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Wang X, Xu X, Yang Z, Xu X, Han S, Zhang H. Improvement of the effectiveness of sonodynamic therapy: by optimizing components and combination with other treatments. Biomater Sci 2023; 11:7489-7511. [PMID: 37873617 DOI: 10.1039/d3bm00738c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
Sonodynamic therapy (SDT) is an emerging treatment method. In comparison with photodynamic therapy (PDT), SDT exhibits deep penetration, high cell membrane permeability, and free exposure to light capacity. Unfortunately, owing to inappropriate ultrasound parameter selection, poor targeting of sonosensitizers, and the complex tumor environment, SDT is frequently ineffective. In this review, we describe the approaches for selecting ultrasound parameters and how to develop sonosensitizers to increase targeting and improve adverse tumor microenvironments. Furthermore, the potential of combining SDT with other treatment methods, such as chemotherapy, chemodynamic therapy, photodynamic therapy, photothermal therapy, and immunotherapy, is discussed to further increase the treatment efficiency of SDT.
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Affiliation(s)
- Xiangting Wang
- Zhuhai Institute of Translational Medicine, Department of Ultrasound and Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Tumor Interventional Diagnosis and Treatment, Zhuhai People's Hospital (Zhuhai Hospital Affiliated with Jinan University), The First School of Clinical Medicine of Guangdong Medical University, Zhuhai 519000, China.
| | - Xiaohong Xu
- Department of Ultrasound, Affiliated Hospital of Guangdong Medical University, Zhanjiang 524001, China
| | - Zhe Yang
- Zhuhai Institute of Translational Medicine, Department of Ultrasound and Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Tumor Interventional Diagnosis and Treatment, Zhuhai People's Hospital (Zhuhai Hospital Affiliated with Jinan University), The First School of Clinical Medicine of Guangdong Medical University, Zhuhai 519000, China.
| | - Xuanshou Xu
- Zhuhai Institute of Translational Medicine, Department of Ultrasound and Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Tumor Interventional Diagnosis and Treatment, Zhuhai People's Hospital (Zhuhai Hospital Affiliated with Jinan University), The First School of Clinical Medicine of Guangdong Medical University, Zhuhai 519000, China.
| | - Shisong Han
- Zhuhai Institute of Translational Medicine, Department of Ultrasound and Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Tumor Interventional Diagnosis and Treatment, Zhuhai People's Hospital (Zhuhai Hospital Affiliated with Jinan University), The First School of Clinical Medicine of Guangdong Medical University, Zhuhai 519000, China.
| | - Heng Zhang
- Zhuhai Institute of Translational Medicine, Department of Ultrasound and Department of Endocrinology and Metabolism, Guangdong Provincial Key Laboratory of Tumor Interventional Diagnosis and Treatment, Zhuhai People's Hospital (Zhuhai Hospital Affiliated with Jinan University), The First School of Clinical Medicine of Guangdong Medical University, Zhuhai 519000, China.
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Kuo YY, Chen WT, Lin GB, Lu CH, Chao CY. Study on the effect of a triple cancer treatment of propolis, thermal cycling-hyperthermia, and low-intensity ultrasound on PANC-1 cells. Aging (Albany NY) 2023; 15:7496-7512. [PMID: 37506229 PMCID: PMC10457055 DOI: 10.18632/aging.204916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 07/06/2023] [Indexed: 07/30/2023]
Abstract
To reduce side effects and enhance treatment efficacy, study on combination therapy for pancreatic cancer, a deadly cancer, has gained much attraction in recent years. In this study, we propose a novel triple treatment combining propolis and two physical stimuli-thermal cycling-hyperthermia (TC-HT) and low-intensity ultrasound (US). The study found that, after the triple treatment, the cell viability of a human cancer cell line PANC-1 decreased to a level 80% less than the control, without affecting the normal pancreatic cells. Another result was excessive accumulation of reactive oxygen species (ROS) after the triple treatment, leading to the amplification of apoptotic pathway through the MAPK family and mitochondrial dysfunction. This study, to the best of our knowledge, is the first attempt to combine TC-HT, US, and a natural compound in cancer treatment. The combination of TC-HT and US also promotes the anticancer effect of the heat-sensitive chemotherapy drug cisplatin on PANC-1 cells. It is expected that optimized parameters for different agents and different types of cancer will expand the methodology on oncological therapy in a safe manner.
