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Chabouh G, van Elburg B, Versluis M, Segers T, Quilliet C, Coupier G. Buckling of lipidic ultrasound contrast agents under quasi-static load. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2023; 381:20220025. [PMID: 36774952 DOI: 10.1098/rsta.2022.0025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 11/10/2022] [Indexed: 06/18/2023]
Abstract
Collapse of lipidic ultrasound contrast agents under high-frequency compressive load has been historically interpreted by the vanishing of surface tension. By contrast, buckling of elastic shells is known to occur when costly compressible stress is released through bending. Through quasi-static compression experiments on lipidic shells, we analyse the buckling events in the framework of classical elastic buckling theory and deduce the mechanical characteristics of these shells. They are then compared with that obtained through acoustic characterization. This article is part of the theme issue 'Probing and dynamics of shock sensitive shells'.
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Affiliation(s)
- Georges Chabouh
- Université Grenoble Alpes, CNRS, LIPhy, Grenoble 38000, France
| | - Benjamin van Elburg
- Physics of Fluids Group, Technical Medical (TechMed) Center and MESA+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands
| | - Michel Versluis
- Physics of Fluids Group, Technical Medical (TechMed) Center and MESA+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands
| | - Tim Segers
- BIOS/Lab-on-a-Chip Group, Max Planck Center Twente for Complex Fluid Dynamics, MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands
| | | | - Gwennou Coupier
- Université Grenoble Alpes, CNRS, LIPhy, Grenoble 38000, France
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Tu L, Liao Z, Luo Z, Wu Y, Herrmann A, Huo S. Ultrasound-controlled drug release and drug activation for cancer therapy. EXPLORATION (BEIJING, CHINA) 2021; 1:20210023. [PMID: 37323693 PMCID: PMC10190934 DOI: 10.1002/exp.20210023] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 12/02/2021] [Indexed: 06/15/2023]
Abstract
Traditional chemotherapy suffers from severe toxicity and side effects that limit its maximum application in cancer therapy. To overcome this challenge, an ideal treatment strategy would be to selectively control the release or regulate the activity of drugs to minimize the undesirable toxicity. Recently, ultrasound (US)-responsive drug delivery systems (DDSs) have attracted significant attention due to the non-invasiveness, high tissue penetration depth, and spatiotemporal controllability of US. Moreover, the US-induced mechanical force has been proven to be a robust method to site-selectively rearrange or cleave bonds in mechanochemistry. This review describes the US-activated DDSs from the fundamental basics and aims to present a comprehensive summary of the current understanding of US-responsive DDSs for controlled drug release and drug activation. First, we summarize the typical mechanisms for US-responsive drug release and drug activation. Second, the main factors affecting the ultrasonic responsiveness of drug carriers are outlined. Furthermore, representative examples of US-controlled drug release and drug activation are discussed, emphasizing their novelty and design principles. Finally, the challenges and an outlook on this promising therapeutic strategy are discussed.
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Affiliation(s)
- Li Tu
- Fujian Provincial Key Laboratory of Innovative Drug Target ResearchSchool of Pharmaceutical SciencesXiamen UniversityXiamenP. R. China
| | - Zhihuan Liao
- Fujian Provincial Key Laboratory of Innovative Drug Target ResearchSchool of Pharmaceutical SciencesXiamen UniversityXiamenP. R. China
| | - Zheng Luo
- Fujian Provincial Key Laboratory of Innovative Drug Target ResearchSchool of Pharmaceutical SciencesXiamen UniversityXiamenP. R. China
| | - Yun‐Long Wu
- Fujian Provincial Key Laboratory of Innovative Drug Target ResearchSchool of Pharmaceutical SciencesXiamen UniversityXiamenP. R. China
| | - Andreas Herrmann
- DWI – Leibniz Institute for Interactive MaterialsAachenGermany
- Institute of Technical and Macromolecular ChemistryRWTH Aachen UniversityAachenGermany
| | - Shuaidong Huo
- Fujian Provincial Key Laboratory of Innovative Drug Target ResearchSchool of Pharmaceutical SciencesXiamen UniversityXiamenP. R. China
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Deprez J, Lajoinie G, Engelen Y, De Smedt SC, Lentacker I. Opening doors with ultrasound and microbubbles: Beating biological barriers to promote drug delivery. Adv Drug Deliv Rev 2021; 172:9-36. [PMID: 33705877 DOI: 10.1016/j.addr.2021.02.015] [Citation(s) in RCA: 101] [Impact Index Per Article: 33.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 02/01/2021] [Accepted: 02/17/2021] [Indexed: 12/13/2022]
Abstract
Apart from its clinical use in imaging, ultrasound has been thoroughly investigated as a tool to enhance drug delivery in a wide variety of applications. Therapeutic ultrasound, as such or combined with cavitating nuclei or microbubbles, has been explored to cross or permeabilize different biological barriers. This ability to access otherwise impermeable tissues in the body makes the combination of ultrasound and therapeutics very appealing to enhance drug delivery in situ. This review gives an overview of the most important biological barriers that can be tackled using ultrasound and aims to provide insight on how ultrasound has shown to improve accessibility as well as the biggest hurdles. In addition, we discuss the clinical applicability of therapeutic ultrasound with respect to the main challenges that must be addressed to enable the further progression of therapeutic ultrasound towards an effective, safe and easy-to-use treatment tailored for drug delivery in patients.
