1
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Sharma V, Páscoa dos Santos F, Verschure PFMJ. Patient-specific modeling for guided rehabilitation of stroke patients: the BrainX3 use-case. Front Neurol 2023; 14:1279875. [PMID: 38099071 PMCID: PMC10719856 DOI: 10.3389/fneur.2023.1279875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Accepted: 11/06/2023] [Indexed: 12/17/2023] Open
Abstract
BrainX3 is an interactive neuroinformatics platform that has been thoughtfully designed to support neuroscientists and clinicians with the visualization, analysis, and simulation of human neuroimaging, electrophysiological data, and brain models. The platform is intended to facilitate research and clinical use cases, with a focus on personalized medicine diagnostics, prognostics, and intervention decisions. BrainX3 is designed to provide an intuitive user experience and is equipped to handle different data types and 3D visualizations. To enhance patient-based analysis, and in keeping with the principles of personalized medicine, we propose a framework that can assist clinicians in identifying lesions and making patient-specific intervention decisions. To this end, we are developing an AI-based model for lesion identification, along with a mapping of tract information. By leveraging the patient's lesion information, we can gain valuable insights into the structural damage caused by the lesion. Furthermore, constraining whole-brain models with patient-specific disconnection masks can allow for the detection of mesoscale excitatory-inhibitory imbalances that cause disruptions in macroscale network properties. Finally, such information has the potential to guide neuromodulation approaches, assisting in the choice of candidate targets for stimulation techniques such as Transcranial Ultrasound Stimulation (TUS), which modulate E-I balance, potentiating cortical reorganization and the restoration of the dynamics and functionality disrupted due to the lesion.
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Affiliation(s)
- Vivek Sharma
- Donders Institute for Brain, Cognition and Behavior, Radboud University, Nijmegen, Netherlands
| | - Francisco Páscoa dos Santos
- Eodyne Systems S.L., Barcelona, Spain
- Department of Information and Communication Technologies, Universitat Pompeu Fabra (UPF), Barcelona, Spain
| | - Paul F. M. J. Verschure
- Donders Institute for Brain, Cognition and Behavior, Radboud University, Nijmegen, Netherlands
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2
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Guo J, Lo WLA, Hu H, Yan L, Li L. Transcranial ultrasound stimulation applied in ischemic stroke rehabilitation: A review. Front Neurosci 2022; 16:964060. [PMID: 35937889 PMCID: PMC9355469 DOI: 10.3389/fnins.2022.964060] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 07/04/2022] [Indexed: 11/29/2022] Open
Abstract
Ischemic stroke is a serious medical condition that is caused by cerebral vascular occlusion and leads to neurological dysfunction. After stroke, patients suffer from long-term sensory, motor and cognitive impairment. Non-invasive neuromodulation technology has been widely studied in the field of stroke rehabilitation. Transcranial ultrasound stimulation (TUS), as a safe and non-invasive technique with deep penetration ability and a tiny focus, is an emerging technology. It can produce mechanical and thermal effects by delivering sound waves to brain tissue that can induce the production of neurotrophic factors (NFs) in the brain, and reduce cell apoptosis and the inflammatory response. TUS, which involves application of an acoustic wave, can also dissolve blood clots and be used to deliver therapeutic drugs to the ischemic region. TUS has great potential in the treatment of ischemic stroke. Future advancements in imaging and parameter optimization will improve the safety and efficacy of this technology in the treatment of ischemic stroke.