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Affiliation(s)
- Yu-Yi Kuo
- Department of Physics, Lab for Medical Physics and Biomedical Engineering, National Taiwan University, Taipei, Taiwan
- Molecular Imaging Center, National Taiwan University, Taipei, Taiwan
| | - Wei-Ting Chen
- Department of Physics, Lab for Medical Physics and Biomedical Engineering, National Taiwan University, Taipei, Taiwan
- Molecular Imaging Center, National Taiwan University, Taipei, Taiwan
| | - Guan-Bo Lin
- Department of Physics, Lab for Medical Physics and Biomedical Engineering, National Taiwan University, Taipei, Taiwan
- Molecular Imaging Center, National Taiwan University, Taipei, Taiwan
| | - Chueh-Hsuan Lu
- Department of Physics, Lab for Medical Physics and Biomedical Engineering, National Taiwan University, Taipei, Taiwan
- Molecular Imaging Center, National Taiwan University, Taipei, Taiwan
| | - Chih-Yu Chao
- Department of Physics, Lab for Medical Physics and Biomedical Engineering, National Taiwan University, Taipei, Taiwan
- Molecular Imaging Center, National Taiwan University, Taipei, Taiwan
- Graduate Institute of Applied Physics, Biophysics Division, National Taiwan University, Taipei, Taiwan
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Abstract
With the increasing insight into molecular mechanisms of cardiovascular disease, a promising solution involves directly delivering genes, cells, and chemicals to the infarcted myocardium or impaired endothelium. However, the limited delivery efficiency after administration fails to reach the therapeutic dose and the adverse off-target effect even causes serious safety concerns. Controlled drug release via external stimuli seems to be a promising method to overcome the drawbacks of conventional drug delivery systems (DDSs). Microbubbles and magnetic nanoparticles responding to ultrasound and magnetic fields respectively have been developed as an important component of novel DDSs. In particular, several attempts have also been made for the design and fabrication of dual-responsive DDS. This review presents the recent advances in the ultrasound and magnetic fields responsive DDSs in cardiovascular application, followed by their current problems and future reformation.
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Hsieh CH, Lu CH, Kuo YY, Chen WT, Chao CY. Studies on the non-invasive anticancer remedy of the triple combination of epigallocatechin gallate, pulsed electric field, and ultrasound. PLoS One 2018; 13:e0201920. [PMID: 30080905 PMCID: PMC6078317 DOI: 10.1371/journal.pone.0201920] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 07/24/2018] [Indexed: 12/17/2022] Open
Abstract
Cancer is one of the most troublesome diseases and a leading cause of death worldwide. Recently, novel treatments have been continuously developed to improve the disadvantages of conventional therapies, such as prodigious expenses, unwanted side effects, and tumor recurrence. Here, we provide the first non-invasive treatment that has combined epigallocatechin gallate (EGCG), the most abundant catechin in green tea, with a low strength pulsed electric field (PEF) and a low energy ultrasound (US). It has been observed that the cell viability of human pancreatic cancer PANC-1 was decreased approximately to 20% of the control after this combination treatment for 72 h. Besides, the combined triple treatment significantly reduced the high tolerance of HepG2 cells to the EGCG-induced cytotoxicity and similarly exhibited compelling proliferation-inhibitory effects. We also found the combined triple treatment increased the intracellular reactive oxygen species (ROS) and acidic vesicles, and the EGCG-induced inhibition of Akt phosphorylation was dramatically intensified. In this study, the apoptosis inhibitor Z-VAD-FMK and the autophagy inhibitor 3-MA were, respectively, shown to attenuate the anticancer effects of the triple treatment. This indicates that the triple treatment-induced autophagy was switched from cytoprotective to cytotoxic, and hence, cooperatively caused cell death with the apoptosis. Since the EGCG is easily accessible from the green tea and mild for a long-term treatment, and the non-invasive physical stimulations could be modified to focus on a specific location, this combined triple treatment may serve as a promising strategy for anticancer therapy.
