23 results on '"Jayawarna V"'
Search Results
2. Self-assembling peptide hydrogels : directing cell behaviour by chemical composition
- Author
-
Jayawarna, V., Richardson, S. M., Gough, J., and Ulijn, R.
- Subjects
QD - Abstract
Over recent years, there has been a growing interest in the design of self-assembly systems using aromatic short peptide derivatives for biomedical applications including 3D cell culture. We previously demonstrated that these peptides derivatives self-assemble into stiff nano structural hydrogels with tunable properties( Jayawarna V., et al., Adv.Mater.18(2006). These materials have already shown to be successful in cell culture of chondrocytes, they have not been tested for other cell types. Initial testing of the Fmoc-Phe-Phe-OH with skin cells such as human dermal fibroblasts and Mouse 3T3 cells highlighted some limitations and some development areas in terms of long term gel performance, stability and applications. The objective of this paper therefore is to investigate the design and the development potential of a series of peptide hydrogel systems of different chemical compositions were achieved through mixing Fmoc-Phe-Phe-OH with positively changed (Lysine), uncharged/polar (Serine) and negatively charged (Glutamic acid) Fmoc amino acids. The propensity of these hydrogel systems to promote proliferation, survival and proliferation of chondrocytes, 3T3 and HDF cells have also been tested. In addition methods were developed to form gels rapidly upon expose to culture media for both 2D and 3D cell culture applications. Hydrogels were characterised using FTIR and TEM. The results suggest that these peptide systems undergo spontaneous assembly into nanofibre scaffolds by mainly adopting an antiparallel b-sheet conformation. Both 2D and 3D cell culture analysis shows that these new hydrogels give rise to improved culturing of different cell types with respect to the Fmoc-Phe-Phe-OH hydrogel.
- Published
- 2008
3. Three-dimensional cell culture of chondrocytes on modified di-phenylalanine scaffolds
- Author
-
Jayawarna, V., primary, Smith, A., additional, Gough, J.E., additional, and Ulijn, R.V., additional
- Published
- 2007
- Full Text
- View/download PDF
4. Nanostructured Hydrogels for Three-Dimensional Cell Culture Through Self-Assembly of Fluorenylmethoxycarbonyl–Dipeptides
- Author
-
Jayawarna, V., primary, Ali, M., additional, Jowitt, T. A., additional, Miller, A. F., additional, Saiani, A., additional, Gough, J. E., additional, and Ulijn, R. V., additional
- Published
- 2006
- Full Text
- View/download PDF
5. Working Together: The Combined Application of a Magnetic Field and Penetratin for the Delivery of Magnetic Nanoparticles to Cells in 3D
- Author
-
Jesús M. de la Fuente, Margaret Mullen, Catherine C. Berry, David Stirling, Pablo del Pino, Colin Nixon, Vineetha Jayawarna, Hannah W. Child, Gordon M. McPhee, Andrew Hursthouse, Child, HW, Del Pino, PA, De La Fuente, JM, Hursthouse, AS, Stirling, D, Mullen, Margaret, McPhee, Gordon, Nixon, Colin, Jayawarna, V, and Berry, C
- Subjects
3D culture ,magnetic nanoparticles ,Materials science ,Cell Culture Techniques ,collagen gel ,General Physics and Astronomy ,Nanoparticle ,cell penetrating peptides ,magnetic field ,Nanotechnology ,Cell-Penetrating Peptides ,Gene delivery ,Ferric Compounds ,Mass Spectrometry ,In vivo ,Fluorescence microscope ,Humans ,General Materials Science ,Inductively coupled plasma mass spectrometry ,Drug Carriers ,Microscopy ,General Engineering ,cellular uptake ,Biological Transport ,Fibroblasts ,Extracellular Matrix ,Magnetic Fields ,Drug delivery ,Nanoparticles ,Magnetic nanoparticles ,Surface modification ,Carrier Proteins ,Rheology - Abstract
Nanoparticles (NPs) are currently being developed as vehicles for in vivo drug delivery. Two of the biggest barriers facing this therapy are the site-specific targeting and consequent cellular uptake of drug-loaded NPs 1. In vitro studies in 2D cell cultures have shown that an external magnetic field (MF) and functionalization with cell-penetrating peptides (CPPs) have the capacity to overcome these barriers. This study aimed to investigate if the potential of these techniques, which has been reported in 2D, can be successfully applied to cells growing in a 3D environment. As such, this study provides a more realistic assessment of how these techniques might perform in future clinical settings. The effect of a MF and/or penetratin attachment on the uptake of 100 and 200 nm fluorescent iron oxide magnetic NPs (mNPs) into a fibroblast-seeded 3D collagen gel was quantified by inductively coupled plasma mass spectrometry. The most suitable mNP species was further investigated by fluorescence microscopy, histology, confocal microscopy, and TEM. Results show that gel mNP uptake occurred on average twice as fast in the presence of a MF and up to three times faster with penetratin attachment. In addition, a MF increased the distance of mNP travel through the gel, while penetratin increased mNP cell localization. This work is one of the first to demonstrate that MFs and CPPs can be effectively translated for use in 3D systems and, if applied together, will make excellent partners to achieve therapeutic drug delivery in vivo Refereed/Peer-reviewed
- Published
- 2011
6. Nanotopography Influences Host-Pathogen Quorum Sensing and Facilitates Selection of Bioactive Metabolites in Mesenchymal Stromal Cells and Pseudomonas aeruginosa Co-Cultures.
