)
- Xuewen Du
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, Massachusetts 02454, United States
| | - Jie Zhou
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, Massachusetts 02454, United States
| | - Junfeng Shi
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, Massachusetts 02454, United States
| | - Bing Xu
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, Massachusetts 02454, United States
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42
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Erne PM, van Bezouwen LS, Štacko P, van Dijken DJ, Chen J, Stuart MCA, Boekema EJ, Feringa BL. Loading of Vesicles into Soft Amphiphilic Nanotubes using Osmosis. Angew Chem Int Ed Engl 2015; 54:15122-7. [PMID: 26503858 DOI: 10.1002/anie.201506493] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Revised: 08/17/2015] [Indexed: 11/12/2022]
Abstract
The facile assembly of higher-order nanoarchitectures from simple building blocks is demonstrated by the loading of vesicles into soft amphiphilic nanotubes using osmosis. The nanotubes are constructed from rigid interdigitated bilayers which are capped with vesicles comprising phospholipid-based flexible bilayers. When a hyperosmotic gradient is applied to these vesicle-capped nanotubes, the closed system loses water and the more flexible vesicle bilayer is pulled inwards. This leads to inclusion of vesicles inside the nanotubes without affecting the tube structure, showing controlled reorganization of the self-assembled multicomponent system upon a simple osmotic stimulus.
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Affiliation(s)
- Petra M Erne
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen (The Netherlands)
| | - Laura S van Bezouwen
- Electron Microscopy Group, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 7, 9747 AG Groningen (The Netherlands)
| | - Peter Štacko
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen (The Netherlands)
| | - Derk Jan van Dijken
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen (The Netherlands)
| | - Jiawen Chen
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen (The Netherlands)
| | - Marc C A Stuart
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen (The Netherlands).,Electron Microscopy Group, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 7, 9747 AG Groningen (The Netherlands)
| | - Egbert J Boekema
- Electron Microscopy Group, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 7, 9747 AG Groningen (The Netherlands)
| | - Ben L Feringa
- Centre for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen (The Netherlands).
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43
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Erne PM, van Bezouwen LS, Štacko P, van Dijken DJ, Chen J, Stuart MCA, Boekema EJ, Feringa BL. Loading of Vesicles into Soft Amphiphilic Nanotubes using Osmosis. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201506493] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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44
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Otsuka T, Maeda T, Hotta A. Effects of Salt Concentrations of the Aqueous Peptide-Amphiphile Solutions on the Sol–Gel Transitions, the Gelation Speed, and the Gel Characteristics. J Phys Chem B 2014; 118:11537-45. [DOI: 10.1021/jp5031569] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Takahiro Otsuka
- Department of Mechanical
Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Tomoki Maeda
- Department of Mechanical
Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Atsushi Hotta
- Department of Mechanical
Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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45
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Sustained and controlled release of lipophilic drugs from a self-assembling amphiphilic peptide hydrogel. Int J Pharm 2014; 474:103-11. [PMID: 25148727 DOI: 10.1016/j.ijpharm.2014.08.025] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2014] [Revised: 08/12/2014] [Accepted: 08/14/2014] [Indexed: 01/27/2023]
Abstract
Materials which undergo self-assembly to form supramolecular structures can provide alternative strategies to drug loading problems in controlled release application. RADA 16 is a simple and versatile self-assembling peptide with a designed structure formed of two distinct surfaces, one hydrophilic and one hydrophobic that are positioned in such a well-ordered fashion allowing precise assembly into a predetermined organization. A "smart" architecture in nanostructures can represent a good opportunity to use RADA16 as a carrier system for hydrophobic drugs solving problems of drugs delivery. In this work, we have investigated the diffusion properties of Pindolol, Quinine and Timolol maleate from RADA16 in PBS and in BSS-PLUS at 37°C. A sustained, controlled, reproducible and efficient drug release has been detected for all the systems, which allows to understand the dependence of release kinetics on the physicochemical characteristics of RADA16 structural and chemical properties of the selected drugs and the nature of solvents used. For the analysis various physicochemical characterization techniques were used in order to investigate the state of the peptide before and after the drugs were added. Not only does RADA16 optimise drug performance, but it can also provide a solution for drug delivery issues associated with lipophilic drugs.
