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Shafiei M, Ansari MNM, Razak SIA, Khan MUA. A Comprehensive Review on the Applications of Exosomes and Liposomes in Regenerative Medicine and Tissue Engineering. Polymers (Basel) 2021; 13:2529. [PMID: 34372132 PMCID: PMC8347192 DOI: 10.3390/polym13152529] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2021] [Revised: 07/26/2021] [Accepted: 07/27/2021] [Indexed: 12/12/2022] Open
Abstract
Tissue engineering and regenerative medicine are generally concerned with reconstructing cells, tissues, or organs to restore typical biological characteristics. Liposomes are round vesicles with a hydrophilic center and bilayers of amphiphiles which are the most influential family of nanomedicine. Liposomes have extensive research, engineering, and medicine uses, particularly in a drug delivery system, genes, and vaccines for treatments. Exosomes are extracellular vesicles (EVs) that carry various biomolecular cargos such as miRNA, mRNA, DNA, and proteins. As exosomal cargo changes with adjustments in parent cells and position, research of exosomal cargo constituents provides a rare chance for sicknesses prognosis and care. Exosomes have a more substantial degree of bioactivity and immunogenicity than liposomes as they are distinctly chiefly formed by cells, which improves their steadiness in the bloodstream, and enhances their absorption potential and medicinal effectiveness in vitro and in vivo. In this review, the crucial challenges of exosome and liposome science and their functions in disease improvement and therapeutic applications in tissue engineering and regenerative medicine strategies are prominently highlighted.
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Affiliation(s)
- Mojtaba Shafiei
- Bioinspired Device and Tissue Engineering Research Group, School of Biomedical Engineering and Health Sciences, Faculty of Engineering, Universiti Teknologi Malaysia, Skudai 81300, Johor, Malaysia; (M.S.); (M.U.A.K.)
| | | | - Saiful Izwan Abd Razak
- Bioinspired Device and Tissue Engineering Research Group, School of Biomedical Engineering and Health Sciences, Faculty of Engineering, Universiti Teknologi Malaysia, Skudai 81300, Johor, Malaysia; (M.S.); (M.U.A.K.)
| | - Muhammad Umar Aslam Khan
- Bioinspired Device and Tissue Engineering Research Group, School of Biomedical Engineering and Health Sciences, Faculty of Engineering, Universiti Teknologi Malaysia, Skudai 81300, Johor, Malaysia; (M.S.); (M.U.A.K.)
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2
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Wang X, Liu X, Huang X. Bioinspired Protein-Based Assembling: Toward Advanced Life-Like Behaviors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2001436. [PMID: 32374501 DOI: 10.1002/adma.202001436] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 04/05/2020] [Accepted: 04/06/2020] [Indexed: 06/11/2023]
Abstract
The ability of living organisms to perform structure, energy, and information-related processes for molecular self-assembly through compartmentalization and chemical transformation can possibly be mimicked via artificial cell models. Recent progress in the development of various types of functional microcompartmentalized ensembles that can imitate rudimentary aspects of living cells has refocused attention on the important question of how inanimate systems can transition into living matter. Hence, herein, the most recent advances in the construction of protein-bounded microcompartments (proteinosomes), which have been exploited as a versatile synthetic chassis for integrating a wide range of functional components and biochemical machineries, are critically summarized. The techniques developed for fabricating various types of proteinosomes are discussed, focusing on the significance of how chemical information, substance transportation, enzymatic-reaction-based metabolism, and self-organization can be integrated and recursively exploited in constructed ensembles. Therefore, proteinosomes capable of exhibiting gene-directed protein synthesis, modulated membrane permeability, spatially confined membrane-gated catalytic reaction, internalized cytoskeletal-like matrix assembly, on-demand compartmentalization, and predatory-like chemical communication in artificial cell communities are specially highlighted. These developments are expected to bridge the gap between materials science and life science, and offer a theoretical foundation for developing life-inspired assembled materials toward various applications.
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Affiliation(s)
- Xiaoliang Wang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Xiaoman Liu
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
| | - Xin Huang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China
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3
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Zhou Y, Carles G. Precise 3D particle localization over large axial ranges using secondary astigmatism. OPTICS LETTERS 2020; 45:2466-2469. [PMID: 32287260 DOI: 10.1364/ol.388695] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Accepted: 02/28/2020] [Indexed: 06/11/2023]
Abstract
We propose an analytical pupil phase function employing cropped secondary astigmatism for extended-depth nanoscale 3D-localization microscopy. The function provides high localization precision in all three dimensions, which can be maintained over extended axial ranges, customizable up to two orders of magnitude relative to the conventional, diffraction-limited imaging. This enables, for example, capturing nanoscale dynamics within a whole cell. The flexibility and simplicity in the implementation of the proposed phase function make its adoption in localization-based microscopy attractive. We demonstrate and validate its application to real-time imaging of 3D fluid flow over a depth of 40 µm with a numerical aperture of 0.8.
