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Nascimento ATD, Mendes AX, Duchi S, Duc D, Aguilar LC, Quigley AF, Kapsa RMI, Nisbet DR, Stoddart PR, Silva SM, Moulton SE. Wired for Success: Probing the Effect of Tissue-Engineered Neural Interface Substrates on Cell Viability. ACS Biomater Sci Eng 2024. [PMID: 38722625 DOI: 10.1021/acsbiomaterials.4c00111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/15/2024]
Abstract
This study investigates the electrochemical behavior of GelMA-based hydrogels and their interactions with PC12 neural cells under electrical stimulation in the presence of conducting substrates. Focusing on indium tin oxide (ITO), platinum, and gold mylar substrates supporting conductive scaffolds composed of hydrogel, graphene oxide, and gold nanorods, we explored how the substrate materials affect scaffold conductivity and cell viability. We examined the impact of an optimized electrical stimulation protocol on the PC12 cell viability. According to our findings, substrate selection significantly influences conductive hydrogel behavior, affecting cell viability and proliferation as a result. In particular, the ITO substrates were found to provide the best support for cell viability with an average of at least three times higher metabolic activity compared to platinum and gold mylar substrates over a 7 day stimulation period. The study offers new insights into substrate selection as a platform for neural cell stimulation and underscores the critical role of substrate materials in optimizing the efficacy of neural interfaces for biomedical applications. In addition to extending existing work, this study provides a robust platform for future explorations aimed at tailoring the full potential of tissue-engineered neural interfaces.
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Affiliation(s)
- Adriana Teixeira do Nascimento
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Alexandre X Mendes
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Serena Duchi
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- Department of Surgery, University of Melbourne, St Vincent's Hospital, Melbourne, Victoria 3065, Australia
| | - Daniela Duc
- School of Pharmacy and Pharmaceutical Sciences, College of Biomedical and Life Sciences, Cardiff University, Cardiff CF10 3NB, United Kingdom
| | - Lilith C Aguilar
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- The Graeme Clark Institute, The University of Melbourne, Melbourne, Victoria 3010, Australia
- Department of Biomedical Engineering, Faculty of Engineering and Information Technology, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Anita F Quigley
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia
- Department of Medicine, University of Melbourne, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Robert M I Kapsa
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia
- Department of Medicine, University of Melbourne, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - David R Nisbet
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- The Graeme Clark Institute, The University of Melbourne, Melbourne, Victoria 3010, Australia
- Department of Biomedical Engineering, Faculty of Engineering and Information Technology, The University of Melbourne, Melbourne, Victoria 3010, Australia
- Melbourne Medical School, Faculty of Medicine, Dentistry and Health Science, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Paul R Stoddart
- School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Saimon M Silva
- Department of Chemistry and Biochemistry, La Trobe Institute for Molecular Science, The Biomedical and Environmental Sensor Technology Research Centre, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Simon E Moulton
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- Iverson Health Innovation Research Institute, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
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2
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Han M, Russo MJ, Desroches PE, Silva SM, Quigley AF, Kapsa RMI, Moulton SE, Greene GW. Calcium ions have a detrimental impact on the boundary lubrication property of hyaluronic acid and lubricin (PRG-4) both alone and in combination. Colloids Surf B Biointerfaces 2024; 234:113741. [PMID: 38184943 DOI: 10.1016/j.colsurfb.2023.113741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Revised: 12/26/2023] [Accepted: 12/28/2023] [Indexed: 01/09/2024]
Abstract
Cartilage demineralisation in Osteoarthritis (OA) patients can elevate calcium ion levels in synovial fluid, as evidenced by the prevalence of precipitated calcium phosphate crystals in OA synovial fluid. Although it has been reported that there is a potential connection between elevated concentrations of calcium ions and a deterioration in the lubrication and wear resistance of cartilage tissues, the mechanism behind the strong link between calcium ion concentration and decreased lubrication performance is unclear. In this work, the AFM friction, imaging, and normal force distance measurements were used to investigate the lubrication performances of hyaluronic acid (HA), Lubricin (LUB), and HA-LUB complex in the presence of calcium ions (5 mM, 15 mM, and 30 mM), to understand the possible mechanism behind the change of lubrication property. The results of AFM friction measurements suggest that introducing calcium ions to the environment effectively eliminated the lubrication ability of HA and HA-LUB, especially with relatively low loading applied. The AFM images indicate that it is unlikely that structural or morphological changes in the surface-bound layer upon calcium ions addition are primarily responsible for the friction results demonstrated. Further, the poor correlation between the effect of calcium ions on the adhesion forces and its impact on friction suggests that the decrease in the lubricating ability of both layers is likely a result of changes in the hydration of the HA-LUB surface bound layers than changes in intermolecular or intramolecular binding. This work provides the first experimental evidence lending towards the relationship between bone demineralisation and articular cartilage degradation at the onset of OA and the mechanism through which elevated calcium levels in the synovial fluid act on joint lubrication.
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Affiliation(s)
- Mingyu Han
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia; ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia; Commonwealth Scientific and Industrial Research Organisation (CSIRO), Agriculture and Food, 671 Sneydes Road, Private Bag 16, Werribee, Victoria 3030, Australia.
| | - Matthew J Russo
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia; Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, USA
| | - Pauline E Desroches
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia; ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Saimon M Silva
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Fitzroy, Victoria 3065, Australia; Iverson Health Innovation Research Institute, Swinburne University of Technology, Australia; Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, USA; Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Anita F Quigley
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia; School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia
| | - Robert M I Kapsa
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia; School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia
| | - Simon E Moulton
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia; The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Fitzroy, Victoria 3065, Australia; Iverson Health Innovation Research Institute, Swinburne University of Technology, Australia
| | - George W Greene
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia; ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia; Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia.
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3
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Han M, Silva SM, Russo MJ, Desroches PE, Lei W, Quigley AF, Kapsa RMI, Moulton SE, Stoddart PR, Greene GW. Lubricin (PRG-4) anti-fouling coating for surface-enhanced Raman spectroscopy biosensing: towards a hierarchical separation system for analysis of biofluids. Analyst 2023; 149:63-75. [PMID: 37933547 DOI: 10.1039/d3an00910f] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2023]
Abstract
Surface-enhanced Raman Spectroscopy (SERS) is a powerful optical sensing technique that amplifies the signal generated by Raman scattering by many orders of magnitude. Although the extreme sensitivity of SERS enables an extremely low limit of detection, even down to single molecule levels, it is also a primary limitation of the technique due to its tendency to equally amplify 'noise' generated by non-specifically adsorbed molecules at (or near) SERS-active interfaces. Eliminating interference noise is thus critically important to SERS biosensing and typically involves onerous extraction/purification/washing procedures and/or heavy dilution of biofluid samples. Consequently, direct analysis within biofluid samples or in vivo environments is practically impossible. In this study, an anti-fouling coating of recombinant human Lubricin (LUB) was self-assembled onto AuNP-modified glass slides via a simple drop-casting method. A series of Raman spectra were collected using rhodamine 6G (R6G) as a model analyte, which was spiked into NaCl solution or unprocessed whole blood. Likewise, we demonstrate the same sensing system for the quantitative detection of L-cysteine spiked in undiluted milk. It was demonstrated for the first time that LUB coating can mitigate the deleterious effect of fouling in a SERS sensor without compromising the detection of a target analyte, even in a highly fouling, complex medium like whole blood or milk. This feat is achieved through a molecular sieving property of LUB that separates small analytes from large fouling species directly at the sensing interface resulting in SERS spectra with low background (i.e., noise) levels and excellent analyte spectral fidelity. These findings indicate the great potential for using LUB coatings together with an analyte-selective layer to form a hierarchical separation system for SERS sensing of relevant analytes directly in complex biological media, aquaculture, food matrix or environmental samples.
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Affiliation(s)
- Mingyu Han
- Institute for Frontier Materials, Deakin University, Waurn Ponds, Victoria 3216, Australia.
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Fitzroy, Victoria 3065, Australia
- Commonwealth Scientific and Industrial Research Organization (CSIRO), Agriculture and Food, 671 Sneydes Road, Werribee, Victoria, 3030, Australia
| | - Saimon M Silva
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Fitzroy, Victoria 3065, Australia
- Iverson Health Innovation Research Institute, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Matthew J Russo
- Institute for Frontier Materials, Deakin University, Waurn Ponds, Victoria 3216, Australia.
| | - Pauline E Desroches
- Institute for Frontier Materials, Deakin University, Waurn Ponds, Victoria 3216, Australia.
| | - Weiwei Lei
- Institute for Frontier Materials, Deakin University, Waurn Ponds, Victoria 3216, Australia.
| | - Anita F Quigley
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Fitzroy, Victoria 3065, Australia
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia
| | - Robert M I Kapsa
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Fitzroy, Victoria 3065, Australia
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia
| | - Simon E Moulton
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Fitzroy, Victoria 3065, Australia
- Iverson Health Innovation Research Institute, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Paul R Stoddart
- School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia.
| | - George W Greene
- Institute for Frontier Materials, Deakin University, Waurn Ponds, Victoria 3216, Australia.
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Fitzroy, Victoria 3065, Australia
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4
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Nascimento ATD, Mendes AX, Begeng JM, Duchi S, Stoddart PR, Quigley AF, Kapsa RMI, Ibbotson MR, Silva SM, Moulton SE. A tissue-engineered neural interface with photothermal functionality. Biomater Sci 2023. [PMID: 37194340 DOI: 10.1039/d3bm00139c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Neural interfaces are well-established as a tool to understand the behaviour of the nervous system via recording and stimulation of living neurons, as well as serving as neural prostheses. Conventional neural interfaces based on metals and carbon-based materials are generally optimised for high conductivity; however, a mechanical mismatch between the interface and the neural environment can significantly reduce long-term neuromodulation efficacy by causing an inflammatory response. This paper presents a soft composite material made of gelatin methacryloyl (GelMA) containing graphene oxide (GO) conjugated with gold nanorods (AuNRs). The soft hydrogel presents stiffness within the neural environment range of modulus below 5 kPa, while the AuNRs, when exposed to light in the near infrared range, provide a photothermal response that can be used to improve the spatial and temporal precision of neuromodulation. These favourable properties can be maintained at safer optical power levels when combined with electrical stimulation. In this paper we provide mechanical and biological characterization of the optical activity of the GO-AuNR composite hydrogel. The optical functionality of the material has been evaluated via photothermal stimulation of explanted rat retinal tissue. The outcomes achieved with this study encourage further investigation into optical and electrical costimulation parameters for a range of biomedical applications.
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Affiliation(s)
- Adriana Teixeira do Nascimento
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Alexandre Xavier Mendes
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - James M Begeng
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- National Vision Research Institute, The Australian College of Optometry, Carlton, VIC 3058, Australia
| | - Serena Duchi
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- Department of Surgery, University of Melbourne, St Vincent's Hospital, Melbourne, Victoria 3065, Australia
| | - Paul R Stoddart
- School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Anita F Quigley
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia
- Department of Medicine, University of Melbourne, St Vincent's Hospital Melbourne, Victoria 3065, Australia
| | - Robert M I Kapsa
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia
- Department of Medicine, University of Melbourne, St Vincent's Hospital Melbourne, Victoria 3065, Australia
| | - Michael R Ibbotson
- National Vision Research Institute, The Australian College of Optometry, Carlton, VIC 3058, Australia
- Department of Optometry and Vision Sciences, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Saimon M Silva
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- Iverson Health Innovation Research Institute, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.
| | - Simon E Moulton
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- Iverson Health Innovation Research Institute, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.
