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Müller WA, Sarkis JR, Marczak LDF, Muniz AR. Computational analysis of the simultaneous application of ultrasound and electric fields in a lipid bilayer. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2024; 1866:184364. [PMID: 38901662 DOI: 10.1016/j.bbamem.2024.184364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Revised: 06/07/2024] [Accepted: 06/13/2024] [Indexed: 06/22/2024]
Abstract
The combined application of electric fields and ultrasonic waves has shown promise in controlling cell membrane permeability, potentially resulting in synergistic effects that can be explored in the biotechnology industry. However, further clarification on how these processes interact is still needed. The objective of the present study was to investigate the atomic-scale effects of these processes on a DPPC lipid bilayer using molecular dynamics simulations. For higher electric fields, capable of independently forming pores, the application of an ultrasonic wave in the absence of cavitation yielded no additional effects on pore formation. However, for lower electric fields, the reduction in bilayer thickness induced by the shock wave catalyzed the electroporation process, effectively shortening the mean path that water molecules must traverse to form pores. When cavitation was considered, synergistic effects were evident only if the wave alone was able to generate pores through the formation of a water nanojet. In these cases, sonoporation acted as a mean to focus the electroporation effects on the initial pore formed by the nanojet. This study contributes to a better understanding of the synergy between electric fields and ultrasonic waves and to an optimal selection of processing parameters in practical applications of these processes.
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Affiliation(s)
- Wagner Augusto Müller
- Universidade Federal do Rio Grande do Sul (UFRGS), Department of Chemical Engineering, Porto Alegre, RS, Brazil
| | - Júlia Ribeiro Sarkis
- Universidade Federal do Rio Grande do Sul (UFRGS), Department of Chemical Engineering, Porto Alegre, RS, Brazil
| | | | - André Rodrigues Muniz
- Universidade Federal do Rio Grande do Sul (UFRGS), Department of Chemical Engineering, Porto Alegre, RS, Brazil.
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2
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Kato S, Yoshiba S, Mori S, Kodama T. Optimization of the delivery of molecules into lymph nodes using a lymphatic drug delivery system with ultrasound. Int J Pharm 2021; 597:120324. [PMID: 33540016 DOI: 10.1016/j.ijpharm.2021.120324] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 12/28/2020] [Accepted: 01/22/2021] [Indexed: 02/01/2023]
Abstract
Conventional treatment for lymph node (LN) metastasis such as systemic chemotherapy have notable disadvantages that lead to the development of unwanted effects. Previously, we have reported the lymphatic administration of drugs into metastatic LNs using a lymphatic drug delivery system (LDDS). However, prior studies of the LDDS have not attempted to optimize the conditions for efficient drug delivery. Here, we investigated the influence of several factors on the efficiency of drug delivery by a LDDS in conjunction with ultrasound (US). First, the effect of the injection rate on delivery efficiency was evaluated. Fluorescent molecules injected into an upstream LN were delivered more effectively into a downstream LN when a lower injection rate was used. Second, the influence of molecular weight on drug delivery efficiency was determined. We found that molecules with a molecular weight >10,000 were poorly delivered into the LN. Finally, we assessed whether the administration route affected the delivery efficiency. We found that the delivery efficiency was higher when molecules were administered into an upstream LN that was close to the target LN. These findings revealed the importance of a drug's physical properties if it is to be administered by LDDS to treat LN metastasis.
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Affiliation(s)
- Shigeki Kato
- Laboratory of Biomedical Engineering for Cancer, Department of Biomedical Engineering, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; Biomedical Engineering Cancer Research Center, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; Department of Immunology, Kindai University Faculty of Medicine, Osaka-Sayama, Osaka 589-8511, Japan
| | - Shota Yoshiba
- Laboratory of Biomedical Engineering for Cancer, Department of Biomedical Engineering, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; Biomedical Engineering Cancer Research Center, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan
| | - Shiro Mori
- Laboratory of Biomedical Engineering for Cancer, Department of Biomedical Engineering, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; Biomedical Engineering Cancer Research Center, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; Department of Oral and Maxillofacial Surgery, Tohoku University Hospital, 1-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan
| | - Tetsuya Kodama
- Laboratory of Biomedical Engineering for Cancer, Department of Biomedical Engineering, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; Biomedical Engineering Cancer Research Center, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; Department of Electronic Engineering, Graduate School of Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8579, Japan.