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Affiliation(s)
- Chih-Hsiung Hsieh
- Department of Physics, Lab for Medical Physics & Biomedical Engineering, National Taiwan University, Taipei, Taiwan
- Biomedical & Molecular Imaging Center, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Chueh-Hsuan Lu
- Department of Physics, Lab for Medical Physics & Biomedical Engineering, National Taiwan University, Taipei, Taiwan
- Biomedical & Molecular Imaging Center, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Yu-Yi Kuo
- Department of Physics, Lab for Medical Physics & Biomedical Engineering, National Taiwan University, Taipei, Taiwan
- Biomedical & Molecular Imaging Center, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Wei-Ting Chen
- Department of Physics, Lab for Medical Physics & Biomedical Engineering, National Taiwan University, Taipei, Taiwan
- Biomedical & Molecular Imaging Center, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Chih-Yu Chao
- Department of Physics, Lab for Medical Physics & Biomedical Engineering, National Taiwan University, Taipei, Taiwan
- Biomedical & Molecular Imaging Center, National Taiwan University College of Medicine, Taipei, Taiwan
- Institute of Applied Physics, National Taiwan University, Taipei, Taiwan
- * E-mail:
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Miller DL, Lu X, Fabiilli M, Fields K, Dou C. Frequency Dependence of Petechial Hemorrhage and Cardiomyocyte Injury Induced during Myocardial Contrast Echocardiography. ULTRASOUND IN MEDICINE & BIOLOGY 2016; 42:1929-41. [PMID: 27126240 PMCID: PMC4912900 DOI: 10.1016/j.ultrasmedbio.2016.03.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 03/15/2016] [Accepted: 03/20/2016] [Indexed: 05/24/2023]
Abstract
Myocardial contrast echocardiography (MCE) for perfusion imaging can induce microscale bio-effects during intermittent high-Mechanical Index scans. The dependence of MCE-induced bio-effects on the ultrasonic frequency was examined in rats at 1.6, 2.5 and 3.5 MHz. Premature complexes were counted in the electrocardiogram, petechial hemorrhages with microvascular leakage on the heart surface were observed at the time of exposure, plasma troponin elevation was measured after 4 h and cardiomyocyte injury was detected at 24 h. Increasing response to exposure above an apparent threshold was observed for all endpoints at each frequency. The effects decreased with increasing ultrasonic frequency, and the thresholds increased. Linear regressions for frequency-dependent thresholds indicated coefficients and exponents of 0.6 and 1.07 for petechial hemorrhages, respectively, and 1.02 and 0.8 for cardiomyocyte death, compared with 1.9 and 0.5 (square root) for the guideline limit of the mechanical index. The results clarify the dependence of cardiac bio-effects on frequency, and should allow development of theoretical descriptions of the phenomena and improved safety guidance for MCE.
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Affiliation(s)
- Douglas L Miller
- Department of Radiology, University of Michigan Health System, Ann Arbor, Michigan, USA.
| | - Xiaofang Lu
- Department of Radiology, University of Michigan Health System, Ann Arbor, Michigan, USA
| | - Mario Fabiilli
- Department of Radiology, University of Michigan Health System, Ann Arbor, Michigan, USA
| | - Kristina Fields
- Department of Pathology, University of Michigan Health System, Ann Arbor, Michigan, USA
| | - Chunyan Dou
- Department of Radiology, University of Michigan Health System, Ann Arbor, Michigan, USA
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Miller DL, Dou C, Owens GE, Kripfgans OD. Optimization of ultrasound parameters of myocardial cavitation microlesions for therapeutic application. ULTRASOUND IN MEDICINE & BIOLOGY 2014; 40:1228-36. [PMID: 24613640 PMCID: PMC4011951 DOI: 10.1016/j.ultrasmedbio.2014.01.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Revised: 11/25/2013] [Accepted: 01/02/2014] [Indexed: 05/11/2023]
Abstract
Intermittent high intensity ultrasound scanning with contrast microbubbles can induce scattered cavitation microlesions in the myocardium, which may be of value for tissue reduction therapy. Anesthetized rats were treated in a heated water bath with 1.5 MHz focused ultrasound pulses, guided by an 8 MHz imaging transducer. The relative efficacy with 2 or 4 MPa pulses, 1:4 or 1:8 trigger intervals and 5 or 10 cycle pulses was explored in six groups. Electrocardiogram premature complexes (PCs) induced by the triggered pulse bursts were counted, and Evans blue stained cardiomyocyte scores (SCSs) were obtained. The increase from 2 to 4 MPa produced significant increases in PCs and SCSs and eliminated an anticipated decline in the rate of PC induction with time, which might hinder therapeutic efficacy. Increased intervals and pulse durations did not yield significant increases in the effects. The results suggest that cavitation microlesion production can be refined and potentially lead to a clinically robust therapeutic method.