- Author
-
Cuahtecontzi Delint R, Ishak MI, Tsimbouri PM, Jayawarna V, Burgess KVE, Ramage G, Nobbs AH, Damiati L, Salmeron-Sanchez M, Su B, and Dalby MJ
- Subjects
- Humans, Host-Pathogen Interactions, Nanostructures chemistry, Pseudomonas aeruginosa physiology, Pseudomonas aeruginosa drug effects, Mesenchymal Stem Cells metabolism, Mesenchymal Stem Cells cytology, Quorum Sensing drug effects, Biofilms drug effects, Coculture Techniques
- Abstract
Orthopedic implant-related bacterial infections and resultant antibiotic-resistant biofilms hinder implant-tissue integration and failure. Biofilm quorum sensing (QS) communication determines the pathogen colonization success. However, it remains unclear how implant modifications and host cells are influenced by, or influence, QS. High aspect ratio nanotopographies have shown to reduce biofilm formation of Pseudomonas aeruginosa , a sepsis causing pathogen with well-defined QS molecules. Producing such nanotopographies in relevant orthopedic materials (i.e., titanium) allows for probing QS using mass spectrometry-based metabolomics. However, nanotopographies can reduce host cell adhesion and regeneration. Therefore, we developed a polymer (poly(ethyl acrylate), PEA) coating that organizes extracellular matrix proteins, promoting bioactivity to host cells such as human mesenchymal stromal cells (hMSCs), maintaining biofilm reduction. This allowed us to investigate how hMSCs, after winning the race for the surface against pathogenic cells, interact with the biofilm. Our approach revealed that nanotopographies reduced major virulence pathways, such as LasR. The enhanced hMSCs support provided by the coated nanotopographies was shown to suppress virulence pathways and biofilm formation. Finally, we selected bioactive metabolites and demonstrated that these could be used as adjuncts to the nanostructured surfaces to reduce biofilm formation and enhance hMSC activity. These surfaces make excellent models to study hMSC-pathogen interactions and could be envisaged for use in novel orthopedic implants.
- Published
- 2024
- Full Text
- View/download PDF
7. Hybrid Micro-/Nanoprotein Platform Provides Endocrine-like and Extracellular Matrix-like Cell Delivery of Growth Factors.
- Author
-
López-Laguna H, Tsimbouri PM, Jayawarna V, Rigou I, Serna N, Voltà-Durán E, Unzueta U, Salmeron-Sanchez M, Vázquez E, Dalby MJ, and Villaverde A
- Subjects
- Humans, Fibroblast Growth Factor 2 chemistry, Fibroblast Growth Factor 2 pharmacology, Cell Proliferation drug effects, Cell Differentiation drug effects, Nanostructures chemistry, Mesenchymal Stem Cells cytology, Mesenchymal Stem Cells metabolism, Mesenchymal Stem Cells drug effects, Extracellular Matrix chemistry, Extracellular Matrix metabolism, Fibronectins chemistry
- Abstract
Protein materials are versatile tools in diverse biomedical fields. Among them, artificial secretory granules (SGs), mimicking those from the endocrine system, act as mechanically stable reservoirs for the sustained release of proteins as oligomeric functional nanoparticles. Only validated in oncology, the physicochemical properties of SGs, along with their combined drug-releasing and scaffolding abilities, make them suitable as smart topographies in regenerative medicine for the prolonged delivery of growth factors (GFs). Thus, considering the need for novel, safe, and cost-effective materials to present GFs, in this study, we aimed to biofabricate a protein platform combining both endocrine-like and extracellular matrix fibronectin-derived (ECM-FN) systems. This approach is based on the sustained delivery of a nanostructured histidine-tagged version of human fibroblast growth factor 2. The GF is presented onto polymeric surfaces, interacting with FN to spontaneously generate nanonetworks that absorb and present the GF in the solid state, to modulate mesenchymal stromal cell (MSC) behavior. The results show that SGs-based topographies trigger high rates of MSCs proliferation while preventing differentiation. While this could be useful in cell therapy manufacture demanding large numbers of unspecialized MSCs, it fully validates the hybrid platform as a convenient setup for the design of biologically active hybrid surfaces and in tissue engineering for the controlled manipulation of mammalian cell growth.
