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Yin X, Harmancey R, Frierson B, Wu JG, Moody MR, McPherson DD, Huang SL. Efficient Gene Editing for Heart Disease via ELIP-Based CRISPR Delivery System. Pharmaceutics 2024; 16:343. [PMID: 38543237 PMCID: PMC10974117 DOI: 10.3390/pharmaceutics16030343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Revised: 02/09/2024] [Accepted: 02/26/2024] [Indexed: 04/01/2024] Open
Abstract
Liposomes as carriers for CRISPR/Cas9 complexes represent an attractive approach for cardiovascular gene therapy. A critical barrier to this approach remains the efficient delivery of CRISPR-based genetic materials into cardiomyocytes. Echogenic liposomes (ELIP) containing a fluorescein isothiocyanate-labeled decoy oligodeoxynucleotide against nuclear factor kappa B (ELIP-NF-κB-FITC) were used both in vitro on mouse neonatal ventricular myocytes and in vivo on rat hearts to assess gene delivery efficacy with or without ultrasound. In vitro analysis was then repeated with ELIP containing Cas9-sg-IL1RL1 (interleukin 1 receptor-like 1) RNA to determine the efficiency of gene knockdown. ELIP-NF-κB-FITC without ultrasound showed limited gene delivery in vitro and in vivo, but ultrasound combined with ELIP notably improved penetration into heart cells and tissues. When ELIP was used to deliver Cas9-sg-IL1RL1 RNA, gene editing was successful and enhanced by ultrasound. This innovative approach shows promise for heart disease gene therapy using CRISPR technology.
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Affiliation(s)
- Xing Yin
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (R.H.); (B.F.); (M.R.M.); (D.D.M.)
| | - Romain Harmancey
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (R.H.); (B.F.); (M.R.M.); (D.D.M.)
| | - Brion Frierson
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (R.H.); (B.F.); (M.R.M.); (D.D.M.)
| | - Jean G. Wu
- Department of Diagnostic Sciences, The University of Texas Health Science Center at Houston, Houston, TX 77054, USA;
| | - Melanie R. Moody
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (R.H.); (B.F.); (M.R.M.); (D.D.M.)
| | - David D. McPherson
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (R.H.); (B.F.); (M.R.M.); (D.D.M.)
| | - Shao-Ling Huang
- Division of Cardiology, Department of Internal Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (R.H.); (B.F.); (M.R.M.); (D.D.M.)
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2
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Karpinecz B, Edwards N, Zderic V. Therapeutic Ultrasound-Enhanced Transcorneal PHMB Delivery In Vitro. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2021; 40:2561-2570. [PMID: 33491798 DOI: 10.1002/jum.15641] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 01/07/2021] [Accepted: 01/09/2021] [Indexed: 06/12/2023]
Abstract
OBJECTIVE Delivery of therapeutic agents to the cornea is a difficult task in the treatment of parasitic keratitis. In this study, we looked at using different combinations of ultrasound parameters to enhance corneal permeability to polyhexamethylene biguanide (PHMB), a clinically available ophthalmic antiparasitic formulation. METHODS Permeability of PHMB was investigated in vitro using a standard diffusion cell setup. Continuous or 25% duty-cycle ultrasound was used at frequencies of 400 or 600 kHz, intensities of 0.5 or 0.8 W/cm2 , and exposure times ranging from 1 to 5 minutes. Structural changes in the cornea were examined using light microscopy. RESULTS Ultrasound exposure produced increases in transcorneal delivery in every treatment parameter combination when compared to the sham treatment. The highest increase was 2.36 times for 5 minutes of continuous ultrasound at a frequency of 600 kHz and an intensity of 0.5 W/cm2 with statistical significance (p <.001). Histological analysis showed that ultrasound application only caused structural changes in the corneal epithelium, with most damage being at the surface layers. CONCLUSIONS This study suggests the possibility of therapeutic ultrasound as a novel drug delivery technique for the treatment of parasitic keratitis. Further studies are needed to examine the thermal effects of these proposed ultrasound applications and the long-term viability of this treatment.
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Affiliation(s)
- Bianca Karpinecz
- Department of Biomedical Engineering, The George Washington University, Washington, District of Columbia, USA
| | - Natalie Edwards
- Department of Biomedical Engineering, The George Washington University, Washington, District of Columbia, USA
| | - Vesna Zderic
- Department of Biomedical Engineering, The George Washington University, Washington, District of Columbia, USA
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Walsh AP, Gordon HN, Peter K, Wang X. Ultrasonic particles: An approach for targeted gene delivery. Adv Drug Deliv Rev 2021; 179:113998. [PMID: 34662671 PMCID: PMC8518240 DOI: 10.1016/j.addr.2021.113998] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 09/24/2021] [Accepted: 10/05/2021] [Indexed: 02/07/2023]
Abstract
Gene therapy has been widely investigated for the treatment of genetic, acquired, and infectious diseases. Pioneering work utilized viral vectors; however, these are suspected of causing serious adverse events, resulting in the termination of several clinical trials. Non-viral vectors, such as lipid nanoparticles, have attracted significant interest, mainly due to their successful use in vaccines in the current COVID-19 pandemic. Although they allow safe delivery, they come with the disadvantage of off-target delivery. The application of ultrasound to ultrasound-sensitive particles allows for a direct, site-specific transfer of genetic materials into the organ/site of interest. This process, termed ultrasound-targeted gene delivery (UTGD), also increases cell membrane permeability and enhances gene uptake. This review focuses on the advances in ultrasound and the development of ultrasonic particles for UTGD across a range of diseases. Furthermore, we discuss the limitations and future perspectives of UTGD.
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Affiliation(s)
- Aidan P.G. Walsh
- Molecular Imaging and Theranostics Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia,Atherothrombosis and Vascular Biology Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia,Department of Medicine, Monash University, Melbourne, VIC, Australia
| | - Henry N. Gordon
- Molecular Imaging and Theranostics Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia,Atherothrombosis and Vascular Biology Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia,Department of Biochemistry and Pharmacology, University of Melbourne, VIC, Australia
| | - Karlheinz Peter
- Atherothrombosis and Vascular Biology Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia,Department of Medicine, Monash University, Melbourne, VIC, Australia,Department of Cardiometabolic Health, University of Melbourne, VIC, Australia,La Trobe Institute for Molecular Science, La Trobe University, Melbourne, VIC, Australia
| | - Xiaowei Wang
- Molecular Imaging and Theranostics Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia,Atherothrombosis and Vascular Biology Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia,Department of Medicine, Monash University, Melbourne, VIC, Australia,Department of Cardiometabolic Health, University of Melbourne, VIC, Australia,La Trobe Institute for Molecular Science, La Trobe University, Melbourne, VIC, Australia,Corresponding author at: Baker Heart and Diabetes Institute, 75 Commercial Road, Melbourne, VIC 3004, Australia
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Rousou C, Schuurmans CCL, Urtti A, Mastrobattista E, Storm G, Moonen C, Kaarniranta K, Deckers R. Ultrasound and Microbubbles for the Treatment of Ocular Diseases: From Preclinical Research towards Clinical Application. Pharmaceutics 2021; 13:pharmaceutics13111782. [PMID: 34834196 PMCID: PMC8624665 DOI: 10.3390/pharmaceutics13111782] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 10/08/2021] [Accepted: 10/09/2021] [Indexed: 12/26/2022] Open
Abstract
The unique anatomy of the eye and the presence of various biological barriers make efficacious ocular drug delivery challenging, particularly in the treatment of posterior eye diseases. This review focuses on the combination of ultrasound and microbubbles (USMB) as a minimally invasive method to improve the efficacy and targeting of ocular drug delivery. An extensive overview is given of the in vitro and in vivo studies investigating the mechanical effects of ultrasound-driven microbubbles aiming to: (i) temporarily disrupt the blood–retina barrier in order to enhance the delivery of systemically administered drugs into the eye, (ii) induce intracellular uptake of anticancer drugs and macromolecules and (iii) achieve targeted delivery of genes, for the treatment of ocular malignancies and degenerative diseases. Finally, the safety and tolerability aspects of USMB, essential for the translation of USMB to the clinic, are discussed.