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Affiliation(s)
- Douglas L Miller
- Department of Radiology, University of Michigan Health System, Ann Arbor, MI, USA.
| | - Chunyan Dou
- Department of Radiology, University of Michigan Health System, Ann Arbor, MI, USA
| | - Gabe E Owens
- Department of Pediatrics, University of Michigan Health System, Ann Arbor, MI, USA
| | - Oliver D Kripfgans
- Department of Radiology, University of Michigan Health System, Ann Arbor, MI, USA
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Yang D, Gao YH, Tan KB, Zuo ZX, Yang WX, Hua X, Li PJ, Zhang Y, Wang G. Inhibition of hepatic fibrosis with artificial microRNA using ultrasound and cationic liposome-bearing microbubbles. Gene Ther 2013; 20:1140-8. [PMID: 23966015 DOI: 10.1038/gt.2013.41] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 06/10/2013] [Accepted: 06/12/2013] [Indexed: 12/17/2022]
Abstract
We sought to investigate the antifibrotic effects of an artificial microRNA (miRNA) targeting connective tissue growth factor (CTGF) using the ultrasound-targeted cationic liposome-bearing microbubble destruction gene delivery system. Cationic liposomes were conjugated with microbubbles using a biotin-avidin system. Plasmids carrying the most effective artificial miRNA sequences were delivered by ultrasound-targeted cationic liposome-bearing microbubble destruction gene delivery system to rats with hepatic fibrosis. The results show that this method of gene delivery effectively transported the plasmids to the rat liver. The artificial miRNA reduced hepatic fibrosis pathological alterations as well as the protein and mRNA expressions of CTGF and transforming growth factor β1. Furthermore, the CTGF gene silencing decreased the levels of type I collagen and α-smooth muscle actin (P<0.01). These data suggest that delivery of an artificial miRNA targeted against CTGF using ultrasound-targeted cationic liposome-bearing microbubble destruction may be an efficacious therapeutic method to ameliorate hepatic fibrosis.
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Affiliation(s)
- D Yang
- 1] Department of Ultrasound, Xinqiao Hospital, The Third Military Medical University, Chongqing, China [2] Department of Ultrasound, 324th Military Hospital, Chongqing, China
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Yang D, Tan KB, Gao YH, Liu H, Yang WX. Effects of diagnostic ultrasound-targeted microbubble destruction on permeability of normal liver in rats. ULTRASONICS 2012; 52:1065-1071. [PMID: 23021237 DOI: 10.1016/j.ultras.2012.09.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2012] [Revised: 08/22/2012] [Accepted: 09/01/2012] [Indexed: 06/01/2023]
Abstract
This work investigated the effect of diagnostic ultrasound-targeted microbubble destruction (UTMD) on the permeability of normal liver tissue and the safety of this technique. One hundred and four rats were divided into four groups: the control group, the microbubble-only (MB) group, the ultrasound-only (US) group, and the ultrasound-targeted microbubble destruction group (UTMD). The permeabilities of capillaries and cell membranes were determined using Evans blue and lanthanum nitrate as tracers, respectively. The amount of Evans blue was approximately fourfold higher in the UTMD group than in the control, MB-only, and US-only groups (all P<0.01). Evans blue extravasation, visualized as red fluorescence, was detectable by laser confocal scanning microscopy in the parenchyma only in the UTMD group. Lanthanum nitrate-tracing transmission electron microscopy examination indicated that intracellular lanthanum was detectable in the cytoplasm only in the UTMD group. Blood chemical analysis indicated that the effect of diagnostic ultrasound-targeted microbubble destruction on the rats' serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels was transient and recoverable and that this technique had no obvious effect on renal function. Cellular swelling was observed in liver cells in the UTMD group at 0.5 h, but this swelling was no longer apparent after 1 week. These results suggest that diagnostic ultrasound-targeted microbubble destruction can increase the capillary and cell membrane permeabilities in normal liver tissue without a significant increase in hepatic and renal toxicity.
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Affiliation(s)
- Dan Yang
- Department of Ultrasound, Xinqiao Hospital, The Third Military Medical University, No. 183 Xinqiao Street, Chongqing 400037, China.