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3
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Escauriza EM, Duarte JP, Chapman DJ, Rutherford ME, Farbaniec L, Jonsson JC, Smith LC, Olbinado MP, Skidmore J, Foster P, Ringrose T, Rack A, Eakins DE. Collapse dynamics of spherical cavities in a solid under shock loading. Sci Rep 2020; 10:8455. [PMID: 32439927 PMCID: PMC7242352 DOI: 10.1038/s41598-020-64669-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Accepted: 04/09/2020] [Indexed: 01/31/2023] Open
Abstract
Extraordinary states of highly localised pressure and temperature can be generated upon the collapse of impulsively driven cavities. Direct observation of this phenomenon in solids has proved challenging, but recent advances in high-speed synchrotron radiography now permit the study of highly transient, subsurface events in real time. We present a study on the shock-induced collapse of spherical cavities in a solid polymethyl methacrylate medium, driven to shock states between 0.49 and 16.60 GPa. Utilising multi-MHz phase contrast radiography, extended sequences of the collapse process have been captured, revealing new details of interface motion, material failure and jet instability formation. Results reveal a rich array of collapse characteristics dominated by strength effects at low shock pressures and leading to a hydrodynamic response at the highest loading conditions.
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Affiliation(s)
- E M Escauriza
- Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, UK.
- ESRF - The European Synchrotron, CS40220, F-38043, Grenoble, France.
- Department of Physics, Imperial College London, London, SW7 2BZ, UK.
| | - J P Duarte
- Department of Physics, Imperial College London, London, SW7 2BZ, UK
| | - D J Chapman
- Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, UK
- Department of Physics, Imperial College London, London, SW7 2BZ, UK
| | - M E Rutherford
- Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, UK
- Department of Physics, Imperial College London, London, SW7 2BZ, UK
| | - L Farbaniec
- Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, UK
- Department of Physics, Imperial College London, London, SW7 2BZ, UK
| | - J C Jonsson
- Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, UK
- Department of Physics, Imperial College London, London, SW7 2BZ, UK
| | - L C Smith
- Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, UK
- Department of Physics, Imperial College London, London, SW7 2BZ, UK
| | - M P Olbinado
- ESRF - The European Synchrotron, CS40220, F-38043, Grenoble, France
| | - J Skidmore
- First Light Fusion Ltd., Yarnton, Kidlington, OX5 1QU, UK
| | - P Foster
- First Light Fusion Ltd., Yarnton, Kidlington, OX5 1QU, UK
| | - T Ringrose
- First Light Fusion Ltd., Yarnton, Kidlington, OX5 1QU, UK
| | - A Rack
- ESRF - The European Synchrotron, CS40220, F-38043, Grenoble, France
| | - D E Eakins
- Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, UK
- Department of Physics, Imperial College London, London, SW7 2BZ, UK
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4
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López-Marín LM, Rivera AL, Fernández F, Loske AM. Shock waves: A non-shocking way for targeted therapies?: Reply to comments on "Shock wave-induced permeabilization of mammalian cells". Phys Life Rev 2018; 26-27:53-56. [PMID: 30097287 DOI: 10.1016/j.plrev.2018.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 08/01/2018] [Indexed: 10/28/2022]
Affiliation(s)
- Luz M López-Marín
- Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, 76230 Querétaro, Qro., Mexico
| | - Ana Leonor Rivera
- Instituto de Ciencias Nucleares & Centro de Ciencias de la Complejidad, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 Ciudad de México, Mexico
| | - Francisco Fernández
- Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, 76230 Querétaro, Qro., Mexico
| | - Achim M Loske
- Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, 76230 Querétaro, Qro., Mexico.