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5
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Mendes AX, do Nascimento AT, Duchi S, Quigley AF, Caballero Aguilar LM, Dekiwadia C, Kapsa RMI, Silva SM, Moulton SE. The impact of electrical stimulation protocols on neuronal cell survival and proliferation using cell-laden GelMA/graphene oxide hydrogels. J Mater Chem B 2023; 11:581-593. [PMID: 36533419 DOI: 10.1039/d2tb02387c] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The development of electroactive cell-laden hydrogels (bioscaffolds) has gained interest in neural tissue engineering research due to their inherent electrical properties that can induce the regulation of cell behaviour. Hydrogels combined with electrically conducting materials can respond to external applied electric fields, where these stimuli can promote electro-responsive cell growth and proliferation. A successful neural interface for electrical stimulation should present the desired stable electrical properties, such as high conductivity, low impedance, increased charge storage capacity and similar mechanical properties related to a target neural tissue. We report how different electrical stimulation protocols can impact neuronal cells' survival and proliferation when using cell-laden GelMA/GO hydrogels. The rat pheochromocytoma cell line, PC12s encapsulated into hydrogels showed an increased proliferation behaviour with increasing current amplitudes applied. Furthermore, the presence of GO in GelMA hydrogels enhanced the metabolic activity and DNA content of PC12s compared with GelMA alone. Similarly, hydrogels provided survival of encapsulated cells at higher current amplitudes when compared to cells seeded onto ITO flat surfaces, which expressed significant cell death at a current amplitude of 2.50 mA. Our findings provide new rational choices for electroactive hydrogels and electrical stimulation with broad potential applications in neural tissue engineering research.
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Affiliation(s)
- Alexandre Xavier Mendes
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia. .,Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Adriana Teixeira do Nascimento
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia. .,Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Serena Duchi
- Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia.,Department of Surgery, University of Melbourne, St Vincent's Hospital Melbourne, Victoria 3065, Australia
| | - Anita F Quigley
- Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia.,School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia.,Department of Medicine, University of Melbourne, St Vincent's Hospital Melbourne, Victoria 3065, Australia
| | - Lilith M Caballero Aguilar
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia. .,Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Chaitali Dekiwadia
- RMIT Microscopy and MicroAnalysis Facility (RMMF), STEM College, RMIT University, Melbourne, VIC, 3000, Australia
| | - Robert M I Kapsa
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia. .,Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia.,School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia.,Department of Medicine, University of Melbourne, St Vincent's Hospital Melbourne, Victoria 3065, Australia
| | - Saimon Moraes Silva
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia. .,Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia.,Iverson Health Innovation Research Institute, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
| | - Simon E Moulton
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia. .,Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia.,Iverson Health Innovation Research Institute, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
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6
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Manasa CS, Silva SM, Caballero-Aguilar LM, Quigley AF, Kapsa RMI, Greene GW, Moulton SE. Active and passive drug release by self-assembled lubricin (PRG4) anti-fouling coatings. J Control Release 2022; 352:35-46. [PMID: 36228955 DOI: 10.1016/j.jconrel.2022.10.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Revised: 09/26/2022] [Accepted: 10/04/2022] [Indexed: 11/08/2022]
Abstract
Electroactive polymers (EAPs) have been investigated as materials for use in a range of biomedical applications, ranging from cell culture, electrical stimulation of cultured cells as well as controlled delivery of growth factors and drugs. Despite their excellent drug delivery ability, EAPs are susceptible to biofouling thus they often require surface functionalisation with antifouling coatings to limit unwanted non-specific protein adsorption. Here we demonstrate the surface modification of para toluene sulfonate (pTS) doped polypyrrole with the glycoprotein lubricin (LUB) to produce a self-assembled coating that both prevents surface biofouling while also serving as a high-capacity reservoir for cationic drugs which can then be released passively via diffusion or actively via an applied electrical potential. We carried out our investigation in two parts where we initially assessed the antifouling and cationic drug delivery ability of LUB tethered on a gold surface using quartz crystal microbalance with dissipation monitoring (QCM) to monitor molecular interactions occurring on a gold sensor surface. After confirming the ability of tethered LUB nano brush layers on a gold surface, we introduced an electrochemically grown EAP layer to act as the immobilisation surface for LUB before subsequently introducing the cationic drug doxorubicin hydrochloride (DOX). The release of cationic drug was then investigated under passive and electrochemically stimulated conditions. High-performance liquid chromatography (HPLC) was then carried out to quantify the amount of DOX released. It was shown that the amount of DOX released from nano brush layers of LUB tethered on gold and EAP surfaces could be increased by up to 30% per minute by applying a positive electrochemically stimulating pulse at 0.8 V for one minute. Using bovine serum albumin (BSA), we show that DOX loaded LUB tethered on para toluene sulfonic acid (pTS) doped polypyrrole retained antifouling ability of up to 75% when compared to unloaded tethered LUB. This work demonstrates the unique, novel ability of tethered LUB to actively participate in the delivery of cationic therapeutics on different substrate surfaces. This study could lead to the development of versatile multifunctional biomaterials for use in wide range of biomedical applications, such as dual drug delivery and lubricating coatings, dual drug delivery and antifouling coatings, cellular recording and stimulation.
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Affiliation(s)
- Clayton S Manasa
- School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia; The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Saimon M Silva
- School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia; ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia; The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia; Iverson Health Innovation Research Institute, Swinburne University of Technology, Victoria 3122, Australia
| | - Lilith M Caballero-Aguilar
- School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia; The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Anita F Quigley
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia; The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia; Department of Medicine, St Vincent's Hospital Melbourne, Fitzroy 3065, Melbourne, Australia
| | - Robert M I Kapsa
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia; The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia; Department of Medicine, St Vincent's Hospital Melbourne, Fitzroy 3065, Melbourne, Australia
| | - George W Greene
- Institute for Frontier Materials, Deakin University, Waurn Ponds, Victoria 3216, Australia; ARC Centre of Excellence for Electromaterials Science, Deakin University, Waurn Ponds, Victoria 3216, Australia.
| | - Simon E Moulton
- School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia; ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia; The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia; Iverson Health Innovation Research Institute, Swinburne University of Technology, Victoria 3122, Australia.
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7
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M Silva S, Langley DP, Cossins LR, Samudra AN, Quigley AF, Kapsa RMI, Tothill RW, Greene GW, Moulton SE. Rapid Point-of-Care Electrochemical Sensor for the Detection of Cancer Tn Antigen Carbohydrate in Whole Unprocessed Blood. ACS Sens 2022; 7:3379-3388. [PMID: 36374944 DOI: 10.1021/acssensors.2c01460] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Improving outcomes for cancer patients during treatment and monitoring for cancer recurrence requires personalized care which can only be achieved through regular surveillance for biomarkers. Unfortunately, routine detection for blood-based biomarkers is cost-prohibitive using currently specialized laboratories. Using a rapid self-assembly sensing interface amenable to methods of mass production, we demonstrate the ability to detect and quantify a small carbohydrate-based cancer biomarker, Tn antigen (αGalNAc-Ser/Thr) in a small volume of blood, using a test format strip reminiscent of a blood glucose test. The detection of Tn antigen at picomolar levels is achieved through a new transduction mechanism based on the impact of Tn antigen interactions on the molecular dynamic motion of a lectin cross-linked lubricin antifouling brush. In tests performed on retrospective blood plasma samples from patients presenting three different tumor types, differentiation between healthy and diseased patients was achieved, highlighting the clinical potential for cancer monitoring.
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Affiliation(s)
- Saimon M Silva
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn3122, Victoria, Australia.,The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne3065, Victoria, Australia.,Iverson Health Innovation Research Institute, Swinburne University of Technology, Hawthorn3122, Victoria, Australia
| | | | | | | | - Anita F Quigley
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne3001, Victoria, Australia.,Department of Medicine, University of Melbourne, St. Vincent's Hospital, Melbourne3065, Victoria, Australia.,The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne3065, Victoria, Australia
| | - Robert M I Kapsa
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne3001, Victoria, Australia.,Department of Medicine, University of Melbourne, St. Vincent's Hospital, Melbourne3065, Victoria, Australia.,The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne3065, Victoria, Australia
| | - Richard W Tothill
- Peter MacCallum Cancer Centre, Department of Clinical Pathology, University of Melbourne, Melbourne3010, Victoria, Australia
| | - George W Greene
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Waurn Ponds3216, Victoria, Australia
| | - Simon E Moulton
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Hawthorn3122, Victoria, Australia.,The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne3065, Victoria, Australia.,Iverson Health Innovation Research Institute, Swinburne University of Technology, Hawthorn3122, Victoria, Australia
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8
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Russo MJ, Han M, Menon NG, Quigley AF, Kapsa RMI, Moulton SE, Guijt RM, M Silva S, Schmidt TA, Greene GW. Novel Boundary Lubrication Mechanisms from Molecular Pillows of Lubricin Brush-Coated Graphene Oxide Nanosheets. Langmuir 2022; 38:5351-5360. [PMID: 35465662 DOI: 10.1021/acs.langmuir.1c02970] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
There are numerous biomedical applications where the interfacial shearing of surfaces can cause wear and friction, which can lead to a variety of medical complications such as inflammation, irritation, and even bacterial infection. We introduce a novel nanomaterial additive comprised of two-dimensional graphene oxide nanosheets (2D-NSCs) coated with lubricin (LUB) to reduce the amount of tribological stress in biomedical settings, particularly at low shear rates where boundary lubrication dominates. LUB is a glycoprotein found in the articular joints of mammals and has recently been discovered as an ocular surface boundary lubricant. The ability of LUB to self-assemble into a "telechelic" brush layer on a variety of surfaces was exploited here to coat the top and bottom surfaces of the ultrathin 2D-NSCs in solution, effectively creating a biopolymer-coated nanosheet. A reduction in friction of almost an order of magnitude was measured at a bioinspired interface. This reduction was maintained after repeated washing (5×), suggesting that the large aspect ratio of the 2D-NSCs facilitates effective lubrication even at diluted concentrations. Importantly, and unlike LUB-only treatment, the lubrication effect can be eliminated over 15 rinsing cycles, suggesting that the LUB-coated 2D-NSCs do not exhibit any binding interactions with the shearing surfaces. The effective lubricating properties of the 2D-NSCs combined with full reversibility through rinsing make the LUB-coated 2D-NSCs an intriguing candidate as a lubricant for biomedical applications.