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Ta HT, Truong NP, Whittaker AK, Davis TP, Peter K. The effects of particle size, shape, density and flow characteristics on particle margination to vascular walls in cardiovascular diseases. Expert Opin Drug Deliv 2017; 15:33-45. [DOI: 10.1080/17425247.2017.1316262] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Hang T. Ta
- Australian Institute for Bioengineering and Nanotechnology, University of Queensland, Brisbane, Australia
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Australia
| | - Nghia P. Truong
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Australia
- Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Melbourne, Victoria, Australia
| | - Andrew K. Whittaker
- Australian Institute for Bioengineering and Nanotechnology, University of Queensland, Brisbane, Australia
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Australia
| | - Thomas P. Davis
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Australia
- Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Melbourne, Victoria, Australia
- Department of Chemistry, University of Warwick, Coventry, UK
| | - Karlheinz Peter
- Atherothrombosis and Vascular Laboratory, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
- Department of Medicine, Monash University, Melbourne, Australia
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5
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Winkler M, Abel M. Optimized setup for two-dimensional convection experiments in thin liquid films. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:065102. [PMID: 27370492 DOI: 10.1063/1.4950871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present a novel experimental setup to investigate two-dimensional thermal convection in a freestanding thin liquid film. Such films can be produced in a controlled way on the scale of 5-1000 nm. Our primary goal is to investigate convection patterns and the statistics of reversals in Rayleigh-Bénard convection with varying aspect ratio. Additionally, questions regarding the physics of liquid films under controlled conditions can be investigated, like surface forces, or stability under varying thermodynamical parameters. The film is suspended in a frame which can be adjusted in height and width to span an aspect ratio range of Γ = 0.16-10. The top and bottom frame elements can be set to specific temperature within T = 15 °C to 55 °C. A thickness to area ratio of approximately 10(8) enables only two-dimensional fluid motion in the time scales relevant for turbulent motion. The chemical composition of the film is well-defined and optimized for film stability and reproducibility and in combination with carefully controlled ambient parameters allows the comparison to existing experimental and numerical data.
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Affiliation(s)
- Michael Winkler
- Institute of Physics and Astronomy, University of Potsdam, 14476 Potsdam, Germany
| | - Markus Abel
- Institute of Physics and Astronomy, University of Potsdam, 14476 Potsdam, Germany
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Thompson AJ, Eniola-Adefeso O. Dense nanoparticles exhibit enhanced vascular wall targeting over neutrally buoyant nanoparticles in human blood flow. Acta Biomater 2015; 21:99-108. [PMID: 25870170 DOI: 10.1016/j.actbio.2015.04.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Revised: 03/09/2015] [Accepted: 04/06/2015] [Indexed: 01/20/2023]
Abstract
For vascular-targeting carrier (VTC) systems to be effective, carriers must be able to localize and adhere to the vascular wall at the target site. Research suggests that neutrally buoyant nanoparticles are limited by their inability to localize to the endothelium, making them sub-optimal as carriers. This study examines whether particle density can be exploited to improve the targeting (localization and adhesion) efficiency of nanospheres to the vasculature. Silica spheres with 500 nm diameter, which have a density roughly twice that of blood, exhibit improved adhesion to inflamed endothelium in an in vitro model of human vasculature compared to neutrally buoyant polystyrene spheres of the same size. Silica spheres also display better near-wall localization in the presence of red blood cells than they do in pure buffer, likely resulting in the observed improvement in adhesion. Titania spheres (4 times more dense than blood) adhere at levels higher than polystyrene, but only in conditions when gravity or centrifugal force acts in the direction of adhesion. In light of the wide array of materials proposed for use as carrier systems for drug delivery and diagnostics, particle density may be a useful tool for improving the targeting of diseased tissues.
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Affiliation(s)
- Alex J Thompson
- Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, United States
| | - Omolola Eniola-Adefeso
- Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, United States; Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, United States.