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5
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Datey A, Chakravortty D, Gopalan J. An overview of a novel use of shockwaves to alter cell permeability: Comment on "Shock wave-induced permeabilization of mammalian cells" by Luz M. López-Marín et al. Phys Life Rev 2018; 26-27:51-52. [PMID: 30042014 DOI: 10.1016/j.plrev.2018.06.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 06/29/2018] [Indexed: 12/27/2022]
Affiliation(s)
- Akshay Datey
- Centre for Biosystems Science & Engineering, Indian Institute of Science, India
| | - Dipshikha Chakravortty
- Centre for Biosystems Science & Engineering, Indian Institute of Science, India; Department of Microbiology & Cell Biology, Indian Institute of Science, India.
| | - Jagadeesh Gopalan
- Centre for Biosystems Science & Engineering, Indian Institute of Science, India; Department of Aerospace Engineering, Indian Institute of Science, India.
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6
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López-Marín LM, Rivera AL, Fernández F, Loske AM. Shock wave-induced permeabilization of mammalian cells. Phys Life Rev 2018; 26-27:1-38. [PMID: 29685859 DOI: 10.1016/j.plrev.2018.03.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 02/12/2018] [Accepted: 02/26/2018] [Indexed: 12/18/2022]
Abstract
Controlled permeabilization of mammalian cell membranes is fundamental to develop gene and cell therapies based on macromolecular cargo delivery, a process that emerged against an increasing number of health afflictions, including genetic disorders, cancer and infections. Viral vectors have been successfully used for macromolecular delivery; however, they may have unpredictable side effects and have been limited to life-threatening cases. Thus, several chemical and physical methods have been explored to introduce drugs, vaccines, and nucleic acids into cells. One of the most appealing physical methods to deliver genes into cells is shock wave-induced poration. High-speed microjets of fluid, emitted due to the collapse of microbubbles after shock wave passage, represent the most significant mechanism that contributes to cell membrane poration by this technique. Herein, progress in shock wave-induced permeabilization of mammalian cells is presented. After covering the main concepts related to molecular strategies whose applications depend on safer drug delivery methods, the physics behind shock wave phenomena is described. Insights into the use of shock waves for cell membrane permeation are discussed, along with an overview of the two major biomedical applications thereof-i.e., genetic modification and anti-cancer shock wave-assisted chemotherapy. The aim of this review is to summarize 30 years of data showing underwater shock waves as a safe, noninvasive method for macromolecular delivery into mammalian cells, encouraging the development of further research, which is still required before the introduction of this promising tool into clinical practice.
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Affiliation(s)
- Luz M López-Marín
- Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, 76230 Querétaro, Qro., Mexico.
| | - Ana Leonor Rivera
- Instituto de Ciencias Nucleares & Centro de Ciencias de la Complejidad, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 Ciudad de México, Mexico.
| | - Francisco Fernández
- Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, 76230 Querétaro, Qro., Mexico.
| | - Achim M Loske
- Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, 76230 Querétaro, Qro., Mexico.
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7
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8
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Abstract
This study presents a unique approach to understanding the biophysical mechanisms of ultrasound-triggered cell membrane disruption (i.e., sonoporation). We report direct correlations between ultrasound-stimulated encapsulated microbubble oscillation physics and the resulting cellular membrane permeability by simultaneous microscopy of these two processes over their intrinsic physical timescales (microseconds for microbubble dynamics and seconds to minutes for local macromolecule uptake and cell membrane reorganization). We show that there exists a microbubble oscillation-induced shear-stress threshold, on the order of kilopascals, beyond which endothelial cellular membrane permeability increases. The shear-stress threshold exhibits an inverse square-root relation to the number of oscillation cycles and an approximately linear dependence on ultrasound frequency from 0.5 to 2 MHz. Further, via real-time 3D confocal microscopy measurements, our data provide evidence that a sonoporation event directly results in the immediate generation of membrane pores through both apical and basal cell membrane layers that reseal along their lateral area (resealing time of ∼<2 min). Finally, we demonstrate the potential for sonoporation to indirectly initiate prolonged, intercellular gaps between adjacent, confluent cells (∼>30-60 min). This real-time microscopic approach has provided insight into both the physical, cavitation-based mechanisms of sonoporation and the biophysical, cell-membrane-based mechanisms by which microbubble acoustic behaviors cause acute and sustained enhancement of cellular and vascular permeability.