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Affiliation(s)
- J Deprez
- Ghent Research Group on Nanomedicines, Department of Pharmaceutics, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium; Cancer Research Institute Ghent (CRIG), Ghent, Belgium
| | - G Lajoinie
- Physics of Fluids Group, MESA+ Institute for Nanotechnology and Technical Medical (TechMed) Center, University of Twente, P.O. Box 217, 7500 AE Enschede, Netherlands
| | - Y Engelen
- Ghent Research Group on Nanomedicines, Department of Pharmaceutics, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium; Cancer Research Institute Ghent (CRIG), Ghent, Belgium
| | - S C De Smedt
- Ghent Research Group on Nanomedicines, Department of Pharmaceutics, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium; Cancer Research Institute Ghent (CRIG), Ghent, Belgium.
| | - I Lentacker
- Ghent Research Group on Nanomedicines, Department of Pharmaceutics, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium; Cancer Research Institute Ghent (CRIG), Ghent, Belgium
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Helbert A, Gaud E, Segers T, Botteron C, Frinking P, Jeannot V. Monodisperse versus Polydisperse Ultrasound Contrast Agents: In Vivo Sensitivity and safety in Rat and Pig. ULTRASOUND IN MEDICINE & BIOLOGY 2020; 46:3339-3352. [PMID: 33008649 DOI: 10.1016/j.ultrasmedbio.2020.07.031] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 07/24/2020] [Accepted: 07/30/2020] [Indexed: 05/21/2023]
Abstract
Recent advances in the field of monodisperse microbubble synthesis by flow focusing allow for the production of foam-free, highly concentrated and monodisperse lipid-coated microbubble suspensions. It has been found that in vitro, such monodisperse ultrasound contrast agents (UCAs) improve the sensitivity of contrast-enhanced ultrasound imaging. Here, we present the first in vivo study in the left ventricle of rat and pig with this new monodisperse bubble agent. We systematically characterize the acoustic sensitivity and safety of the agent at an imaging frequency of 2.5 MHz as compared with three commercial polydisperse UCAs (SonoVue/Lumason, Definity/Luminity and Optison) and one research-grade polydisperse agent with the same shell composition as the monodisperse bubbles. The monodisperse microbubbles, which had a diameter of 4.2 μm, crossed the pulmonary vasculature, and their echo signal could be measured at least as long as that of the polydisperse UCAs, indicating that microfluidically formed monodisperse microbubbles are stable in vivo. Furthermore, it was found that the sensitivity of the monodisperse agent, expressed as the mean echo power per injected bubble, was at least 10 times higher than that of the polydisperse UCAs. Finally, the safety profile of the monodisperse microbubble suspension was evaluated by injecting 400 and 2000 times the imaging dose, and neither physiologic nor pathologic changes were found, which is a first indication that monodisperse lipid-coated microbubbles formed by flow focusing are safe for in vivo use. The more uniform acoustic response and corresponding increased imaging sensitivity of the monodisperse agent may boost emerging applications of microbubbles and ultrasound such as molecular imaging and therapy.
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Affiliation(s)
- Alexandre Helbert
- Bracco Suisse S.A., Route de la Galaise 31, 1228 Plan-les-Ouates, Switzerland
| | - Emmanuel Gaud
- Bracco Suisse S.A., Route de la Galaise 31, 1228 Plan-les-Ouates, Switzerland
| | - Tim Segers
- Physics of Fluids Group, MESA + Institute for Nanotechnology, Technical Medical (TechMed) Center, University of Twente, Enschede, The Netherlands; Former employee of Bracco Suisse S.A
| | | | | | - Victor Jeannot
- Bracco Suisse S.A., Route de la Galaise 31, 1228 Plan-les-Ouates, Switzerland.
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Kiessling F. US Microbubbles as Smart Sensors of Portal Venous Pressure. Radiology 2020; 298:112-113. [PMID: 33206005 DOI: 10.1148/radiol.2020203753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Fabian Kiessling
- From the Institute for Experimental Molecular Imaging, Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University, Forckenbeckstrasse 55, 52074 Aachen, Germany; and Fraunhofer MEVIS, Institute for Medical Image Computing, Aachen, Germany
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Molecular Ultrasound Imaging. NANOMATERIALS 2020; 10:nano10101935. [PMID: 32998422 PMCID: PMC7601169 DOI: 10.3390/nano10101935] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 09/21/2020] [Accepted: 09/22/2020] [Indexed: 02/07/2023]
Abstract
In the last decade, molecular ultrasound imaging has been rapidly progressing. It has proven promising to diagnose angiogenesis, inflammation, and thrombosis, and many intravascular targets, such as VEGFR2, integrins, and selectins, have been successfully visualized in vivo. Furthermore, pre-clinical studies demonstrated that molecular ultrasound increased sensitivity and specificity in disease detection, classification, and therapy response monitoring compared to current clinically applied ultrasound technologies. Several techniques were developed to detect target-bound microbubbles comprising sensitive particle acoustic quantification (SPAQ), destruction-replenishment analysis, and dwelling time assessment. Moreover, some groups tried to assess microbubble binding by a change in their echogenicity after target binding. These techniques can be complemented by radiation force ultrasound improving target binding by pushing microbubbles to vessel walls. Two targeted microbubble formulations are already in clinical trials for tumor detection and liver lesion characterization, and further clinical scale targeted microbubbles are prepared for clinical translation. The recent enormous progress in the field of molecular ultrasound imaging is summarized in this review article by introducing the most relevant detection technologies, concepts for targeted nano- and micro-bubbles, as well as their applications to characterize various diseases. Finally, progress in clinical translation is highlighted, and roadblocks are discussed that currently slow the clinical translation.