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Mizuno M, Toyota T, Konishi M, Kageyama Y, Yamada M, Seki M. Formation of monodisperse hierarchical lipid particles utilizing microfluidic droplets in a nonequilibrium state. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:2334-2341. [PMID: 25669326 DOI: 10.1021/acs.langmuir.5b00043] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A new microfluidic process was used to generate unique micrometer-sized hierarchical lipid particles having spherical lipid-core and multilamellar-shell structures. The process includes three steps: (1) formation of monodisperse droplets in a nonequilibrium state at a microchannel confluence, using a phospholipid-containing water-soluble organic solvent as the dispersed phase and water as the continuous phase; (2) dissolution of the organic solvent of the droplet into the continuous phase and concentration of the lipid molecules; and (3) reconstitution of multilamellar lipid membranes and simultaneous formation of a lipid core. We demonstrated control of the lipid particle size by the process conditions and characterized the obtained particles by transmission electron microscopy and microbeam small-angle X-ray scattering analysis. In addition, we prepared various types of core-shell and core-core-shell particles incorporating hydrophobic/hydrophilic compounds, showing the applicability of the presented process to the production of drug-encapsulating lipid particles.
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Affiliation(s)
- Masahiro Mizuno
- Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University , 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
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8
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Monteiro N, Martins A, Reis RL, Neves NM. Liposomes in tissue engineering and regenerative medicine. J R Soc Interface 2014; 11:20140459. [PMID: 25401172 PMCID: PMC4223894 DOI: 10.1098/rsif.2014.0459] [Citation(s) in RCA: 211] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Accepted: 10/02/2014] [Indexed: 01/13/2023] Open
Abstract
Liposomes are vesicular structures made of lipids that are formed in aqueous solutions. Structurally, they resemble the lipid membrane of living cells. Therefore, they have been widely investigated, since the 1960s, as models to study the cell membrane, and as carriers for protection and/or delivery of bioactive agents. They have been used in different areas of research including vaccines, imaging, applications in cosmetics and tissue engineering. Tissue engineering is defined as a strategy for promoting the regeneration of tissues for the human body. This strategy may involve the coordinated application of defined cell types with structured biomaterial scaffolds to produce living structures. To create a new tissue, based on this strategy, a controlled stimulation of cultured cells is needed, through a systematic combination of bioactive agents and mechanical signals. In this review, we highlight the potential role of liposomes as a platform for the sustained and local delivery of bioactive agents for tissue engineering and regenerative medicine approaches.
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Affiliation(s)
- Nelson Monteiro
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics Department of Polymer Engineering, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Zona Industrial da Gandra S. Cláudio do Barco, 4806-909, Caldas das Taipas, Guimarães, Portugal
- ICVS/3B's, PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Albino Martins
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics Department of Polymer Engineering, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Zona Industrial da Gandra S. Cláudio do Barco, 4806-909, Caldas das Taipas, Guimarães, Portugal
- ICVS/3B's, PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Rui L. Reis
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics Department of Polymer Engineering, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Zona Industrial da Gandra S. Cláudio do Barco, 4806-909, Caldas das Taipas, Guimarães, Portugal
- ICVS/3B's, PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Nuno M. Neves
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics Department of Polymer Engineering, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Zona Industrial da Gandra S. Cláudio do Barco, 4806-909, Caldas das Taipas, Guimarães, Portugal
- ICVS/3B's, PT Government Associate Laboratory, Braga/Guimarães, Portugal
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9
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Han SB, Kwon SS, Jeong YM, Kong BJ, Yu ER, Park SN. Physical Characterizations and In Vitro Skin Permeation of Elastic Liposomes for Transdermal Delivery of Polygonum aviculare L. Extract. POLYMER-KOREA 2014. [DOI: 10.7317/pk.2014.38.6.694] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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10
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Superior performance of liposomes over enzymatic amplification in a high-throughput assay for myoglobin in human serum. Anal Bioanal Chem 2013; 405:4017-26. [DOI: 10.1007/s00216-013-6807-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 01/24/2013] [Accepted: 01/29/2013] [Indexed: 11/28/2022]
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11
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Zhou J, Ren K, Dai W, Zhao Y, Ryan D, Wu H. Pumping-induced perturbation of flow in microfluidic channels and its implications for on-chip cell culture. LAB ON A CHIP 2011; 11:2288-94. [PMID: 21603722 DOI: 10.1039/c0lc00466a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
We study the rate of response to changes in the rate of flow and the perturbations in flow in polydimethylsiloxane (PDMS) microfluidic chips that are subjected to several common flow-control systems. We find that the flow rate of liquid delivered from a syringe pump equipped with a glass syringe responds faster to the changes in the conditions of flow than the same liquid delivered from a plastic syringe; and the rate of flow delivered from compressed air responds faster than that from a glass syringe. We discover that the rate of flow that is driven by a syringe pump and regulated by an integrated pneumatic valve responds even faster, but this flow-control method is characterized by large perturbations. We also examine the possible effects of these large perturbations on NIH 3T3 cells in microfluidic channels and find that they could cause the detachment of NIH 3T3 cells in the microchannels.