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Affiliation(s)
- Charis Rousou
- Departments of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Heidelberglaan 8, 3584 CS Utrecht, The Netherlands; (C.C.L.S.); (E.M.); (G.S.)
- Division of Imaging and Oncology, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands; (C.M.); (R.D.)
- Correspondence:
| | - Carl C. L. Schuurmans
- Departments of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Heidelberglaan 8, 3584 CS Utrecht, The Netherlands; (C.C.L.S.); (E.M.); (G.S.)
- Department of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Heidelberglaan 8, 3584 CS Utrecht, The Netherlands
| | - Arto Urtti
- School of Pharmacy, Faculty of Health Sciences, University of Eastern Finland, 70210 Kuopio, Finland;
- Division of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, P.O. Box 56, 00014 Helsinki, Finland
- Institute of Chemistry, St. Petersburg State University, Universitetskii Pr. 26, Petrodvorets, 198504 St. Petersburg, Russia
| | - Enrico Mastrobattista
- Departments of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Heidelberglaan 8, 3584 CS Utrecht, The Netherlands; (C.C.L.S.); (E.M.); (G.S.)
| | - Gert Storm
- Departments of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Heidelberglaan 8, 3584 CS Utrecht, The Netherlands; (C.C.L.S.); (E.M.); (G.S.)
- Department of Biomaterials Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119228, Singapore
| | - Chrit Moonen
- Division of Imaging and Oncology, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands; (C.M.); (R.D.)
| | - Kai Kaarniranta
- Department of Ophthalmology, Kuopio University Hospital, P.O. Box 100, 70029 Kuopio, Finland;
- Department of Ophthalmology, Institute of Clinical Medicine, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland
| | - Roel Deckers
- Division of Imaging and Oncology, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands; (C.M.); (R.D.)
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5
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Huang D, Chen YS, Rupenthal ID. Overcoming ocular drug delivery barriers through the use of physical forces. Adv Drug Deliv Rev 2018; 126:96-112. [PMID: 28916492 DOI: 10.1016/j.addr.2017.09.008] [Citation(s) in RCA: 111] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 06/30/2017] [Accepted: 09/08/2017] [Indexed: 12/25/2022]
Abstract
Overcoming the physiological barriers in the eye remains a key obstacle in the field of ocular drug delivery. While ocular barriers naturally have a protective function, they also limit drug entry into the eye. Various pharmaceutical strategies, such as novel formulations and physical force-based techniques, have been investigated to weaken these barriers and transport therapeutic agents effectively to both the anterior and the posterior segments of the eye. This review summarizes and discusses the recent research progress in the field of ocular drug delivery with a focus on the application of physical methods, including electrical fields, sonophoresis, and microneedles, which can enhance penetration efficiency by transiently disrupting the ocular barriers in a minimally or non-invasive manner.
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6
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Saraiva SM, Castro-López V, Pañeda C, Alonso MJ. Synthetic nanocarriers for the delivery of polynucleotides to the eye. Eur J Pharm Sci 2017; 103:5-18. [PMID: 28263915 DOI: 10.1016/j.ejps.2017.03.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Revised: 02/28/2017] [Accepted: 03/01/2017] [Indexed: 02/07/2023]
Abstract
This review is a comprehensive analysis of the progress made so far on the delivery of polynucleotide-based therapeutics to the eye, using synthetic nanocarriers. Attention has been addressed to the capacity of different nanocarriers for the specific delivery of polynucleotides to both, the anterior and posterior segments of the eye, with emphasis on their ability to (i) improve the transport of polynucleotides across the different eye barriers; (ii) promote their intracellular penetration into the target cells; (iii) protect them against degradation and, (iv) deliver them in a long-term fashion way. Overall, the conclusion is that despite the advantages that nanotechnology may offer to the area of ocular polynucleotide-based therapies (especially AS-ODN and siRNA delivery), the knowledge disclosed so far is still limited. This fact underlines the necessity of more fundamental and product-oriented research for making the way of the said nanotherapies towards clinical translation.
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Affiliation(s)
- Sofia M Saraiva
- Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), Av. Barcelona s/n, Campus Vida, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - Vanessa Castro-López
- Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), Av. Barcelona s/n, Campus Vida, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - Covadonga Pañeda
- Sylentis, R&D Department, c/Santiago Grisolía 2, 28760 Tres Cantos, Madrid, Spain
| | - María José Alonso
- Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), Av. Barcelona s/n, Campus Vida, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain; Department of Pharmacy and Pharmaceutical Technology, School of Pharmacy, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain; Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain.
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7
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Negishi Y, Endo-Takahashi Y, Maruyama K. Gene delivery systems by the combination of lipid bubbles and ultrasound. Drug Discov Ther 2016; 10:248-255. [PMID: 27795481 DOI: 10.5582/ddt.2016.01063] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Gene therapy is promising for the treatment of many diseases including cancers and genetic diseases. From the viewpoint of safety, ultrasound (US)-mediated gene delivery with nano/ microbubbles was recently developed as a novel non-viral vector system. US-mediated gene delivery using nano/microbubbles are able to produce transient changes in the permeability of the cell membrane after US-induced cavitation while reducing cellular damage and enables the tissue-specific or the site-specific intracellular delivery of gene both in vitro and in vivo. We have recently developed novel lipid nanobubbles (Lipid Bubbles). These nanobubbles can also be used to enhance the efficacy of the US-mediated genes (plasmid DNA, siRNA, and miRNA etc.) delivery. In this review, we describe US-mediated delivery systems combined with nano/microbubbles and discuss their feasibility as non-viral vector systems.
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Affiliation(s)
- Yoichi Negishi
- Department of Drug Delivery and Molecular Biopharmaceutics, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences
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8
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Lafond M, Aptel F, Mestas JL, Lafon C. Ultrasound-mediated ocular delivery of therapeutic agents: a review. Expert Opin Drug Deliv 2016; 14:539-550. [DOI: 10.1080/17425247.2016.1198766] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Maxime Lafond
- Inserm, LabTAU, Lyon, France
- Univ Lyon, Université Lyon 1, Lyon, France
| | - Florent Aptel
- Department of Ophthalmology, University Hospital of Grenoble, Université Grenoble Alpes, Grenoble, France
| | - Jean-Louis Mestas
- Inserm, LabTAU, Lyon, France
- Univ Lyon, Université Lyon 1, Lyon, France
| | - Cyril Lafon
- Inserm, LabTAU, Lyon, France
- Univ Lyon, Université Lyon 1, Lyon, France
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9
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Wan C, Li F, Li H. Gene therapy for ocular diseases meditated by ultrasound and microbubbles (Review). Mol Med Rep 2015; 12:4803-14. [PMID: 26151686 PMCID: PMC4581786 DOI: 10.3892/mmr.2015.4054] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 06/03/2015] [Indexed: 02/06/2023] Open
Abstract
The eye is an ideal target organ for gene therapy as it is easily accessible and immune‑privileged. With the increasing insight into the underlying molecular mechanisms of ocular diseases, gene therapy has been proposed as an effective approach. Successful gene therapy depends on efficient gene transfer to targeted cells to prove stable and prolonged gene expression with minimal toxicity. At present, the main hindrance regarding the clinical application of gene therapy is not the lack of an ideal gene, but rather the lack of a safe and efficient method to selectively deliver genes to target cells and tissues. Ultrasound‑targeted microbubble destruction (UTMD), with the advantages of high safety, repetitive applicability and tissue targeting, has become a potential strategy for gene‑ and drug delivery. When gene‑loaded microbubbles are injected, UTMD is able to enhance the transport of the gene to the targeted cells. High‑amplitude oscillations of microbubbles act as cavitation nuclei which can effectively focus ultrasound energy, produce oscillations and disruptions that increase the permeability of the cell membrane and create transient pores in the cell membrane. Thereby, the efficiency of gene therapy can be significantly improved. The UTMD‑mediated gene delivery system has been widely used in pre‑clinical studies to enhance gene expression in a site‑specific manner in a variety of organs. With reasonable application, the effects of sonoporation can be spatially and temporally controlled to improve localized tissue deposition of gene complexes for ocular gene therapy applications. In addition, appropriately powered, focused ultrasound combined with microbubbles can induce a reversible disruption of the blood‑retinal barrier with no significant side effects. The present review discusses the current status of gene therapy of ocular diseases as well as studies on gene therapy of ocular diseases meditated by UTMD.