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Affiliation(s)
- Matthew J Russo
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Mingyu Han
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia
| | - Nikhil G Menon
- Biomedical Engineering Department, School of Dental Medicine, UConn Health, Farmington, Connecticut 06030 United States
| | - Anita F Quigley
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3000, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Robert M I Kapsa
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Wollongong, New South Wales 2522, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Simon E Moulton
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- Iverson Health Innovation Research Institute, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Rosanne M Guijt
- Centre for Regional and Rural Futures, Deakin University, Geelong, Victoria 3220, Australia
| | - Saimon M Silva
- ARC Centre of Excellence for Electromaterials Science, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
- Iverson Health Innovation Research Institute, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Tannin A Schmidt
- Biomedical Engineering Department, School of Dental Medicine, UConn Health, Farmington, Connecticut 06030 United States
| | - George W Greene
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia
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9
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Khwannimit D, M Silva S, Desroches PE, Quigley AF, Kapsa RMI, Greene GW, Moulton SE. Potential Pulse-Facilitated Active Adsorption of Lubricin Polymer Brushes Can Both Accelerate Self-Assembly and Control Grafting Density. Langmuir 2021; 37:11188-11193. [PMID: 34506141 DOI: 10.1021/acs.langmuir.1c02263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Self-assembled lubricin (LUB) monolayers are an effective antiadhesive coating for biomedical applications. Long deposition times and limited control over the monolayer grafting density remain impediments to commercialization and applications in advanced sensor technologies. This work describes a novel potential pulse-facilitated coating method that reduces coating times to mere seconds while also providing high-level control over the achieved grafting density. This is the first time that the potential pulse-facilitated method is applied for direct assembling of a large and complex polyelectrolyte.
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Affiliation(s)
- Duangruedee Khwannimit
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, John Street, Hawthorn, Melbourne/Victoria 3122, Australia
| | - Saimon M Silva
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, John Street, Hawthorn, Melbourne/Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, 41 Victoria Parade, Fitzroy, Melbourne/Victoria 3065, Australia
- Iverson Health Innovation Research Institute, Swinburne University of Technology, John Street, Hawthorn, Melbourne, Victoria 3122, Australia
| | - Pauline E Desroches
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, 221 Burwood Highway, Burwood, Melbourne/Victoria 3216, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, 41 Victoria Parade, Fitzroy, Melbourne/Victoria 3065, Australia
| | - Anita F Quigley
- School of Electrical and Biomedical Engineering, RMIT University, 124 La Trobe Street, Melbourne/Victoria 3001, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, 41 Victoria Parade, Fitzroy, Melbourne/Victoria 3065, Australia
- Department of Medicine, University of Melbourne, St. Vincent's Hospital, 41 Victoria Parade, Fitzroy, Melbourne/Victoria 3065, Australia
| | - Robert M I Kapsa
- School of Electrical and Biomedical Engineering, RMIT University, 124 La Trobe Street, Melbourne/Victoria 3001, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, 41 Victoria Parade, Fitzroy, Melbourne/Victoria 3065, Australia
- Department of Medicine, University of Melbourne, St. Vincent's Hospital, 41 Victoria Parade, Fitzroy, Melbourne/Victoria 3065, Australia
| | - George W Greene
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, 221 Burwood Highway, Burwood, Melbourne/Victoria 3216, Australia
| | - Simon E Moulton
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, John Street, Hawthorn, Melbourne/Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, 41 Victoria Parade, Fitzroy, Melbourne/Victoria 3065, Australia
- Iverson Health Innovation Research Institute, Swinburne University of Technology, John Street, Hawthorn, Melbourne, Victoria 3122, Australia
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10
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Szin N, Silva SM, Moulton SE, Kapsa RMI, Quigley AF, Greene GW. Cellular Interactions with Lubricin and Hyaluronic Acid-Lubricin Composite Coatings on Gold Electrodes in Passive and Electrically Stimulated Environments. ACS Biomater Sci Eng 2021; 7:3696-3708. [PMID: 34283570 DOI: 10.1021/acsbiomaterials.1c00479] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In the field of bionics, the long-term effectiveness of implantable bionic interfaces depends upon maintaining a "clean" and unfouled electrical interface with biological tissues. Lubricin (LUB) is an innately biocompatible glycoprotein with impressive antifouling properties. Unlike traditional antiadhesive coatings, LUB coatings do not passivate electrode surfaces, giving LUB coatings great potential for controlling surface fouling of implantable electrode interfaces. This study characterizes the antifouling properties of bovine native LUB (N-LUB), recombinant human LUB (R-LUB), hyaluronic acid (HA), and composite coatings of HA and R-LUB (HA/R-LUB) on gold electrodes against human primary fibroblasts and chondrocytes in passive and electrically stimulated environments for up to 96 h. R-LUB coatings demonstrated highly effective antifouling properties, preventing nearly all adhesion and proliferation of fibroblasts and chondrocytes even under biphasic electrical stimulation. N-LUB coatings, while showing efficacy in the short term, failed to produce sustained antifouling properties against fibroblasts or chondrocytes over longer periods of time. HA/R-LUB composite films also demonstrated highly effective antifouling performance equal to the R-LUB coatings in both passive and electrically stimulated environments. The high electrochemical stability and long-lasting antifouling properties of R-LUB and HA/R-LUB coatings in electrically stimulating environments reveal the potential of these coatings for controlling unwanted cell adhesion in implantable bionic applications.
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Affiliation(s)
- Natalie Szin
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, VIC 3216, Australia
| | - Saimon M Silva
- Aikenhead Centre for Medical Discovery, St. Vincent's Hospital Melbourne, Melbourne, VIC 3065, Australia.,ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, VIC 3122, Australia
| | - Simon E Moulton
- Aikenhead Centre for Medical Discovery, St. Vincent's Hospital Melbourne, Melbourne, VIC 3065, Australia.,ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, VIC 3122, Australia
| | - Robert M I Kapsa
- Aikenhead Centre for Medical Discovery, St. Vincent's Hospital Melbourne, Melbourne, VIC 3065, Australia.,School of Electrical and Biomedical Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - Anita F Quigley
- Aikenhead Centre for Medical Discovery, St. Vincent's Hospital Melbourne, Melbourne, VIC 3065, Australia.,School of Electrical and Biomedical Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - George W Greene
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, VIC 3216, Australia
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11
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Firipis K, Boyd-Moss M, Long B, Dekiwadia C, Hoskin W, Pirogova E, Nisbet DR, Kapsa RMI, Quigley AF, Williams RJ. Tuneable Hybrid Hydrogels via Complementary Self-Assembly of a Bioactive Peptide with a Robust Polysaccharide. ACS Biomater Sci Eng 2021; 7:3340-3350. [PMID: 34125518 DOI: 10.1021/acsbiomaterials.1c00675] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Synthetic materials designed for improved biomimicry of the extracellular matrix must contain fibrous, bioactive, and mechanical cues. Self-assembly of low molecular weight gelator (LMWG) peptides Fmoc-DIKVAV (Fmoc-aspartic acid-isoleucine-lysine-valine-alanine-valine) and Fmoc-FRGDF (Fmoc-phenylalanine-arginine-glycine-aspartic acid-phenylalanine) creates fibrous and bioactive hydrogels. Polysaccharides such as agarose are biocompatible, degradable, and non-toxic. Agarose and these Fmoc-peptides have both demonstrated efficacy in vitro and in vivo. These materials have complementary properties; agarose has known mechanics in the physiological range but is inert and would benefit from bioactive and topographical cues found in the fibrous, protein-rich extracellular matrix. Fmoc-DIKVAV and Fmoc-FRGDF are synthetic self-assembling peptides that present bioactive cues "IKVAV" and "RGD" designed from the ECM proteins laminin and fibronectin. The work presented here demonstrates that the addition of agarose to Fmoc-DIKVAV and Fmoc-FRGDF results in physical characteristics that are dependent on agarose concentration. The networks are peptide-dominated at low agarose concentrations, and agarose-dominated at high agarose concentrations, resulting in distinct changes in structural morphology. Interestingly, at mid-range agarose concentration, a hybrid network is formed with structural similarities to both peptide and agarose systems, demonstrating reinforced mechanical properties. Bioactive-LMWG polysaccharide hydrogels demonstrate controllable microenvironmental properties, providing the ability for tissue-specific biomaterial design for tissue engineering and 3D cell culture.
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Affiliation(s)
- Kate Firipis
- Biofab3D, Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Fitzroy, VIC 3065, Australia.,Biomedical and Electrical Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - Mitchell Boyd-Moss
- Biofab3D, Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Fitzroy, VIC 3065, Australia.,Biomedical and Electrical Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia.,Institute of Mental and Physical Health and Clinical Translation, School of Medicine, Deakin University, Waurn Ponds, VIC 3216, Australia
| | - Benjamin Long
- Faculty of Science and Technology, Federation University, Mt. Helen, VIC 3350, Australia
| | - Chaitali Dekiwadia
- RMIT Microscopy and MicroAnalysis Facility (RMMF), RMIT University, Melbourne, Vic 3000, Australia
| | - William Hoskin
- Faculty of Science and Technology, Federation University, Mt. Helen, VIC 3350, Australia
| | - Elena Pirogova
- Biomedical and Electrical Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - David R Nisbet
- Laboratory of Advanced Biomaterials, The Australian National University, Acton, Canberra 2601, Australia
| | - Robert M I Kapsa
- Biofab3D, Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Fitzroy, VIC 3065, Australia.,Biomedical and Electrical Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia.,ARC Centre of Excellence in Electromaterials Science, Department of Medicine, Melbourne University, St Vincent's Hospital Melbourne, Fitzroy, Victoria 3065, Australia.,Department of Medicine, St Vincent's Hospital Melbourne, University of Melbourne, Fitzroy, Vic 3065, Australia
| | - Anita F Quigley
- Biofab3D, Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Fitzroy, VIC 3065, Australia.,Biomedical and Electrical Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia.,ARC Centre of Excellence in Electromaterials Science, Department of Medicine, Melbourne University, St Vincent's Hospital Melbourne, Fitzroy, Victoria 3065, Australia.,Department of Medicine, St Vincent's Hospital Melbourne, University of Melbourne, Fitzroy, Vic 3065, Australia
| | - Richard J Williams
- Biofab3D, Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Fitzroy, VIC 3065, Australia.,Institute of Mental and Physical Health and Clinical Translation, School of Medicine, Deakin University, Waurn Ponds, VIC 3216, Australia
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12
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Xavier Mendes A, Moraes Silva S, O'Connell CD, Duchi S, Quigley AF, Kapsa RMI, Moulton SE. Enhanced Electroactivity, Mechanical Properties, and Printability through the Addition of Graphene Oxide to Photo-Cross-linkable Gelatin Methacryloyl Hydrogel. ACS Biomater Sci Eng 2021; 7:2279-2295. [PMID: 33956434 DOI: 10.1021/acsbiomaterials.0c01734] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The human tissues most sensitive to electrical activity such as neural and muscle tissues are relatively soft, and yet traditional conductive materials used to interface with them are typically stiffer by many orders of magnitude. Overcoming this mismatch, by creating both very soft and electroactive materials, is a major challenge in bioelectronics and biomaterials science. One strategy is to imbue soft materials, such as hydrogels, with electroactive properties by adding small amounts of highly conductive nanomaterials. However, electroactive hydrogels reported to date have required relatively large volume fractions (>1%) of added nanomaterial, have shown only modest electroactivity, and have not been processable via additive manufacturing to create 3D architectures. Here, we describe the development and characterization of improved biocompatible photo-cross-linkable soft hybrid electroactive hydrogels based on gelatin methacryloyol (GelMA) and large area graphene oxide (GO) flakes, which resolve each of these three limitations. The addition of very small amounts (less than a 0.07% volume fraction) of GO to a 5% w/v GelMA hydrogel resulted in a dramatic (∼35-fold) decrease in the impedance at 1 Hz compared with GelMA alone. The GelMA/GO coated indium tin oxide (ITO) electrode also showed a considerable reduction in the impedance at 1 kHz (down to 170 Ω compared with 340 Ω for the GelMA-coated ITO), while charge injection capacity increased more than 6-fold. We attribute this enhanced electroactivity to the increased electroactive surface area contributed by the GO. Despite this dramatic change in electroactivity, the GelMA/GO composite hydrogels' mechanical properties were only moderately affected. Mechanical properties increased by ∼2-fold, and therefore, the hydrogels' desired softness of <4 kPa was retained. Also, we demonstrate how light attenuation through the gel can be used to create a stiffness gradient with the exposed surface of the gel having an elastic modulus of <1.5 kPa. GO addition also enhanced the rheological properties of the GelMA composites, thus facilitating 3D extrusion printing. GelMA/GO enhanced filament formation as well as improved printability and the shape fidelity/integrity of 3D printed structures compared with GelMA alone. Additionally, the GelMA/GO 3D printed structures presented a higher electroactive behavior than nonprinted samples containing the same GelMA/GO amount, which can be attributed to the higher electroactive surface area of 3D printed structures. These findings provide new rational choices of electroactive hydrogel (EAH) compositions with broad potential applications in bioelectronics, tissue engineering, and drug delivery.