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Affiliation(s)
- Jiecheng Guo
- Institute of Medical Research, Northwestern Polytechnical University, Xi’an, China
| | - Wai Leung Ambrose Lo
- Department of Rehabilitation Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Huijing Hu
- Institute of Medical Research, Northwestern Polytechnical University, Xi’an, China
| | - Li Yan
- Institute of Medical Research, Northwestern Polytechnical University, Xi’an, China
- *Correspondence: Li Yan,
| | - Le Li
- Institute of Medical Research, Northwestern Polytechnical University, Xi’an, China
- Le Li,
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3
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Jerusalem A, Al-Rekabi Z, Chen H, Ercole A, Malboubi M, Tamayo-Elizalde M, Verhagen L, Contera S. Electrophysiological-mechanical coupling in the neuronal membrane and its role in ultrasound neuromodulation and general anaesthesia. Acta Biomater 2019; 97:116-140. [PMID: 31357005 DOI: 10.1016/j.actbio.2019.07.041] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 07/20/2019] [Accepted: 07/23/2019] [Indexed: 01/23/2023]
Abstract
The current understanding of the role of the cell membrane is in a state of flux. Recent experiments show that conventional models, considering only electrophysiological properties of a passive membrane, are incomplete. The neuronal membrane is an active structure with mechanical properties that modulate electrophysiology. Protein transport, lipid bilayer phase, membrane pressure and stiffness can all influence membrane capacitance and action potential propagation. A mounting body of evidence indicates that neuronal mechanics and electrophysiology are coupled, and together shape the membrane potential in tight coordination with other physical properties. In this review, we summarise recent updates concerning electrophysiological-mechanical coupling in neuronal function. In particular, we aim at making the link with two relevant yet often disconnected fields with strong clinical potential: the use of mechanical vibrations-ultrasound-to alter the electrophysiogical state of neurons, e.g., in neuromodulation, and the theories attempting to explain the action of general anaesthetics. STATEMENT OF SIGNIFICANCE: General anaesthetics revolutionised medical practice; now an apparently unrelated technique, ultrasound neuromodulation-aimed at controlling neuronal activity by means of ultrasound-is poised to achieve a similar level of impact. While both technologies are known to alter the electrophysiology of neurons, the way they achieve it is still largely unknown. In this review, we argue that in order to explain their mechanisms/effects, the neuronal membrane must be considered as a coupled mechano-electrophysiological system that consists of multiple physical processes occurring concurrently and collaboratively, as opposed to sequentially and independently. In this framework the behaviour of the cell membrane is not the result of stereotypical mechanisms in isolation but instead emerges from the integrative behaviour of a complexly coupled multiphysics system.
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Affiliation(s)
- Antoine Jerusalem
- Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK.
| | - Zeinab Al-Rekabi
- Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, UK
| | - Haoyu Chen
- Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
| | - Ari Ercole
- Division of Anaesthesia, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0QQ, UK
| | - Majid Malboubi
- Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
| | - Miren Tamayo-Elizalde
- Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
| | - Lennart Verhagen
- Wellcome Centre for Integrative Neuroimaging (WIN), Department of Experimental Psychology, University of Oxford, Oxford OX1 3TA, UK; WIN, Centre for Functional MRI of the Brain, Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, University of Oxford, Oxford OX3 9DU, UK
| | - Sonia Contera
- Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, UK.
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4
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Awad NS, Paul V, Mahmoud MS, Al Sawaftah NM, Kawak PS, Al Sayah MH, Husseini GA. Effect of Pegylation and Targeting Moieties on the Ultrasound-Mediated Drug Release from Liposomes. ACS Biomater Sci Eng 2019; 6:48-57. [PMID: 33463192 DOI: 10.1021/acsbiomaterials.8b01301] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The use of targeted liposomes encapsulating chemotherapy drugs enhances the specific targeting of cancer cells, thus reducing the side effects of these drugs and providing patient-friendly chemotherapy treatment. Targeted pegylated (stealth) liposomes have the ability to safely deliver their loaded drugs to the cancer cells by targeting specific receptors overly expressed on the surface of these cells. Applying ultrasound as an external stimulus will safely trigger drug release from these liposomes in a controlled manner. In this study, we investigated the release kinetics of the model drug "calcein" from targeted liposomes sonicated with low-frequency ultrasound (20 kHz). Our results showed that pegylated liposomes were more sonosensitive compared to nonpegylated liposomes. A comparison of the effect of three targeting moieties conjugated to the surface of pegylated liposomes, namely human serum albumin (HSA), transferrin (Tf) and arginylglycylaspartic acid (RGD), on calcein release kinetics was conducted. The fluorescent results showed that HSA-PEG and Tf-PEG liposomes were more sonosensitive (showing higher calcein release following the exposure to pulsed LFUS) compared to the control pegylated liposomes, thus adding more acoustic benefits to their targeting efficacy.