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Affiliation(s)
- Caifeng Wan
- Department of Ultrasound, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, P.R. China
| | - Fenghua Li
- Department of Ultrasound, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, P.R. China
| | - Hongli Li
- Department of Ultrasound, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, P.R. China
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10
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Omata D, Negishi Y, Suzuki R, Oda Y, Endo-Takahashi Y, Maruyama K. Nonviral gene delivery systems by the combination of bubble liposomes and ultrasound. ADVANCES IN GENETICS 2014; 89:25-48. [PMID: 25620007 DOI: 10.1016/bs.adgen.2014.11.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The combination of therapeutic ultrasound (US) and nano/microbubbles is an important system for establishing a novel and noninvasive gene delivery system. Genes are delivered more efficiently using this system compared with a conventional nonviral vector system such as the lipofection method, resulting in higher gene expression. This higher efficiency is due to the gene being delivered into the cytosol and bypassing the endocytosis pathway. Many in vivo studies have demonstrated US-mediated gene delivery with nano/microbubbles, and several gene therapy feasibility studies for various diseases have been reported. In addition, nano/microbubbles can deliver genes site specifically by the control of US exposure site. In the present review, we summarize the gene delivery systems by the combination of nano/microbubbles and US, describe their properties, and assess applications and challenges of US theranostics.
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Affiliation(s)
- Daiki Omata
- Department of Drug and Gene Delivery Research, Faculty of Pharma-Sciences, Teikyo University, Itabashi, Tokyo, Japan
| | - Yoichi Negishi
- Department of Drug Delivery and Molecular Biopharmaceutics, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan
| | - Ryo Suzuki
- Department of Drug and Gene Delivery Research, Faculty of Pharma-Sciences, Teikyo University, Itabashi, Tokyo, Japan
| | - Yusuke Oda
- Department of Drug and Gene Delivery Research, Faculty of Pharma-Sciences, Teikyo University, Itabashi, Tokyo, Japan
| | - Yoko Endo-Takahashi
- Department of Drug Delivery and Molecular Biopharmaceutics, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan
| | - Kazuo Maruyama
- Department of Drug and Gene Delivery Research, Faculty of Pharma-Sciences, Teikyo University, Itabashi, Tokyo, Japan
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11
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Husseini GA, Pitt WG, Martins AM. Ultrasonically triggered drug delivery: breaking the barrier. Colloids Surf B Biointerfaces 2014; 123:364-86. [PMID: 25454759 DOI: 10.1016/j.colsurfb.2014.07.051] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Revised: 07/23/2014] [Accepted: 07/24/2014] [Indexed: 12/21/2022]
Abstract
The adverse side-effects of chemotherapy can be minimized by delivering the therapeutics in time and space to only the desired target site. Ultrasound offers one fairly non-invasive method of accomplishing such precise delivery because its energy can disrupt nanosized containers that are designed to sequester the drug until the ultrasonic event. Such containers include micelles, liposomes and solid nanoparticles. Conventional micelles and liposomes are less acoustically sensitive to ultrasound because the strongest forces associated with ultrasound are generated by gas-liquid interfaces, which both of these conventional constructs lack. Acoustically activated carriers often incorporate a gas phase, either actively as preformed bubbles, or passively such as taking advantage of dissolved gasses that form bubbles upon insonation. Newer concepts include using liquids that form gas when insonated. This review focuses on the ultrasonically activated delivery of therapeutics from micelles, liposomes and solid particles. In vitro and in vivo results are summarized and discussed. Novel structural concepts from micelles and liposomes are presented. Mechanisms of ultrasonically activated release are discussed. The future of ultrasound in drug delivery is envisioned.
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Affiliation(s)
| | | | - Ana M Martins
- American University of Sharjah, Sharjah, United Arab Emirates
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12
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Agarwal R, Iezhitsa I, Agarwal P, Abdul Nasir NA, Razali N, Alyautdin R, Ismail NM. Liposomes in topical ophthalmic drug delivery: an update. Drug Deliv 2014; 23:1075-91. [DOI: 10.3109/10717544.2014.943336] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Affiliation(s)
- Renu Agarwal
- Faculty of Medicine, Universiti Teknologi MARA, Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia,
- Brain & Neuroscience, Communities of Research (Core), Research Management Institute (RMI), Universiti Teknologi MARA, Shah Alam, Selangor Darul Ehsan, Malaysia,
| | - Igor Iezhitsa
- Faculty of Medicine, Universiti Teknologi MARA, Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia,
- Brain & Neuroscience, Communities of Research (Core), Research Management Institute (RMI), Universiti Teknologi MARA, Shah Alam, Selangor Darul Ehsan, Malaysia,
- Research Institute of Pharmacology, Volgograd State Medical University, Volgograd, Russian Federation, and
| | - Puneet Agarwal
- Department of Ophthalmology, IMU Clinical School, International Medical University, Jalan Rasah, Seremban, Malaysia
| | - Nurul Alimah Abdul Nasir
- Faculty of Medicine, Universiti Teknologi MARA, Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia,
- Brain & Neuroscience, Communities of Research (Core), Research Management Institute (RMI), Universiti Teknologi MARA, Shah Alam, Selangor Darul Ehsan, Malaysia,
| | - Norhafiza Razali
- Faculty of Medicine, Universiti Teknologi MARA, Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia,
- Brain & Neuroscience, Communities of Research (Core), Research Management Institute (RMI), Universiti Teknologi MARA, Shah Alam, Selangor Darul Ehsan, Malaysia,
| | - Renad Alyautdin
- Faculty of Medicine, Universiti Teknologi MARA, Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia,
| | - Nafeeza Mohd Ismail
- Faculty of Medicine, Universiti Teknologi MARA, Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia,
- Brain & Neuroscience, Communities of Research (Core), Research Management Institute (RMI), Universiti Teknologi MARA, Shah Alam, Selangor Darul Ehsan, Malaysia,
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13
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Sonoda S, Yamashita T, Suzuki R, Maruyama K, Sakamoto T. [Application of ultrasound-enhanced gene and drug delivery to the ocular tissue]. YAKUGAKU ZASSHI 2013; 133:1269-76. [PMID: 24292171 DOI: 10.1248/yakushi.13-00222-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Visual images provide an immensely rich source of information about the external world. Eye has characteristic structure sensory cells are arranged along the eye wall, and is filled inside with vitreous body. In recent years, intravitreal injection of anti-vascular endothelial growth factor (VEGF) agent had widely spread, and numerous number of patients who suffered ocular angiogenic disease such as diabetic retinopathy, age-related macular degeneration and retinal vascular occlusion for the disease, were treated and spared the blindness. Vitreous cavity was regarded as reservoir of drug, intravitreal injection is thought a sort of drug delivery. However, with regard to the administration of a selective drug deliver, it has not yet been solved. Our aim is to establish a new method of gene transfer, drug delivery using low-energy ultrasound to the eye, to date, we confirmed drug and gene deliver to the ocular tissue such as cornea, conjunctiva and retina with high efficiency. In addition, tissue damage was minimal. We have also shown that ultrasound irradiation with combination of a microbubbles or bubble liposome could be introduced drug and gene more effectively. Based on these knowledge, we will focus on development of a new device for intraocular ultrasound exposure and potential for therapeutic application of ultrasound to humans retinal disease such as retinal artery obstruction.