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Affiliation(s)
- Alexandre Xavier Mendes
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.,The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Saimon Moraes Silva
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.,The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Cathal D O'Connell
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia.,The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Serena Duchi
- The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia.,Department of Medicine, University of Melbourne, St Vincent's Hospital, Melbourne, Victoria 3065, Australia
| | - Anita F Quigley
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia.,The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia.,Department of Medicine, University of Melbourne, St Vincent's Hospital, Melbourne, Victoria 3065, Australia
| | - Robert M I Kapsa
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.,School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia.,The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia.,Department of Medicine, University of Melbourne, St Vincent's Hospital, Melbourne, Victoria 3065, Australia
| | - Simon E Moulton
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.,The Aikenhead Centre for Medical Discovery, St Vincent's Hospital Melbourne, Melbourne, Victoria 3065, Australia.,Iverson Health Innovation Research Institute, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
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13
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Russo MJ, Han M, Desroches PE, Manasa CS, Dennaoui J, Quigley AF, Kapsa RMI, Moulton SE, Guijt RM, Greene GW, Silva SM. Antifouling Strategies for Electrochemical Biosensing: Mechanisms and Performance toward Point of Care Based Diagnostic Applications. ACS Sens 2021; 6:1482-1507. [PMID: 33765383 DOI: 10.1021/acssensors.1c00390] [Citation(s) in RCA: 74] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Although there exist numerous established laboratory-based technologies for sample diagnostics and analyte detection, many medical and forensic science applications require point of care based platforms for rapid on-the-spot sample analysis. Electrochemical biosensors provide a promising avenue for such applications due to the portability and functional simplicity of the technology. However, the ability to develop such platforms with the high sensitivity and selectivity required for analysis of low analyte concentrations in complex biological samples remains a paramount issue in the field of biosensing. Nonspecific adsorption, or fouling, at the electrode interface via the innumerable biomolecules present in these sample types (i.e., serum, urine, blood/plasma, and saliva) can drastically obstruct electrochemical performance, increasing background "noise" and diminishing both the electrochemical signal magnitude and specificity of the biosensor. Consequently, this review aims to discuss strategies and concepts used throughout the literature to prevent electrode surface fouling in biosensors and to communicate the nature of the antifouling mechanisms by which they operate. Evaluation of each antifouling strategy is focused primarily on the fabrication method, experimental technique, sample composition, and electrochemical performance of each technology highlighting the overall feasibility of the platform for point of care based diagnostic/detection applications.
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Affiliation(s)
- Matthew J. Russo
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent’s Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Mingyu Han
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia
| | - Pauline E. Desroches
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent’s Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Clayton S. Manasa
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent’s Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Jessair Dennaoui
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3000, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent’s Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Anita F. Quigley
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3000, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent’s Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Robert M. I. Kapsa
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3000, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent’s Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Simon E. Moulton
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- Iverson Health Innovation Research Institute, Swinburne University of Technology, Victoria 3122, Australia
- Centre for Regional and Rural Futures, Deakin University, Geelong, Victoria 3220, Australia
| | - Rosanne M. Guijt
- Centre for Regional and Rural Futures, Deakin University, Geelong, Victoria 3220, Australia
| | - George W. Greene
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia
| | - Saimon Moraes Silva
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- The Aikenhead Centre for Medical Discovery, St Vincent’s Hospital Melbourne, Melbourne, Victoria 3065, Australia
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14
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Desroches PE, Silva SM, Gietman SW, Quigley AF, Kapsa RMI, Moulton SE, Greene GW. Lubricin (PRG4) Antiadhesive Coatings Mitigate Electrochemical Impedance Instabilities in Polypyrrole Bionic Electrodes Exposed to Fouling Fluids. ACS Appl Bio Mater 2020; 3:8032-8039. [DOI: 10.1021/acsabm.0c01109] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Pauline E. Desroches
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia
- BioFab3D@ACMD, St Vincent’s Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Saimon M. Silva
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- BioFab3D@ACMD, St Vincent’s Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Shaun W. Gietman
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- BioFab3D@ACMD, St Vincent’s Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Anita F. Quigley
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia
- BioFab3D@ACMD, St Vincent’s Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Robert M. I. Kapsa
- School of Electrical and Biomedical Engineering, RMIT University, Melbourne, Victoria 3001, Australia
- BioFab3D@ACMD, St Vincent’s Hospital Melbourne, Melbourne, Victoria 3065, Australia
| | - Simon E. Moulton
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
- Iverson Health Innovation Research Institute, Swinburne University of Technology, Victoria 3122, Australia
| | - George W. Greene
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science, Deakin University, Melbourne, Victoria 3216, Australia
- ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Deakin University, Burwood, Victoria 3125, Australia
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15
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Russo MJ, Quigley AF, Kapsa RMI, Moulton SE, Guijt R, Silva SM, Greene GW. A Simple Electrochemical Swab Assay for the Rapid Quantification of Clonazepam in Unprocessed Saliva Enabled by Lubricin Antifouling Coatings. ChemElectroChem 2020. [DOI: 10.1002/celc.202000393] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Matthew J. Russo
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science Deakin University Melbourne Victoria 3216 Australia
- BioFab3D@ACMD St Vincent's Hospital Melbourne Melbourne Victoria 3065 Australia
| | - Anita F. Quigley
- School of Electrical and Biomedical Engineering RMIT University Melbourne Victoria 3000 Australia
- BioFab3D@ACMD St Vincent's Hospital Melbourne Melbourne Victoria 3065 Australia
| | - Robert M. I. Kapsa
- School of Electrical and Biomedical Engineering RMIT University Melbourne Victoria 3000 Australia
- BioFab3D@ACMD St Vincent's Hospital Melbourne Melbourne Victoria 3065 Australia
| | - Simon E. Moulton
- ARC Centre of Excellence for Electromaterials Science Faculty of Science Engineering and Technology Swinburne University of Technology Melbourne Victoria 3122 Australia
- Iverson Health Innovation Research Institute Swinburne University of Technology Victoria 3122 Australia
| | - Rosanne Guijt
- Centre for Regional and Rural Futures Deakin University Geelong VIC 3220 Australia
| | - Saimon M. Silva
- ARC Centre of Excellence for Electromaterials Science Faculty of Science Engineering and Technology Swinburne University of Technology Melbourne Victoria 3122 Australia
- BioFab3D@ACMD St Vincent's Hospital Melbourne Melbourne Victoria 3065 Australia
| | - George W. Greene
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science Deakin University Melbourne Victoria 3216 Australia
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16
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Quigley AF, Cornock R, Mysore T, Foroughi J, Kita M, Razal JM, Crook J, Moulton SE, Wallace GG, Kapsa RMI. Wet-Spun Trojan Horse Cell Constructs for Engineering Muscle. Front Chem 2020; 8:18. [PMID: 32154210 PMCID: PMC7044405 DOI: 10.3389/fchem.2020.00018] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Accepted: 01/08/2020] [Indexed: 11/15/2022] Open
Abstract
Engineering of 3D regenerative skeletal muscle tissue constructs (skMTCs) using hydrogels containing muscle precursor cells (MPCs) is of potential benefit for repairing Volumetric Muscle Loss (VML) arising from trauma (e.g., road/industrial accident, war injury) or for restoration of functional muscle mass in disease (e.g., Muscular Dystrophy, muscle atrophy). Additive Biofabrication (AdBiofab) technologies make possible fabrication of 3D regenerative skMTCs that can be tailored to specific delivery requirements of VML or functional muscle restoration. Whilst 3D printing is useful for printing constructs of many tissue types, the necessity of a balanced compromise between cell type, required construct size and material/fabrication process cyto-compatibility can make the choice of 3D printing a secondary alternative to other biofabrication methods such as wet-spinning. Alternatively, wet-spinning is more amenable to formation of fibers rather than (small) layered 3D-Printed constructs. This study describes the fabrication of biosynthetic alginate fibers containing MPCs and their use for delivery of dystrophin-expressing cells to dystrophic muscle in the mdx mouse model of Duchenne Muscular Dystrophy (DMD) compared to poly(DL-lactic-co-glycolic acid) copolymer (PLA:PLGA) topically-seeded with myoblasts. In addition, this study introduces a novel method by which to create 3D layered wet-spun alginate skMTCs for bulk mass delivery of MPCs to VML lesions. As such, this work introduces the concept of "Trojan Horse" Fiber MTCs (TH-fMTCs) and 3d Mesh-MTCs (TH-mMTCs) for delivery of regenerative MPCs to diseased and damaged muscle, respectively.