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5
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Blackmore J, Shrivastava S, Sallet J, Butler CR, Cleveland RO. Ultrasound Neuromodulation: A Review of Results, Mechanisms and Safety. ULTRASOUND IN MEDICINE & BIOLOGY 2019; 45:1509-1536. [PMID: 31109842 PMCID: PMC6996285 DOI: 10.1016/j.ultrasmedbio.2018.12.015] [Citation(s) in RCA: 214] [Impact Index Per Article: 42.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Revised: 12/13/2018] [Accepted: 12/29/2018] [Indexed: 05/03/2023]
Abstract
Ultrasonic neuromodulation is a rapidly growing field, in which low-intensity ultrasound (US) is delivered to nervous system tissue, resulting in transient modulation of neural activity. This review summarizes the findings in the central and peripheral nervous systems from mechanistic studies in cell culture to cognitive behavioral studies in humans. The mechanisms by which US mechanically interacts with neurons and could affect firing are presented. An in-depth safety assessment of current studies shows that parameters for the human studies fall within the safety envelope for US imaging. Challenges associated with accurately targeting US and monitoring the response are described. In conclusion, the literature supports the use of US as a safe, non-invasive brain stimulation modality with improved spatial localization and depth targeting compared with alternative methods. US neurostimulation has the potential to be used both as a scientific instrument to investigate brain function and as a therapeutic modality to modulate brain activity.
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Affiliation(s)
- Joseph Blackmore
- Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Roosevelt Drive, Oxford, UK
| | - Shamit Shrivastava
- Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Roosevelt Drive, Oxford, UK
| | - Jerome Sallet
- Wellcome Centre for Integrative Nueroimaging, Department of Experimental Psychology, University of Oxford, Oxford, UK
| | - Chris R Butler
- Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, Oxford, UK
| | - Robin O Cleveland
- Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Roosevelt Drive, Oxford, UK.
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6
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van Ballegooie C, Man A, Win M, Yapp DT. Spatially Specific Liposomal Cancer Therapy Triggered by Clinical External Sources of Energy. Pharmaceutics 2019; 11:E125. [PMID: 30884786 PMCID: PMC6470770 DOI: 10.3390/pharmaceutics11030125] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 03/12/2019] [Accepted: 03/13/2019] [Indexed: 11/25/2022] Open
Abstract
This review explores the use of energy sources, including ultrasound, magnetic fields, and external beam radiation, to trigger the delivery of drugs from liposomes in a tumor in a spatially-specific manner. Each section explores the mechanism(s) of drug release that can be achieved using liposomes in conjunction with the external trigger. Subsequently, the treatment's formulation factors are discussed, highlighting the parameters of both the therapy and the medical device. Additionally, the pre-clinical and clinical trials of each triggered release method are explored. Lastly, the advantages and disadvantages, as well as the feasibility and future outlook of each triggered release method, are discussed.
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Affiliation(s)
- Courtney van Ballegooie
- Experimental Therapeutics, BC Cancer, Vancouver, BC V5Z 1L3, Canada.
- Faculty of Medicine, University of British Columbia, Vancouver, BC V6T 1Z3, Canada.
| | - Alice Man
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, BC V6T 1Z3, Canada.
| | - Mi Win
- Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada.
| | - Donald T Yapp
- Experimental Therapeutics, BC Cancer, Vancouver, BC V5Z 1L3, Canada.
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, BC V6T 1Z3, Canada.