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Affiliation(s)
- Shozo Sonoda
- Department of Ophthalmology, Kagoshima University Graduate School of Medical and Dental Sciences
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Abstract
Penetrating keratoplasty is the most common type of tissue transplant in humans. Irreversible immune rejection leads to loss of vision and graft failure. This complex immune response further predisposes future corneal transplants to rejection and failure. A diverse armamentarium of surgical and pharmacologic tools is available to improve graft survival. In this review, we will discuss the various gene therapeutic strategies aimed at potentiating the anterior chamber-associated immune deviation to extend graft survival.
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Affiliation(s)
- Pho Nguyen
- The Doheny Eye Institute, Keck School of Medicine of the University of Southern California, Los Angeles, California, USA
| | - Samuel C. Yiu
- The Wilmer Eye Institute, Baltimore, Maryland, USA, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia
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Targeting herpetic keratitis by gene therapy. J Ophthalmol 2012; 2012:594869. [PMID: 23326647 PMCID: PMC3541562 DOI: 10.1155/2012/594869] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Accepted: 11/30/2012] [Indexed: 01/15/2023] Open
Abstract
Ocular gene therapy is rapidly becoming a reality. By November 2012, approximately 28 clinical trials were approved to assess novel gene therapy agents. Viral infections such as herpetic keratitis caused by herpes simplex virus 1 (HSV-1) can cause serious complications that may lead to blindness. Recurrence of the disease is likely and cornea transplantation, therefore, might not be the ideal therapeutic solution. This paper will focus on the current situation of ocular gene therapy research against herpetic keratitis, including the use of viral and nonviral vectors, routes of delivery of therapeutic genes, new techniques, and key research strategies. Whereas the correction of inherited diseases was the initial goal of the field of gene therapy, here we discuss transgene expression, gene replacement, silencing, or clipping. Gene therapy of herpetic keratitis previously reported in the literature is screened emphasizing candidate gene therapy targets. Commonly adopted strategies are discussed to assess the relative advantages of the protective therapy using antiviral drugs and the common gene therapy against long-term HSV-1 ocular infections signs, inflammation and neovascularization. Successful gene therapy can provide innovative physiological and pharmaceutical solutions against herpetic keratitis.
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Alzaraa A, Gravante G, Chung WY, Al-Leswas D, Bruno M, Dennison AR, Lloyd DM. Targeted microbubbles in the experimental and clinical setting. Am J Surg 2012; 204:355-66. [PMID: 22920405 DOI: 10.1016/j.amjsurg.2011.10.024] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Revised: 10/12/2011] [Accepted: 10/12/2011] [Indexed: 01/17/2023]
Abstract
BACKGROUND Microbubbles have improved ultrasonography imaging techniques over the past 2 decades. Their safety, versatility, and easiness of use have rendered them equal or even superior in some instances to other imaging modalities such as computed tomography and magnetic resonance imaging. Herein, we conducted a literature review to present their types, general behavior in tissues, and current and potential use in clinical practice. METHODS A literature search was conducted for all preclinical and clinical studies involving microbubbles and ultrasonography. RESULTS Different types of microbubbles are available. These generally improve the enhancement of tissues during ultrasonography imaging. They also can be attached to ligands for the target of several conditions such as inflammation, angiogenesis, thrombosis, apoptosis, and might have the potential of carrying toxic drugs to diseased sites, thereby limiting the systemic adverse effects. CONCLUSIONS The use of microbubbles is evolving rapidly and can have a significant impact on the management of various conditions. The potential for their use as targeting agents and gene and drug delivery vehicles looks promising.
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Affiliation(s)
- Ahmed Alzaraa
- Department of Hepatobiliary and Pancreatic Surgery, NHS Trust, Leicester General Hospital, Gwendolen Rd., Leicester, LE5 4PW, UK.
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17
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Abstract
Therapeutic ultrasound, although less well known than ultrasound for diagnostic imaging, has become a topic of growing interest in ophthalmology. High intensity focused ultrasound (HIFU) for the treatment of glaucoma and ultrasonic drug delivery are the two main areas of research and potential clinical applications. For the treatment of glaucoma, the specific advantage of HIFU, particularly when compared to the laser, is that the energy can be focused through optically opaque media, especially through the sclera which is a strongly light-scattering medium. HIFU is therefore a possible method for partial coagulation of the ciliary body (an anatomical structure responsible for the production of the liquid filling the eye) and, hence, reducing intraocular pressure and the risk of glaucoma. Ocular drug bioavailability also remains a challenge, being limited by multiple barriers to drug entry and lacrimal drainage, and making it difficult to achieve a sufficient drug concentration for numerous diseases of the front and back of the eye. As the front wall of the eye (cornea and anterior sclera) is a pathway for topically applied drugs, locally applied ultrasound has been proposed as a way of enhancing the delivery and activity of drugs and genes. Despite the fact that experimental studies seem to confirm the potential benefit of ultrasound ocular drug delivery, there is still a lack of clinical evidence. The aim of this contribution is to provide an update on recent advances in the field of therapeutic ultrasound in ophthalmology.
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Abdallah WF, Patel H, Grant EG, Diniz B, Chader GJ, Humayun MS. Evaluation of ultrasound-assisted thrombolysis using custom liposomes in a model of retinal vein occlusion. Invest Ophthalmol Vis Sci 2012; 53:6920-7. [PMID: 22969076 DOI: 10.1167/iovs.12-10389] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE To study the potential efficacy of ultrasound (US) assisted by custom liposome (CLP) destruction as an innovative thrombolytic tool for the treatment of retinal vein occlusion (RVO). METHODS Experimental RVO was induced in the right eyes of 40 rabbits using laser photothrombosis; the US experiment took place 48 hours later. Rabbits were randomly divided into four equal groups: US+CLP group, US+saline group, CLP+sham US group, and no treatment group. The latter three groups acted as controls. Fundus fluorescein angiography and Doppler US were used to evaluate retinal blood flow. RESULTS CLP-assisted US thrombolysis resulted in restoration of flow in seven rabbits (70%). None of the control groups showed significant restoration of retinal venous blood flow. CONCLUSIONS US-assisted thrombolysis using liposomes resulted in a statistically significant reperfusion of retinal vessels in the rabbit experimental model of RVO. This approach might be promising in the treatment of RVO in humans. Further studies are needed to evaluate this approach in patients with RVO. Ultrasound assisted thrombolysis can be an innovative tool in management of retinal vein occlusion.
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Zhou Q, Chen JL, Chen Q, Wang X, Deng Q, Hu B, Guo RQ. Optimization of transfection parameters for ultrasound/SonoVue microbubble-mediated hAng-1 gene delivery in vitro. Mol Med Rep 2012; 6:1460-4. [PMID: 23023760 DOI: 10.3892/mmr.2012.1100] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Accepted: 09/20/2012] [Indexed: 11/06/2022] Open
Abstract
This study aimed to explore the effects of microbubble concentration, gene dosage, cell-microbubble mixing mode and fetal bovine serum (FBS) on gene delivery. 293T cells were transfected with Sonovue microbubbles carrying the hAng-1 gene via ultrasound irradiation. Various ultrasound exposure parameters and microbubble and DNA concentrations were investigated. In addition, FBS and the cell suspension or adherent mode was explored. Transfection efficiency and cell viability were used to determine the optimal transfection parameters. hAng-1 gene transfection efficiency gradually increased with elongation of ultrasound exposure and increasing microbubble concentration. However, if ultrasound irradiation exceeded 1.5 W/cm² and 30 sec or the microbubble concentration was over 20%, hAng-1 gene expression was significantly decreased, coupled with extensive cell death. Gene transfection levels were low under DNA concentrations less than 15 µg/ml. Furthermore, the gene transfer rate was significantly increased under cell suspension mode; FBS had no effect on hAng-1 gene transfection. The integrity of hAng-1 DNA was not affected by ultrasonic irradiation under optimal conditions. The optimal transfection parameters for the hAng-1 gene and Sonovue microbubble were ultrasound exposure of 1.5 W/cm² and 30 sec, 20% microbubbles, 15 µg/ml of DNA and under cell suspension mode.