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Affiliation(s)
- Jianhua Zhou
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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12
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Sikanen T, Wiedmer SK, Heikkilä L, Franssila S, Kostiainen R, Kotiaho T. Dynamic coating of SU-8 microfluidic chips with phospholipid disks. Electrophoresis 2010; 31:2566-74. [DOI: 10.1002/elps.201000130] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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13
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Luo X, Beskok A, Karniadakis GE. Modeling Electrokinetic Flows by the Smoothed Profile Method. JOURNAL OF COMPUTATIONAL PHYSICS 2010; 229:3828-3847. [PMID: 20352076 PMCID: PMC2843932 DOI: 10.1016/j.jcp.2010.01.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We propose an efficient modeling method for electrokinetic flows based on the Smoothed Profile Method (SPM) [1-4] and spectral element discretizations. The new method allows for arbitrary differences in the electrical conductivities between the charged surfaces and the the surrounding electrolyte solution. The electrokinetic forces are included into the flow equations so that the Poisson-Boltzmann and electric charge continuity equations are cast into forms suitable for SPM. The method is validated by benchmark problems of electroosmotic flow in straight channels and electrophoresis of charged cylinders. We also present simulation results of electrophoresis of charged microtubules, and show that the simulated electrophoretic mobility and anisotropy agree with the experimental values.
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Affiliation(s)
- Xian Luo
- Division of Applied Mathematics, Brown University, Providence, RI 02912 USA
| | - Ali Beskok
- Aerospace Engineering Department, Old Dominion University, Norfolk, VA 23529 USA
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14
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Lim JK, Zhou H, Tilton RD. Liposome rupture and contents release over coplanar microelectrode arrays. J Colloid Interface Sci 2009; 332:113-21. [DOI: 10.1016/j.jcis.2008.12.035] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2008] [Revised: 12/07/2008] [Accepted: 12/10/2008] [Indexed: 10/21/2022]
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15
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Harel E, Hilty C, Koen K, McDonnell EE, Pines A. Time-of-flight flow imaging of two-component flow inside a microfluidic chip. PHYSICAL REVIEW LETTERS 2007; 98:017601. [PMID: 17358506 DOI: 10.1103/physrevlett.98.017601] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2006] [Indexed: 05/14/2023]
Abstract
Here we report on using NMR imaging and spectroscopy in conjunction with time-of-flight tracking to noninvasively tag and monitor nuclear spins as they flow through the channels of a microfluidic chip. Any species with resolvable chemical-shift signatures can be separately monitored in a single experiment, irrespective of the optical properties of the fluids, thereby eliminating the need for foreign tracers. This is demonstrated on a chip with a mixing geometry in which two fluids converge from separate channels, and is generally applicable to any microfluidic device through which fluid flows within the nuclear spin-lattice relaxation time.
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Affiliation(s)
- Elad Harel
- Materials Sciences Division, Lawrence Berkeley National Laboratory, and Department of Chemistry, University of California, Berkeley, CA 94720, USA
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16
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Zhu C, Wu LQ, Wang X, Lee JH, English DS, Ghodssi R, Raghavan SR, Payne GF. Reversible vesicle restraint in response to spatiotemporally controlled electrical signals: a bridge between electrical and chemical signaling modes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:286-91. [PMID: 17190516 DOI: 10.1021/la061421i] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Microelectronic devices employ electrons for signaling whereas the nervous system signals using ions and chemicals. Bridging these signaling differences would benefit applications that range from biosensing to neuroprosthetics. Here, we report the use of localized electrical signals to perform an operation common to chemical signaling in the nervous system. Specifically, we employ electrical signals to restrain vesicles reversibly. We perform this operation using the stimuli-responsive aminopolysaccharide chitosan that is able to electrodeposit onto cathode surfaces in response to localized electrical stimuli. We show that surfactant-vesicles and liposomes can be co-deposited with chitosan and are entrapped (i.e., restrained) within the deposited film's matrix. Vesicle co-deposition could be controlled spatially and temporally using microfabricated wafers with independent electrode addresses. Finally, we show that vesicles restrained within the deposited chitosan matrix can be mobilized under mildly acidic conditions (pH <6.5) that resolubilize chitosan. Potentially, the ability to restrain and mobilize chemical signals that are segregated within vesicles may allow microfluidic systems to access the rich diversity offered by chemical signaling.
