1
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Jabber Al-Saady MAA, Aldujaili NH, Rabeea Banoon S, Al-Abboodi A. Antimicrobial properties of nanoparticles in biofilms. BIONATURA 2022; 7:1-9. [DOI: 10.21931/rb/2022.07.04.71] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023] Open
Abstract
Biofilm is a structure in the shape of a surface adherent composed of a microbe’s community and plays a crucial role in stimulating the infection. Due to the Biofilm’s complex structure compared with the individual microbe, it occasionally develops recalcitrant to the host immune system, which may lead to antibiotic resistance. The National Institutes of Health has reported that more than 80% of bacterial infections are caused by biofilm formation. Removing biofilm-mediated infections is an immense challenge that should involve various strategies that may induce sensitive and effective antibiofilm therapy. In the last decade, nanoparticle NPs application has been employed as one of the strategies that have grown great stimulus to target antibiofilm treatment due to their unique properties. Nanobiotechnology holds promise for the future because it has various antimicrobial properties in biofilms and promising new drug delivery methods that stand out from conventional antibiotics. Studying the interaction between the Biofilm and the nanoparticles can deliver additional insights regarding the mechanism of biofilm regulation. This review article will define synthetic nanoparticle NPs, their medical applications, and their potential use against a broad range of microbial biofilms in the coming years. The motivation of the current review is to focus on NPs materials’ properties and applications and their use as antimicrobial agents to fight resistant infections, which can locally terminate bacteria without being toxic to the surrounding tissue and share its role in improving human health in the future.
Keywords: Biofilms, antimicrobial, nanoparticles, bio-nanotechnology, drug resistance.
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Affiliation(s)
- Mohammed Abd Ali Jabber Al-Saady
- AL Sader Teaching Hospital, Maysan Health Directorate, Ministry of Health, Maysan, Iraq, Department of Mechanical and Aerospace Engineering, Monash University, VIC 3800, Australia
| | - Nawfal H. Aldujaili
- Department of Biology, Faculty of Science, University of Kufa, Najaf, Iraq, Alameen Center for Advanced Research and Biotechnology, Imam Ali Holy Shrine, Najaf, Iraq
| | | | - Aswan Al-Abboodi
- Department of Biology, College of Science, University of Misan, Maysan, Iraq
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2
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Al-Abboodi A, Zhang S, Al-Saady M, Ong JW, Chan PPY, Fu J. Printing
in situ
tissue sealant with visible-light-crosslinked porous hydrogel. Biomed Mater 2019; 14:045010. [DOI: 10.1088/1748-605x/ab19fe] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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3
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Mochalov KE, Chistyakov AA, Solovyeva DO, Mezin AV, Oleinikov VA, Vaskan IS, Molinari M, Agapov II, Nabiev I, Efimov AE. An instrumental approach to combining confocal microspectroscopy and 3D scanning probe nanotomography. Ultramicroscopy 2017; 182:118-123. [DOI: 10.1016/j.ultramic.2017.06.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Revised: 06/02/2017] [Accepted: 06/19/2017] [Indexed: 01/09/2023]
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4
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Hamngren Blomqvist C, Gebäck T, Altskär A, Hermansson AM, Gustafsson S, Lorén N, Olsson E. Interconnectivity imaged in three dimensions: Nano-particulate silica-hydrogel structure revealed using electron tomography. Micron 2017; 100:91-105. [PMID: 28558343 DOI: 10.1016/j.micron.2017.04.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 04/27/2017] [Accepted: 04/27/2017] [Indexed: 11/29/2022]
Abstract
We have used Electron Tomography (ET) to reveal the detailed three-dimensional structure of particulate hydrogels, a material category common in e.g. controlled release, food science, battery and biomedical applications. A full understanding of the transport properties of these gels requires knowledge about the pore structure and in particular the interconnectivity in three dimensions, since the transport takes the path of lowest resistance. The image series for ET were recorded using High-Angle Annular Dark Field Scanning Transmission Electron Microscopy (HAADF-STEM). We have studied three different particulate silica hydrogels based on primary particles with sizes ranging from 3.6nm to 22nm and with pore-size averages from 18nm to 310nm. Here, we highlight the nanostructure of the particle network and the interpenetrating pore network in two and three dimensions. The interconnectivity and distribution of width of the porous channels were obtained from the three-dimensional tomography studies while they cannot unambiguously be obtained from the two-dimensional data. Using ET, we compared the interconnectivity and accessible pore volume fraction as a function of pore size, based on direct images on the nanoscale of three different hydrogels. From this comparison, it was clear that the finest of the gels differentiated from the other two. Despite the almost identical flow properties of the two finer gels, they showed large differences concerning the accessible pore volume fraction for probes corresponding to their (two-dimensional) mean pore size. Using 2D pore size data, the finest gel provided an accessible pore volume fraction of over 90%, but for the other two gels the equivalent was only 10-20%. However, all the gels provided an accessible pore volume fraction of 30-40% when taking the third dimension into account.