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Shang H, Wu B, Liang X, Sun Y, Han X, Zhang L, Wang Q, Cheng W. Evaluation of therapeutic effect of targeting nanobubbles conjugated with NET-1 siRNA by shear wave elastography: an in vivo study of hepatocellular carcinoma bearing mice model. Drug Deliv 2020; 26:944-951. [PMID: 31544556 PMCID: PMC6764407 DOI: 10.1080/10717544.2019.1667450] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
This study aimed at investigating the tumor stiffness of hepatocellular carcinoma (HCC) bearing mice model in vivo to evaluate the therapeutic efficacy of targeting nanobubbles (TNBS) conjugated with NET-1 siRNA (NET-1 siRNA-TNBS). Also tested whether shear wave elastography (SWE) could demonstrate the pathological tumor changes and used to monitor therapeutic efficacy as a noninvasive method. The HCC bearing mice model was established by injecting human HCC cell line (HepG2). The mice were then divided into three groups randomly, and were treated with TNBS conjugated with NET-1 siRNA, TNBS conjugated with negative control gene, and saline as control. US-SWE was performed for three times. SWE values of all the tumors in three groups were increased with tumor growth. Emax was correlated with tumor size (p < .05). NET-1 gene (treatment group) significantly delayed the growth of tumor size compared to other two groups (p < .0001), showing a significantly increased Emax (p < .05). Immunohistochemical results showed that the NET-1 protein expression was significantly lower than the negative control and blank groups. In conclusion, TNBS conjugated with NET-1 siRNA inhibited tumor growth and prolonged the life of experimental animals. SWE provided a noninvasive and real time imaging method to detect the changes in tumor development.
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Affiliation(s)
- Haitao Shang
- Department of Ultrasound, Harbin Medical University Cancer Hospital , Harbin , China
| | - Bolin Wu
- Department of Ultrasound, Harbin Medical University Cancer Hospital , Harbin , China
| | - Xitian Liang
- Department of Ultrasound, Harbin Medical University Cancer Hospital , Harbin , China
| | - Yixin Sun
- Department of Ultrasound, Harbin Medical University Cancer Hospital , Harbin , China
| | - Xue Han
- Department of Ultrasound, Harbin Medical University Cancer Hospital , Harbin , China
| | - Lei Zhang
- Department of Ultrasound, Harbin Medical University Cancer Hospital , Harbin , China
| | - Qiucheng Wang
- Department of Ultrasound, Harbin Medical University Cancer Hospital , Harbin , China
| | - Wen Cheng
- Department of Ultrasound, Harbin Medical University Cancer Hospital , Harbin , China
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Wischhusen J, Padilla F. Ultrasound Molecular Imaging with Targeted Microbubbles for Cancer Diagnostics: From Bench to Bedside. Ing Rech Biomed 2019. [DOI: 10.1016/j.irbm.2018.10.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Li M, Liu Y, Chen J, Liu T, Gu Z, Zhang J, Gu X, Teng G, Yang F, Gu N. Platelet bio-nanobubbles as microvascular recanalization nanoformulation for acute ischemic stroke lesion theranostics. Theranostics 2018; 8:4870-4883. [PMID: 30429874 PMCID: PMC6217069 DOI: 10.7150/thno.27466] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Accepted: 08/02/2018] [Indexed: 01/01/2023] Open
Abstract
Since the expected therapeutic results of ischemic stroke are strictly time dependent, early and accurate diagnosis as well as short intervals between diagnosis and treatment are key factors for the survival of stroke patients. In this study, we fabricated platelet (PLT) membrane-derived biomimetic nanobubbles (PNBs) for timely perfusion intervention and ultrasound imaging of acute ischemic stroke. Methods: The PNBs are fabricated by sonication-assisted reassembly of repeatedly freeze-thawed live platelet-derived PLT membrane vesicles (PMVs). The TEM, SEM, EDS and DLS were used to analyze the morphology and physicochemical properties of PNBs. The HPLC and LC-MS/MS were applied to confirm the lipid and protein compositions of PNBs. The in vitro macrophage uptake and platelet aggregation of PNBs were designed to examine the immune escape and thrombotic response characteristics. Furthermore, based on a photothrombotic ischemic stroke mouse model, the biodistribution, stroke microvascular network change, as well as cerebral blood flow of PNBs were studied by using near-infrared fluorescence imaging, multimodal optical imaging, and full-field laser perfusion imager. Finally, we assessed the brain ultrasound imaging of PNBs with a high-resolution micro-imaging system using both B-mode and contrast mode. Results: The natural lipid and protein components isolated from PLT membrane endow the PNBs with accurate lesion-targeting ability. The preferentially accumulated PNBs exhibit microvascular bio-remodeling ability of the stroke lesion, which is critical for recanalization of the obstructed vessels to protect the neural cells around the ischemic region of the stroke. Furthermore, with the increased accumulation of PNBs clusters in the lesion, PNBs in the lesion can be monitored by real-time contrast-enhanced ultrasound imaging to indicate the severity and dynamic development of the stroke. Conclusions: In summary, platelet membrane-based nanobubbles for targeting acute ischemic lesions were developed as microvascular recanalization nanoformulation for acute ischemic stroke lesion theranostics. This biomimetic PNBs theranostic strategy will be valuable for ischemic stroke patients in the future.