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9
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Ronan E, Edjiu N, Kroukamp O, Wolfaardt G, Karshafian R. USMB-induced synergistic enhancement of aminoglycoside antibiotics in biofilms. ULTRASONICS 2016; 69:182-190. [PMID: 27111871 DOI: 10.1016/j.ultras.2016.03.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 03/08/2016] [Accepted: 03/28/2016] [Indexed: 06/05/2023]
Abstract
This study evaluated the effect of combining antibiotics with ultrasound and microbubbles (USMB) toward the eradication of biofilms. Pseudomonas aeruginosa PAO1 biofilms were treated with the antibiotics gentamicin sulfate or streptomycin sulfate, or a combination of USMB with the respective antibiotics. Biofilm structure was quantified using confocal laser scanning microscopy with COMSTAT analysis, while activity was measured as whole-biofilm CO2 production in a continuous-flow biofilm model. The combined antibiotic-USMB treatment significantly impacted biofilm biomass, thickness and surface roughness compared to antibiotics alone (p<0.05). USMB exposure caused the formation of craters (5-20μm in diameter) in the biofilms, and when combined with gentamicin, activity was significantly lower, compared to gentamicin, USMB or untreated controls, respectively. Interestingly, the CO2 production rate following combined streptomycin-USMB treatment was higher than after streptomycin alone, but significantly lower than USMB alone and untreated control. These results show strong evidence of a synergistic effect between antibiotics and USMB, although the varied response to different antibiotics emphasize the need to optimize the USMB exposure conditions to maximize this synergism and ultimately transfer this technology into clinical or industrial practice.
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Affiliation(s)
- Evan Ronan
- Department of Chemistry and Biology, Ryerson University, Toronto, Ontario, Canada
| | - Narbeh Edjiu
- Department of Physics, Ryerson University, Toronto, Ontario, Canada
| | - Otini Kroukamp
- Department of Chemistry and Biology, Ryerson University, Toronto, Ontario, Canada
| | - Gideon Wolfaardt
- Department of Chemistry and Biology, Ryerson University, Toronto, Ontario, Canada
| | - Raffi Karshafian
- Department of Physics, Ryerson University, Toronto, Ontario, Canada.
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10
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Adhikari U, Goliaei A, Berkowitz ML. Mechanism of Membrane Poration by Shock Wave Induced Nanobubble Collapse: A Molecular Dynamics Study. J Phys Chem B 2015; 119:6225-34. [DOI: 10.1021/acs.jpcb.5b02218] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Upendra Adhikari
- Department
of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Ardeshir Goliaei
- Department
of Biochemistry and Biophysics and Program in Molecular and Cellular
Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Max L. Berkowitz
- Department
of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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11
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Fu H, Comer J, Cai W, Chipot C. Sonoporation at Small and Large Length Scales: Effect of Cavitation Bubble Collapse on Membranes. J Phys Chem Lett 2015; 6:413-418. [PMID: 26261957 DOI: 10.1021/jz502513w] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Ultrasound has emerged as a promising means to effect controlled delivery of therapeutic agents through cell membranes. One possible mechanism that explains the enhanced permeability of lipid bilayers is the fast contraction of cavitation bubbles produced on the membrane surface, thereby generating large impulses, which, in turn, enhance the permeability of the bilayer to small molecules. In the present contribution, we investigate the collapse of bubbles of different diameters, using atomistic and coarse-grained molecular dynamics simulations to calculate the force exerted on the membrane. The total impulse can be computed rigorously in numerical simulations, revealing a superlinear dependence of the impulse on the radius of the bubble. The collapse affects the structure of a nearby immobilized membrane, and leads to partial membrane invagination and increased water permeation. The results of the present study are envisioned to help optimize the use of ultrasound, notably for the delivery of drugs.