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Affiliation(s)
- Anita F. Quigley
- ARC Centre for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Fairy Meadow, NSW, Australia
- Centre for Clinical Neurosciences and Neurological Research, St. Vincent's Hospital Melbourne, Fitzroy, VIC, Australia
- School of Engineering, Royal Melbourne Institute of Technology, Melbourne, VIC, Australia
| | - Rhys Cornock
- ARC Centre for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Fairy Meadow, NSW, Australia
| | - Tharun Mysore
- School of Medicine and Faculty of Health, Deakin University, Waurn Ponds, VIC, Australia
| | - Javad Foroughi
- ARC Centre for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Fairy Meadow, NSW, Australia
| | - Magdalena Kita
- ARC Centre for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Fairy Meadow, NSW, Australia
- Centre for Clinical Neurosciences and Neurological Research, St. Vincent's Hospital Melbourne, Fitzroy, VIC, Australia
| | - Joselito M. Razal
- Institute for Frontier Materials, Deakin University, Waurn Ponds, VIC, Australia
| | - Jeremy Crook
- ARC Centre for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Fairy Meadow, NSW, Australia
- Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong, NSW, Australia
- Department of Surgery, St Vincent's Hospital, The University of Melbourne, Fitzroy, VIC, Australia
| | - Simon E. Moulton
- Department of Biomedical Engineering, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC, Australia
| | - Gordon G. Wallace
- ARC Centre for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Fairy Meadow, NSW, Australia
| | - Robert M. I. Kapsa
- ARC Centre for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Fairy Meadow, NSW, Australia
- Centre for Clinical Neurosciences and Neurological Research, St. Vincent's Hospital Melbourne, Fitzroy, VIC, Australia
- School of Engineering, Royal Melbourne Institute of Technology, Melbourne, VIC, Australia
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17
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Russo MJ, Han M, Quigley AF, Kapsa RM, Moulton SE, Doeven E, Guijt R, Silva SM, Greene GW. Lubricin (PRG4) reduces fouling susceptibility and improves sensitivity of carbon-based electrodes. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2019.135574] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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18
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Duc D, Stoddart PR, McArthur SL, Kapsa RMI, Quigley AF, Boyd‐Moss M, Moulton SE. Electrical Cell Stimulation: Fabrication of a Biocompatible Liquid Crystal Graphene Oxide–Gold Nanorods Electro‐ and Photoactive Interface for Cell Stimulation (Adv. Healthcare Mater. 9/2019). Adv Healthc Mater 2019. [DOI: 10.1002/adhm.201970036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Daniela Duc
- ARC Centre of Excellence for Electromaterials ScienceFaculty of Science, Engineering and TechnologySwinburne University of Technology John St Hawthorn VIC 3122 Australia
| | - Paul R. Stoddart
- ARC Centre of Excellence for Electromaterials ScienceFaculty of Science, Engineering and TechnologySwinburne University of Technology John St Hawthorn VIC 3122 Australia
- ARC Training Centre in BiodevicesSwinburne University of Technology John St Hawthorn VIC 3122 Australia
| | - Sally L. McArthur
- ARC Centre of Excellence for Electromaterials ScienceFaculty of Science, Engineering and TechnologySwinburne University of Technology John St Hawthorn VIC 3122 Australia
- ARC Training Centre in BiodevicesSwinburne University of Technology John St Hawthorn VIC 3122 Australia
| | - Robert M. I. Kapsa
- ARC Centre of Excellence for Electromaterials ScienceIntelligent Polymer Research Institute AIIMUniversity of Wollongong Innovation Campus Squires Way North Wollongong NSW 2500 Australia
- Department of MedicineSt Vincent's HospitalThe University of Melbourne 41 Victoria Parade Fitzroy VIC 3065 Australia
- Biofab3D@ACMDSt. Vincent's Hospital 41 Victoria Parade Fitzroy VIC 3065 Australia
| | - Anita F. Quigley
- ARC Centre of Excellence for Electromaterials ScienceIntelligent Polymer Research Institute AIIMUniversity of Wollongong Innovation Campus Squires Way North Wollongong NSW 2500 Australia
- Department of MedicineSt Vincent's HospitalThe University of Melbourne 41 Victoria Parade Fitzroy VIC 3065 Australia
- Biofab3D@ACMDSt. Vincent's Hospital 41 Victoria Parade Fitzroy VIC 3065 Australia
| | - Mitchell Boyd‐Moss
- Biofab3D@ACMDSt. Vincent's Hospital 41 Victoria Parade Fitzroy VIC 3065 Australia
- School of EngineeringRMIT University 124 La Trobe St Melbourne VIC 3000 Australia
| | - Simon E. Moulton
- ARC Centre of Excellence for Electromaterials ScienceFaculty of Science, Engineering and TechnologySwinburne University of Technology John St Hawthorn VIC 3122 Australia
- Iverson Health Innovation Research InstituteSwinburne University of Technology John St Hawthorn VIC 3122 Australia
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19
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Duc D, Stoddart PR, McArthur SL, Kapsa RMI, Quigley AF, Boyd‐Moss M, Moulton SE. Fabrication of a Biocompatible Liquid Crystal Graphene Oxide-Gold Nanorods Electro- and Photoactive Interface for Cell Stimulation. Adv Healthc Mater 2019; 8:e1801321. [PMID: 30838818 DOI: 10.1002/adhm.201801321] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Revised: 01/25/2019] [Indexed: 01/08/2023]
Abstract
For decades, electrode-tissue interfaces are pursued to establish electrical stimulation as a reliable means to control neuronal cells behavior. However, spreading of electrical currents in tissues limits its spatial precision. Thus, optical cues, such as near-infrared (NIR) light, are explored as alternatives. Presently, NIR stimulation requires higher energy input than electrical methods despite introduction of light absorbers, e.g., gold nanoparticles. As potential solution, NIR and electrical costimulation are proposed but with limited interfaces capable of sustaining this stimulation technique. Here, a novel electroactive nanocomposite with photoactive properties in the NIR range is constructed by N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride/N-hydroxysulfosuccinimide sodium (EDC)/NHS conjugation of liquid crystal graphene oxide (LCGO) to protein-coated gold nanorods (AuNR). The liquid crystal graphene oxide-gold nanorod nanocomposite (LCGO-AuNR) is fabricated into a hydrophilic electrode-coating via drop-casting, making it appropriate for versatile electrode-tissue interface fabrication. UV-vis spectrophotometry results demonstrate that LCGO-AuNR presents an absorbance peak at 798 nm (NIR range). Cyclic voltammetry measurements further confirm its electroactive capacitive properties. Furthermore, LCGO-AuNR coating supports cell adhesion, proliferation, and differentiation of NG108-15 neuronal cells. This biocompatible interface is anticipated, with ideal electrical and optical properties for NIR and electrical costimulation, to enable further development of the technique for energy-efficient and precise neuronal cell modulation.
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Affiliation(s)
- Daniela Duc
- ARC Centre of Excellence for Electromaterials ScienceFaculty of Science, Engineering and TechnologySwinburne University of Technology John St Hawthorn VIC 3122 Australia
| | - Paul R. Stoddart
- ARC Centre of Excellence for Electromaterials ScienceFaculty of Science, Engineering and TechnologySwinburne University of Technology John St Hawthorn VIC 3122 Australia
- ARC Training Centre in BiodevicesSwinburne University of Technology John St Hawthorn VIC 3122 Australia
| | - Sally L. McArthur
- ARC Centre of Excellence for Electromaterials ScienceFaculty of Science, Engineering and TechnologySwinburne University of Technology John St Hawthorn VIC 3122 Australia
- ARC Training Centre in BiodevicesSwinburne University of Technology John St Hawthorn VIC 3122 Australia
| | - Robert M. I. Kapsa
- ARC Centre of Excellence for Electromaterials ScienceIntelligent Polymer Research Institute AIIMUniversity of Wollongong Innovation Campus Squires Way North Wollongong NSW 2500 Australia
- Department of MedicineSt Vincent's HospitalThe University of Melbourne 41 Victoria Parade Fitzroy VIC 3065 Australia
- Biofab3D@ACMDSt. Vincent's Hospital 41 Victoria Parade Fitzroy VIC 3065 Australia
| | - Anita F. Quigley
- ARC Centre of Excellence for Electromaterials ScienceIntelligent Polymer Research Institute AIIMUniversity of Wollongong Innovation Campus Squires Way North Wollongong NSW 2500 Australia
- Department of MedicineSt Vincent's HospitalThe University of Melbourne 41 Victoria Parade Fitzroy VIC 3065 Australia
- Biofab3D@ACMDSt. Vincent's Hospital 41 Victoria Parade Fitzroy VIC 3065 Australia
| | - Mitchell Boyd‐Moss
- Biofab3D@ACMDSt. Vincent's Hospital 41 Victoria Parade Fitzroy VIC 3065 Australia
- School of EngineeringRMIT University 124 La Trobe St Melbourne VIC 3000 Australia
| | - Simon E. Moulton
- ARC Centre of Excellence for Electromaterials ScienceFaculty of Science, Engineering and TechnologySwinburne University of Technology John St Hawthorn VIC 3122 Australia
- Iverson Health Innovation Research InstituteSwinburne University of Technology John St Hawthorn VIC 3122 Australia
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20
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Silva SM, Quigley AF, Kapsa RMI, Greene GW, Moulton SE. Lubricin on Platinum Electrodes: A Low‐Impedance Protein‐Resistant Surface Towards Biomedical Implantation. ChemElectroChem 2019. [DOI: 10.1002/celc.201900237] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Saimon M. Silva
- Faculty of Science, Engineering & Technology Swinburne University of Technology Melbourne VIC 3122 Australia
| | - Anita F. Quigley
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Wollongong NSW 2522 Australia
| | - Robert M. I. Kapsa
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Wollongong NSW 2522 Australia
| | - George W. Greene
- Institute for Frontier Materials and ARC Centre of Excellence for Electromaterials Science Deakin University Melbourne VIC 3216 Australia
| | - Simon E. Moulton
- Faculty of Science, Engineering & Technology Swinburne University of Technology Melbourne VIC 3122 Australia
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21
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Bourke JL, Quigley AF, Duchi S, O'Connell CD, Crook JM, Wallace GG, Cook MJ, Kapsa RM. Three‐dimensional neural cultures produce networks that mimic native brain activity. J Tissue Eng Regen Med 2017; 12:490-493. [DOI: 10.1002/term.2508] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 06/14/2017] [Accepted: 06/29/2017] [Indexed: 01/15/2023]
Affiliation(s)
- Justin L. Bourke
- Australian Research Council Centre of Excellence for Electromaterials Science Australia
- Department of Medicine, St Vincent's Hospital Melbourne University of Melbourne Fitzroy VIC Australia
| | - Anita F. Quigley
- Australian Research Council Centre of Excellence for Electromaterials Science Australia
- Department of Medicine, St Vincent's Hospital Melbourne University of Melbourne Fitzroy VIC Australia
- Intelligent Polymer Research Institute University of Wollongong NSW Australia
| | - Serena Duchi
- Australian Research Council Centre of Excellence for Electromaterials Science Australia
- Intelligent Polymer Research Institute University of Wollongong NSW Australia
- Department of Surgery University of Melbourne, St Vincent's Hospital Fitzroy VIC Australia
| | - Cathal D. O'Connell
- Australian Research Council Centre of Excellence for Electromaterials Science Australia
- Intelligent Polymer Research Institute University of Wollongong NSW Australia
| | - Jeremy M. Crook
- Australian Research Council Centre of Excellence for Electromaterials Science Australia
- Intelligent Polymer Research Institute University of Wollongong NSW Australia
| | - Gordon G. Wallace
- Australian Research Council Centre of Excellence for Electromaterials Science Australia
- Intelligent Polymer Research Institute University of Wollongong NSW Australia
| | - Mark J. Cook
- Australian Research Council Centre of Excellence for Electromaterials Science Australia
- Department of Medicine, St Vincent's Hospital Melbourne University of Melbourne Fitzroy VIC Australia
| | - Robert M.I. Kapsa
- Australian Research Council Centre of Excellence for Electromaterials Science Australia
- Department of Medicine, St Vincent's Hospital Melbourne University of Melbourne Fitzroy VIC Australia
- Intelligent Polymer Research Institute University of Wollongong NSW Australia
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22
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Zhang BGX, Spinks GM, Gorkin R, Sangian D, Di Bella C, Quigley AF, Kapsa RMI, Wallace GG, Choong PFM. In vivo biocompatibility of porous and non-porous polypyrrole based trilayered actuators. J Mater Sci Mater Med 2017; 28:172. [PMID: 28956202 DOI: 10.1007/s10856-017-5979-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Accepted: 09/01/2017] [Indexed: 05/11/2023]
Abstract
Trilayered polypyrrole (PPy) actuators have high stress density, low modulus and have wide potential biological applications including use in artificial muscles and in limb prosthesis after limb amputation. This article examines the in vivo biocompatibility of actuators in muscle using rabbit models. The actuators were specially designed with pores to encourage tissue in growth; this study also assessed the effect of such pores on the stability of the actuators in vivo. Trilayered PPy actuators were either laser cut with 150 µm pores or left pore-less and implanted into rabbit muscle for 3 days, 2 weeks, 4 weeks and 8 weeks and retrieved subsequently for histological analysis. In a second set of experiments, the cut edges of pores in porous actuator strips were further sealed by PPy after laser cutting to further improve its stability in vivo. Porous actuators with and without PPy sealing of pore edges were implanted intramuscularly for 4 and 8 weeks and assessed with histology. Pore-less actuators incited a mild inflammatory response, becoming progressively walled off by a thin layer of fibrous tissue. Porous actuators showed increased PPy fragmentation and delamination with associated greater foreign body response compared to pore-less actuators. The PPy fragmentation was minimized when the pore edges were sealed off by PPy after laser cutting showing less PPy debris. Laser cutting of the actuators with pores destabilizes the PPy. This can be overcome by sealing the cut edges of the pores with PPy after laser. The findings in this article have implications in future design and manufacturing of PPy actuator for use in vivo.