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pH-controlled aggregation polymorphism of amyloidogenic Aβ(16-22): insights for obtaining peptide tapes and peptide nanotubes, as function of the N-terminal capping moiety. Eur J Med Chem 2014; 88:55-65. [PMID: 25087966 DOI: 10.1016/j.ejmech.2014.07.089] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Revised: 07/24/2014] [Accepted: 07/24/2014] [Indexed: 11/23/2022]
Abstract
Peptide and protein self-assembly resulting in the formation of amyloidogenic aggregates is generally thought of as a pathological event associated with severe diseases. However, amyloid formation may also provide a basis for advanced bionanomaterials, since amyloid fibrils combine unique material-like properties that make them very useful for design of new types of conducting nanowires, bioactive ligands, and biodegradable coatings as drug-encapsulating materials. The morphology of the supramolecular aggregates determines the properties and application range of these bionanomaterials. An important parameter to control the supramolecular morphology, is the overall charge of the peptide, which is related to the pH of the environment. Herein, we describe the design, synthesis and morphological analysis of a series of N-terminally functionalized Aβ(16-22) peptides (∼Lys-Leu-Val-Phe-Phe-Ala-Glu-OH), that underwent a pH-induced polymorphism, ranging from lamellar sheets, helical tapes, peptide nanotubes, and amyloid fibrils as was observed by transmission electron microscopy. Infrared spectroscopy and wide angle X-ray scattering studies showed that peptide self-assembly was driven by β-sheet formation, and that the supramolecular morphology was directed by subtle variations in electrostatic interactions. Finally, a structural model and hierarchy of self-assembly of a peptide nanotube, assembled at pH 1, is proposed.
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47
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Szkolar L, Guilbaud JB, Miller AF, Gough JE, Saiani A. Enzymatically triggered peptide hydrogels for 3D cell encapsulation and culture. J Pept Sci 2014; 20:578-84. [DOI: 10.1002/psc.2666] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 05/12/2014] [Accepted: 05/15/2014] [Indexed: 11/06/2022]
Affiliation(s)
- Laura Szkolar
- School of Materials; The University of Manchester; Manchester M13 9PL UK
- Manchester Institute of Biotechnology; The University of Manchester; Manchester M13 9PL UK
| | - Jean-Baptiste Guilbaud
- School of Chemical Engineering and Analytical Sciences; The University of Manchester; Manchester M13 9PL UK
- Manchester Institute of Biotechnology; The University of Manchester; Manchester M13 9PL UK
| | - Aline F. Miller
- School of Chemical Engineering and Analytical Sciences; The University of Manchester; Manchester M13 9PL UK
- Manchester Institute of Biotechnology; The University of Manchester; Manchester M13 9PL UK
| | - Julie E. Gough
- School of Materials; The University of Manchester; Manchester M13 9PL UK
| | - Alberto Saiani
- School of Materials; The University of Manchester; Manchester M13 9PL UK
- Manchester Institute of Biotechnology; The University of Manchester; Manchester M13 9PL UK
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48
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Abstract
Nature produces an array of self-assembled fibres from proteins and peptides with a wide range of functionalities. This has inspired scientists to design peptides that exploit specific protein folds to form simple yet multi-functional self-assembled fibres. Of the various protein folds the most commonly used has been the β-sheet fold as it is easily accessible and produces nanoscale fibres which have a wide range of stabilities. Research has also been driven by the relationship to the various amyloid diseases, which produce β-sheet rich fibres. Here we will discuss the use of natural protein sequences as the basis of peptides that self-assemble to β-sheet rich fibres followed by peptide sequences that have been designed de novo purely based on the rules for the formation of a β-sheet. How changes in the amino acid sequence of these various peptides affects the properties of the fibres and also the macroscopic materials formed by these peptides will be discussed in each case. We will then look into how these structures have been utilized for applications as scaffolds for cell culture and tissue regeneration, followed by their use in the nanotechnology field.
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49
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Maude S, Ingham E, Aggeli A. Biomimetic self-assembling peptides as scaffolds for soft tissue engineering. Nanomedicine (Lond) 2013; 8:823-47. [DOI: 10.2217/nnm.13.65] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Tissue engineered therapies are emerging as solutions to several of the medical challenges facing aging societies. To this end, a fundamental research goal is the development of novel biocompatible materials and scaffolds. Self-assembling peptides are materials that have undergone rapid development in the last two decades and they hold promise in meeting some of these challenges. Using amino acids as building blocks enables a great versatility to be incorporated into the structures that peptides form, their physical properties and their interactions with biological systems. This review discusses several classes of short self-assembling sequences, explaining the principles that drive their self-assembly into structures with nanoscale ordering, and highlighting in vitro and in vivo studies that demonstrate the potential of these materials as novel soft tissue engineering scaffolds.
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Affiliation(s)
- Steven Maude
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK
| | - Eileen Ingham
- The Institute of Medical & Biological Engineering, University of Leeds, Leeds, LS2 9JT, UK
| | - Amalia Aggeli
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK.
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50
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Wang Q, Yu J, Zheng J, Liu D, Jiang F, Zhang X, Li W. Morphology-controlled synthesis of silica materials templated by self-assembled short amphiphilic peptides. RSC Adv 2013. [DOI: 10.1039/c3ra42183j] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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