- Published
- 2024
- Full Text
- View/download PDF
8. Bioinspired mineralization of engineered living materials to promote osteogenic differentiation.
- Author
-
Parra-Torrejón B, Jayawarna V, Rodrigo-Navarro A, Gonzalez-Valdivieso J, Dobre O, Ramírez-Rodríguez GB, Salmeron-Sanchez M, and Delgado-López JM
- Subjects
- Humans, Osteogenesis genetics, Tissue Scaffolds chemistry, Alginates, Cell Differentiation, Mesenchymal Stem Cells metabolism, Calcinosis metabolism
- Abstract
In this work, Engineered Living Materials (ELMs), based on the combination of genetically-modified bacteria and mineral-reinforced organic matrices, and endowed with self-healing or regenerative properties and adaptation to specific biological environments were developed. Concretely, we produced ELMs combining human mesenchymal stem cells (hMSCs) and Lactococcus lactis (L. lactis), which was specifically programmed to deliver bone morphogenetic protein (BMP-2) upon external stimulation using nisin, into mineralized alginate matrices. The hybrid organic/inorganic matrix was built through a protocol, inspired by bone mineralization, in which alginate (Alg) assembly and apatite (HA) mineralization occurred simultaneously driven by calcium ions. Chemical composition, structure and reologhical properties of the hybrid 3D matrices were dedicately optimized prior the incorportation of the living entities. Then, the same protocol was reproduced in the presence of hMSC and engineered L. lactis that secrete BMP-2 resulting in 3D hybrid living hydrogels. hMSC viability and osteogenic differentiation in the absence and presence of the bacteria were evaluated by live/dead and quantitative real-time polymerase chain reaction (qPCR) and immunofluorescence assays, respectively. Results demonstrate that these 3D engineered living material support osteogenic differentiation of hMSCs due to the synergistic effect between HA and the growth factors BMP-2 delivered by L. lactis., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 The Authors. Published by Elsevier B.V. All rights reserved.)
- Published
- 2023
- Full Text
- View/download PDF
9. An engineered periosteum for efficient delivery of rhBMP-2 and mesenchymal progenitor cells during bone regeneration.
- Author
-
Romero-Torrecilla JA, Lamo-Espinosa JM, Ripalda-Cemboráin P, López-Martínez T, Abizanda G, Riera-Álvarez L, de Galarreta-Moriones SR, López-Barberena A, Rodríguez-Flórez N, Elizalde R, Jayawarna V, Valdés-Fernández J, de Anleo ME, Childs P, de Juan-Pardo E, Salmeron-Sanchez M, Prósper F, Muiños-López E, and Granero-Moltó F
- Abstract
During bone regeneration, the periosteum acts as a carrier for key regenerative cues, delivering osteochondroprogenitor cells and crucial growth factors to the injured bone. We developed a biocompatible, 3D polycaprolactone (PCL) melt electro-written membrane to act as a mimetic periosteum. Poly (ethyl acrylate) coating of the PCL membrane allowed functionalization, mediated by fibronectin and low dose recombinant human BMP-2 (rhBMP-2) (10-25 μg/ml), resulting in efficient, sustained osteoinduction in vitro. In vivo, rhBMP-2 functionalized mimetic periosteum demonstrated regenerative potential in the treatment of rat critical-size femoral defects with highly efficient healing and functional recovery (80%-93%). Mimetic periosteum has also proven to be efficient for cell delivery, as observed through the migration of transplanted periosteum-derived mesenchymal cells to the bone defect and their survival. Ultimately, mimetic periosteum demonstrated its ability to deliver key stem cells and morphogens to an injured site, exposing a therapeutic and translational potential in vivo when combined with unprecedentedly low rhBMP-2 doses., (© 2023. Springer Nature Limited.)