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Affiliation(s)
- Bill G X Zhang
- Department of Orthopaedics, St. Vincent's Hospital Melbourne and the University of Melbourne, Fitzroy, VIC 3065, Australia
- Department of Surgery, St. Vincent's Hospital Melbourne and the University of Melbourne, Fitzroy, VIC 3065, Australia
| | - Geoffrey M Spinks
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Northfields Ave, Wollongong, NSW 2522, Australia
| | - Robert Gorkin
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Northfields Ave, Wollongong, NSW 2522, Australia
| | - Danial Sangian
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Northfields Ave, Wollongong, NSW 2522, Australia
| | - Claudia Di Bella
- Department of Orthopaedics, St. Vincent's Hospital Melbourne and the University of Melbourne, Fitzroy, VIC 3065, Australia
- Department of Surgery, St. Vincent's Hospital Melbourne and the University of Melbourne, Fitzroy, VIC 3065, Australia
| | - Anita F Quigley
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Northfields Ave, Wollongong, NSW 2522, Australia
- Department of Medicine, St Vincent's Hospital Melbourne and the University of Melbourne, 41 Victoria Pde, Fitzroy, VIC 3065, Australia
| | - Robert M I Kapsa
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Northfields Ave, Wollongong, NSW 2522, Australia
| | - Gordon G Wallace
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Northfields Ave, Wollongong, NSW 2522, Australia
| | - Peter F M Choong
- Department of Orthopaedics, St. Vincent's Hospital Melbourne and the University of Melbourne, Fitzroy, VIC 3065, Australia.
- Department of Surgery, St. Vincent's Hospital Melbourne and the University of Melbourne, Fitzroy, VIC 3065, Australia.
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23
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Duchi S, Onofrillo C, O'Connell CD, Blanchard R, Augustine C, Quigley AF, Kapsa RMI, Pivonka P, Wallace G, Di Bella C, Choong PFM. Handheld Co-Axial Bioprinting: Application to in situ surgical cartilage repair. Sci Rep 2017; 7:5837. [PMID: 28724980 PMCID: PMC5517463 DOI: 10.1038/s41598-017-05699-x] [Citation(s) in RCA: 118] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 06/14/2017] [Indexed: 02/07/2023] Open
Abstract
Three-dimensional (3D) bioprinting is driving major innovations in the area of cartilage tissue engineering. Extrusion-based 3D bioprinting necessitates a phase change from a liquid bioink to a semi-solid crosslinked network achieved by a photo-initiated free radical polymerization reaction that is known to be cytotoxic. Therefore, the choice of the photocuring conditions has to be carefully addressed to generate a structure stiff enough to withstand the forces phisiologically applied on articular cartilage, while ensuring adequate cell survival for functional chondral repair. We recently developed a handheld 3D printer called "Biopen". To progress towards translating this freeform biofabrication tool into clinical practice, we aimed to define the ideal bioprinting conditions that would deliver a scaffold with high cell viability and structural stiffness relevant for chondral repair. To fulfill those criteria, free radical cytotoxicity was confined by a co-axial Core/Shell separation. This system allowed the generation of Core/Shell GelMa/HAMa bioscaffolds with stiffness of 200KPa, achieved after only 10 seconds of exposure to 700 mW/cm2 of 365 nm UV-A, containing >90% viable stem cells that retained proliferative capacity. Overall, the Core/Shell handheld 3D bioprinting strategy enabled rapid generation of high modulus bioscaffolds with high cell viability, with potential for in situ surgical cartilage engineering.
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Affiliation(s)
- Serena Duchi
- University of Melbourne, Department of Surgery, St Vincent's Hospital Melbourne, 29 Regent Street-Clinical Science Building, 3065, Fitzroy, VIC, Australia.,ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, Innovation Campus, University of Wollongong, Northfields Ave, 2522, Wollongong, NSW, Australia
| | - Carmine Onofrillo
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, Innovation Campus, University of Wollongong, Northfields Ave, 2522, Wollongong, NSW, Australia
| | - Cathal D O'Connell
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, Innovation Campus, University of Wollongong, Northfields Ave, 2522, Wollongong, NSW, Australia
| | - Romane Blanchard
- University of Melbourne, Department of Surgery, St Vincent's Hospital Melbourne, 29 Regent Street-Clinical Science Building, 3065, Fitzroy, VIC, Australia
| | - Cheryl Augustine
- University of Melbourne, Department of Surgery, St Vincent's Hospital Melbourne, 29 Regent Street-Clinical Science Building, 3065, Fitzroy, VIC, Australia
| | - Anita F Quigley
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, Innovation Campus, University of Wollongong, Northfields Ave, 2522, Wollongong, NSW, Australia.,Department of Clinical Neurosciences, 5th Floor Daly Wing, St. Vincent's Hospital, 3065, Fitzroy, VIC, Australia.,Department of Medicine, St Vincent's Hospital Melbourne, 3065, Fitzroy, VIC, Australia
| | - Robert M I Kapsa
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, Innovation Campus, University of Wollongong, Northfields Ave, 2522, Wollongong, NSW, Australia.,Department of Clinical Neurosciences, 5th Floor Daly Wing, St. Vincent's Hospital, 3065, Fitzroy, VIC, Australia.,Department of Medicine, St Vincent's Hospital Melbourne, 3065, Fitzroy, VIC, Australia
| | - Peter Pivonka
- University of Melbourne, Department of Surgery, St Vincent's Hospital Melbourne, 29 Regent Street-Clinical Science Building, 3065, Fitzroy, VIC, Australia
| | - Gordon Wallace
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, Innovation Campus, University of Wollongong, Northfields Ave, 2522, Wollongong, NSW, Australia
| | - Claudia Di Bella
- University of Melbourne, Department of Surgery, St Vincent's Hospital Melbourne, 29 Regent Street-Clinical Science Building, 3065, Fitzroy, VIC, Australia. .,ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, Innovation Campus, University of Wollongong, Northfields Ave, 2522, Wollongong, NSW, Australia. .,Department of Orthopaedics, St Vincent's Hospital Melbourne, 3065, Fitzroy, VIC, Australia.
| | - Peter F M Choong
- University of Melbourne, Department of Surgery, St Vincent's Hospital Melbourne, 29 Regent Street-Clinical Science Building, 3065, Fitzroy, VIC, Australia.,ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, Innovation Campus, University of Wollongong, Northfields Ave, 2522, Wollongong, NSW, Australia.,Department of Orthopaedics, St Vincent's Hospital Melbourne, 3065, Fitzroy, VIC, Australia
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24
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Schirmer KSU, Gorkin R, Beirne S, Stewart E, Thompson BC, Quigley AF, Kapsa RMI, Wallace GG. Cell compatible encapsulation of filaments into 3D hydrogels. Biofabrication 2016; 8:025013. [DOI: 10.1088/1758-5090/8/2/025013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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25
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Gopinathan J, Quigley AF, Bhattacharyya A, Padhye R, Kapsa RMI, Nayak R, Shanks RA, Houshyar S. Preparation, characterisation, andin vitroevaluation of electrically conducting poly(ɛ-caprolactone)-based nanocomposite scaffolds using PC12 cells. J Biomed Mater Res A 2015; 104:853-65. [DOI: 10.1002/jbm.a.35620] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 11/13/2015] [Indexed: 12/16/2022]
Affiliation(s)
- Janarthanan Gopinathan
- Advanced Textile and Polymer Research Lab, PSG Institute of Advanced Studies; Coimbatore India
| | - Anita F. Quigley
- Centre for Clinical Neurosciences and Neurological Research, St. Vincent's Hospital; Victoria 3065 Australia
- ARC Centre of Excellence for Electromaterials Science; Intelligent Polymer Research Institute, AIIM Facility, Innovation Campus, University of Wollongong; New South Wales 2500 Australia
- Department of Medicine; University of Melbourne; 3065 Australia
| | - Amitava Bhattacharyya
- Advanced Textile and Polymer Research Lab, PSG Institute of Advanced Studies; Coimbatore India
| | - Rajiv Padhye
- College of Design and Social Context; Centre for Advanced Materials and Performance Textiles, School of Fashion and Textiles, RMIT University; Melbourne 3056 Australia
| | - Robert M. I. Kapsa
- Centre for Clinical Neurosciences and Neurological Research, St. Vincent's Hospital; Victoria 3065 Australia
- ARC Centre of Excellence for Electromaterials Science; Intelligent Polymer Research Institute, AIIM Facility, Innovation Campus, University of Wollongong; New South Wales 2500 Australia
- Department of Medicine; University of Melbourne; 3065 Australia
| | - Rajkishore Nayak
- College of Design and Social Context; Centre for Advanced Materials and Performance Textiles, School of Fashion and Textiles, RMIT University; Melbourne 3056 Australia
| | - Robert A. Shanks
- College of Science, Engineering and Health, School of Applied Sciences, RMIT University; Melbourne 3000 Australia
| | - Shadi Houshyar
- College of Design and Social Context; Centre for Advanced Materials and Performance Textiles, School of Fashion and Textiles, RMIT University; Melbourne 3056 Australia
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26
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Zhang BGX, Quigley AF, Bourke JL, Nowell CJ, Myers DE, Choong PFM, Kapsa RMI. Combination of agrin and laminin increase acetylcholine receptor clustering and enhance functional neuromuscular junction formation In vitro. Dev Neurobiol 2015; 76:551-65. [PMID: 26251299 DOI: 10.1002/dneu.22331] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 06/23/2015] [Accepted: 08/01/2015] [Indexed: 01/07/2023]
Abstract
Clustering of acetylcholine receptors (AChR) at the postsynaptic membrane is a crucial step in the development of neuromuscular junctions (NMJ). During development and after denervation, aneural AChR clusters form on the sarcolemma. Recent studies suggest that these receptors are critical for guiding and initiating synaptogenesis. The aim of this study is to investigate the effect of agrin and laminin-1; agents with known AChR clustering activity; on NMJ formation and muscle maturation. Primary myoblasts were differentiated in vitro on collagen, laminin or collagen and laminin-coated surfaces in the presence or absence of agrin and laminin. The pretreated cells were then subject to innervation by PC12 cells. The number of neuromuscular junctions was assessed by immunocytochemical co-localization of AChR clusters and the presynaptic marker synaptophysin. Functional neuromuscular junctions were quantitated by analysis of the level of spontaneous as well as neuromuscular blocker responsive contractile activity and muscle maturation was assessed by the degree of myotube striation. Agrin alone did not prime muscle for innervation while a combination of agrin and laminin pretreatment increased the number of neuromuscular junctions formed and enhanced acetylcholine based neurotransmission and myotube striation. This study has direct clinical relevance for treatment of denervation injuries and creating functional neuromuscular constructs for muscle tissue repair.