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Affiliation(s)
- Haohao Fu
- †Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Jeffrey Comer
- ‡Laboratoire International Associé Centre National de la Recherche Scientifique et University of Illinois at Urbana-Champaign, Unité Mixte de Recherche n°7565, Université de Lorraine, B.P. 70239, 54506 Vandœuvre-lès-Nancy cedex, France
- §Nanotechnology Innovation Center of Kansas State, Institute of Computational Comparative Medicine, Department of Anatomy and Physiology, Kansas State University, P-213 Mosier Hall, Manhattan, Kansas 66506, United States
| | - Wensheng Cai
- †Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), and Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Christophe Chipot
- ‡Laboratoire International Associé Centre National de la Recherche Scientifique et University of Illinois at Urbana-Champaign, Unité Mixte de Recherche n°7565, Université de Lorraine, B.P. 70239, 54506 Vandœuvre-lès-Nancy cedex, France
- ∥Theoretical and Computational Biophysics Group, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, 405 North Mathews, Urbana, Illinois 61801, United States
- ⊥Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801, United States
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12
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Horie S, Watanabe Y, Chen R, Mori S, Matsumura Y, Kodama T. Development of localized gene delivery using a dual-intensity ultrasound system in the bladder. ULTRASOUND IN MEDICINE & BIOLOGY 2010; 36:1867-1875. [PMID: 20870350 DOI: 10.1016/j.ultrasmedbio.2010.07.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2009] [Revised: 05/24/2010] [Accepted: 07/20/2010] [Indexed: 05/29/2023]
Abstract
A dual-intensity ultrasound system (DIUS) using nanobubbles offers opportunities for localized gene delivery. This system consists of low-/high-ultrasound intensities. The bladder is a balloon-shaped closed organ in which the behavior of nanobubbles can be controlled spatially and temporally by ultrasound exposure. We hypothesized that when a DIUS with nanobubbles was used, low-intensity ultrasound would direct nanobubbles to targeted cells in the bladder, whereas high-intensity ultrasound intensity would collapse nanobubbles and increase cell membrane permeability, facilitating entry of exogenous molecules into proximate cells. A high-frequency ultrasound imaging system characterized movement and fragmentation of nanobubbles in the bladder. Confocal microscopy revealed that fluorescent molecules were delivered in the localized bladder wall, whereas histochemical examination indicated that the molecular transfer efficiency depended on the acoustic energy. A bioluminescence imaging system showed luciferase plasmid DNA was actually transfected in the bladder wall and subsequent transfection depended on acoustic energy. These findings indicate that delivery of exogenous molecules in the bladder using this approach results in high localization of molecular delivery, facilitating gene therapy for bladder cancer.
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Affiliation(s)
- Sachiko Horie
- Graduate School of Biomedical Engineering, Tohoku University, Sendai, Miyagi, Japan
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13
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Vedadi M, Choubey A, Nomura K, Kalia RK, Nakano A, Vashishta P, van Duin ACT. Structure and dynamics of shock-induced nanobubble collapse in water. PHYSICAL REVIEW LETTERS 2010; 105:014503. [PMID: 20867452 DOI: 10.1103/physrevlett.105.014503] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2009] [Revised: 04/01/2010] [Indexed: 05/20/2023]
Abstract
Shock-induced collapse of nanobubbles in water is investigated with molecular dynamics simulations based on a reactive force field. We observe a focused jet at the onset of bubble shrinkage and a secondary shock wave upon bubble collapse. The jet length scales linearly with the nanobubble radius, as observed in experiments on micron-to-millimeter size bubbles. Shock induces dramatic structural changes, including an ice-VII-like structural motif at a particle velocity of 1 km/s. The incipient ice VII formation and the calculated Hugoniot curve are in good agreement with experimental results.