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7
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Awad NS, Paul V, Al-Sayah MH, Husseini GA. Ultrasonically controlled albumin-conjugated liposomes for breast cancer therapy. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2019; 47:705-714. [DOI: 10.1080/21691401.2019.1573175] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Nahid S. Awad
- Department of Chemical Engineering, American University of Sharjah, Sharjah, UAE
| | - Vinod Paul
- Department of Chemical Engineering, American University of Sharjah, Sharjah, UAE
| | - Mohammad H. Al-Sayah
- Department of Biology, Chemistry and Environmental Sciences, American University of Sharjah, Sharjah, UAE
- Biosciences and Bioengineering Research Institute, American University of Sharjah, Sharjah, UAE
| | - Ghaleb A. Husseini
- Department of Chemical Engineering, American University of Sharjah, Sharjah, UAE
- Biosciences and Bioengineering Research Institute, American University of Sharjah, Sharjah, UAE
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8
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Shrivastava S, Cleveland RO, Schneider MF. On measuring the acoustic state changes in lipid membranes using fluorescent probes. SOFT MATTER 2018; 14:9702-9712. [PMID: 30462137 DOI: 10.1039/c8sm01635f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Ultrasound is increasingly being used to modulate the properties of biological membranes for applications in drug delivery and neuromodulation. While various studies have investigated the mechanical aspects of the interaction such as acoustic absorption and membrane deformation, it is not clear how these effects transduce into biological functions, for example, changes in the permeability or the enzymatic activity of the membrane. A critical aspect of the activity of an enzyme is the thermal fluctuations of its solvation or hydration shell. Thermal fluctuations are also known to be directly related to membrane permeability. Here solvation shell changes of lipid membranes subject to an acoustic impulse were investigated using a fluorescence probe, Laurdan. Laurdan was embedded in multi-lamellar lipid vesicles in water, which were exposed to broadband pressure impulses of the order of 1 MPa peak amplitude and 10 µs pulse duration. An instrument was developed to monitor changes in the emission spectrum of the dye at two wavelengths with sub-microsecond temporal resolution. The experiments show that changes in the emission spectrum, and hence the fluctuations of the solvation shell, are related to the changes in the thermodynamic state of the membrane and correlated with the compression and rarefaction of the incident sound wave. The results suggest that acoustic fields affect the state of a lipid membrane and therefore can potentially modulate the kinetics of channels and enzymes embedded in the membrane.
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Affiliation(s)
- Shamit Shrivastava
- Institute for Biomedical Engineering, University of Oxford, Oxford OX3 7DQ, UK.
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9
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Prieto ML, Firouzi K, Khuri-Yakub BT, Maduke M. Activation of Piezo1 but Not Na V1.2 Channels by Ultrasound at 43 MHz. ULTRASOUND IN MEDICINE & BIOLOGY 2018; 44:1217-1232. [PMID: 29525457 PMCID: PMC5914535 DOI: 10.1016/j.ultrasmedbio.2017.12.020] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 12/19/2017] [Accepted: 12/22/2017] [Indexed: 05/19/2023]
Abstract
Ultrasound (US) can modulate the electrical activity of the excitable tissues, but the mechanisms underlying this effect are not understood at the molecular level or in terms of the physical modality through which US exerts its effects. Here, we report an experimental system that allows for stable patch-clamp recording in the presence of US at 43 MHz, a frequency known to stimulate neural activity. We describe the effects of US on two ion channels proposed to be involved in the response of excitable cells to US: the mechanosensitive Piezo1 channel and the voltage-gated sodium channel NaV1.2. Our patch-clamp recordings, together with finite-element simulations of acoustic field parameters indicate that Piezo1 channels are activated by continuous wave US at 43 MHz and 50 or 90 W/cm2 through cell membrane stress caused by acoustic streaming. NaV1.2 channels were not affected through this mechanism at these intensities, but their kinetics could be accelerated by US-induced heating.
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Affiliation(s)
- Martin Loynaz Prieto
- Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA, USA
| | - Kamyar Firouzi
- E. L. Ginzton Laboratory, Stanford University, Stanford, CA, USA
| | | | - Merritt Maduke
- Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA, USA.