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Affiliation(s)
- Bill G X Zhang
- Department of Orthopaedics, St. Vincent's Hospital Melbourne and the University of Melbourne, Fitzroy, VIC, 3065, Australia.,Department of Surgery, St. Vincent's Hospital Melbourne and the University of Melbourne, Fitzroy, VIC, 3065, Australia
| | - Anita F Quigley
- Department of Medicine, the University of Melbourne, St Vincent's Hospital Melbourne, Fitzroy, VIC, 3065, Australia.,ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Wollongong, NSW, 2522, Australia
| | - Justin L Bourke
- Department of Medicine, the University of Melbourne, St Vincent's Hospital Melbourne, Fitzroy, VIC, 3065, Australia
| | - Cameron J Nowell
- Walter and Eliza Hall Institute, Parkville, VIC, 3052, Australia
| | - Damian E Myers
- Department of Orthopaedics, St. Vincent's Hospital Melbourne and the University of Melbourne, Fitzroy, VIC, 3065, Australia.,Department of Surgery, St. Vincent's Hospital Melbourne and the University of Melbourne, Fitzroy, VIC, 3065, Australia
| | - Peter F M Choong
- Department of Orthopaedics, St. Vincent's Hospital Melbourne and the University of Melbourne, Fitzroy, VIC, 3065, Australia.,Department of Surgery, St. Vincent's Hospital Melbourne and the University of Melbourne, Fitzroy, VIC, 3065, Australia
| | - Robert M I Kapsa
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, University of Wollongong, Wollongong, NSW, 2522, Australia
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Stewart E, Kobayashi NR, Higgins MJ, Quigley AF, Jamali S, Moulton SE, Kapsa RMI, Wallace GG, Crook JM. Electrical stimulation using conductive polymer polypyrrole promotes differentiation of human neural stem cells: a biocompatible platform for translational neural tissue engineering. Tissue Eng Part C Methods 2014; 21:385-93. [PMID: 25296166 DOI: 10.1089/ten.tec.2014.0338] [Citation(s) in RCA: 121] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Conductive polymers (CPs) are organic materials that hold great promise for biomedicine. Potential applications include in vitro or implantable electrodes for excitable cell recording and stimulation and conductive scaffolds for cell support and tissue engineering. In this study, we demonstrate the utility of electroactive CP polypyrrole (PPy) containing the anionic dopant dodecylbenzenesulfonate (DBS) to differentiate novel clinically relevant human neural stem cells (hNSCs). Electrical stimulation of PPy(DBS) induced hNSCs to predominantly β-III Tubulin (Tuj1) expressing neurons, with lower induction of glial fibrillary acidic protein (GFAP) expressing glial cells. In addition, stimulated cultures comprised nodes or clusters of neurons with longer neurites and greater branching than unstimulated cultures. Cell clusters showed a similar spatial distribution to regions of higher conductivity on the film surface. Our findings support the use of electrical stimulation to promote neuronal induction and the biocompatibility of PPy(DBS) with hNSCs and opens up the possibility of identifying novel mechanisms of fate determination of differentiating human stem cells for advanced in vitro modeling, translational drug discovery, and regenerative medicine.
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Affiliation(s)
- Elise Stewart
- 1 ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, AIIM Facility, Innovation Campus, University of Wollongong , Squires Way, Fairy Meadow, Australia
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Payne M, Wang D, Sinclair CM, Kapsa RMI, Quigley AF, Wallace GG, Razal JM, Baughman RH, Münch G, Vallotton P. Automated quantification of neurite outgrowth orientation distributions on patterned surfaces. J Neural Eng 2014; 11:046006. [DOI: 10.1088/1741-2560/11/4/046006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Quigley AF, Bulluss KJ, Kyratzis ILB, Gilmore K, Mysore T, Schirmer KSU, Kennedy EL, O'Shea M, Truong YB, Edwards SL, Peeters G, Herwig P, Razal JM, Campbell TE, Lowes KN, Higgins MJ, Moulton SE, Murphy MA, Cook MJ, Clark GM, Wallace GG, Kapsa RMI. Engineering a multimodal nerve conduit for repair of injured peripheral nerve. J Neural Eng 2013; 10:016008. [DOI: 10.1088/1741-2560/10/1/016008] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Quigley AF, Wagner K, Kita M, Gilmore KJ, Higgins MJ, Breukers RD, Moulton SE, Clark GM, Penington AJ, Wallace GG, Officer DL, Kapsa RMI. In vitro growth and differentiation of primary myoblasts on thiophene based conducting polymers. Biomater Sci 2013; 1:983-995. [DOI: 10.1039/c3bm60059a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Quigley AF, Razal JM, Kita M, Jalili R, Gelmi A, Penington A, Ovalle-Robles R, Baughman RH, Clark GM, Wallace GG, Kapsa RMI. Myo-regenerative Scaffolds: Electrical Stimulation of Myoblast Proliferation and Differentiation on Aligned Nanostructured Conductive Polymer Platforms (Adv. Healthcare Mater. 6/2012). Adv Healthc Mater 2012. [DOI: 10.1002/adhm.201290032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Quigley AF, Razal JM, Kita M, Jalili R, Gelmi A, Penington A, Ovalle-Robles R, Baughman RH, Clark GM, Wallace GG, Kapsa RMI. Electrical stimulation of myoblast proliferation and differentiation on aligned nanostructured conductive polymer platforms. Adv Healthc Mater 2012. [PMID: 23184836 DOI: 10.1002/adhm.201200102] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Anita F Quigley
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, Australia
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Quigley AF, Razal JM, Thompson BC, Moulton SE, Kita M, Kennedy EL, Clark GM, Wallace GG, Kapsa RMI. Nerve repair: a conducting-polymer platform with biodegradable fibers for stimulation and guidance of axonal growth (adv. Mater. 43/2009). Adv Mater 2009; 21:NA-NA. [PMID: 26042954 DOI: 10.1002/adma.200990160] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Effective functional innervation of medical bionic devices, as well as re-innervation of target tissue in nerve and spinal cord injuries, requires a platform that can stimulate and orientate neural growth. Gordon Wallace and co-workers report on p. 4393 that conducting and nonconducting biodegradable polymers show excellent potential as suitable hybrid substrata for neural regeneration and may form the basis of electrically active conduits designed to accelerate nerve repair.
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Affiliation(s)
- Anita F Quigley
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia)
- Centre for Clinical Neuroscience and Neurology Research Department of Medicine, St. Vincent's Hospital 41 Victoria Pde Fitzroy, VIC 3065 (Australia)
- Bionic Ear Institute 384-388 Albert St East Melbourne, VIC 3002 (Australia)
| | - Joselito M Razal
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia)
| | - Brianna C Thompson
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia)
| | - Simon E Moulton
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia)
| | - Magdalena Kita
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia)
- Centre for Clinical Neuroscience and Neurology Research Department of Medicine, St. Vincent's Hospital 41 Victoria Pde Fitzroy, VIC 3065 (Australia)
- Bionic Ear Institute 384-388 Albert St East Melbourne, VIC 3002 (Australia)
| | | | - Graeme M Clark
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia)
- Bionic Ear Institute 384-388 Albert St East Melbourne, VIC 3002 (Australia)
| | - Gordon G Wallace
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia).
| | - Robert M I Kapsa
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia)
- Centre for Clinical Neuroscience and Neurology Research Department of Medicine, St. Vincent's Hospital 41 Victoria Pde Fitzroy, VIC 3065 (Australia)
- Bionic Ear Institute 384-388 Albert St East Melbourne, VIC 3002 (Australia)
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Quigley AF, Razal JM, Thompson BC, Moulton SE, Kita M, Kennedy EL, Clark GM, Wallace GG, Kapsa RMI. A conducting-polymer platform with biodegradable fibers for stimulation and guidance of axonal growth. Adv Mater 2009; 21:4393-4397. [PMID: 26042951 DOI: 10.1002/adma.200901165] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2009] [Indexed: 06/04/2023]
Abstract
A biosynthetic platform composed of a conducting polypyrrole sheet embedded with unidirectional biodegradable polymer fibers is described (see image; scale bar = 50 µm). Such hybrid systems can promote rapid directional nerve growth for neuro-regenerative scaffolds and act as interfaces between the electronic circuitry of medical bionic devices and the nervous system.
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Affiliation(s)
- Anita F Quigley
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia)
- Centre for Clinical Neuroscience and Neurology Research Department of Medicine, St. Vincent's Hospital 41 Victoria Pde Fitzroy, VIC 3065 (Australia)
- Bionic Ear Institute 384-388 Albert St East Melbourne, VIC 3002 (Australia)
| | - Joselito M Razal
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia)
| | - Brianna C Thompson
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia)
| | - Simon E Moulton
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia)
| | - Magdalena Kita
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia)
- Centre for Clinical Neuroscience and Neurology Research Department of Medicine, St. Vincent's Hospital 41 Victoria Pde Fitzroy, VIC 3065 (Australia)
- Bionic Ear Institute 384-388 Albert St East Melbourne, VIC 3002 (Australia)
| | | | - Graeme M Clark
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia)
- Bionic Ear Institute 384-388 Albert St East Melbourne, VIC 3002 (Australia)
| | - Gordon G Wallace
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia).
| | - Robert M I Kapsa
- ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute University of Wollongong Northfields Avenue Wollongong, NSW 2522 (Australia)
- Centre for Clinical Neuroscience and Neurology Research Department of Medicine, St. Vincent's Hospital 41 Victoria Pde Fitzroy, VIC 3065 (Australia)
- Bionic Ear Institute 384-388 Albert St East Melbourne, VIC 3002 (Australia)
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Wong SHA, Lowes KN, Bertoncello I, Quigley AF, Simmons PJ, Cook MJ, Kornberg AJ, Kapsa RMI. Evaluation of Sca-1 and c-Kit As Selective Markers for Muscle Remodelling by Nonhemopoietic Bone Marrow Cells. Stem Cells 2007; 25:1364-74. [PMID: 17303817 DOI: 10.1634/stemcells.2006-0194] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Bone marrow (BM)-derived cells (BMCs) have demonstrated a myogenic tissue remodeling capacity. However, because the myoremodeling is limited to approximately 1%-3% of recipient muscle fibers in vivo, there is disagreement regarding the clinical relevance of BM for therapeutic application in myodegenerative conditions. This study sought to determine whether rare selectable cell surface markers (in particular, c-Kit) could be used to identify a BMC population with enhanced myoremodeling capacity. Dystrophic mdx muscle remodeling has been achieved using BMCs sorted by expression of stem cell antigen-1 (Sca-1). The inference that Sca-1 is also a selectable marker associated with myoremodeling capacity by muscle-derived cells prompted this study of relative myoremodeling contributions from BMCs (compared with muscle cells) on the basis of expression or absence of Sca-1. We show that myoremodeling activity does not differ in cells sorted solely on the basis of Sca-1 from either muscle or BM. In addition, further fractionation of BM to a more mesenchymal-like cell population with lineage markers and CD45 subsequently revealed a stronger selectability of myoremodeling capacity with c-Kit/Sca-1 (p < .005) than with Sca-1 alone. These results suggest that c-Kit may provide a useful selectable marker that facilitates selection of cells with an augmented myoremodeling capacity derived from BM and possibly from other nonmuscle tissues. In turn, this may provide a new methodology for rapid isolation of myoremodeling capacities from muscle and nonmuscle tissues. Disclosure of potential conflicts of interest is found at the end of this article.