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Affiliation(s)
- C Hamngren Blomqvist
- Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden; SuMo Biomaterials, VINN Excellence Centre, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - T Gebäck
- SuMo Biomaterials, VINN Excellence Centre, Chalmers University of Technology, S-412 96 Göteborg, Sweden; Mathematical Sciences, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - A Altskär
- SuMo Biomaterials, VINN Excellence Centre, Chalmers University of Technology, S-412 96 Göteborg, Sweden; Product Design and Perception, RISE Agrifood and Bioscience, Frans Perssons väg 6, S-402 29 Göteborg, Sweden
| | - A-M Hermansson
- SuMo Biomaterials, VINN Excellence Centre, Chalmers University of Technology, S-412 96 Göteborg, Sweden; Chemical and Biological Engineering, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - S Gustafsson
- Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden
| | - N Lorén
- Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden; SuMo Biomaterials, VINN Excellence Centre, Chalmers University of Technology, S-412 96 Göteborg, Sweden; Product Design and Perception, RISE Agrifood and Bioscience, Frans Perssons väg 6, S-402 29 Göteborg, Sweden
| | - E Olsson
- Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden; SuMo Biomaterials, VINN Excellence Centre, Chalmers University of Technology, S-412 96 Göteborg, Sweden.
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5
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Efimov AE, Agapova OI, Safonova LA, Bobrova MM, Volkov AD, Khamkhash L, Agapov II. Cryo scanning probe nanotomography study of the structure of alginate microcarriers. RSC Adv 2017. [DOI: 10.1039/c6ra26516b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Nanostructure of microparticles of decellularized rat liver ECM on spherical alginate hydrogel microcarriers is analyzed by cryo scanning probe nanotomography.
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Affiliation(s)
- Anton E. Efimov
- Laboratory of Bionanotechnology
- V.I.Shumakov Federal Research Center of Transplantology and Artificial Organs
- Moscow
- 123182 Russia
- SNOTRA LLC
| | - Olga I. Agapova
- Laboratory of Bionanotechnology
- V.I.Shumakov Federal Research Center of Transplantology and Artificial Organs
- Moscow
- 123182 Russia
| | - Liubov A. Safonova
- Laboratory of Bionanotechnology
- V.I.Shumakov Federal Research Center of Transplantology and Artificial Organs
- Moscow
- 123182 Russia
- Bioengineering Department
| | - Maria M. Bobrova
- Laboratory of Bionanotechnology
- V.I.Shumakov Federal Research Center of Transplantology and Artificial Organs
- Moscow
- 123182 Russia
- Bioengineering Department
| | - Alexey D. Volkov
- National Laboratory Astana
- Nazarbayev University
- 010000 Astana
- Kazakhstan
| | - Laura Khamkhash
- National Laboratory Astana
- Nazarbayev University
- 010000 Astana
- Kazakhstan
| | - Igor I. Agapov
- Laboratory of Bionanotechnology
- V.I.Shumakov Federal Research Center of Transplantology and Artificial Organs
- Moscow
- 123182 Russia
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6
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Bradley RS, Robinson IK, Yusuf M. 3D X-Ray Nanotomography of Cells Grown on Electrospun Scaffolds. Macromol Biosci 2016; 17. [DOI: 10.1002/mabi.201600236] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 08/09/2016] [Indexed: 02/03/2023]
Affiliation(s)
- Robert S. Bradley
- Henry Moseley X-ray Imaging Facility; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Ian K. Robinson
- London Centre for Nanotechnology; University College London; Gower Street London WC1E 6BT UK
- Rutherford Appleton Laboratory; Didcot OX11 0FA UK
| | - Mohammed Yusuf
- London Centre for Nanotechnology; University College London; Gower Street London WC1E 6BT UK
- Rutherford Appleton Laboratory; Didcot OX11 0FA UK
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7
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Ramesan S, Rezk AR, Cheng KW, Chan PPY, Yeo LY. Acoustically-driven thread-based tuneable gradient generators. LAB ON A CHIP 2016; 16:2820-2828. [PMID: 27334420 DOI: 10.1039/c5lc00937e] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Thread-based microfluidics offer a simple, easy to use, low-cost, disposable and biodegradable alternative to conventional microfluidic systems. While it has recently been shown that such thread networks facilitate manipulation of fluid samples including mixing, flow splitting and the formation of concentration gradients, the passive capillary transport of fluid through the thread does not allow for precise control due to the random orientation of cellulose fibres that make up the thread, nor does it permit dynamic manipulation of the flow. Here, we demonstrate the