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Affiliation(s)
- Mingxi Li
- State key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Sciences & Medical Engineering, Southeast University, Nanjing, 210096, China
- Collaborative Innovation Center of Suzhou Nano-Science and Technology, Southeast University, Suzhou 215123, China
| | - Yang Liu
- State key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Sciences & Medical Engineering, Southeast University, Nanjing, 210096, China
- Collaborative Innovation Center of Suzhou Nano-Science and Technology, Southeast University, Suzhou 215123, China
| | - Jinpeng Chen
- Jiangsu Key Laboratory of Molecular and Functional Imaging, Department of Microbiology and Immunology, Medical School, Southeast University, Nanjing 210009, China
| | - Taotao Liu
- State key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Sciences & Medical Engineering, Southeast University, Nanjing, 210096, China
| | - Zhuxiao Gu
- Collaborative Innovation Center of Suzhou Nano-Science and Technology, Southeast University, Suzhou 215123, China
| | - Jianqiong Zhang
- Jiangsu Key Laboratory of Molecular and Functional Imaging, Department of Microbiology and Immunology, Medical School, Southeast University, Nanjing 210009, China
| | - Xiaochun Gu
- Jiangsu Key Laboratory of Molecule and Functional Imaging, Department of Radiology, Zhongda Hospital, Medical Schoool, Southeast University, Nanjing 210009, PR China
| | - Gaojun Teng
- Jiangsu Key Laboratory of Molecule and Functional Imaging, Department of Radiology, Zhongda Hospital, Medical Schoool, Southeast University, Nanjing 210009, PR China
| | - Fang Yang
- State key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Sciences & Medical Engineering, Southeast University, Nanjing, 210096, China
- Collaborative Innovation Center of Suzhou Nano-Science and Technology, Southeast University, Suzhou 215123, China
| | - Ning Gu
- State key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Sciences & Medical Engineering, Southeast University, Nanjing, 210096, China
- Collaborative Innovation Center of Suzhou Nano-Science and Technology, Southeast University, Suzhou 215123, China
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Abstract
OBJECTIVES The aim of this study was to demonstrate a new clinically translatable ultrasound molecular imaging approach, modulated acoustic radiation force-based imaging, which is capable of rapid and reliable detection of inflammation as validated in mouse abdominal aorta. MATERIALS AND METHODS Animal studies were approved by the Institutional Animal Care and Use Committee at the University of Virginia. C57BL/6 mice stimulated with tumor necrosis factor α, or fed with a high-fat diet, were used as inflammation (MInflammation) and diet-induced obesity (DIO) (MDIO) models, respectively. C57BL/6 mice, not exposed to tumor necrosis factor α or DIO, were used as controls (MNormal). P-selectin-targeted (MBP-selectin), vascular cell adhesion molecule (VCAM)-1-targeted (MBVCAM-1), and isotype control (MBControl) microbubbles were synthesized by conjugating anti-P-selectin, anti-VCAM-1, and isotype control antibodies to microbubbles, respectively. The abdominal aortas were imaged for 180 seconds during a constant infusion of microbubbles. A parameter, residual-to-saturation ratio (RSR), was used to assess P-selectin and VCAM-1. Statistical analysis was performed with the Student t test. RESULTS For the inflammation model, RSR of the MInflammation + MBP-selectin group was significantly higher (40.9%, P < 0.0005) than other groups. For the DIO model, RSR of the MDIO + MBVCAM-1 group was significantly higher (60.0%, P < 0.0005) than other groups. Immunohistochemistry staining of the abdominal aorta confirmed the expression of P-selectin and VCAM-1. CONCLUSIONS A statistically significant assessment of P-selectin and VCAM-1 in mouse abdominal aorta was achieved. This technique yields progress toward rapid targeted molecular imaging in large blood vessels and thus has the potential for early diagnosis, treatment selection, and risk stratification of atherosclerosis.
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Zhu L, Zhao H, Zhou Z, Xia Y, Wang Z, Ran H, Li P, Ren J. Peptide-Functionalized Phase-Transformation Nanoparticles for Low Intensity Focused Ultrasound-Assisted Tumor Imaging and Therapy. NANO LETTERS 2018; 18:1831-1841. [PMID: 29419305 DOI: 10.1021/acs.nanolett.7b05087] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
In this study, we successfully developed novel tumor homing-penetrating peptide-functionalized drug-loaded phase-transformation nanoparticles (tLyP-1-10-HCPT-PFP NPs) for low intensity focused ultrasound (LIFU)-assisted tumor ultrasound molecular imaging and precise therapy. With the nanoscale particle size, tLyP-1-10-HCPT-PFP NPs could pass through the tumor vascular endothelial cell gap. Induced by tLyP-1 peptide with targeting and penetrating efficiency, tLyP-1-10-HCPT-PFP NPs could increase tumor accumulation and penetrate deeply into the extravascular tumor tissue, penetrating through extracellular matrix and the cellular membrane to the cytoplasm. With LIFU assistance, tLyP-1-10-HCPT-PFP NPs could phase-transform into microbubbles and enhance tumor ultrasound molecular imaging for tumor diagnosis. Furthermore, after further irradiation by LIFU, an intracellular "explosion effect" caused by acoustic droplet vaporization, ultrasound targeted microbubble destruction, and release of 10-HCPT could realize physicochemical synergistic antitumor therapy.
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Affiliation(s)
- LeiLei Zhu
- Ultrasound Department of the Second Affiliated Hospital of Chongqing Medical University , Chongqing 400010 , China
- Chongqing Key Laboratory of Ultrasound Molecular Imaging , Chongqing 400010 , China
| | - HongYun Zhao
- Chongqing Key Laboratory of Ultrasound Molecular Imaging , Chongqing 400010 , China
| | - ZhiYi Zhou
- Chongqing Key Laboratory of Ultrasound Molecular Imaging , Chongqing 400010 , China
| | - YongHong Xia
- Chongqing Key Laboratory of Ultrasound Molecular Imaging , Chongqing 400010 , China
| | - ZhiGang Wang
- Ultrasound Department of the Second Affiliated Hospital of Chongqing Medical University , Chongqing 400010 , China
- Chongqing Key Laboratory of Ultrasound Molecular Imaging , Chongqing 400010 , China
| | - HaiTao Ran
- Ultrasound Department of the Second Affiliated Hospital of Chongqing Medical University , Chongqing 400010 , China
- Chongqing Key Laboratory of Ultrasound Molecular Imaging , Chongqing 400010 , China
| | - Pan Li
- Ultrasound Department of the Second Affiliated Hospital of Chongqing Medical University , Chongqing 400010 , China
- Chongqing Key Laboratory of Ultrasound Molecular Imaging , Chongqing 400010 , China
| | - JianLi Ren
- Ultrasound Department of the Second Affiliated Hospital of Chongqing Medical University , Chongqing 400010 , China
- Chongqing Key Laboratory of Ultrasound Molecular Imaging , Chongqing 400010 , China
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12
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Wang S, Hossack JA, Klibanov AL. Targeting of microbubbles: contrast agents for ultrasound molecular imaging. J Drug Target 2018; 26:420-434. [PMID: 29258335 DOI: 10.1080/1061186x.2017.1419362] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
For contrast ultrasound imaging, the most efficient contrast agents comprise highly compressible gas-filled microbubbles. These micrometer-sized particles are typically filled with low-solubility perfluorocarbon gases, and coated with a thin shell, often a lipid monolayer. These particles circulate in the bloodstream for several minutes; they demonstrate good safety and are already in widespread clinical use as blood pool agents with very low dosage necessary (sub-mg per injection). As ultrasound is an ubiquitous medical imaging modality, with tens of millions of exams conducted annually, its use for molecular/targeted imaging of biomarkers of disease may enable wider implementation of personalised medicine applications, precision medicine, non-invasive quantification of biomarkers, targeted guidance of biopsy and therapy in real time. To achieve this capability, microbubbles are decorated with targeting ligands, possessing specific affinity towards vascular biomarkers of disease, such as tumour neovasculature or areas of inflammation, ischaemia-reperfusion injury or ischaemic memory. Once bound to the target, microbubbles can be selectively visualised to delineate disease location by ultrasound imaging. This review discusses the general design trends and approaches for such molecular ultrasound imaging agents, which are currently at the advanced stages of development, and are evolving towards widespread clinical trials.