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Affiliation(s)
- Sharon H A Wong
- National Muscular Dystrophy Research Centre, Department of Clinical Neurosciences, St. Vincent's Hospital, 35 Victoria Parade, Fitzroy, Victoria, 3065, Australia
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Wong SHA, Lowes KN, Quigley AF, Marotta R, Kita M, Byrne E, Kornberg AJ, Cook MJ, Kapsa RMI. DNA electroporation in vivo targets mature fibres in dystrophic mdx muscle. Neuromuscul Disord 2005; 15:630-41. [PMID: 16084723 DOI: 10.1016/j.nmd.2005.04.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2005] [Revised: 04/21/2005] [Accepted: 04/27/2005] [Indexed: 11/25/2022]
Abstract
Non-viral gene transfer into skeletal muscle is enhanced by electroporation and myotoxin preconditioning of muscle following plasmid injection. We investigated in vivo delivery of naked DNA to mdx mouse muscle, utilising enhanced green fluorescent protein reporter vector (pEGFP) and a corrective nucleic acid to promote targeted corrective gene conversion at the mutant mdx mouse dystrophin (DMDmdx) locus. Electroporation, myoablation with bupivacaine and a combined protocol, were applied to mdx muscle. We report up to 90% EGFP expression in electroporated mdx tibialis anterior muscle. Muscles preconditioned with bupivacaine showed low transgene expression with or without EP. Single EGFP+ve muscle fibre explants showed EGFP expression in mature fibres in preference to satellite cells. We observed a two-fold increase (P<0.005; t) in dystrophin protein, accompanied by wild-type (wt) DMD transcript in muscles injected with corrective nucleic acid over contralateral saline-injected TAs. By targeting the muscle fibres in preference to the satellite cells, plasmid-bourne transgenes delivered to dystrophic muscle will not penetrate the regenerative component of muscle. Whether in the context of targeted corrective gene conversion or therapeutic non-viral transgenes, under these conditions periodic re-administration will be required to promote phenotypic benefits in dystrophic muscle.
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Affiliation(s)
- Sharon H A Wong
- National Muscular Dystrophy Research Centre, Howard Florey Institute, Parkville, Victoria 3010, Australia
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Kapsa RMI, Wong SHA, Bertoncello I, Quigley AF, Williams B, Sells K, Marotta R, Kita M, Simmons P, Byrne E, Kornberg AJ. CD45 fraction bone marrow cells as potential delivery vehicles for genetically corrected dystrophin loci. Neuromuscul Disord 2002; 12 Suppl 1:S61-6. [PMID: 12206798 DOI: 10.1016/s0960-8966(02)00084-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Targeted correction of mutations in muscle can be delivered by direct i.m. injection of corrective DNA to the dystrophic muscle or by autologous injection of cells that have been genetically corrected after isolation from the individual with the dystrophic muscle. The successful application of chimeraplasty and short fragment homologous replacement to correct the exon 23 nonsense mdx transition at the mouse dys locus has opened up the possibility that with further development, targeted gene correction may have some future application for the treatment of muscular dystrophies. In vitro, application of targeted gene correction at the mdx dys locus results in better correction efficiencies than when applied directly to dystrophic muscle. This suggests that at least for the time being, a strategy involving ex vivo correction may be advantageous over a direct approach for delivery of gene correction to dystrophic muscle. This, particularly in view of recent developments indicating that bone-marrow-derived cells are able to systemically remodel dystrophic muscle, whilst penetration of DNA introduced to muscle is limited to individually injected muscles. Application of targeted gene correction to Duchenne dystrophy needs to account for the fact that about 65% of Duchenne muscular dystrophy cases involve large frame-shift deletion of gene sequence at the dys locus. Traditionally, whilst targeted gene correction is able to restore point mutations entirely, it remains to be seen as to whether a strategy for the 'correction' of frame shift deletions may be engineered successfully. This communication discusses the possibility of applying targeted gene correction to dystrophic muscle in Duchenne dystrophy.
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Affiliation(s)
- R M I Kapsa
- Melbourne Neuromuscular Research Institute, Clinical Neurosciences, St Vincent's Hospital, Fitzroy, Victoria, 3065, Australia.
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Kapsa RM, Quigley AF, Vadolas J, Steeper K, Ioannou PA, Byrne E, Kornberg AJ. Targeted gene correction in the mdx mouse using short DNA fragments: towards application with bone marrow-derived cells for autologous remodeling of dystrophic muscle. Gene Ther 2002; 9:695-9. [PMID: 12032690 DOI: 10.1038/sj.gt.3301737] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In muscle, mutant genes can be targeted and corrected directly by intramuscular (i.m.) injection of corrective DNA, or by ex vivo delivery of DNA to myogenic cells, followed by cell transplantation. Short fragment homologous replacement (SFHR) has been used to repair the exon 23 nonsense transition at the Xp21.1 dys locus in cultured cells and also, directly in tibialis anterior from male mdx mice. Whilst mdx dys locus correction can be achieved in up to 20% of cells in culture, much lower efficiency is evident by i.m. injection. The major consideration for application of targeted gene correction to muscle is delivery throughout relevant tissues. Systemically injected bone marrow (BM)-derived cells from wt C57BL/10 ScSn mice are known to remodel mdx muscle when injected into the systemic route. Provided that non muscle-derived cell types most capable of muscle remodeling activity can be more specifically identified, isolated and expanded, cell therapy seems presently the most favorable vehicle by which to deliver gene correction throughout muscle tissues. Using wt bone marrow as a model, this study investigates systemic application of bone marrow-derived cells as potential vehicles to deliver corrected (ie wt) dys locus to dystrophic muscle. Intravenous (i.v.) and intraperitoneal (i.p.) injections of wt BM were given to lethally and sub-lethally irradiated mdx mice. Despite both i.v. and surviving i.p. groups containing wt dys loci in 100% and less than 1% of peripheral blood nuclei, respectively, both groups displayed equivalent levels of wt dys transcript in muscle RNA. These results suggest that the muscle remodeling activity observed in systemically injected BM cells is not likely to be found in the hemopoietic fraction.
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Affiliation(s)
- R M Kapsa
- Melbourne Neuromuscular Research Institute, Clinical Neurosciences, St Vincent's Hospital, Fitzroy Victoria, Australia
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Abstract
BACKGROUND Cardiomyopathy is well recognized in mitochondrial diseases in which it has been associated with defects of mitochondrial function, including cytochrome-c oxidase (COX) deficiencies. This study explores the respiratory chain activity, particularly of COX, in patients with cardiomyopathy to determine whether a relationship exists between respiratory enzyme activity and cardiac function. METHODS AND RESULTS Myocardial specimens from the left ventricular wall of explanted hearts were obtained from subjects with ischemic (n = 6) or nonischemic dilated (n = 8) cardiomyopathy. Assays for citrate synthase (CS) and complexes II/III and IV activity were performed on cardiac mitochondria and homogenate. Enzyme activities were normalized to CS activity and compared with control activities (n = 10). A significant reduction in COX and/or CS activity was identified in mitochondrial preparations from the transplant group and correlated significantly with ejection fraction (P < .05), although this does not prove a causal relationship. Significantly reduced CS activity in homogenate was identified, suggesting decreased mitochondrial volume in addition to decreased COX activity. Measurements in cardiac homogenates failed to show a significant reduction in COX activity (P > .05) in the transplant group, suggesting that the use of prefrozen tissue homogenates may underestimate existing mitochondrial respiratory defects in cardiac tissue. CONCLUSIONS Mitochondrial function is altered at a number of levels in end-stage cardiomyopathy. Defective COX activity resulting in deficient adenosine triphosphate generation may contribute to impaired ventricular function in heart failure. Agents capable of improving mitochondrial function may find an adjuvant role in the treatment of cardiac failure.
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Affiliation(s)
- A F Quigley
- Melbourne Neuromuscular Research Institute, St Vincent's Hospital, Fitzroy, Victoria, Australia
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Kapsa RM, Quigley AF, Han TF, Jean-Francois MJ, Vaughan P, Byrne E. mtDNA replicative potential remains constant during ageing: polymerase gamma activity does not correlate with age related cytochrome oxidase activity decline in platelets. Nucleic Acids Res 1998; 26:4365-73. [PMID: 9742236 PMCID: PMC147866 DOI: 10.1093/nar/26.19.4365] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Progressive age-related oxidative phosphorylation (OxPhos) decline is well known in human tissues. Depletion of mitochondrial DNA (mtDNA) causes OxPhos defects in patients with myopathic syndromes and deficient mtDNA replication has been observed in cells cultured from patients with mitochondrial disease. Patients undergoing treatment for AIDS develop OxPhos defects via mtDNA depletion resulting from inhibition of mtDNA polymerase gamma (Polgamma) by 2'-deoxy 3'-azido thymidine. These findings by others give rise to a possible link between mtDNA replication and bioenergetic decline in disease and during ageing. We have designed an in vitro assay for Polgamma function in small tissue samples to explore this possible link. Platelet homogenate Polgamma showed an activity with a K m of 150 microM (dTTP), a V max of 11.8 pmol/min/mg, inhibited (41% inhibition; 50 microM) by ethidium bromide. Determination of several storage characteristics showed that platelets were a convenient source of Polgamma for assay. Polgamma activity in 45 subjects did not coincide with significant age-related decline (P<0.002; P) observed in cytochrome oxidase (CytOx) activity or with citrate synthase activity. Of the activities studied, the only significant age-wise variation was a 24% CytOx deficiency in elderly (>50; n = 19) compared to young (<51; n = 24) individuals (P<0.01; t). These results suggest a maintenance of total cellular mtDNA Polgamma processive levels during ageing, largely independent of total cellular bioenergetic status or mitochondrial number/density. The processive component of Polgamma is therefore unlikely to make a major contribution to age-related bioenergetic activity decline. This does not, however, preclude the possibility that transient periods of inhibition at crucial points of the cell cycle or development may augment existing intracellular deficiencies. The assay described here greatly facilitates study of Polgamma activity in patients with conditions involving mtDNA depletion or rearrangement.
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Affiliation(s)
- R M Kapsa
- Melbourne Neuromuscular Research Centre and Department of Clinical CSIRO Division of Molecular Science, Parkville Laboratory, Parkville, Victoria 3052, Australia.
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