use of high frequency sound waves driven from a chip-scale device that drives rapid, precise and uniform convective transport through the thread network. In particular, we show that it is not only possible to generate a stable and continuous concentration gradient in a serial dilution and recombination network, but also one that can be dynamically tuned, which cannot be achieved solely with passive capillary transport. Additionally, we show a proof-of-concept in which such spatiotemporal gradient generation can be achieved with the entire thread network embedded in a three-dimensional hydrogel construct to more closely mimic the in vivo tissue microenvironment in microfluidic chemotaxis studies and cell culture systems, which is then employed to demonstrate the effect of such gradients on the proliferation of cells within the hydrogel.
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Affiliation(s)
- Shwathy Ramesan
- Micro/Nanophysics Research Laboratory, RMIT University, Melbourne, VIC 3000, Australia.
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8
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Chun YY, Wang JK, Tan NS, Chan PPY, Tan TTY, Choong C. A Periosteum-Inspired 3D Hydrogel-Bioceramic Composite for Enhanced Bone Regeneration. Macromol Biosci 2015; 16:276-87. [DOI: 10.1002/mabi.201500258] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 09/15/2015] [Indexed: 12/12/2022]
Affiliation(s)
- Yong Yao Chun
- School of Chemical and Biomedical Engineering; Nanyang Technological University; 62 Nanyang Drive Singapore 637459 Singapore
| | - Jun Kit Wang
- Residues and Resource Reclamation Centre (R3C), Nanyang Environment and Water Research Institute (NEWRI); Nanyang Technological University; 1 Cleantech Loop Singapore 637141 Singapore
- Interdisciplinary Graduate School; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore
| | - Nguan Soon Tan
- School of Biological Science; Nanyang Technological University; 60 Nanyang Drive, Singapore 637551 Singapore
- Institute of Molecular and Cell Biology; 61 Biopolis Drive Proteos, A*STAR Singapore 138673 Singapore
- KK Research Centre, KK Women's and Children Hospital; 100 Bukit Timah Road Singapore 229899
| | - Peggy Puk Yik Chan
- Department of Telecommunications Electrical Robotics and Biomedical Engineering; Swinburne University of Technology; Hawthorn Victoria 3122 Australia
- Melbourne Centre for Nanofabrication; Clayton 3168 Australia
| | - Timothy Thatt Yang Tan
- School of Chemical and Biomedical Engineering; Nanyang Technological University; 62 Nanyang Drive Singapore 637459 Singapore
| | - Cleo Choong
- KK Research Centre, KK Women's and Children Hospital; 100 Bukit Timah Road Singapore 229899
- School of Materials Science and Engineering; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798 Singapore
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9
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Adineh VR, Liu B, Rajan R, Yan W, Fu J. Multidimensional characterisation of biomechanical structures by combining Atomic Force Microscopy and Focused Ion Beam: A study of the rat whisker. Acta Biomater 2015; 21:132-41. [PMID: 25839121 DOI: 10.1016/j.actbio.2015.03.028] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Revised: 03/23/2015] [Accepted: 03/23/2015] [Indexed: 01/13/2023]
Abstract
Understanding the heterogeneity of biological structures, particularly at the micro/nano scale can offer insights valuable for multidisciplinary research in tissue engineering and biomimicry designs. Here we propose to combine nanocharacterisation tools, particularly Focused Ion Beam (FIB) and Atomic Force Microscopy (AFM) for three dimensional mapping of mechanical modulus and chemical signatures. The prototype platform is applied to image and investigate the fundamental mechanics of the rat face whiskers, a high-acuity sensor used to gain detailed information about the world. Grazing angle FIB milling was first applied to expose the interior cross section of the rat whisker sample, followed by a "lift-out" method to retrieve and position the target sample for further analyses. AFM force spectroscopy measurements revealed a non-uniform pattern of elastic modulus across the cross section, with a range from 0.8GPa to 13.5GPa. The highest elastic modulus was found at the outer cuticle region of the whisker, and values gradually decreased towards the interior cortex and medulla regions. Elemental mapping with EDS confirmed that the interior of the rat whisker is dominated by C, O, N, S, Cl and K, with a significant change of elemental distribution close to the exterior cuticle region. Based on these data, a novel comprehensive three dimensional (3D) elastic modulus model was constructed, and stress distributions under realistic conditions were investigated with Finite Element Analysis (FEA). The simulations could well account for the passive whisker deflections, with calculated resonant frequency as well as force-deflection for the whiskers being in good agreement with reported experimental data. Limitations and further applications are discussed for the proposed FIB/AFM approach, which holds good promise as a unique platform to gain insights on various heterogeneous biomaterials and biomechanical systems.