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Affiliation(s)
- Shiying Wang
- a Department of Biomedical Engineering , University of Virginia , Charlottesville , VA , USA
| | - John A Hossack
- a Department of Biomedical Engineering , University of Virginia , Charlottesville , VA , USA
| | - Alexander L Klibanov
- a Department of Biomedical Engineering , University of Virginia , Charlottesville , VA , USA.,b Cardiovascular Division (Department of Medicine), Robert M Berne Cardiovascular Research Center , University of Virginia , Charlottesville , VA , USA
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13
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The Use of Acoustic Radiation Force Decorrelation-Weighted Pulse Inversion for Enhanced Ultrasound Contrast Imaging. Invest Radiol 2017; 52:95-102. [PMID: 27495188 DOI: 10.1097/rli.0000000000000313] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
OBJECTIVES The use of ultrasound imaging for cancer diagnosis and screening can be enhanced with the use of molecularly targeted microbubbles. Nonlinear imaging strategies such as pulse inversion (PI) and "contrast pulse sequences" (CPS) can be used to differentiate microbubble signal, but often fail to suppress highly echogenic tissue interfaces. This failure results in false-positive detection and potential misdiagnosis. In this study, a novel acoustic radiation force (ARF)-based approach was developed for superior microbubble signal detection. The feasibility of this technique, termed ARF decorrelation-weighted PI (ADW-PI), was demonstrated in vivo using a subcutaneous mouse tumor model. MATERIALS AND METHODS Tumors were implanted in the hindlimb of C57BL/6 mice by subcutaneous injection of MC38 cells. Lipid-shelled microbubbles were conjugated to anti-VEGFR2 antibody and administered via bolus injection. An image sequence using ARF pulses to generate microbubble motion was combined with PI imaging on a Verasonics Vantage programmable scanner. ADW-PI images were generated by combining PI images with interframe signal decorrelation data. For comparison, CPS images of the same mouse tumor were acquired using a Siemens Sequoia clinical scanner. RESULTS Microbubble-bound regions in the tumor interior exhibited significantly higher signal decorrelation than static tissue (n = 9, P < 0.001). The application of ARF significantly increased microbubble signal decorrelation (n = 9, P < 0.01). Using these decorrelation measurements, ADW-PI imaging demonstrated significantly improved microbubble contrast-to-tissue ratio when compared with corresponding CPS or PI images (n = 9, P < 0.001). Contrast-to-tissue ratio improved with ADW-PI by approximately 3 dB compared with PI images and 2 dB compared with CPS images. CONCLUSIONS Acoustic radiation force can be used to generate adherent microbubble signal decorrelation without microbubble bursting. When combined with PI, measurements of the resulting microbubble signal decorrelation can be used to reconstruct images that exhibit superior suppression of highly echogenic tissue interfaces when compared with PI or CPS alone.
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Sennoga CA, Kanbar E, Auboire L, Dujardin PA, Fouan D, Escoffre JM, Bouakaz A. Microbubble-mediated ultrasound drug-delivery and therapeutic monitoring. Expert Opin Drug Deliv 2016; 14:1031-1043. [DOI: 10.1080/17425247.2017.1266328] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Charles A. Sennoga
- UMR Imagerie et Cerveau, Inserm U930, Université François Rabelais, Tours, France
| | - Emma Kanbar
- UMR Imagerie et Cerveau, Inserm U930, Université François Rabelais, Tours, France
| | - Laurent Auboire
- UMR Imagerie et Cerveau, Inserm U930, Université François Rabelais, Tours, France
| | | | - Damien Fouan
- UMR Imagerie et Cerveau, Inserm U930, Université François Rabelais, Tours, France
| | - Jean-Michel Escoffre
- UMR Imagerie et Cerveau, Inserm U930, Université François Rabelais, Tours, France
| | - Ayache Bouakaz
- UMR Imagerie et Cerveau, Inserm U930, Université François Rabelais, Tours, France
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15
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Optical Verification of Microbubble Response to Acoustic Radiation Force in Large Vessels With In Vivo Results. Invest Radiol 2016; 50:772-84. [PMID: 26135018 DOI: 10.1097/rli.0000000000000185] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
OBJECTIVE The objective of this study was to optically verify the dynamic behaviors of adherent microbubbles in large blood vessel environments in response to a new ultrasound technique using modulated acoustic radiation force. MATERIALS AND METHODS Polydimethylsiloxane (PDMS) flow channels coated with streptavidin were used in targeted groups to mimic large blood vessels. The custom-modulated acoustic radiation force beam sequence was programmed on a Verasonics research scanner. In vitro experiments were performed by injecting a biotinylated lipid-perfluorobutane microbubble dispersion through flow channels. The dynamic response of adherent microbubbles was detected acoustically and simultaneously visualized using a video camera connected to a microscope. In vivo verification was performed in a large abdominal blood vessel of a murine model for inflammation with injection of biotinylated microbubbles conjugated with P-selectin antibody. RESULTS Aggregates of adherent microbubbles were observed optically under the influence of acoustic radiation force. Large microbubble aggregates were observed solely in control groups without targeted adhesion. Additionally, the dispersion of microbubble aggregates were demonstrated to lead to a transient acoustic signal enhancement in control groups (a new phenomenon we refer to as "control peak"). In agreement with in vitro results, the control peak phenomenon was observed in vivo in a murine model. CONCLUSIONS This study provides the first optical observation of microbubble-binding dynamics in large blood vessel environments with application of a modulated acoustic radiation force beam sequence. With targeted adhesion, secondary radiation forces were unable to produce large aggregates of adherent microbubbles. Additionally, the new phenomenon called control peak was observed both in vitro and in vivo in a murine model for the first time. The findings in this study provide us with a better understanding of microbubble behaviors in large blood vessel environments with application of acoustic radiation force and could potentially guide future beam sequence designs or signal processing routines for enhanced ultrasound molecular imaging.