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10
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Wrenn SP, Small E, Dan N. Bubble nucleation in lipid bilayers: A mechanism for low frequency ultrasound disruption. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:1192-7. [DOI: 10.1016/j.bbamem.2012.12.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 12/18/2012] [Accepted: 12/31/2012] [Indexed: 12/14/2022]
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11
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Schroeder A, Kost J, Barenholz Y. Ultrasound, liposomes, and drug delivery: principles for using ultrasound to control the release of drugs from liposomes. Chem Phys Lipids 2009; 162:1-16. [DOI: 10.1016/j.chemphyslip.2009.08.003] [Citation(s) in RCA: 332] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2009] [Revised: 08/17/2009] [Accepted: 08/18/2009] [Indexed: 02/07/2023]
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12
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Anosov AA, Barabanenkov YN, Kazanskij AS, Less YA, Sharakshane AS. Thermal acoustic radiation from multilamellar vesicles in lipid phase transition. Chem Phys Lipids 2008; 153:81-4. [DOI: 10.1016/j.chemphyslip.2008.03.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2007] [Revised: 02/27/2008] [Accepted: 03/03/2008] [Indexed: 11/15/2022]
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13
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Kuciauskas D, Wohl CJ, Pouy M, Nasai A, Gulbinas V. Nonlinear Optical Spectroscopic Studies of Energy Transfer in Phospholipid Bilayer Liposomes Embedded with Porphyrin Sensitizers. J Phys Chem B 2004. [DOI: 10.1021/jp049537f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Darius Kuciauskas
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, and Institute of Physics, Vilnius, Lithuania
| | - Christopher J. Wohl
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, and Institute of Physics, Vilnius, Lithuania
| | - Mark Pouy
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, and Institute of Physics, Vilnius, Lithuania
| | - Aquelah Nasai
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, and Institute of Physics, Vilnius, Lithuania
| | - Vidmantas Gulbinas
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, and Institute of Physics, Vilnius, Lithuania
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14
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García MJ. Therapeutic Application of Ultrasound Contrast Agents. CONTRAST ECHOCARDIOGRAPHY IN CLINICAL PRACTICE 2004:263-286. [DOI: 10.1007/978-88-470-2125-9_16] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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15
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16
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Lawrie A, Brisken AF, Francis SE, Cumberland DC, Crossman DC, Newman CM. Microbubble-enhanced ultrasound for vascular gene delivery. Gene Ther 2000; 7:2023-7. [PMID: 11175314 DOI: 10.1038/sj.gt.3301339] [Citation(s) in RCA: 224] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Progress in cardiovascular gene therapy has been hampered by concerns over the safety and practicality of viral vectors and the inefficiency of current nonviral transfection techniques. We have previously reported that ultrasound exposure (USE) enhances transgene expression in vascular cells by up to 10-fold after naked DNA transfection, and enhances lipofection by up to three-fold. We report here that performing USE in the presence of microbubble echocontrast agents enhances acoustic cavitation and is associated with approximately 300-fold increments in transgene expression after naked DNA transfections. This approach also enhances by four-fold the efficiency of polyplex transfection, yielding transgene expression levels approximately 3000-fold higher than after naked DNA alone. These data indicate an important role for acoustic cavitation in the effects of USE. Ultrasound can be focused upon almost any organ and hence this approach holds promise as a means to deliver targeted gene therapy in cardiovascular conditions such as such angioplasty restenosis and in many other clinical situations.
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Affiliation(s)
- A Lawrie
- Cardiovascular Research Group, Division of Clinical Sciences, University of Sheffield, Sheffield, UK
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17
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Morse R, Ma LD, Magin RL, Dunn F. Ultrasound interaction with large unilamellar vesicles at the phospholipid phase transition: perturbation by phospholipid side chain substitution with deuterium. Chem Phys Lipids 1999; 103:1-10. [PMID: 10701075 DOI: 10.1016/s0009-3084(99)00068-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The ultrasonic absorption, alpha lambda, as a function of temperature and frequency was determined in large unilamellar vesicles (LUVs) in which specific phospholipid side chains were deuterated. Deuteration significantly altered the temperature and frequency dependence of alpha lambda. The frequency change was especially marked, with decreased frequency and broadening of the ultrasound relaxation, even with only minor changes in the phase transition temperature. Deuteration decreased the Tm and enthalpy of the lipid phase transition, as shown by differential scanning calorimetry, whereas electron spin resonance showed that at and above the lipid phase transition, no differences in the mobility as a function of temperature were observed. These results show that the observed increase in ultrasonic absorption in LUVs at the phospholipid phase transition arises from the interaction of ultrasound with the hydrophobic side chains, probably coupling with structural reorganization of small domains of molecules, a process which is maximized at the phase transition temperature.