- Published
- 2023
- Full Text
- View/download PDF
10. Keeping It Organized: Multicompartment Constructs to Mimic Tissue Heterogeneity.
- Author
-
Sanchez-Rubio A, Jayawarna V, Maxwell E, Dalby MJ, and Salmeron-Sanchez M
- Subjects
- Hydrogels chemistry, Tissue Engineering methods, Biocompatible Materials chemistry, Tissue Scaffolds chemistry, Printing, Three-Dimensional, Bioprinting
- Abstract
Tissue engineering aims at replicating tissues and organs to develop applications in vivo and in vitro. In vivo, by engineering artificial constructs using functional materials and cells to provide both physiological form and function. In vitro, by engineering three-dimensional (3D) models to support drug discovery and enable understanding of fundamental biology. 3D culture constructs mimic cell-cell and cell-matrix interactions and use biomaterials seeking to increase the resemblance of engineered tissues with its in vivo homologues. Native tissues, however, include complex architectures, with compartmentalized regions of different properties containing different types of cells that can be captured by multicompartment constructs. Recent advances in fabrication technologies, such as micropatterning, microfluidics or 3D bioprinting, have enabled compartmentalized structures with defined compositions and properties that are essential in creating 3D cell-laden multiphasic complex architectures. This review focuses on advances in engineered multicompartment constructs that mimic tissue heterogeneity. It includes multiphasic 3D implantable scaffolds and in vitro models, including systems that incorporate different regions emulating in vivo tissues, highlighting the emergence and relevance of 3D bioprinting in the future of biological research and medicine., (© 2023 The Authors. Advanced Healthcare Materials published by Wiley-VCH GmbH.)
- Published
- 2023
- Full Text
- View/download PDF
11. Nanotopography reveals metabolites that maintain the immunomodulatory phenotype of mesenchymal stromal cells.
- Author
-
Ross EA, Turner LA, Donnelly H, Saeed A, Tsimbouri MP, Burgess KV, Blackburn G, Jayawarna V, Xiao Y, Oliva MAG, Willis J, Bansal J, Reynolds P, Wells JA, Mountford J, Vassalli M, Gadegaard N, Oreffo ROC, Salmeron-Sanchez M, and Dalby MJ
- Subjects
- Multipotent Stem Cells metabolism, Cell Differentiation, Immunomodulation, Phenotype, Mesenchymal Stem Cells metabolism
- Abstract
Mesenchymal stromal cells (MSCs) are multipotent progenitor cells that are of considerable clinical potential in transplantation and anti-inflammatory therapies due to their capacity for tissue repair and immunomodulation. However, MSCs rapidly differentiate once in culture, making their large-scale expansion for use in immunomodulatory therapies challenging. Although the differentiation mechanisms of MSCs have been extensively investigated using materials, little is known about how materials can influence paracrine activities of MSCs. Here, we show that nanotopography can control the immunomodulatory capacity of MSCs through decreased intracellular tension and increasing oxidative glycolysis. We use nanotopography to identify bioactive metabolites that modulate intracellular tension, growth and immunomodulatory phenotype of MSCs in standard culture and during larger scale cell manufacture. Our findings demonstrate an effective route to support large-scale expansion of functional MSCs for therapeutic purposes., (© 2023. The Author(s).)
- Published
- 2023
- Full Text
- View/download PDF
12. Material-driven fibronectin and vitronectin assembly enhances BMP-2 presentation and osteogenesis.
- Author
-
Xiao Y, Donnelly H, Sprott M, Luo J, Jayawarna V, Lemgruber L, Tsimbouri PM, Meek RMD, Salmeron-Sanchez M, and Dalby MJ
- Abstract
Mesenchymal stem cell (MSC)-based tissue engineering strategies are of interest in the field of bone tissue regenerative medicine. MSCs are commonly investigated in combination with growth factors (GFs) and biomaterials to provide a regenerative environment for the cells. However, optimizing how biomaterials interact with MSCs and efficiently deliver GFs, remains a challenge. Here, via plasma polymerization, tissue culture plates are coated with a layer of poly (ethyl acrylate) (PEA), which is able to spontaneously permit fibronectin (FN) to form fibrillar nanonetworks. However, vitronectin (VN), another important extracellular matrix (ECM) protein forms multimeric globules on the polymer, thus not displaying functional groups to cells. Interestingly, when FN and VN are co-absorbed onto PEA surfaces, VN can be entrapped within the FN fibrillar nanonetwork in the monomeric form providing a heterogeneous, open ECM network. The combination of FN and VN promote MSC adhesion and leads to enhanced GF binding; here we demonstrate this with bone morphogenetic protein-2 (BMP2). Moreover, MSC differentiation into osteoblasts is enhanced, with elevated expression of osteopontin (OPN) and osteocalcin (OCN) quantified by immunostaining, and increased mineralization observed by von Kossa staining. Osteogenic intracellular signalling is also induced, with increased activity in the SMAD pathway. The study emphasizes the need of recapitulating the complexity of native ECM to achieve optimal cell-material interactions., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2022 The Authors.)
- Published
- 2022
- Full Text
- View/download PDF
13. Materials-driven fibronectin assembly on nanoscale topography enhances mesenchymal stem cell adhesion, protecting cells from bacterial virulence factors and preventing biofilm formation.