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Affiliation(s)
- Chao Zhu
- Center for Biosystems Research, University of Maryland Biotechnology Institute, College Park, Maryland 20742, USA
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17
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Jeong JH, Sugii Y, Minamiyama M, Takeuchi H, Okamoto K. Interaction between liposomes and RBC in microvessels in vivo. Microvasc Res 2007; 73:39-47. [PMID: 16844147 DOI: 10.1016/j.mvr.2006.05.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2006] [Revised: 04/24/2006] [Accepted: 05/01/2006] [Indexed: 10/24/2022]
Abstract
Liposomes are phospholipid vesicles that can serve as carriers of biologically active agents in vitro and in vivo. Here, we describe the movement of liposomes suspended with blood flowing in capillaries. Liposomes were coated with a polymer to extend their lifespan in rat mesenteric blood vessels and detected by fluorescent staining. Liposome activity was observed by intravital microscopy using a high-speed camera system at 5 and 60 min after liposome administration. Liposome velocity was determined using two-dimensional cross-correlation, and blood flow was measured by high-resolution PIV (particle image velocimetry). The results showed that the motion of polymer-coated liposome followed the phase averaged velocity distribution of heartbeats while flowing with red blood cells in microvessels. Liposome particles tend to move toward the near blood vessel wall in the low velocity of blood flow.
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Affiliation(s)
- Jae Hong Jeong
- Department of Quantum Engineering and Systems Science, University of Tokyo, Tokyo, Japan.
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18
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Sun Y, Lu M, Yin XF, Gong XG. Intracellular labeling method for chip-based capillary electrophoresis fluorimetric single cell analysis using liposomes. J Chromatogr A 2006; 1135:109-14. [PMID: 17005186 DOI: 10.1016/j.chroma.2006.09.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2006] [Revised: 09/04/2006] [Accepted: 09/06/2006] [Indexed: 10/24/2022]
Abstract
An intracellular derivatization method mediated by liposome was developed for single cell analysis with chip-based capillary electrophoresis (CE) and laser-induced fluorescence (LIF) detection. Liposomes with an average diameter of 100 nm were produced from phosphatidylcholine to encapsulate fluorescent dyes by an ultrasonic method. The encapsulation yield and the vesicle density were determined to be 46+/-5% and 8.8 x 10(14)/mL, respectively. The amount of fluorescent dye that entered the cells was dependent on the duration of incubating cells with liposomes, liposome density, and concentration of the dye solution encapsulated in liposomes. The described method introduced cell membrane nonpermeable fluorescent dyes into living cells without reducing cell viability. Single cell analysis using microfluidic chip-based CE revealed that liposome-membrane fusion occurred after entrance of liposomes into the cells, with release of encapsulated fluorescence dyes and labeling of intracellular species.
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Affiliation(s)
- Yue Sun
- Institute of Microanalytical Systems, Department of Chemistry, Zhejiang University, Hangzhou 310027, China
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19
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Hilty C, McDonnell EE, Granwehr J, Pierce KL, Han SI, Pines A. Microfluidic gas-flow profiling using remote-detection NMR. Proc Natl Acad Sci U S A 2005; 102:14960-3. [PMID: 16214884 PMCID: PMC1257736 DOI: 10.1073/pnas.0507566102] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We have used nuclear magnetic resonance (NMR) to obtain spatially and temporally resolved profiles of gas flow in microfluidic devices. Remote detection of the NMR signal both overcomes the sensitivity limitation of NMR and enables time-of-flight measurement in addition to spatially resolved imaging. Thus, detailed insight is gained into the effects of flow, diffusion, and mixing in specific geometries. The ability for noninvasive measurement of microfluidic flow, without the introduction of foreign tracer particles, is unique to this approach and is important for the design and operation of microfluidic devices. Although here we demonstrate an application to gas flow, extension to liquids, which have higher density, is implicit.