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Mikhalin AA, Evdokimov NM, Frolova LV, Magedov IV, Kornienko A, Johnston R, Rogelj S, Tartis MS. Lipophilic prodrug conjugates allow facile and rapid synthesis of high-loading capacity liposomes without the need for post-assembly purification. J Liposome Res 2015; 25:232-260. [PMID: 25534989 PMCID: PMC4478286 DOI: 10.3109/08982104.2014.992022] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Dihydropyridopyrazoles are simplified synthetic analogues of podophyllotoxin that can effectively mimic its molecular scaffold and act as potent mitotic spindle poisons in dividing cancer cells. However, despite nanomolar potencies and ease of synthetic preparation, further clinical development of these promising anticancer agents is hampered due to their poor aqueous solubility. In this article, we developed a prodrug strategy that enables incorporation of dihydropyridopyrazoles into liposome bilayers to overcome the solubility issues. The active drug was covalently connected to either myristic or palmitic acid anchor via carboxylesterase hydrolyzable linkage. The resulting prodrugs were self-assembled into liposome bilayers from hydrated lipid films using ultrasound without the need for post-assembly purification. The average particle size of the prodrug-loaded liposomes was about 90 nm. The prodrug incorporation was verified by differential scanning calorimetry, spectrophotometry and gel filtration reaching maximum at 0.3 and 0.35 prodrug/lipid molar ratios for myristic and palmitic conjugates, respectively. However, the ratio of 0.2 was used in the particle size and biological activity experiments to maintain long-term stability of the prodrug-loaded liposomes against phase separation during storage. Antiproliferative activity was tested against HeLa and Jurkat cancer cell lines in vitro showing that the liposomal prodrug retained antitubulin activity of the parent drug and induced apoptosis-mediated cancer cell death. Overall, the established data provide a powerful platform for further clinical development of dihydropyridopyrazoles using liposomes as the drug delivery system.
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Affiliation(s)
- Alexander A. Mikhalin
- Department of Biology, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, USA
- Department of Chemical Engineering, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, USA
| | - Nikolai M. Evdokimov
- Department of Chemistry, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, USA
| | - Liliya V. Frolova
- Department of Chemistry, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, USA
| | - Igor V. Magedov
- Department of Chemistry, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, USA
| | - Alexander Kornienko
- Department of Chemistry, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, USA
| | - Robert Johnston
- Department of Materials Engineering, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, USA
| | - Snezna Rogelj
- Department of Biology, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, USA
| | - Michaelann S. Tartis
- Department of Biology, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, USA
- Department of Materials Engineering, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, USA
- Department of Chemical Engineering, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, USA
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17
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Schutt CE, Ibsen SD, Thrift W, Esener SC. The influence of distance between microbubbles on the fluid flow produced during ultrasound exposure. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2014; 136:3422. [PMID: 25480086 PMCID: PMC4257971 DOI: 10.1121/1.4898422] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The collapse dynamics of lipid monolayer-coated microbubbles in the clinically-relevant size range under 6 μm in diameter have not been studied directly due to their small size obscuring the collapse visualization. This study investigates the influence of inter-microbubble distance on the shape of lipid debris clouds created by the collapse of the microbubble destroying the microbubble lipid monolayer. The shape was highly influenced by the fluid motion that occurred as the microbubbles collapsed. It was observed that at inter-microbubble distances smaller than 37 μm the microbubbles began to interact with one another resulting in distorted and ellipsoid-shaped debris clouds. At inter-microbubble distances less than 10 μm, significantly elongated debris clouds were observed that extended out from the original microbubble location in a single direction. These distortions show a significant distance-dependent interaction between microbubbles. It was observed that microbubbles in physical contact with one another behaved in the same manner as separate microbubbles less than 10 μm apart creating significantly elongated debris clouds. It can be hypothesized that small inter-microbubble distances influence the microbubble to collapse asymmetrically resulting in the creation of fluid jets that contribute to the formation of debris fields that are elongated in a single direction.
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Affiliation(s)
- Carolyn E Schutt
- Department of Bioengineering, University of California San Diego, 9500 Gilman Drive MC 0412, La Jolla, California 92093-0412
| | - Stuart D Ibsen
- Moores Cancer Center, University of California San Diego, La Jolla, California 92093
| | - William Thrift
- Department of Nanoengineering, University of California San Diego, La Jolla, California 92093
| | - Sadik C Esener
- Department of Nanoengineering, University of California San Diego, La Jolla, California 92093
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18
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Dalecki D, Hocking DC. Ultrasound technologies for biomaterials fabrication and imaging. Ann Biomed Eng 2014; 43:747-61. [PMID: 25326439 DOI: 10.1007/s10439-014-1158-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 10/09/2014] [Indexed: 01/19/2023]
Abstract
Ultrasound is emerging as a powerful tool for developing biomaterials for regenerative medicine. Ultrasound technologies are finding wide-ranging, innovative applications for controlling the fabrication of bioengineered scaffolds, as well as for imaging and quantitatively monitoring the properties of engineered constructs both during fabrication processes and post-implantation. This review provides an overview of the biomedical applications of ultrasound for imaging and therapy, a tutorial of the physical mechanisms through which ultrasound can interact with biomaterials, and examples of how ultrasound technologies are being developed and applied for biomaterials fabrication processes, non-invasive imaging, and quantitative characterization of bioengineered scaffolds in vitro and in vivo.