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Affiliation(s)
- Qing Zhou
- Department of Ultrasound Imaging, Renmin Hospital of Wuhan University, Wuhan 430060, P.R. China
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20
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Kitazoe K, Park YS, Kaji N, Okamoto Y, Tokeshi M, Kogure K, Harashima H, Baba Y. Fabrication of functionalized double-lamellar multifunctional envelope-type nanodevices using a microfluidic chip with a chaotic mixer array. PLoS One 2012; 7:e39057. [PMID: 22723929 PMCID: PMC3377610 DOI: 10.1371/journal.pone.0039057] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2011] [Accepted: 05/16/2012] [Indexed: 11/30/2022] Open
Abstract
Multifunctional envelope-type nanodevices (MENDs) are very promising non-viral gene delivery vectors because they are biocompatible and enable programmed packaging of various functional elements into an individual nanostructured liposome. Conventionally MENDs have been fabricated by complicated, labor-intensive, time-consuming bulk batch methods. To avoid these problems in MEND fabrication, we adopted a microfluidic chip with a chaotic mixer array on the floor of its reaction channel. The array was composed of 69 cycles of the staggered chaotic mixer with bas-relief structures. Although the reaction channel had very large Péclet numbers (>10(5)) favorable for laminar flows, its chaotic mixer array led to very small mixing lengths (<1.5 cm) and that allowed homogeneous mixing of MEND precursors in a short time. Using the microfluidic chip, we fabricated a double-lamellar MEND (D-MEND) composed of a condensed plasmid DNA core and a lipid bilayer membrane envelope as well as the D-MEND modified with trans-membrane peptide octaarginine. Our lab-on-a-chip approach was much simpler, faster, and more convenient for fabricating the MENDs, as compared with the conventional bulk batch approaches. Further, the physical properties of the on-chip-fabricated MENDs were comparable to or better than those of the bulk batch-fabricated MENDs. Our fabrication strategy using microfluidic chips with short mixing length reaction channels may provide practical ways for constructing more elegant liposome-based non-viral vectors that can effectively penetrate all membranes in cells and lead to high gene transfection efficiency.
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Affiliation(s)
- Katsuma Kitazoe
- Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Japan
| | - Yeon-Su Park
- Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Japan
- FIRST Research Center for Innovative Nanobiodevices, Nagoya University, Nagoya, Japan
| | - Noritada Kaji
- Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Japan
- FIRST Research Center for Innovative Nanobiodevices, Nagoya University, Nagoya, Japan
| | - Yukihiro Okamoto
- Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Japan
- FIRST Research Center for Innovative Nanobiodevices, Nagoya University, Nagoya, Japan
| | - Manabu Tokeshi
- Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Japan
- FIRST Research Center for Innovative Nanobiodevices, Nagoya University, Nagoya, Japan
| | - Kentaro Kogure
- Department of Biophysical Chemistry, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Hideyoshi Harashima
- Laboratory for Molecular Design of Pharmaceutics, Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan
| | - Yoshinobu Baba
- Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Japan
- FIRST Research Center for Innovative Nanobiodevices, Nagoya University, Nagoya, Japan
- Health Technology Research Center, National Institute of Advanced Industrial Science and Technology, Takamatsu, Japan
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Selective gene transfer to the retina using intravitreal ultrasound irradiation. J Ophthalmol 2012; 2012:412752. [PMID: 22518277 PMCID: PMC3307015 DOI: 10.1155/2012/412752] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2011] [Revised: 10/30/2011] [Accepted: 10/30/2011] [Indexed: 12/03/2022] Open
Abstract
This paper aims to evaluate the efficacy of intravitreal ultrasound (US) irradiation for green fluorescent protein (GFP) plasmid transfer into the rabbit retina using a miniature US transducer. Intravitreal US irradiation was performed by a slight modification of the transconjunctival sutureless vitrectomy system utilizing a small probe. After vitrectomy, the US probe was inserted through a scleral incision. A mixture of GFP plasmid (50 μL) and bubble liposomes (BLs; 50 μL) was injected into the vitreous cavity, and US was generated to the retina using a SonoPore 4000. The control group was not exposed to US. After 72 h, the gene-transfer efficiency was quantified by counting the number of GFP-positive cells. The retinas that received plasmid, BL, and US showed a significant increase in the number (average ± SEM) of GFP-positive cells (32 ± 4.9; n = 7; P < 0.01 ). No GFP-positive cells were observed in the control eyes (n = 7). Intravitreal retinal US irradiation can transfer the GFP plasmid into the retina without causing any apparent damage. This procedure could be used to transfer genes and drugs directly to the retina and therefore has potential therapeutic value.
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Kowalczuk L, Boudinet M, El Sanharawi M, Touchard E, Naud MC, Saïed A, Jeanny JC, Behar-Cohen F, Laugier P. In vivo gene transfer into the ocular ciliary muscle mediated by ultrasound and microbubbles. ULTRASOUND IN MEDICINE & BIOLOGY 2011; 37:1814-1827. [PMID: 21963032 DOI: 10.1016/j.ultrasmedbio.2011.07.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2011] [Revised: 06/17/2011] [Accepted: 07/23/2011] [Indexed: 05/31/2023]
Abstract
This study aimed to assess application of ultrasound (US) combined with microbubbles (MB) to transfect the ciliary muscle of rat eyes. Reporter DNA plasmids encoding for Gaussia luciferase, β-galactosidase or the green fluorescent protein (GFP), alone or mixed with 50% Artison MB, were injected into the ciliary muscle, with or without US exposure (US set at 1 MHz, 2 W/cm(2), 50% duty cycle for 2 min). Luciferase activity was measured in ocular fluids at 7 and 30 days after sonoporation. At 1 week, the US+MB treatment showed a significant increase in luminescence compared with control eyes, injected with plasmid only, with or without MB (×2.6), and, reporter proteins were localized in the ciliary muscle by histochemical analysis. At 1 month, a significant decrease in luciferase activity was observed in all groups. A rise in lens and ciliary muscle temperature was measured during the procedure but did not result in any observable or microscopic damages at 1 and 8 days. The feasibility to transfer gene into the ciliary muscle by US and MB suggests that sonoporation may allow intraocular production of proteins for the treatment of inflammatory, angiogenic and/or degenerative retinal diseases.
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Affiliation(s)
- Laura Kowalczuk
- Inserm U872, Physiopathology of Ocular Diseases: Therapeutic Innovations, Paris, France
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23
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Mohan RR, Tovey JCK, Sharma A, Tandon A. Gene therapy in the cornea: 2005--present. Prog Retin Eye Res 2011; 31:43-64. [PMID: 21967960 DOI: 10.1016/j.preteyeres.2011.09.001] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2011] [Revised: 08/31/2011] [Accepted: 09/01/2011] [Indexed: 12/13/2022]
Abstract
Successful restoration of vision in human patients with gene therapy affirmed its promise to cure ocular diseases and disorders. The efficacy of gene therapy is contingent upon vector and mode of therapeutic DNA introduction into targeted cells/tissues. The cornea is an ideal tissue for gene therapy due to its ease of access and relative immune-privilege. Considerable progress has been made in the field of corneal gene therapy in last 5 years. Several new gene transfer vectors, techniques and approaches have evolved. Although corneal gene therapy is still in its early stages of development, the potential of gene-based interventions to treat corneal abnormalities has begun to surface. Identification of next generation viral and nanoparticle vectors, characterization of delivered gene levels, localization, and duration in the cornea, and significant success in controlling corneal disorders, particularly fibrosis and angiogenesis, in experimental animal disease models, with no major side effects have propelled gene therapy a step closer toward establishing gene-based therapies for corneal blindness. Recently, researchers have assessed the delivery of therapeutic genes for corneal diseases and disorders due to trauma, infections, chemical, mechanical, and surgical injury, and/or abnormal wound healing. This review provides an update on the developments in gene therapy for corneal diseases and discusses the barriers that hinder its utilization for delivering genes in the cornea.