- Author
-
Damiati LA, Tsimbouri MP, Hernandez VL, Jayawarna V, Ginty M, Childs P, Xiao Y, Burgess K, Wells J, Sprott MR, Meek RMD, Li P, Oreffo ROC, Nobbs A, Ramage G, Su B, Salmeron-Sanchez M, and Dalby MJ
- Subjects
- Bacterial Adhesion, Biofilms, Cell Adhesion, Cell Differentiation, Humans, Osteogenesis, Virulence Factors metabolism, Fibronectins metabolism, Mesenchymal Stem Cells
- Abstract
Post-operative infection is a major complication in patients recovering from orthopaedic surgery. As such, there is a clinical need to develop biomaterials for use in regenerative surgery that can promote mesenchymal stem cell (MSC) osteospecific differentiation and that can prevent infection caused by biofilm-forming pathogens. Nanotopographical approaches to pathogen control are being identified, including in orthopaedic materials such as titanium and its alloys. These topographies use high aspect ratio nanospikes or nanowires to prevent bacterial adhesion but these features also significantly reduce MSC adhesion and activity. Here, we use a poly (ethyl acrylate) (PEA) polymer coating on titanium nanowires to spontaneously organise fibronectin (FN) and to deliver bone morphogenetic protein 2 (BMP2) to enhance MSC adhesion and osteospecific signalling. Using a novel MSC-Pseudomonas aeruginosa co-culture, we show that the coated nanotopographies protect MSCs from cytotoxic quorum sensing and signalling molecules, enhance MSC adhesion and osteoblast differentiation and reduce biofilm formation. We conclude that the PEA polymer-coated nanotopography can both support MSCs and prevent pathogens from adhering to a biomaterial surface, thus protecting from biofilm formation and bacterial infection, and supporting osteogenic repair., (Copyright © 2021. Published by Elsevier Ltd.)
- Published
- 2022
- Full Text
- View/download PDF
14. Plasma polymerised nanoscale coatings of controlled thickness for efficient solid-phase presentation of growth factors.
- Author
-
Alba-Perez A, Jayawarna V, Childs PG, Dalby MJ, and Salmeron-Sanchez M
- Subjects
- Adsorption, Bone Morphogenetic Protein 2 chemistry, Cell Adhesion drug effects, Cell Differentiation drug effects, Cells, Cultured, Coated Materials, Biocompatible pharmacology, Fibronectins chemistry, Humans, Mesenchymal Stem Cells cytology, Mesenchymal Stem Cells metabolism, Osteogenesis drug effects, Surface Properties, Acrylic Resins chemistry, Coated Materials, Biocompatible chemistry, Intercellular Signaling Peptides and Proteins chemistry, Nanotechnology, Plasma Gases chemistry
- Abstract
The engineering of biomaterial surfaces and scaffolds for specific biomedical and clinical application is of growing interest. Certain functionalised surfaces can capture and deliver bioactive molecules, such as growth factors (GF), enhancing the clinical efficacy of such systems. With a custom-made plasma polymerisation reactor described here we have developed bioactive polymer coatings based on poly(ethyl acrylate) (PEA). This remarkable polymer unfolds fibronectin (FN) upon adsorption to allow the GF binding region of FN to sequester and present GFs with high efficiency. We systematically evaluate process conditions and their impact on plasma polymerised PEA coatings and characterise the effect of plasma power and deposition time on thickness, wettability and chemical composition of the coatings. We demonstrate that functional substrate roughness can be maintained after deposition of the polymer coatings. Importantly, we show that coatings deposited at different conditions all maintain a similar or better bioactivity than spin coated PEA references. We show that in PEA plasma polymerised coatings FN assembles into nanonetworks with high availability of integrin and GF binding regions that sequester bone morphogenetic protein-2 (BMP-2). We also report similar mesenchymal stem cell adhesion behaviour, as characterised by focal adhesions, and differentiation potential on BMP-2 coated surfaces, regardless of plasma deposition conditions. This is a potent and versatile technology that can help facilitate the use of GFs in clinical applications., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2020 The Authors. Published by Elsevier B.V. All rights reserved.)