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Affiliation(s)
- Diane Dalecki
- Department of Biomedical Engineering, University of Rochester, 310 Goergen Hall, P.O. Box 270168, Rochester, NY, 14627, USA,
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19
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Juffermans LJM, Meijering BDM, Henning RH, Deelman LE. Ultrasound and microbubble-targeted delivery of small interfering RNA into primary endothelial cells is more effective than delivery of plasmid DNA. ULTRASOUND IN MEDICINE & BIOLOGY 2014; 40:532-540. [PMID: 24361223 DOI: 10.1016/j.ultrasmedbio.2013.09.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2012] [Revised: 09/27/2013] [Accepted: 09/30/2013] [Indexed: 06/03/2023]
Abstract
Ultrasound and microbubble-targeted delivery (UMTD) is a promising non-viral technique for genetic-based therapy. We found that UMTD of small interfering RNA (siRNA) is more effective than delivery of plasmid DNA (pDNA). UMTD (1 MHz, 0.22 MPa) of fluorescently labeled siRNA resulted in 97.9 ± 1.5% transfected cells, with siRNA localized homogenously in the cytoplasm directly after ultrasound exposure. UMTD of fluorescently labeled pDNA resulted in only 43.0 ± 4.2% transfected cells, with localization mainly in vesicular structures, co-localizing with endocytosis markers clathrin and caveolin. Delivery of siRNA against GAPDH (glyceraldehyde-3-phosphate dehydrogenase) effectively decreased protein levels to 24.3 ± 7.9% of non-treated controls (p < 0.01). In contrast, 24 h after delivery of pDNA encoding GAPDH, no increase in protein levels was detected. Transfection efficiency, verified with red fluorescently labeled pDNA encoding enhanced green fluorescent protein, revealed that of the transfected cells, only 2.0 ± 0.7% expressed the transgene. In conclusion, the difference in localization between siRNA and pDNA after UMTD is an important determinant of the effectiveness of these genetic-based technologies.
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Affiliation(s)
- Lynda J M Juffermans
- Departments of Physiology and Cardiology, VU University Medical Center, Amsterdam, The Netherlands; Department of Clinical Pharmacology, Groningen Institute for Drug Exploration (GUIDE), University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
| | - Bernadet D M Meijering
- Department of Clinical Pharmacology, Groningen Institute for Drug Exploration (GUIDE), University Medical Center Groningen, University of Groningen, Groningen, The Netherlands; Interuniversity Cardiology Institute of the Netherlands, Utrecht, The Netherlands
| | - Robert H Henning
- Department of Clinical Pharmacology, Groningen Institute for Drug Exploration (GUIDE), University Medical Center Groningen, University of Groningen, Groningen, The Netherlands; Interuniversity Cardiology Institute of the Netherlands, Utrecht, The Netherlands
| | - Leo E Deelman
- Department of Clinical Pharmacology, Groningen Institute for Drug Exploration (GUIDE), University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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20
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Wang S, Hossack JA, Klibanov AL, Mauldin FW. Binding dynamics of targeted microbubbles in response to modulated acoustic radiation force. Phys Med Biol 2014; 59:465-84. [PMID: 24374866 PMCID: PMC4068277 DOI: 10.1088/0031-9155/59/2/465] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Detection of molecular targeted microbubbles plays a foundational role in ultrasound-based molecular imaging and targeted gene or drug delivery. In this paper, an empirical model describing the binding dynamics of targeted microbubbles in response to modulated acoustic radiation forces in large vessels is presented and experimentally verified using tissue-mimicking flow phantoms. Higher flow velocity and microbubble concentration led to faster detaching rates for specifically bound microbubbles (p < 0.001). Higher time-averaged acoustic radiation force intensity led to faster attaching rates and a higher saturation level of specifically bound microbubbles (p < 0.05). The level of residual microbubble signal in targeted experiments after cessation of radiation forces was the only response parameter that was reliably different between targeted and control experiments (p < 0.05). A related parameter, the ratio of residual-to-saturated microbubble signal (Rresid), is proposed as a measurement that is independent of absolute acoustic signal magnitude and therefore able to reliably detect targeted adhesion independently of control measurements (p < 0.01). These findings suggest the possibility of enhanced detection of specifically bound microbubbles in real-time, using relatively short imaging protocols (approximately 3 min), without waiting for free microbubble clearance.