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Affiliation(s)
- Christian Hilty
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
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20
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Gómez-Hens A, Manuel Fernández-Romero J. The role of liposomes in analytical processes. Trends Analyt Chem 2005. [DOI: 10.1016/j.trac.2004.07.017] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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21
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Cummings EB, Singh AK. Dielectrophoresis in microchips containing arrays of insulating posts: theoretical and experimental results. Anal Chem 2004; 75:4724-31. [PMID: 14674447 DOI: 10.1021/ac0340612] [Citation(s) in RCA: 301] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Dielectrophoresis (DEP), a nonlinear electrokinetic transport mechanism, can be used to concentrate and sort cells, viruses, and particles. To date, microfabricated DEP-based devices have typically used embedded metal electrodes to apply spatially nonuniform, time-varying (AC) electric fields. We have developed an alternative method in which arrays of insulating posts in a channel of a microchip produce the spatially nonuniform fields needed for DEP. Electrodes may be located remotely, allowing operation of the device down to zero frequency (DC) without excessive problems of electrolysis. Applying a sufficiently large electric field across an insulating-post array produces two flow regimes through a competition between electrokinetic flow (combined electrophoresis and electroosmosis) and dielectrophoresis. "Streaming DEP" is observed when DEP dominates diffusion but is overcome by electrokinetic flow. Particles concentrated by DEP forces in areas of electric field extrema travel electrokinetically down the array in flowing streams. In an array of posts, dielectrophoretic forcing within repeated rows adds coherently to produce flowing streams of highly concentrated and rarefied particles. We demonstrate that this reinforcement is a strong function of alignment of the array with respect to the applied electric field and that the particle concentrations can be "enhanced" or "depleted" along columns of posts, enabling a novel class of continuous-flow, selective particle filter/concentrator devices. To our knowledge, this is the first observation of streaming dielectrophoresis. The second regime is "trapping DEP," in which DEP forces dominate over both diffusion and electrokinetic flow, reversibly immobilizing particles on the insulating posts, enabling inexpensive and embedded batch filter/concentrator devices. Devices can be biased electrically to manipulate particles selectively by varying the field strength to vary the relative magnitudes of electrokinetic flow and DEP. Post shapes are contoured easily to control electric field gradients and, hence, DEP behavior. Simple simulations based on similitude of fluid flow and electric field that solve the Laplace equation to obtain fluid velocity have also been developed to predict the dielectrophoretic behavior in an array of posts. These simulations are in excellent agreement with the experimental observations and provide insight into electrokinetic behavior to enable design of dielectrophoretic concentrators and sorters.
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Affiliation(s)
- Eric B Cummings
- Chemical & Radiation Detection Laboratories, Sandia National Laboratories, Livermore, California 94551, USA.
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Devasenathipathy S, Santiago JG, Takehara K. Particle tracking techniques for electrokinetic microchannel flows. Anal Chem 2002; 74:3704-13. [PMID: 12175157 DOI: 10.1021/ac011243s] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We have applied particle tracking techniques to obtain spatially resolved velocity measurements in electrokinetic flow devices. Both micrometer-resolution particle image velocimetry (micro-PMV) and particle tracking velocimetry (PTV) techniques have been used to quantify and study flow phenomena in electrokinetic systems applicable to microfluidic bioanalytical devices. To make the flow measurements quantitative, we performed a series of seed particle calibration experiments. First, we measure the electroosmotic wall mobility of a borosilicate rectangular capillary (40 by 400 microm) using current monitoring. In addition to this wall mobility characterization, we apply PTV to determine the electrophoretic mobilities of more than 1,000 fluorescent microsphere particles in aqueous buffer solutions. Particles from this calibrated particle/ buffer mixture are then introduced into two electrokinetic flow systems for particle tracking flow experiments. In these experiments, we use micro-PIV, together with an electric field prediction, to obtain electroosmotic flow bulk fluid velocity measurements. The first example flow system is a microchannel intersection where we demonstrate a detailed documentation of the similitude between the electrical fields and the velocity fields in an electrokinetic system with uniform zeta potential, zeta. In the second system, we apply micro-PIV to a microchannel system with nonuniform zeta. The latter experiment provides a simultaneous measurement of two distinct wall mobilities within the microchannel.
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Auroux PA, Iossifidis D, Reyes DR, Manz A. Micro total analysis systems. 2. Analytical standard operations and applications. Anal Chem 2002; 74:2637-52. [PMID: 12090654 DOI: 10.1021/ac020239t] [Citation(s) in RCA: 815] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Pierre-Alain Auroux
- Department of Chemistry, Imperial College of Science, Technology and Medicine, London, UK
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