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Affiliation(s)
- Vahid Reza Adineh
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Boyin Liu
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Ramesh Rajan
- Department of Physiology, Monash University, Clayton, VIC 3800, Australia
| | - Wenyi Yan
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Jing Fu
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia.
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10
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Abstract
This chapter describes the preparation of tissue engineered constructs by immobilizing chondrocytes in hydrogel with independently tunable porosity and mechanical properties. This chapter also presents the methods to characterize these tissue engineered constructs. The resulting tissue engineered constructs can be useful for the generation of cartilage tissue both in vitro and in vivo.
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11
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Abuelfilat AY, Kim Y, Miller P, Hoo SP, Li J, Chan P, Fu J. Bridging structure and mechanics of three-dimensional porous hydrogel with X-ray ultramicroscopy and atomic force microscopy. RSC Adv 2015. [DOI: 10.1039/c5ra10942f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
By combining phase contrast X-ray ultramicroscopy and nanoindentation with atomic force microscopy, the mechanics of individual hydrogel pores as well as their collective performance as a scaffold can be modelled and simulated.
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Affiliation(s)
- A. Y. Abuelfilat
- Department of Mechanical and Aerospace Engineering
- Monash University
- Clayton
- Australia
| | - Y. Kim
- Department of Mechanical and Aerospace Engineering
- Monash University
- Clayton
- Australia
| | - P. Miller
- Monash Centre for Electron Microscopy
- Clayton
- Australia
| | - S. P. Hoo
- Department of Biomedical Engineering
- Swinburne University of Technology
- Hawthorn
- Australia
| | - J. Li
- Department of Mechanical and Aerospace Engineering
- Monash University
- Clayton
- Australia
| | - P. Chan
- Department of Biomedical Engineering
- Swinburne University of Technology
- Hawthorn
- Australia
| | - J. Fu
- Department of Mechanical and Aerospace Engineering
- Monash University
- Clayton
- Australia
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12
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Kim Y, Abuelfilat AY, Hoo SP, Al-Abboodi A, Liu B, Ng T, Chan P, Fu J. Tuning the surface properties of hydrogel at the nanoscale with focused ion irradiation. SOFT MATTER 2014; 10:8448-8456. [PMID: 25225831 DOI: 10.1039/c4sm01061b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
With the site-specific machining capability of Focused Ion Beam (FIB) irradiation, we aim to tailor the surface morphology and physical attributes of biocompatible hydrogel at the nano/micro scale particularly for tissue engineering and other biomedical studies. Thin films of Gtn-HPA/CMC-Tyr hydrogels were deposited on a gold-coated substrate and were subjected to irradiation with a kiloelectronvolt (keV) gallium ion beam. The sputtering yield, surface morphology and mechanical property changes were investigated using Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and Monte Carlo simulations. The sputtering yield of the hydrogel was found to be approximately 0.47 μm(3) nC(-1) compared with Monte-Carlo simulation results of 0.09 μm(3) nC(-1). Compared to the surface roughness of the pristine hydrogel at approximately 2 nm, the average surface roughness significantly increased with the increase of ion fluence with measurements extended to 20 nm at 100 pC μm(-2). Highly packed submicron porous patterns were also revealed with AFM, while significantly decreased pore sizes and increased porosity were found with ion irradiation at oblique incidence. The Young's modulus of irradiated hydrogel determined using AFM force spectroscopy was revealed to be dependent on ion fluence. Compared to the original Young's modulus value of 20 MPa, irradiation elevated the value to 250 MPa and 350 MPa at 1 pC μm(-2) and 100 pC μm(-2), respectively. Cell culture studies confirmed that the irradiated hydrogel samples were biocompatible, and the generated nanoscale patterns remained stable under physiological conditions.