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Affiliation(s)
- R Morse
- Department of Chemistry, Illinois State University, Normal 61790-4160, USA
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18
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Hianik T, Babincová M, Babinec P, Prenner E, Paltauf F, Hermetter A. Aggregation of Small Unilamellar Vesicles of Polyunsaturated Phosphatidylcholines under the Influence of Polyethylene Glycol. ACTA ACUST UNITED AC 1999. [DOI: 10.1524/zpch.1999.211.part_2.133] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- T. Hianik
- Department of Biophysics and Chemical Physics, Faculty of Mathematics and Physics, Comenius University, Bratislava, Slovakia
| | - M. Babincová
- Department of Biophysics and Chemical Physics, Faculty of Mathematics and Physics, Comenius University, Bratislava, Slovakia
| | - P. Babinec
- Department of Biophysics and Chemical Physics, Faculty of Mathematics and Physics, Comenius University, Bratislava, Slovakia
| | - E. Prenner
- Institut of Biochemistry and Food Chemistry, Technical University of Graz, Graz, Austria
| | - F. Paltauf
- Institut of Biochemistry and Food Chemistry, Technical University of Graz, Graz, Austria
| | - A. Hermetter
- Institut of Biochemistry and Food Chemistry, Technical University of Graz, Graz, Austria
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19
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Lawrie A, Brisken AF, Francis SE, Tayler DI, Chamberlain J, Crossman DC, Cumberland DC, Newman CM. Ultrasound enhances reporter gene expression after transfection of vascular cells in vitro. Circulation 1999; 99:2617-20. [PMID: 10338452 DOI: 10.1161/01.cir.99.20.2617] [Citation(s) in RCA: 144] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
BACKGROUND Restenosis after percutaneous coronary intervention remains a serious clinical problem. Progress in local gene therapy to prevent restenosis has been hindered by concerns over the safety and efficacy of viral vectors and the limited efficiency of nonviral techniques. This study investigates the use of adjunctive ultrasound to enhance nonviral gene delivery. METHODS AND RESULTS Cultured porcine vascular smooth muscle cells (VSMCs) and endothelial cells (ECs) were transfected with naked or liposome-complexed luciferase reporter plasmid for 3 hours. Ultrasound exposure (USE) for 60 seconds at 1 MHz, 0.4 W/cm2, 30 minutes into this transfection period enhanced luciferase activity 48 hours later by 7.5-fold and 2. 4-fold, respectively. Luciferase activity after lipofection of ECs was similarly enhanced 3.3-fold by adjunctive USE. USE had no effect on cell viability, although it inhibited VSMC but not EC proliferation. CONCLUSIONS Adjunctive USE was associated with enhanced transgene expression in VSMCs and ECs and reduced VSMC but not EC proliferation in vitro, which suggests that ultrasound-assisted local gene therapy has potential as an antirestenotic therapy.
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Affiliation(s)
- A Lawrie
- Cardiovascular Medicine, Division of Clinical Sciences, University of Sheffield, Sheffield, UK
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20
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Koynova R, Caffrey M. Phases and phase transitions of the phosphatidylcholines. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1376:91-145. [PMID: 9666088 DOI: 10.1016/s0304-4157(98)00006-9] [Citation(s) in RCA: 786] [Impact Index Per Article: 30.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
LIPIDAT (http://www.lipidat.chemistry.ohio-state.edu) is an Internet accessible, computerized relational database providing access to the wealth of information scattered throughout the literature concerning synthetic and biologically derived polar lipid polymorphic and mesomorphic phase behavior and molecular structures. Here, a review of the data subset referring to phosphatidylcholines is presented together with an analysis of these data. This subset represents ca. 60% of all LIPIDAT records. It includes data collected over a 43-year period and consists of 12,208 records obtained from 1573 articles in 106 different journals. An analysis of the data in the subset identifies trends in phosphatidylcholine phase behavior reflecting changes in lipid chain length, unsaturation (number, isomeric type and position of double bonds), asymmetry and branching, type of chain-glycerol linkage (ester, ether, amide), position of chain attachment to the glycerol backbone (1,2- vs. 1,3-) and head group modification. Also included is a summary of the data concerning the effect of pressure, pH, stereochemical purity, and different additives such as salts, saccharides, amino acids and alcohols, on phosphatidylcholine phase behavior. Information on the phase behavior of biologically derived phosphatidylcholines is also presented. This review includes 651 references.