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Affiliation(s)
- Rajiv R Mohan
- Harry S. Truman Memorial Veterans' Hospital, 800 Hospital Drive, Columbia, MO 65201, USA.
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24
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Kopechek JA, Kim H, McPherson DD, Holland CK. Calibration of the 1-MHz Sonitron ultrasound system. ULTRASOUND IN MEDICINE & BIOLOGY 2010; 36:1762-6. [PMID: 20800963 PMCID: PMC4357174 DOI: 10.1016/j.ultrasmedbio.2010.05.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2010] [Revised: 04/13/2010] [Accepted: 05/18/2010] [Indexed: 05/11/2023]
Abstract
Successful drug and gene delivery across cellular membranes can lead to improved therapeutic outcomes. Recent studies have suggested that sonoporation may enhance drug and gene delivery across cellular membranes. The enhancement may be a result of transient permeation of the membrane from cavitation or microstreaming effects of microbubbles exposed to ultrasound. Given limited acoustic pressure calibration and beam profile characterization of the Sonitron ultrasound systems in cellular bioeffects studies previously published, the objective of this work was to calibrate the acoustic output and explore the potential for standing waves in a cell-well plate. In this study, three 1-MHz transducers driven by Sonitron ultrasound systems, which have been used in a number of sonoporation studies, were calibrated. Transducers with 10-mm, 6-mm and 20-mm-diameter apertures (Sonitron 1000 and 2000, Rich-Mar, Inola, OK, USA) were calibrated using polyvinylidene fluoride (PVDF) needle hydrophones. Axial and transverse beam profiles were obtained, and the pressures were measured as a function of Sonitron intensity dial setting and duty cycle. The acoustic intensity was calculated and compared with the Sonitron intensity dial setting for duty cycles from 10-100%. Standing waves caused by reflections from the hydrophone holder were detected for each transducer. This observation may also have implications for in vitro sonoporation studies. Acoustic field characterization is an important first step in understanding the mechanisms of sonoporation and drug delivery across biomembranes.
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Affiliation(s)
- Jonathan A Kopechek
- Department of Biomedical Engineering, Colleges of Engineering and Medicine, University of Cincinnati, Cincinnati, OH 45267-0586, USA.
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25
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Suzuki R, Oda Y, Utoguchi N, Maruyama K. Progress in the development of ultrasound-mediated gene delivery systems utilizing nano- and microbubbles. J Control Release 2010; 149:36-41. [PMID: 20470839 DOI: 10.1016/j.jconrel.2010.05.009] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2009] [Revised: 04/28/2010] [Accepted: 05/06/2010] [Indexed: 12/11/2022]
Abstract
Recently, ultrasound-mediated gene delivery with nano- and microbubbles was developed as a novel non-viral vector system. In this gene delivery system, microstreams and microjets, which are induced by disruption of nano/microbubbles exposed to ultrasound, are used as the driving force to transfer genes into cells by opening transient pores in the cell membrane. This system can directly deliver plasmid DNA and siRNA into cytosol without endocytosis pathway. Therefore, these genes are able to escape from degradation in lysosome and result in enhancing the efficiency of gene expression. In addition, it is expected that ultrasound-mediated gene delivery using nano/microbubbles would be a system to establish non-invasive and tissue specific gene expression because ultrasound can transdermally expose to target tissues and organs. This review focuses on the current ultrasound-mediated gene delivery system using nano/microbubbles. We discuss about the feasibility of this gene delivery system as novel non-viral vector system.
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Affiliation(s)
- Ryo Suzuki
- Department of Biopharmaceutics, School of Pharmaceutical Sciences, Teikyo University, 1091-1 Suwarashi, Midori-ku, Sagamihara, Kanagawa 252-5195, Japan
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26
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Solid lipid nanoparticles as potential tools for gene therapy: In vivo protein expression after intravenous administration. Int J Pharm 2010; 385:157-62. [DOI: 10.1016/j.ijpharm.2009.10.020] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2009] [Revised: 10/06/2009] [Accepted: 10/07/2009] [Indexed: 11/22/2022]
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Abstract
The cornea is particularly suited to gene therapy. The cornea is readily accessible, normally transparent, and is somewhat sequestrated from the general circulation and the systemic immune system. The principle of genetic therapy for the cornea is to use an appropriate vector system to transfer a gene to the cornea itself, or to the ocular environs, or systemically, so that a transgenic protein will be expressed that will modulate congenital or acquired disease. The protein may be structural such as a collagen, or functionally active such as an enzyme, cytokine or growth factor that may modulate a pathological process. Alternatively, gene expression may be silenced by the use of modalities such as antisense oligonucleotides. Interestingly, despite a very considerable amount of work in animal models, clinical translation directed to gene therapy of the human cornea has been minimal. This is in contrast to gene therapy for monogenic inherited diseases of the retina, where promising early results of clinical trials for Leber's congenital amaurosis have already been published and a number of other trials are ongoing.
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Affiliation(s)
- Keryn A Williams
- Department of Ophthalmology, Flinders University, Adelaide, South Australia 5042, Australia.
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28
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Yamashita T, Ohtsuka H, Arimura N, Sonoda S, Kato C, Ushimaru K, Hara N, Tachibana K, Sakamoto T. Sonothrombolysis for intraocular fibrin formation in an animal model. ULTRASOUND IN MEDICINE & BIOLOGY 2009; 35:1845-1853. [PMID: 19699025 DOI: 10.1016/j.ultrasmedbio.2009.05.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2008] [Revised: 05/22/2009] [Accepted: 05/28/2009] [Indexed: 05/28/2023]
Abstract
Vascular diseases such as diabetic retinopathy or retinal arterial occlusion are always associated with retinal and/or choroidal vasculopathy and intravascular thrombosis is commonly found. The ultrasound (US) therapy is a recently developed technique to accelerate fibrinolysis and it is being applied to some clinical fields. The present study was to observe the effects of extraocular US exposure on intraocular fibrin, which is a deteriorating factor in various ocular diseases. Tubes containing human blood (2 mL) in the following groups were irradiated with US; US alone, US with tissue plasminogen activator (tPA), tPA alone, and saline (control). Fibrinolysis was quantified by measuring D-dimer after 2h. In rat eyes, intracameral fibrin (fibrin formation in the anterior chamber of the eye) was induced by YAG-laser-induced iris bleeding. Then, eyes in the following groups were irradiated with US; US alone, subconjunctival tPA alone, US and subconjunctival tPA, control. Intracameral fibrin was scored on day 3 (3+ maximum to 0). The temperatures of rat eyes were measured by infrared thermography. Histologic evaluation was also performed. D-dimer was increased by US with statistical significance (p <0.05) or tPA (p <0.01). D-dimer in US with tPA group was significantly higher than either US alone or tPA alone group (p <0.01). In rat eyes, the average intracameral fibrin score on day 3 was 1.4 in control group and 1.2 in subconjunctival tPA alone group; however, it decreased significantly in the US alone group (0.75; p <0.05, vs. control), US and subconjunctival tPA group (0.71; p <0.01, vs. control). The temperature was less than 34 degrees C after US exposure. No histologic damage was observed. US irradiation from outside accelerated intracameral fibrinolysis without causing apparent tissue damage. This noninvasive method might have therapeutic value for intraocular fibrin.