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Affiliation(s)
- Y Kim
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia.
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13
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Efimov AE, Moisenovich MM, Bogush VG, Agapov II. 3D nanostructural analysis of silk fibroin and recombinant spidroin 1 scaffolds by scanning probe nanotomography. RSC Adv 2014. [DOI: 10.1039/c4ra08341e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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14
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Harrison RH, St-Pierre JP, Stevens MM. Tissue engineering and regenerative medicine: a year in review. TISSUE ENGINEERING PART B-REVIEWS 2014; 20:1-16. [PMID: 24410501 DOI: 10.1089/ten.teb.2013.0668] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
It is an exciting time to be involved in tissue engineering and regenerative medicine (TERM) research. Despite its relative youth, the field is expanding fast and breaking new ground in both the laboratory and clinically. In this "Year in Review," we highlight some of the high-impact advances in the field. Building upon last year's article, we have identified the recent "hot topics" and the key publications pertaining to these themes as well as ideas that have high potential to direct the field. Based on a modified methodology grounded on last year's approach, we have identified and summarized some of the most impactful publications in five main themes: (1) pluripotent stem cells: efforts and hurdles to translation, (2) tissue engineering: complex scaffolds and advanced materials, (3) directing the cell phenotype: growth factor and biomolecule presentation, (4) characterization: imaging and beyond, and (5) translation: preclinical to clinical. We have complemented our review of the research directions highlighted within these trend-setting studies with a discussion of additional articles along the same themes that have recently been published and have yet to surface in citation analyses. We conclude with a discussion of some really interesting studies that provide a glimpse of the high potential for innovation of TERM research.
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Affiliation(s)
- Rachael H Harrison
- 1 Department of Materials, Imperial College London , London, United Kingdom
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15
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Al-Abboodi A, Tjeung R, Doran PM, Yeo LY, Friend J, Yik Chan PP. In situ generation of tunable porosity gradients in hydrogel-based scaffolds for microfluidic cell culture. Adv Healthc Mater 2014; 3:1655-70. [PMID: 24711346 DOI: 10.1002/adhm.201400072] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2014] [Revised: 03/09/2014] [Indexed: 12/27/2022]
Abstract
Compared with preformed anisotropic matrices, an anisotropic matrix that allows users to alter its properties and structure in situ after synthesis offers the important advantage of being able to mimic dynamic in vivo microenvironments, such as in tissues undergoing morphogenesis or in wounds undergoing tissue repair. In this study, porous gradients are generated in situ in a hydrogel comprising enzymatically crosslinked gelatin hydroxyphenylpropionic acid (GTN-HPA) conjugate and carboxylmethyl cellulose tyramine (CMC-TYR) conjugate. The GTN-HPA component acts as the backbone of the hydrogel, while CMC-TYR acts as a biocompatible sacrificial polymer. The hydrogel is then used to immobilize HT1080 human fibrosarcoma cells in a microfluidic chamber. After diffusion of a biocompatible cellulase enzyme through the hydrogel in a spatially controlled manner, selective digestion of the CMC component of the hydrogel by the cellulase gives rise to a porosity gradient in situ instead of requiring its formation during hydrogel synthesis as with other methods. The influence of this in situ tunable porosity gradient on the chemotactic response of cancer cells is subsequently studied both in the absence and presence of chemoattractant. This platform illustrates the potential of hydrogel-based microfluidics to mimic the 3D in vivo microenvironment for tissue engineering and diagnostic applications.