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Affiliation(s)
- R Koynova
- Institute of Biophysics, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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21
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Hianik T, Rybár P, Kostner GM, Hermetter A. Molecular acoustic as a new tool for the study of biophysical properties of lipoproteins. Biophys Chem 1997; 67:221-8. [PMID: 9397526 DOI: 10.1016/s0301-4622(97)00041-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The method of measurement of velocity and absorption of ultrasound at a fixed frequency (7.2 MHz) and measurement of density were used to study the physical properties of high- (HDL3) and low- (LDL) density lipoproteins. We found substantial changes in velocity number [u] and absorption number [alpha lambda] on temperature, which reflect structural changes in the hydrophobic core of LDL at the thermotropic-phase transition. The absorption number revealed broad changes in temperature for both classes of lipoproteins (LP). The density of LP also depends on temperature but in considerably less degree than the acoustic parameters. The values of acoustic parameters were determined, showing that LDL and HDL3 greatly differ with respect to adiabatic compressibility.
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Affiliation(s)
- T Hianik
- Department of Biophysics and Chemical Physics, Faculty of Mathematics and Physics, Comenius University, Bratislava, Slovak Republic.
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Hianik T, Kaatze U, Sargent DF, Krivánek R, Halstenberg S, Pieper W, Gaburjaková J, Gaburjaková M, Pooga M, Langel U. A study of the interaction of some neuropeptides and their analogs with bilayer lipid membranes and liposomes. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s0302-4598(96)05148-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Chalikian TV, Sarvazyan AP, Breslauer KJ. Hydration and partial compressibility of biological compounds. Biophys Chem 1994; 51:89-107; discussion 107-9. [PMID: 7919045 DOI: 10.1016/0301-4622(94)85007-0] [Citation(s) in RCA: 221] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We review the results of compressibility studies on proteins, nucleic acids, and systematically altered low molecular weight compounds that model the constituents of these biopolymers. The model compound data allow one to define the compressibility properties of water surrounding charged, polar, and nonpolar groups. These results, in conjunction with compressibility data on proteins and nucleic acids, were used to define the properties of water that is perturbed by the presence of these biopolymers in aqueous solutions. Throughout this review, we emphasize the importance of compressibility data for characterizing the hydration properties of solutes (particularly, proteins, nucleic acids, and their constituents), while describing how such data can be interpreted to gain insight into role that hydration can play in modulating the stability of and recognition between biologically important compounds.
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Affiliation(s)
- T V Chalikian
- Department of Chemistry, Rutgers, State University of New Jersey, Piscataway 08855
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Tata DB, Hahn G, Dunn F. Ultrasonic absorption frequency dependence of two widely used anti-cancer drugs: doxorubicin and daunorubicin. ULTRASONICS 1993; 31:447-450. [PMID: 8236585 DOI: 10.1016/0041-624x(93)90054-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Low intensity ultrasound (approximately 10(-6) W cm-2) in the frequency range 0.5-6.0 MHz was employed to investigate the ultrasound absorption properties of doxorubicin (DOX) at several temperatures. At physiological temperatures, we found enhanced ultrasound absorption from DOX, and its closely related analogue daunorubicin (DNR), in the upper kilohertz frequency range. The findings do not conform to classical theory of ultrasound absorption, thus suggesting an ultrasound coupling with the drug molecules via structural and/or chemical relaxation processes. The absorption spectra are analysed from the point of view of the non-classical theory of sound absorption due to physical and/or chemical relaxations. Only one spectral difference between the two anti-cancer agents is observed, around 2 MHz, and may be attributed to the sole difference in the chemical make-up of the side chain of the two antibiotics.
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Affiliation(s)
- D B Tata
- Department of Radiation Oncology, Stanford School of Medicine, Stanford University, California 94305
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