- Published
- 2020
- Full Text
- View/download PDF
15. Nanoscale Coatings for Ultralow Dose BMP-2-Driven Regeneration of Critical-Sized Bone Defects.
- Author
-
Cheng ZA, Alba-Perez A, Gonzalez-Garcia C, Donnelly H, Llopis-Hernandez V, Jayawarna V, Childs P, Shields DW, Cantini M, Ruiz-Cantu L, Reid A, Windmill JFC, Addison ES, Corr S, Marshall WG, Dalby MJ, and Salmeron-Sanchez M
- Abstract
While new biomaterials for regenerative therapies are being reported in the literature, clinical translation is slow. Some existing regenerative approaches rely on high doses of growth factors, such as bone morphogenetic protein-2 (BMP-2) in bone regeneration, which can cause serious side effects. An ultralow-dose growth factor technology is described yielding high bioactivity based on a simple polymer, poly(ethyl acrylate) (PEA), and mechanisms to drive stem cell differentiation and bone regeneration in a critical-sized murine defect model with translation to a clinical veterinary setting are reported. This material-based technology triggers spontaneous fibronectin organization and stimulates growth factor signalling, enabling synergistic integrin and BMP-2 receptor activation in mesenchymal stem cells. To translate this technology, plasma-polymerized PEA is used on 2D and 3D substrates to enhance cell signalling in vitro, showing the complete healing of a critical-sized bone injury in mice in vivo. Efficacy is demonstrated in a Münsterländer dog with a nonhealing humerus fracture, establishing the clinical translation of advanced ultralow-dose growth factor treatment.
- Published
- 2018
- Full Text
- View/download PDF
16. Biogelx: Cell Culture on Self-Assembling Peptide Gels.
- Author
-
Harper MM, Connolly ML, Goldie L, Irvine EJ, Shaw JE, Jayawarna V, Richardson SM, Dalby MJ, Lightbody D, and Ulijn RV
- Subjects
- Biocompatible Materials chemistry, Cell Culture Techniques, Hydrogels isolation & purification, Microscopy, Peptides isolation & purification, Spheroids, Cellular, Hydrogels chemistry, Peptides chemistry, Protein Multimerization
- Abstract
Aromatic peptide amphiphiles can form self-supporting nanostructured hydrogels with tunable mechanical properties and chemical compositions. These hydrogels are increasingly applied in two-dimensional (2D) and three-dimensional (3D) cell culture, where there is a rapidly growing need to store, grow, proliferate, and manipulate naturally derived cells within a hydrated, 3D matrix. Biogelx Limited is a biomaterials company, created to commercialize these bio-inspired hydrogels to cell biologists for a range of cell culture applications. This chapter describes methods of various characterization and cell culture techniques specifically optimized for compatibility with Biogelx products.
- Published
- 2018
- Full Text
- View/download PDF
17. Publisher Correction: Stimulation of 3D osteogenesis by mesenchymal stem cells using a nanovibrational bioreactor.
- Author
-
Tsimbouri PM, Childs PG, Pemberton GD, Yang J, Jayawarna V, Orapiriyakul W, Burgess K, González-García C, Blackburn G, Thomas D, Vallejo-Giraldo C, Biggs MJP, Curtis ASG, Salmerón-Sánchez M, Reid S, and Dalby MJ
- Abstract
In the version of this Article originally published, in Fig. 4f, the asterisk was missing; in Fig. 6a-c, the labels 'Wnt/β-catenin signalling', 'Wnt/Ca
+ pathway' and 'ERK' and their associated lines/arrows were missing; and in Fig. 6d and in the sentence beginning "In MSCs that were...", 'myosin' and 'nanostimulated', respectively, were spelt incorrectly. These errors have now been corrected in all versions of the Article.- Published
- 2017
- Full Text
- View/download PDF
18. Stimulation of 3D osteogenesis by mesenchymal stem cells using a nanovibrational bioreactor.
- Author
-
Tsimbouri PM, Childs PG, Pemberton GD, Yang J, Jayawarna V, Orapiriyakul W, Burgess K, González-García C, Blackburn G, Thomas D, Vallejo-Giraldo C, Biggs MJP, Curtis ASG, Salmerón-Sánchez M, Reid S, and Dalby MJ
- Abstract
Bone grafts are one of the most commonly transplanted tissues. However, autologous grafts are in short supply, and can be associated with pain and donor-site morbidity. The creation of tissue-engineered bone grafts could help to fulfil clinical demand and provide a crucial resource for drug screening. Here, we show that vibrations of nanoscale amplitude provided by a newly developed bioreactor can differentiate a potential autologous cell source, mesenchymal stem cells (MSCs), into mineralized tissue in 3D. We demonstrate that nanoscale mechanotransduction can stimulate osteogenesis independently of other environmental factors, such as matrix rigidity. We show this by generating mineralized matrix from MSCs seeded in collagen gels with stiffness an order of magnitude below the stiffness of gels needed to induce bone formation in vitro. Our approach is scalable and can be compatible with 3D scaffolds.