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Affiliation(s)
- Aswan Al-Abboodi
- Department of Chemical Engineering; Monash University; Clayton VIC 3800
- Australia Mico/Nanophysics Research Laboratory; RMIT University; Melbourne VIC 3000 Australia
| | - Ricky Tjeung
- Mico/Nanophysics Research Laboratory; RMIT University; Melbourne VIC 3000 Australia
- Melbourne Centre for Nanofabrication; Australia National Fabrication Facility; Clayton VIC 3168 Australia
| | - Pauline M. Doran
- Faculty of Science, Engineering & Technology; Swinburne University of Technology Hawthorn; Melbourne VIC 3122 Australia
| | - Leslie Y. Yeo
- Mico/Nanophysics Research Laboratory; RMIT University; Melbourne VIC 3000 Australia
- Melbourne Centre for Nanofabrication; Australia National Fabrication Facility; Clayton VIC 3168 Australia
| | - James Friend
- Mico/Nanophysics Research Laboratory; RMIT University; Melbourne VIC 3000 Australia
- Melbourne Centre for Nanofabrication; Australia National Fabrication Facility; Clayton VIC 3168 Australia
| | - Peggy Pui Yik Chan
- Mico/Nanophysics Research Laboratory; RMIT University; Melbourne VIC 3000 Australia
- Melbourne Centre for Nanofabrication; Australia National Fabrication Facility; Clayton VIC 3168 Australia
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16
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Fon D, Al‐Abboodi A, Chan PPY, Zhou K, Crack P, Finkelstein DI, Forsythe JS. Effects of GDNF-loaded injectable gelatin-based hydrogels on endogenous neural progenitor cell migration. Adv Healthc Mater 2014; 3:761-74. [PMID: 24596339 DOI: 10.1002/adhm.201300287] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 10/11/2013] [Indexed: 12/21/2022]
Abstract
Brain repair following disease and injury is very limited due to difficulties in recruiting and mobilizing stem cells towards the lesion. More importantly, there is a lack of structural and trophic support to maintain viability of the limited stem/progenitor cells present. This study investigates the effectiveness of an injectable gelatin-based hydrogel in attracting neural progenitor cells (NPCs) from the subventricular zone (SVZ) towards the implant. Glial cell-line-derived neurotrophic factor (GDNF) encapsulated within the hydrogel and porosity within the hydrogel prevents glial scar formation. By directly targeting the hydrogel implant towards the SVZ, neuroblasts can actively migrate towards and along the implant tract. Significantly more doublecortin (DCX)-positive neuroblasts surround implants at 7 d post-implantation (dpi) compared with lesion alone controls, an effect that is enhanced when GDNF is incorporated into the hydrogels. Neuroblasts are not observed at the implant boundary at 21 dpi, indicating that neuroblast migration has halted, and neuroblasts have either matured or have not survived. The development of an injectable gelatin-based hydrogel has significant implications for the treatment of some neurodegenerative diseases and brain injuries. The ability of GDNF and porosity to effectively prevent glial scar formation will allow better integration and interaction between the implant and surrounding neural tissue.
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Affiliation(s)
- Deniece Fon
- Department of Materials Engineering Monash University Clayton VIC 3800 Australia
| | - Aswan Al‐Abboodi
- Department of Chemical Engineering Monash University Clayton VIC 3800 Australia
- Micro/Nanophysics Research Laboratory RMIT University Melbourne VIC 3000 Australia
| | - Peggy P. Y. Chan
- Micro/Nanophysics Research Laboratory RMIT University Melbourne VIC 3000 Australia
- Melbourne Centre for Nanofabrication Clayton VIC 3168 Australia
| | - Kun Zhou
- Department of Materials Engineering Monash University Clayton VIC 3800 Australia
| | - Peter Crack
- Department of Pharmacology The University of Melbourne Parkville VIC 3010 Australia
| | - David I. Finkelstein
- Florey Institute of Neuroscience and Mental Health, Parkville The University of Melbourne VIC 3010 Australia
| | - John S. Forsythe
- Department of Materials Engineering Monash University Clayton VIC 3800 Australia
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17
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Liu B, Yu HH, Ng TW, Paterson DL, Velkov T, Li J, Fu J. Nanoscale focused ion beam tomography of single bacterial cells for assessment of antibiotic effects. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2014; 20:537-547. [PMID: 24589280 DOI: 10.1017/s1431927614000026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Antibiotic resistance is a major risk to human health, and to provide valuable insights into mechanisms of resistance, innovative methods are needed to examine the cellular responses to antibiotic treatment. Focused ion beam tomography is proposed to image and assess the detailed three-dimensional (3D) ultrastructure of single bacterial cells. By iteratively removing slices of thickness in the order of 10 nm, high magnification 2D images can be acquired by scanning electron microscopy at single-digit nanometer resolution. In this study, Klebsiella pneumoniae was treated with polymyxin B, and 3D models of both cell envelope and cytoplasm regions containing the nucleoid and ribosomes were reconstructed. The 3D volume containing the nucleoid and ribosomes was significantly smaller, and the cell length along the longitudinal axis was extended by 40% in the treated cells, implying stress responses to the drug treatment. More than a 200% increase in protrusions per unit surface area on the cell envelope was observed in the curvature analysis after treatment. Experiments by conventional transmission electron microscopy and atomic force microscopy were also performed, followed by comparison and discussions. In conclusion, the proposed 3D imaging method and associated analysis provide a unique tool for the assessment of antibiotic effects on multidrug-resistant bacteria at nanometer resolution.