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Kiessling F, Fokong S, Koczera P, Lederle W, Lammers T. Ultrasound microbubbles for molecular diagnosis, therapy, and theranostics. J Nucl Med 2012; 53:345-8. [PMID: 22393225 DOI: 10.2967/jnumed.111.099754] [Citation(s) in RCA: 204] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Ultrasound imaging is clinically established for routine screening examinations of breast, abdomen, neck, and other soft tissues, as well as for therapy monitoring. Microbubbles as vascular contrast agents improve the detection and characterization of cancerous lesions, inflammatory processes, and cardiovascular pathologies. Taking advantage of the excellent sensitivity and specificity of ultrasound for microbubble detection, molecular imaging can be realized by binding antibodies, peptides, and other targeting moieties to microbubble surfaces. Molecular microbubbles directed against various targets such as vascular endothelial growth factor receptor-2, vascular cell adhesion molecule 1, intercellular adhesion molecule 1, selectins, and integrins were developed and were shown in preclinical studies to be able to selectively bind to tumor blood vessels and atherosclerotic plaques. Currently, the first microbubble formulations targeted to angiogenic vessels in prostate cancers are being evaluated clinically. However, microbubbles can be used for more than diagnosis: disintegrating microbubbles emit acoustic forces that are strong enough to induce thrombolysis, and they can also be used for facilitating drug and gene delivery across biologic barriers. This review on the use of microbubbles for ultrasound-based molecular imaging, therapy, and theranostics addresses innovative concepts and identifies areas in which clinical translation is foreseeable in the near future.
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Affiliation(s)
- Fabian Kiessling
- Department of Experimental Molecular Imaging, RWTH-Aachen University, Aachen, Germany.
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Chen ZY, Liang K, Qiu RX, Luo LP. Ultrasound- and liposome microbubble-mediated targeted gene transfer to cardiomyocytes in vivo accompanied by polyethylenimine. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2011; 30:1247-1258. [PMID: 21876096 DOI: 10.7863/jum.2011.30.9.1247] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
OBJECTIVES Gene transfer to cardiomyocytes in vivo has received much research attention in the last decade but remains a substantial hurdle. Gene transfer using ultrasound-targeted microbubble destruction is a promising tool for gene therapy. Little data have shown the feasibility and optimization of this method for primary myocardial disease. In this study, we sought to determine the feasibility and efficiency of in vivo gene transfer to the myocardium mediated by ultrasound-targeted microbubble destruction accompanied by polyethylenimine. METHODS Three plasmids (luciferase reporter, red fluorescent protein reporter, and enhanced green fluorescent protein reporter) were used in this study. The ultrasound parameters were also optimized. A solution containing phosphate-buffered saline, a plasmid, plasmid complex, or polyethylenimine/plasmid, and liposome microbubbles was injected via a tail vein with (study) or without (control) transthoracic ultrasound irradiation. The efficiency of reporter gene transfer was determined by detection of luciferase activity or microscopy, and histologic investigations of the tissue specimens were performed. RESULTS Ultrasound-targeted microbubble destruction significantly increased luciferase activity in vivo compared to plasmids and microbubbles alone (P < .001). More importantly, the increase in transgene expression was significantly related to ultrasound-targeted microbubble destruction in the presence of polyethylenimine (P < .001). In addition, fluorescein expression was present in all sections that received ultrasound-targeted microbubble destruction. The fluorescent reporter genes and luciferase plasmid all had similar results. Regardless of ultrasound exposure, expression in other organs was close to a background level except for the liver and lung. Hematoxylin-eosin staining showed no notable myocardial injury or death in control and treated mice. CONCLUSIONS An atraumatic targeted gene delivery technique based on ultrasound-targeted microbubble destruction and polyethylenimine has been developed to transfect cardiomyocytes in vivo. If a suitable target gene is added, the novel technique could be highly effective in many kinds of heart disease.
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Affiliation(s)
- Zhi-Yi Chen
- Department of Medical Imaging Center, First Affiliated Hospital, Jinan University, 613 Huangpu Dadao Xi, 510632 Guangzhou, Guangdong, China
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11
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Walton CB, Anderson CD, Boulay R, Shohet RV. Introduction to the ultrasound targeted microbubble destruction technique. J Vis Exp 2011:2963. [PMID: 21694693 DOI: 10.3791/2963] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
In UTMD, bioactive molecules, such as negatively charged plasmid DNA vectors encoding a gene of interest, are added to the cationic shells of lipid microbubble contrast agents. In mice these vector-carrying microbubbles can be administered intravenously or directly to the left ventricle of the heart. In larger animals they can also be infused through an intracoronary catheter. The subsequent delivery from the circulation to a target organ occurs by acoustic cavitation at a resonant frequency of the microbubbles. It seems likely that the mechanical energy generated by the microbubble destruction results in transient pore formation in or between the endothelial cells of the microvasculature of the targeted region. As a result of this sonoporation effect, the transfection efficiency into and across the endothelial cells is enhanced, and transgene-encoding vectors are deposited into the surrounding tissue. Plasmid DNA remaining in the circulation is rapidly degraded by nucleases in the blood, which further reduces the likelihood of delivery to non-sonicated tissues and leads to highly specific target-organ transfection.