- Published
- 2017
- Full Text
- View/download PDF
19. Improving cartilage phenotype from differentiated pericytes in tunable peptide hydrogels.
- Author
-
Alakpa EV, Jayawarna V, Burgess KEV, West CC, Péault B, Ulijn RV, and Dalby MJ
- Subjects
- Adipose Tissue metabolism, Biomarkers, Cell Differentiation, Cells, Cultured, Chondrocytes metabolism, Chondrogenesis, Collagen Type II metabolism, Dipeptides, Humans, Hydrogels chemistry, Metabolomics, Pericytes metabolism, Phenotype, Phenylalanine analogs & derivatives, Phenylalanine chemistry, Tissue Engineering methods, Adipose Tissue cytology, Chondrocytes cytology, Peptides chemistry, Pericytes cytology
- Abstract
Differentiation of stem cells to chondrocytes in vitro usually results in a heterogeneous phenotype. This is evident in the often detected over expression of type X collagen which, in hyaline cartilage structure is not characteristic of the mid-zone but of the deep-zone ossifying tissue. Methods to better match cartilage developed in vitro to characteristic in vivo features are therefore highly desirable in regenerative medicine. This study compares phenotype characteristics between pericytes, obtained from human adipose tissue, differentiated using diphenylalanine/serine (F
2 /S) peptide hydrogels with the more widely used chemical induced method for chondrogenesis. Significantly higher levels of type II collagen were noted when pericytes undergo chondrogenesis in the hydrogel in the absence of induction media. There is also a balanced expression of collagen relative to aggrecan production, a feature which was biased toward collagen production when cells were cultured with induction media. Lastly, metabolic profiles of each system show considerable overlap between both differentiation methods but subtle differences which potentially give rise to their resultant phenotype can be ascertained. The study highlights how material and chemical alterations in the cellular microenvironment have wide ranging effects on resultant tissue type.- Published
- 2017
- Full Text
- View/download PDF
20. Biocatalytically triggered co-assembly of two-component core/shell nanofibers.
- Author
-
Abul-Haija YM, Roy S, Frederix PW, Javid N, Jayawarna V, and Ulijn RV
- Subjects
- Alkaline Phosphatase metabolism, Chromatography, High Pressure Liquid, Nanofibers ultrastructure, Oligopeptides chemistry, Spectrometry, Fluorescence, Static Electricity, Surface-Active Agents chemistry, Biocatalysis, Nanofibers chemistry
- Abstract
For the development of applications and novel uses for peptide nanostructures, robust routes for their surface functionalization, that ideally do not interfere with their self-assembly properties, are required. Many existing methods rely on covalent functionalization, where building blocks are appended with functional groups, either pre- or post-assembly. A facile supramolecular approach is demonstrated for the formation of functionalized nanofibers by combining the advantages of biocatalytic self-assembly and surfactant/gelator co-assembly. This is achieved by enzymatically triggered reconfiguration of free flowing micellar aggregates of pre-gelators and functional surfactants to form nanofibers that incorporate and display the surfactants' functionality at the surface. Furthermore, by varying enzyme concentration, the gel stiffness and supramolecular organization of building blocks can be varied., (© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
- Published
- 2014
- Full Text
- View/download PDF
21. Working together: the combined application of a magnetic field and penetratin for the delivery of magnetic nanoparticles to cells in 3D.
- Author
-
Child HW, Del Pino PA, De La Fuente JM, Hursthouse AS, Stirling D, Mullen M, McPhee GM, Nixon C, Jayawarna V, and Berry CC
- Subjects
- Biological Transport, Cell-Penetrating Peptides, Extracellular Matrix metabolism, Fibroblasts cytology, Fibroblasts metabolism, Humans, Mass Spectrometry, Microscopy, Rheology, Carrier Proteins chemistry, Cell Culture Techniques methods, Drug Carriers chemistry, Drug Carriers metabolism, Ferric Compounds chemistry, Magnetic Fields, Nanoparticles chemistry
- Abstract
Nanoparticles (NPs) are currently being developed as vehicles for in vivo drug delivery. Two of the biggest barriers facing this therapy are the site-specific targeting and consequent cellular uptake of drug-loaded NPs(1). In vitro studies in 2D cell cultures have shown that an external magnetic field (MF) and functionalization with cell-penetrating peptides (CPPs) have the capacity to overcome these barriers. This study aimed to investigate if the potential of these techniques, which has been reported in 2D, can be successfully applied to cells growing in a 3D environment. As such, this study provides a more realistic assessment of how these techniques might perform in future clinical settings. The effect of a MF and/or penetratin attachment on the uptake of 100 and 200 nm fluorescent iron oxide magnetic NPs (mNPs) into a fibroblast-seeded 3D collagen gel was quantified by inductively coupled plasma mass spectrometry. The most suitable mNP species was further investigated by fluorescence microscopy, histology, confocal microscopy, and TEM. Results show that gel mNP uptake occurred on average twice as fast in the presence of a MF and up to three times faster with penetratin attachment. In addition, a MF increased the distance of mNP travel through the gel, while penetratin increased mNP cell localization. This work is one of the first to demonstrate that MFs and CPPs can be effectively translated for use in 3D systems and, if applied together, will make excellent partners to achieve therapeutic drug delivery in vivo.