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Affiliation(s)
- Boyin Liu
- 1 Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Heidi H Yu
- 2 Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia
| | - Tuck Wah Ng
- 1 Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
| | - David L Paterson
- 3 Centre for Clinical Research, University of Queensland, Brisbane, QLD 4072, Australia
| | - Tony Velkov
- 2 Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia
| | - Jian Li
- 2 Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia
| | - Jing Fu
- 1 Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
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Mochalov KE, Efimov AE, Bobrovsky A, Agapov II, Chistyakov AA, Oleinikov V, Sukhanova A, Nabiev I. Combined scanning probe nanotomography and optical microspectroscopy: a correlative technique for 3D characterization of nanomaterials. ACS NANO 2013; 7:8953-8962. [PMID: 23991901 DOI: 10.1021/nn403448p] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Combination of 3D structural analysis with optical characterization of the same sample area on the nanoscale is a highly demanded approach in nanophotonics, materials science, and quality control of nanomaterial. We have developed a correlative microscopy technique where the 3D structure of the sample is reconstructed on the nanoscale by means of a "slice-and-view" combination of ultramicrotomy and scanning probe microscopy (scanning probe nanotomography, SPNT), and its optical characteristics are analyzed using microspectroscopy. This approach has been used to determine the direct quantitative relationship of the 3D structural characteristics of nanovolumes of materials with their microscopic optical properties. This technique has been applied to 3D structural and optical characterization of a hybrid material consisting of cholesteric liquid crystals doped with fluorescent quantum dots (QDs) that can be used for photochemical patterning and image recording through the changes in the dissymmetry factor of the circular polarization of QD emission. The differences in the polarization images and fluorescent spectra of this hybrid material have proved to be correlated with the arrangement of the areas of homogeneous distribution and heterogeneous clustering of QDs. The reconstruction of the 3D nanostructure of the liquid crystal matrix in the areas of homogeneous QDs distribution has shown that QDs do not perturb the periodic planar texture of the cholesteric liquid crystal matrix, whereas QD clusters do perturb it. The combined microspectroscopy-nanotomography technique will be important for evaluating the effects of nanoparticles on the structural organization of organic and liquid crystal matrices and biomedical materials, as well as quality control of nanotechnology fabrication processes and products.
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Affiliation(s)
- Konstantin E Mochalov
- Laboratory of Nano-bioengineering, National Research Nuclear University "Moscow Engineering Physics Institute", 115409 Moscow, Russian Federation
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Hoo SP, Loh QL, Yue Z, Fu J, Tan TTY, Choong C, Chan PPY. Preparation of a soft and interconnected macroporous hydroxypropyl cellulose methacrylate scaffold for adipose tissue engineering. J Mater Chem B 2013; 1:3107-3117. [DOI: 10.1039/c3tb00446e] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Henderson TMA, Ladewig K, Haylock DN, McLean KM, O'Connor AJ. Cryogels for biomedical applications. J Mater Chem B 2013; 1:2682-2695. [DOI: 10.1039/c3tb20280a] [Citation(s) in RCA: 193] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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