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Affiliation(s)
- Toshifumi Yamashita
- Department of Ophthalmology, Kagoshima University Graduate School of Medical and Dental Sciences, Sakuragaoka, Kagoshima 890-8520, Japan
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29
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Suzuki R, Namai E, Oda Y, Nishiie N, Otake S, Koshima R, Hirata K, Taira Y, Utoguchi N, Negishi Y, Nakagawa S, Maruyama K. Cancer gene therapy by IL-12 gene delivery using liposomal bubbles and tumoral ultrasound exposure. J Control Release 2009; 142:245-50. [PMID: 19883708 DOI: 10.1016/j.jconrel.2009.10.027] [Citation(s) in RCA: 137] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2009] [Revised: 10/09/2009] [Accepted: 10/26/2009] [Indexed: 12/25/2022]
Abstract
Interleukin-12 (IL-12) gene therapy is expected to be effective against cancers because it primes the immune system for cancer cells. In this therapy, it is important to induce IL-12 gene expression in the tumor tissue. Sonoporation is an attractive technique for developing non-invasive and non-viral gene delivery systems, but simple sonoporation using only ultrasound is not an effective cancer gene therapy because of the low efficiency of gene delivery. We addressed this problem by combining ultrasound and novel ultrasound-sensitive liposomes (Bubble liposomes) which contain the ultrasound imaging gas perfluoropropane. Our previous work showed that this is an effective gene delivery system, and that Bubble liposome collapse (cavitation) is induced by ultrasound exposure. In this study, we assessed the utility of this system in cancer gene therapy using IL-12 corded plasmid DNA. The combination of Bubble liposomes and ultrasound dramatically suppressed tumor growth. This therapeutic effect was T-cell dependent, requiring mainly CD8(+) T lymphocytes in the effector phase, as confirmed by a mouse in vivo depletion assay. In addition, migration of CD8(+) T cells was observed in the mice, indicating that the combination of Bubble liposomes and ultrasound is a good non-viral vector system in IL-12 cancer gene therapy.
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Affiliation(s)
- Ryo Suzuki
- Department of Biopharmaceutics, School of Pharmaceutical Sciences, Teikyo University, Sagamihara, Kanagawa, Japan
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Hao J, Li SK, Liu CY, Kao WWY. Electrically assisted delivery of macromolecules into the corneal epithelium. Exp Eye Res 2009; 89:934-41. [PMID: 19682448 DOI: 10.1016/j.exer.2009.08.001] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2009] [Revised: 07/27/2009] [Accepted: 08/04/2009] [Indexed: 11/18/2022]
Abstract
Electrically assisted delivery is noninvasive and has been investigated in a number of ocular drug delivery studies. The objectives of this study were to examine the feasibility of electrically assisted delivery of macromolecules such as small interfering RNA (siRNA) into the corneal epithelium, to optimize the iontophoresis and electroporation methods, and to study the mechanisms of corneal iontophoresis for macromolecules. Anodal and cathodal iontophoresis, electroporation and their combinations were the methods examined with mice in vivo. Cyanine 3 (Cy3)-labeled glyceraldehyde-3-phosphate dehydrogenase (GAPDH) siRNA and fluorescein isothiocyanate (FITC)-labeled dextran of different molecular weights (4-70 kDa) were the macromolecules studied. Microscopy and histology after cryostat sectioning were used to analyze and compare the delivery of the macromolecules to the cornea. Iontophoresis was effective in delivering siRNA and dextran up to 70 kDa into the cornea. The electroporation method studied was less effective than that of iontophoresis. Although both iontophoresis and electroporation alone can deliver the macromolecules into the cornea, these methods alone were not as effective as the combination of iontophoresis and electroporation (iontophoresis followed by electroporation). The significant enhancement of dextran delivery in anodal iontophoresis suggests that electroosmosis can be a significant flux-enhancing mechanism during corneal iontophoresis. These results illustrate the feasibility of electrically assisted delivery of macromolecules such as siRNA into the cornea.
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Affiliation(s)
- Jinsong Hao
- Division of Pharmaceutical Sciences, College of Pharmacy, University of Cincinnati, 3225 Eden Ave, HPB 136, Cincinnati, OH 45267, USA
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31
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Naik R, Mukhopadhyay A, Ganguli M. Gene delivery to the retina: focus on non-viral approaches. Drug Discov Today 2009; 14:306-15. [DOI: 10.1016/j.drudis.2008.09.012] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2008] [Revised: 09/11/2008] [Accepted: 09/29/2008] [Indexed: 01/23/2023]
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32
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Mayer CR, Geis NA, Katus HA, Bekeredjian R. Ultrasound targeted microbubble destruction for drug and gene delivery. Expert Opin Drug Deliv 2009; 5:1121-38. [PMID: 18817517 DOI: 10.1517/17425247.5.10.1121] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Gas-filled microbubbles have been used as ultrasound contrast agents for some decades. More recently, such microbubbles have evolved as experimental tools for organ- and tissue-specific drug and gene delivery. When sonified with ultrasound near their resonance frequency, microbubbles oscillate. With higher ultrasound energies, oscillation amplitudes increase, leading to microbubble destruction. This phenomenon can be used to deliver a substance into a target organ, if microbubbles are co-administered loaded with drugs or gene therapy vectors before i.v. injection. OBJECTIVE This review focuses on different experimental applications of microbubbles as tools for drug and gene delivery. Different organ systems and different classes of bioactive substances that have been used in previous studies will be discussed. METHODS All the available literature was reviewed to highlight the potential of this non-invasive, organ-specific delivery system. CONCLUSION Ultrasound targeted microbubble destruction has been used in various organ systems and in tumours to successfully deliver drugs, proteins, gene therapy vectors and gene silencing constructs. Many proof of principle studies have demonstrated its potential as a non-invasive delivery tool. However, too few large animal studies and studies with therapeutic aims have been performed to see a clinical application of this technique in the near future. Nevertheless, there is great hope that preclinical large animal studies will confirm the successful results already obtained in small animals.
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Affiliation(s)
- Christian R Mayer
- University of Heidelberg, Department of Internal Medicine III, Im Neuenheimer Feld 410, 69120 Heidelberg,Germany
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Suzuki R, Oda Y, Utoguchi N, Namai E, Taira Y, Okada N, Kadowaki N, Kodama T, Tachibana K, Maruyama K. A novel strategy utilizing ultrasound for antigen delivery in dendritic cell-based cancer immunotherapy. J Control Release 2008; 133:198-205. [PMID: 19000727 DOI: 10.1016/j.jconrel.2008.10.015] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2008] [Revised: 10/13/2008] [Accepted: 10/16/2008] [Indexed: 12/30/2022]
Abstract
In dendritic cell (DC)-based cancer immunotherapy, it is important that DCs present peptides derived from tumor-associated antigens on MHC class I, and activate tumor-specific cytotoxic T lymphocytes (CTLs). However, MHC class I generally present endogenous antigens expressed in the cytosol. We therefore developed an innovative approach capable of directly delivering exogenous antigens into the cytosol of DCs; i.e., a MHC class I-presenting pathway. In this study, we investigated the effect of antigen delivery using perfluoropropane gas-entrapping liposomes (Bubble liposomes, BLs) and ultrasound (US) exposure on MHC class I presentation levels in DCs, as well as the feasibility of using this antigen delivery system in DC-based cancer immunotherapy. DCs were treated with ovalbumin (OVA) as a model antigen, BLs and US exposure. OVA was directly delivered into the cytosol but not via the endocytosis pathway, and OVA-derived peptides were presented on MHC class I. This result indicates that exogenous antigens can be recognized as endogenous antigens when delivered into the cytosol. Immunization with DCs treated with OVA, BLs and US exposure efficiently induced OVA-specific CTLs and resulted in the complete rejection of E.G7-OVA tumors. These data indicate that the combination of BLs and US exposure is a promising antigen delivery system in DC-based cancer immunotherapy.