- Published
- 2011
- Full Text
- View/download PDF
22. Introducing chemical functionality in Fmoc-peptide gels for cell culture.
- Author
-
Jayawarna V, Richardson SM, Hirst AR, Hodson NW, Saiani A, Gough JE, and Ulijn RV
- Subjects
- 3T3 Cells, Animals, Cattle, Cell Adhesion, Cell Proliferation, Cell Survival, Cells, Cultured, Chondrocytes, Cytoskeleton metabolism, DNA genetics, DNA ultrastructure, Dermis cytology, Elastic Modulus, Elasticity, Fibroblasts, Fluorenes chemistry, Glutamic Acid chemistry, Humans, Hydrogels chemistry, Hydrogen Bonding, Hydrogen-Ion Concentration, Lactate Dehydrogenases metabolism, Lysine chemistry, Mice, Nanostructures chemistry, Nanostructures ultrastructure, Plasmids genetics, Protein Structure, Secondary, Serine chemistry, Static Electricity, Tissue Scaffolds, Viscosity, Biocompatible Materials chemistry, DNA metabolism, Gene Transfer Techniques, Peptides chemistry
- Abstract
Aromatic short peptide derivatives, i.e. peptides modified with aromatic groups such as 9-fluorenylmethoxycarbonyl (Fmoc), can self-assemble into self-supporting hydrogels. These hydrogels have some similarities to extracellular matrices due to their high hydration, relative stiffness and nanofibrous architecture. We previously demonstrated that Fmoc-diphenylalanine (Fmoc-F(2)) provides a suitable matrix for two-dimensional (2D) or three-dimensional (3D) culture of primary bovine chondrocytes. In this paper we investigate whether the introduction of chemical functionality, such as NH(2), COOH or OH, enhances compatibility with different cell types. A series of hydrogel compositions consisting of combinations of Fmoc-F(2) and n-protected Fmoc amino acids, lysine (K, with side chain R=(CH(2))(4)NH(2)), glutamic acid (D, with side chain R=CH(2)COOH), and serine (S, with side chain R=CH(2)OH) were studied. All compositions produced fibrous scaffolds with fibre diameters in the range of 32-65 nm as assessed by cryo-scanning electron microscopy and atomic force microscopy. Fourier transform infrared spectroscopy analysis suggested that peptide segments adopt a predominantly antiparallel beta-sheet conformation. Oscillatory rheology results show that all four hydrogels have mechanical profiles of soft viscoelastic materials with elastic moduli dependent on the chemical composition, ranging from 502 Pa (Fmoc-F(2)/D) to 21.2 KPa (Fmoc-F(2)). All gels supported the viability of bovine chondrocytes as assessed by a live-dead staining assay. Fmoc-F(2)/S and Fmoc-F(2)/D hydrogels in addition supported viability for human dermal fibroblasts (HDF) while Fmoc-F(2)/S hydrogel was the only gel type that supported viability for all three cell types tested. Fmoc-F(2)/S was therefore investigated further by studying cell proliferation, cytoskeletal organization and histological analysis in 2D culture. In addition, the Fmoc-F(2)/S gel was shown to support retention of cell morphology in 3D culture of bovine chondrocytes. These results demonstrate that introduction of chemical functionality into Fmoc-peptide scaffolds may provide gels with tunable chemical and mechanical properties for in vitro cell culture.
- Published
- 2009
- Full Text
- View/download PDF
23. Enzyme-triggered self-assembly of peptide hydrogels via reversed hydrolysis.
- Author
-
Toledano S, Williams RJ, Jayawarna V, and Ulijn RV
- Subjects
- Amino Acids chemistry, Bacillus chemistry, Dipeptides chemical synthesis, Dipeptides chemistry, Fluorenes chemistry, Hydrolysis, Hydrophobic and Hydrophilic Interactions, Kinetics, Oligopeptides chemistry, Peptide Hydrolases chemistry, Thermolysin chemistry, Hydrogels chemistry, Oligopeptides chemical synthesis
- Abstract
We demonstrate that proteases can be used to selectively trigger the self-assembly of peptide hydrogels via reversed hydrolysis.
- Published
- 2006
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.