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Affiliation(s)
- Shiying Wang
- Department of Biomedical Engineering, University of Virginia, Charlottesville, VA 22908, USA
| | - John A Hossack
- Department of Biomedical Engineering, University of Virginia, Charlottesville, VA 22908, USA
| | - Alexander L Klibanov
- Department of Biomedical Engineering, University of Virginia, Charlottesville, VA 22908, USA
- Division of Cardiovascular Medicine, University of Virginia, Charlottesville, VA 22908, USA
| | - F William Mauldin
- Department of Biomedical Engineering, University of Virginia, Charlottesville, VA 22908, USA
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21
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Oh JS, Kwon YS, Lee KH, Jeong W, Chung SK, Rhee K. Drug perfusion enhancement in tissue model by steady streaming induced by oscillating microbubbles. Comput Biol Med 2014; 44:37-43. [DOI: 10.1016/j.compbiomed.2013.10.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 10/11/2013] [Accepted: 10/19/2013] [Indexed: 12/20/2022]
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Lanza GM, Moonen C, Baker JR, Chang E, Cheng Z, Grodzinski P, Ferrara K, Hynynen K, Kelloff G, Lee YEK, Patri AK, Sept D, Schnitzer JE, Wood BJ, Zhang M, Zheng G, Farahani K. Assessing the barriers to image-guided drug delivery. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2013; 6:1-14. [PMID: 24339356 DOI: 10.1002/wnan.1247] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Revised: 09/06/2013] [Accepted: 09/09/2013] [Indexed: 12/13/2022]
Abstract
Imaging has become a cornerstone for medical diagnosis and the guidance of patient management. A new field called image-guided drug delivery (IGDD) now combines the vast potential of the radiological sciences with the delivery of treatment and promises to fulfill the vision of personalized medicine. Whether imaging is used to deliver focused energy to drug-laden particles for enhanced, local drug release around tumors, or it is invoked in the context of nanoparticle-based agents to quantify distinctive biomarkers that could risk stratify patients for improved targeted drug delivery efficiency, the overarching goal of IGDD is to use imaging to maximize effective therapy in diseased tissues and to minimize systemic drug exposure in order to reduce toxicities. Over the last several years, innumerable reports and reviews covering the gamut of IGDD technologies have been published, but inadequate attention has been directed toward identifying and addressing the barriers limiting clinical translation. In this consensus opinion, the opportunities and challenges impacting the clinical realization of IGDD-based personalized medicine were discussed as a panel and recommendations were proffered to accelerate the field forward.
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Affiliation(s)
- Gregory M Lanza
- Division of Cardiology, Washington University Medical School, St. Louis, MO, USA
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23
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Couture O, Urban A, Bretagne A, Martinez L, Tanter M, Tabeling P. In vivo targeted delivery of large payloads with an ultrasound clinical scanner. Med Phys 2012; 39:5229-37. [PMID: 22894447 DOI: 10.1118/1.4736822] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
PURPOSE Performing drug-delivery with an ultrasonic imaging scanner in situ could drastically simplify treatment and improve its specificity. Our objective is to deliver large amounts of an encapsulated agent in vivo using a clinical ultrasound scanner with a millimetric resolution. This study describes the encapsulation of fluorescein within ultrasound-inducible composite droplets and its targeted release in predefined zones in the liver of rats. METHODS An aqueous solution of fluorescein was encapsulated within perfluorocarbon liquid in 4 μm monodisperse droplets using a microfluidic system. The agent was then injected within the femoral vein of 12 rats. After exploratory ultrasound imaging, the sonographer defined five zones in the liver and a release sequence was initiated on the same apparatus. The surface of the liver was observed under fluorescence macroscopy and intraoperative fluorescence camera in vivo, before liver samples were sliced for pathology. RESULTS Following the conversion of the droplets, a 25 dB increase in contrast was observed in the zones selected by the sonographer. These hyperechoic regions were colocalized with the bright fluorescent spots observed on the surface of the liver. A minimum peak-negative pressure of 2.6 MPa, which is within regulations for imaging pulses, was required for the delivery of the content of the droplets. The tissue and cellular structures were not affected by the exposure to the release sequence. CONCLUSIONS Since composite droplets can carry various therapeutic and imaging agents, they could deliver such agents specifically in any organ accessible to ultrasound.
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Affiliation(s)
- Olivier Couture
- Institut Langevin, ESPCI, 10 rue Vauquelin, Paris 75005, France.
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Li P, Zheng Y, Ran H, Tan J, Lin Y, Zhang Q, Ren J, Wang Z. Ultrasound triggered drug release from 10-hydroxycamptothecin-loaded phospholipid microbubbles for targeted tumor therapy in mice. J Control Release 2012; 162:349-54. [DOI: 10.1016/j.jconrel.2012.07.009] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Revised: 06/16/2012] [Accepted: 07/08/2012] [Indexed: 11/28/2022]
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26
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Nahire R, Paul S, Scott MD, Singh RK, Muhonen WW, Shabb J, Gange KN, Srivastava DK, Sarkar K, Mallik S. Ultrasound enhanced matrix metalloproteinase-9 triggered release of contents from echogenic liposomes. Mol Pharm 2012; 9:2554-64. [PMID: 22849291 DOI: 10.1021/mp300165s] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The extracellular enzyme matrix metalloproteinase-9 (MMP-9) is overexpressed in atherosclerotic plaques and in metastatic cancers. The enzyme is responsible for rupture of the plaques and for the invasion and metastasis of a large number of cancers. The ability of ultrasonic excitation to induce thermal and mechanical effects has been used to release drugs from different carriers. However, the majority of these studies were performed with low frequency ultrasound (LFUS) at kilohertz frequencies. Clinical usage of LFUS excitations will be limited due to harmful biological effects. Herein, we report our results on the release of encapsulated contents from substrate lipopeptide incorporated echogenic liposomes triggered by recombinant human MMP-9. The contents release was further enhanced by the application of diagnostic frequency (3 MHz) ultrasound. The echogenic liposomes were successfully imaged employing a medical ultrasound transducer (4-15 MHz). The conditioned cell culture media from cancer cells (secreting MMP-9) released the encapsulated dye from the liposomes (30-50%), and this release is also increased (50-80%) by applying diagnostic frequency ultrasound (3 MHz) for 3 min. With further developments, these liposomes have the potential to serve as multimodal carriers for triggered release and simultaneous ultrasound imaging.
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Affiliation(s)
- Rahul Nahire
- Department of Pharmaceutical Sciences, North Dakota State University, Fargo, North Dakota 58108, United States
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27
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Park K. Microbubble ultrasound-guided targeted delivery to tumors. J Control Release 2012; 157:167. [PMID: 22244080 DOI: 10.1016/j.jconrel.2011.12.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2011] [Accepted: 12/12/2011] [Indexed: 01/05/2023]
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