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Affiliation(s)
- M Vedadi
- Collaboratory for Advanced Computing and Simulations, University of Southern California, Los Angeles, California 90089-0242, USA
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14
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Kodama T, Aoi A, Watanabe Y, Horie S, Kodama M, Li L, Chen R, Teramoto N, Morikawa H, Mori S, Fukumoto M. Evaluation of transfection efficiency in skeletal muscle using nano/microbubbles and ultrasound. ULTRASOUND IN MEDICINE & BIOLOGY 2010; 36:1196-1205. [PMID: 20620706 DOI: 10.1016/j.ultrasmedbio.2010.04.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2009] [Revised: 04/21/2010] [Accepted: 04/28/2010] [Indexed: 05/29/2023]
Abstract
Recent studies have revealed that ultrasound contrast agents with low-intensity ultrasound, namely, sonoporation, can noninvasively deliver therapeutic molecules into target sites. However, the efficiency of molecular delivery is relatively low and the methodology requires optimization. Here, we investigated three types of nano/microbubbles (NMBs)-human albumin shell bubbles, lipid bubbles and acoustic liposomes-to evaluate the efficiency of gene expression in skeletal muscle as a function of their physicochemical properties and the number of bubbles in solution. We found that acoustic liposomes showed the highest transfection and gene expression efficiency among the three types of NMBs under ultrasound-optimized conditions. Liposome transfection efficiency increased with bubble volume concentration; however, neither bubble volume concentration nor their physicochemical properties were related to the tissue damage detected in the skeletal muscle, which was primarily caused by needle injection.
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Affiliation(s)
- Tetsuya Kodama
- Graduate School of Biomedical Engineering, Tohoku University, Aoba-ku, Sendai, Japan.
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15
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Watanabe Y, Horie S, Funaki Y, Kikuchi Y, Yamazaki H, Ishii K, Mori S, Vassaux G, Kodama T. Delivery of Na/I Symporter Gene into Skeletal Muscle Using Nanobubbles and Ultrasound: Visualization of Gene Expression by PET. J Nucl Med 2010; 51:951-8. [DOI: 10.2967/jnumed.109.074443] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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16
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Kodama T, Tomita N, Horie S, Sax N, Iwasaki H, Suzuki R, Maruyama K, Mori S, Manabu F. Morphological study of acoustic liposomes using transmission electron microscopy. JOURNAL OF ELECTRON MICROSCOPY 2009; 59:187-196. [PMID: 19906662 DOI: 10.1093/jmicro/dfp056] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Sonoporation is achieved by ultrasound-mediated destruction of ultrasound contrast agents (UCA) microbubbles. For this, UCAs must be tissue specific and have good echogenicity and also function as drug carriers. Previous studies have developed acoustic liposomes (ALs), liposomes that encapsulate phosphate buffer solution and perfluoropropane (C(3)F(8)) gas and function as both UCAs and drug carriers. Few studies have examined the co-existence of gas and liquid in ALs. This study aims to elucidate AL structure using TEM. The size, zeta potential and structure of ALs were compared with those of two other UCAs, human albumin shell bubbles (ABs; Optison) and lipid bubbles (LBs). ABs and LBs encapsulate the C(3)F(8) gas. Particle size was measured by dynamic light scattering. The zeta potential was determined by the Smoluchowski equation. UCA structure was investigated by TEM. ALs were approximately 200 nm in size, smaller than LBs and ABs. ALs and LBs had almost neutral zeta potentials whereas AB values were strongly negative. The negative or double staining TEM images revealed that approximately 20% of ALs contained both liquid and gas, while approximately 80% contained liquid alone (i.e. nonacoustic). Negative staining AB images indicated electron beam scattering near the shell surface, and albumin was detected in filament form. These findings suggest that AL is capable of carrying drugs and high-molecular-weight, low-solubility gases.
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Affiliation(s)
- Tetsuya Kodama
- Graduate School of Biomedical Engineering, Tohoku University, 2-1 Seiryo, Aoba, Sendai, 980-8575, Japan.
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