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Affiliation(s)
- Ryo Suzuki
- Department of Biopharmaceutics, School of Pharmaceutical Sciences, Teikyo University, Sagamiko-cho, Sagamihara, Kanagawa, Japan
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Li YS, Davidson E, Reid CN, McHale AP. Optimising ultrasound-mediated gene transfer (sonoporation) in vitro and prolonged expression of a transgene in vivo: potential applications for gene therapy of cancer. Cancer Lett 2008; 273:62-9. [PMID: 18829156 DOI: 10.1016/j.canlet.2008.07.030] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2008] [Revised: 05/12/2008] [Accepted: 07/24/2008] [Indexed: 11/24/2022]
Abstract
Therapeutic approaches using gene-based medicines promise alternatives or adjuncts to conventional cancer treatment. Because of its non-invasive nature, ultrasound, as a membrane-permeabilising stimulus has the potential to be highly competitive with viral gene delivery and existing non-viral alternatives. In optimising ultrasound-mediated, microbubble-assisted (MB101) gene tranfection in vitro, we demonstrate efficiencies of up to 18% using ultrasound at 1 MHz at a duty cycle of 25% at intensities ranging from 1 to 4 W cm(-2). Using ultrasound-mediated transfection together with an episomal plasmid-based gene expression system, we demonstrate prolonged functional gene expression of luciferase in mouse hind leg muscle and in tumours in vivo.
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Affiliation(s)
- Ying Suet Li
- School of Biomedical Sciences, University of Ulster, Cromore Road, Coleraine, Co. Derry, BT 52 1SA, Northern Ireland, United Kingdom
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Peeters L, Lentacker I, Vandenbroucke RE, Lucas B, Demeester J, Sanders NN, De Smedt SC. Can ultrasound solve the transport barrier of the neural retina? Pharm Res 2008; 25:2657-65. [PMID: 18649123 DOI: 10.1007/s11095-008-9684-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2008] [Accepted: 07/03/2008] [Indexed: 01/30/2023]
Abstract
PURPOSE Intravitreal injection of nonviral gene complexes may be promising in the treatment of retinal diseases. This study investigates the permeation of lipoplexes and polystyrene nanospheres through the neural retina and their uptake by the retinal pigment epithelium (RPE) either with or without ultrasound application. MATERIALS AND METHODS Anterior parts and vitreous of bovine eyes were removed. The neural retina was left intact or peeled away from the RPE. (Non)pegylated lipoplexes and pegylated nanospheres were applied. After 2 h incubation, the RPE cells were detached and analyzed for particle uptake by flow cytometry and confocal microscopy. RESULTS The neural retina is a significant transport barrier for pegylated nanospheres and (non)pegylated lipoplexes. Applying ultrasound improved the permeation of the nanoparticles up to 130 nm. CONCLUSIONS Delivery of liposomal DNA complexes to the RPE cells is strongly limited by the neural retina. Ultrasound energy may be a useful tool to improve the neural retina permeability, given the nucleic acid carriers are small enough. Our results underline the importance to design and develop very small carriers for the delivery of nucleic acids to the neural retina and the RPE after intravitreal injection.
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Affiliation(s)
- Liesbeth Peeters
- Laboratory of General Biochemistry and Physical Pharmacy, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium
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Wang JF, Wu CJ, Zhang CM, Qiu QY, Zheng M. Ultrasound-mediated microbubble destruction facilitates gene transfection in rat C6 glioma cells. Mol Biol Rep 2008; 36:1263-7. [PMID: 18618290 DOI: 10.1007/s11033-008-9307-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2008] [Accepted: 06/27/2008] [Indexed: 11/30/2022]
Abstract
The goal of this study was to determine whether ultrasound (US) exposure combined with microbubble destruction could be used to enhance non-viral gene delivery in rat C6 glioma cells. Microbubbles were prepared and gently mixed with plasmid DNA. The mixture of the DNA and microbubbles was administered to cultured C6 cells under different US/microbubble conditions. Transfection efficiency and cell viability were assessed by FACS analysis, confocal laser scanning microscopy, and Trypan blue staining. The results demonstrate that microbubble with US exposure could significantly enhance the reporter gene expression as compared with other groups. No statistical significant difference was observed in the glioma cell viability between different groups. Our in vitro findings suggest that US-mediated microbubble destruction has the potential to promote safe and efficient gene transfer into C6 cells. This non-invasive gene transfer method may be useful for safe clinical gene therapy of brain cancer without a viral vector system.
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Affiliation(s)
- Jun-Feng Wang
- Department of Ultrasound, The First Affiliated Hospital of Harbin Medical University, Harbin, 150001, People's Republic of China
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Su CH, Yeh HI, Hou CJY, Tsai CH. Nonviral Technologies for Gene Therapy in Cardiovascular Research. INT J GERONTOL 2008. [DOI: 10.1016/s1873-9598(08)70009-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Wang JF, Wang JB, Chen H, Zhang CM, Liu L, Pan SH, Wu CJ. Ultrasound-mediated microbubble destruction enhances gene transfection in pancreatic cancer cells. Adv Ther 2008; 25:412-21. [PMID: 18463802 DOI: 10.1007/s12325-008-0051-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
INTRODUCTION The purpose of this study was to determine whether ultrasound exposure combined with microbubble destruction could be used to enhance non-viral gene delivery in human pancreatic carcinoma cells (PANC-1). METHODS The study was performed with four experimental groups: Group P, plasmid alone; Group P+M, plasmid and microbubbles; Group P+U, plasmid and ultrasound; Group P+U+M, plasmid with ultrasound and microbubbles. Plasmid DNA encoding enhanced green fluorescent protein (pEGFP) was gently mixed with commercially available ultrasound microbubble contrast agents (SonoVue; Bracco Diagnostics Inc, Milan, Italy) in Group P+M and Group P+U+M. The different combinations of DNA and DNA plus microbubbles were added to cultured PANC-1 cells under different conditions. Transfection efficiency and cell viability were assessed by FACS analysis (Becton Dickinson, San Jose, CA, USA), confocal laser scanning microscopy, and trypan blue staining. RESULTS The results demonstrated that microbubbles with ultrasound exposure could significantly enhance the reporter gene expression as compared with other groups (Group P+U+M, 21.4%+/-3.16%; Group P, 2.9%+/-0.45%; Group P+M, 3.1%+/-0.51%; Group P+U, 6.1%+/-1.27%; P<0.01). No statistically significant difference was observed in the PANC-1 cell viability between Group P+U+M and other groups (P>0.05). CONCLUSION Our in-vitro findings suggest that ultrasound-mediated microbubble destruction has the potential to promote efficient gene transfer into PANC-1 cells without significant cell death. This non-invasive gene transfer method may be a useful tool for safe clinical gene therapy of pancreatic cancer in the future.
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Affiliation(s)
- Jun-Feng Wang
- Department of Ultrasound, First Affiliated Hospital of Harbin Medical University, Harbin, China.
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Suzuki R, Oda Y, Namai E, Takizawa T, Negishi Y, Utoguchi N, Tachibana K, Maruyama K. [Development of site specific gene delivery system with sonoporation]. YAKUGAKU ZASSHI 2008; 128:187-92. [PMID: 18239366 DOI: 10.1248/yakushi.128.187] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In gene therapy, it is important to develop an effective and safe gene delivery system. Especially, from the viewpoint of reducing side effects, gene delivery into a specific site is essential. We previously, developed liposomal bubbles (Bubble liposomes) containing perfluoropropane. Bubble liposomes were useful as ultrasound enhanced gene delivery tools in vitro and in vivo. In this review, we introduced the characteristics of Bubble liposomes as ultrasound imaging agents and ultrasound enhanced gene delivery tools. Bubble liposomes worked as ultrasound imaging agents in cardiosonography. In addition, their combination with ultrasound exposure was able to deliver plasmid DNA in the femoral artery. The gene expression was only observed at the site of ultrasound exposure. Moreover, the gene delivery by Bubble liposomes and ultrasound exposure was more efficient than that by conventional lipofection method using Lipofectamine 2000. Therefore, it was suggested that Bubble liposomes might be a new class of tools for site specific gene delivery.
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Affiliation(s)
- Ryo Suzuki
- Department of Biopharmaceutics, School of Pharmaceutical Sciences, Teikyo University, Sagamihara City, Japan
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