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Affiliation(s)
- Chad B Walton
- Department of Medicine, JABSOM, University of Hawaii, USA
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Miller DL, Dou C, Lucchesi BR. Are ECG premature complexes induced by ultrasonic cavitation electrophysiological responses to irreversible cardiomyocyte injury? ULTRASOUND IN MEDICINE & BIOLOGY 2011; 37:312-20. [PMID: 21257092 PMCID: PMC3046393 DOI: 10.1016/j.ultrasmedbio.2010.11.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2010] [Revised: 11/10/2010] [Accepted: 11/23/2010] [Indexed: 05/03/2023]
Abstract
The objective of this study was to explore the relationship between premature complexes (PCs) in the electrocardiogram (ECG) and lethal injury of cardiomyocytes induced by ultrasound exposure of the heart with contrast-agent gas bodies in the circulation. Anesthetized rats were exposed in a heated water bath to 1.55 MHz focused ultrasound with bursts triggered at end systole during contrast agent infusion. PCs were detected in ECG recordings and cardiomyocyte necrosis was scored by identifying Evans blue-stained cells in multiple frozen sections. With 0.1 μL/kg/min infusion of contrast agent for 5 min, both effects increased strongly for 2-ms bursts with increasing peak rarefactional pressure amplitude >1 MPa. At 8 MPa, statistically significant effects were found even for no agent infusion relative to sham tests. For 2-ms bursts at 2 MPa, the highly significant bioeffects seen for 10-, 1- and 0.1-μL/kg/min infusion became marginally significant for 0.01 μL/kg/min, which indicated a lower probability of cavitation nucleation. Burst duration variation from 0.2-20 ms produced no substantial trends in the results. Overall, the two effects were well correlated (r(2) = 0.88). The PCs occurring during contrast-enhanced ultrasound therefore appear to be electrophysiological responses to irreversible cardiomyocyte injury induced by ultrasonic cavitation.
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Affiliation(s)
- Douglas L Miller
- Department of Radiology, University of Michigan, Ann Arbor, MI 48109-5667, USA.
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Shklyar TF, Toropova OA, Safronov AP, Leiman DV, Kotov YA, Blyakhman FA. Acoustic properties of metal oxides aqueous suspensions. ACTA ACUST UNITED AC 2010. [DOI: 10.1134/s1995078010030110] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Hernot S, Cosyns B, Droogmans S, Garbar C, Couck P, Vanhove C, Caveliers V, Van Camp G, Bossuyt A, Lahoutte T. Effect of high-intensity ultrasound-targeted microbubble destruction on perfusion and function of the rat heart assessed by pinhole-gated SPECT. ULTRASOUND IN MEDICINE & BIOLOGY 2010; 36:158-165. [PMID: 19931973 DOI: 10.1016/j.ultrasmedbio.2009.08.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2009] [Revised: 08/11/2009] [Accepted: 08/19/2009] [Indexed: 05/28/2023]
Abstract
Although ultrasound-targeted microbubble destruction (UTMD) has been shown to induce bioeffects, UTMD is still desirable for therapeutic applications. Therefore, we studied the effects of UTMD on perfusion and function of the rat heart, assessed by (99m)Tc-MIBI pinhole-gated SPECT (Ph-gSPECT) compared with biomarker release and histopathology. Fifty-two male Wistar rats were studied. UTMD was performed using SonoVue, with a mechanical index of 1.0 or 1.6. Controls were treated without microbubbles or without ultrasound application. At baseline, day 1, day 7 and day 30, 35 rats were imaged with (99m)Tc-MIBI Ph-gSPECT to quantify left ventricular perfusion and function. In addition, troponin release and histopathology were investigated. No significant differences were observed for left ventricular ejection fractions, end-systolic and end-diastolic volumes, regional perfusion and functional scores up to 30 days after UTMD compared with controls. UTMD induced mild troponin release and early erythrocyte extravasation without necrosis, inflammation or fibrosis. Although UTMD has the potential to induce microlesions of the heart in small animals, these effects were transient without histological evidence of irreversible damage. Furthermore, UTMD does not induce abnormalities on perfusion or function of the heart, as assessed by Ph-gSPECT, which is reassuring concerning the use of SonoVue for potential therapeutic applications. (E-mail: sophie.hernot@gmail.com).
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Affiliation(s)
- Sophie Hernot
- ICMI, Vrije Universiteit Brussel, UZ Brussel, Brussels, Belgium.
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