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Gupta P, Balasubramaniam N, Chang HY, Tseng FG, Santra TS. A Single-Neuron: Current Trends and Future Prospects. Cells 2020; 9:E1528. [PMID: 32585883 PMCID: PMC7349798 DOI: 10.3390/cells9061528] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 06/15/2020] [Accepted: 06/19/2020] [Indexed: 12/11/2022] Open
Abstract
The brain is an intricate network with complex organizational principles facilitating a concerted communication between single-neurons, distinct neuron populations, and remote brain areas. The communication, technically referred to as connectivity, between single-neurons, is the center of many investigations aimed at elucidating pathophysiology, anatomical differences, and structural and functional features. In comparison with bulk analysis, single-neuron analysis can provide precise information about neurons or even sub-neuron level electrophysiology, anatomical differences, pathophysiology, structural and functional features, in addition to their communications with other neurons, and can promote essential information to understand the brain and its activity. This review highlights various single-neuron models and their behaviors, followed by different analysis methods. Again, to elucidate cellular dynamics in terms of electrophysiology at the single-neuron level, we emphasize in detail the role of single-neuron mapping and electrophysiological recording. We also elaborate on the recent development of single-neuron isolation, manipulation, and therapeutic progress using advanced micro/nanofluidic devices, as well as microinjection, electroporation, microelectrode array, optical transfection, optogenetic techniques. Further, the development in the field of artificial intelligence in relation to single-neurons is highlighted. The review concludes with between limitations and future prospects of single-neuron analyses.
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Affiliation(s)
- Pallavi Gupta
- Department of Engineering Design, Indian Institute of Technology Madras, Tamil Nadu 600036, India; (P.G.); (N.B.)
| | - Nandhini Balasubramaniam
- Department of Engineering Design, Indian Institute of Technology Madras, Tamil Nadu 600036, India; (P.G.); (N.B.)
| | - Hwan-You Chang
- Department of Medical Science, National Tsing Hua University, Hsinchu 30013, Taiwan;
| | - Fan-Gang Tseng
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu 30013, Taiwan;
| | - Tuhin Subhra Santra
- Department of Engineering Design, Indian Institute of Technology Madras, Tamil Nadu 600036, India; (P.G.); (N.B.)
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Santra TS, Kar S, Chen TC, Chen CW, Borana J, Lee MC, Tseng FG. Near-infrared nanosecond-pulsed laser-activated highly efficient intracellular delivery mediated by nano-corrugated mushroom-shaped gold-coated polystyrene nanoparticles. NANOSCALE 2020; 12:12057-12067. [PMID: 32469040 DOI: 10.1039/d0nr01792b] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Here, an efficient intracellular delivery of molecules with high cell viability is reported using nanosecond-pulsed laser-activated plasmonic photoporation, mediated by high-aspect-ratio nano-corrugated mushroom-shaped gold-coated polystyrene nanoparticles (nm-AuPNPs) at near-infrared wavelength. Upon pulsed laser illumination, nm-AuPNPs exhibit greater plasmonic extinction than spherical AuPNPs, which increase their energy efficiency and reduce the necessary illumination of light, effectively controlling cell damage and improving the delivery efficiency. Nm-AuPNPs exhibit surface plasmon absorption at near infrared region with a peak at 945 nm. Pulsed laser illumination at this plasmon peak triggers explosive nanobubbles, which create transient membrane pores, allowing the delivery of dyes, quantum dots and plasmids into the different cell types. The results can be tuned by laser fluence, exposure time, molecular size and concentration of nm-AuPNPs. The best results are found for CL1-0 cells, which yielded a 94% intracellular PI dye uptake and ∼100% cell viability at 35 mJ cm-2 laser fluence for 945 nm wavelength. Thus, the presented approach has proven to have an inevitable potential for biological cell research and therapeutic applications.
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Affiliation(s)
- Tuhin Subhra Santra
- Department of Engineering Design, Indian Institute of Technology Madras, India.
| | - Srabani Kar
- Electrical Engineering Division, University of Cambridge, CB3 0FA, Cambridge, UK
| | - Te-Chang Chen
- Institute of Photonics Technology, National Tsing Hua University, Taiwan
| | - Chih-Wei Chen
- Institute of Molecular Medicine, National Tsing Hua University, Taiwan
| | - Jayant Borana
- Department of Engineering and System Science, National Tsing Hua University, Taiwan.
| | - Ming-Chang Lee
- Institute of Photonics Technology, National Tsing Hua University, Taiwan and Department of Electrical Engineering, National Tsing Hua University, Taiwan
| | - Fan-Gang Tseng
- Department of Engineering and System Science, National Tsing Hua University, Taiwan. and Institute of Nanoengineering and Microsystems, National Tsing Hua University, Taiwan and Division of Mechanics, Research Center for Applied Sciences, Academia Sinica, Taiwan
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3
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The role of bacterial toxins and spores in cancer therapy. Life Sci 2019; 235:116839. [PMID: 31499068 DOI: 10.1016/j.lfs.2019.116839] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 08/21/2019] [Accepted: 09/04/2019] [Indexed: 12/16/2022]
Abstract
Cancer is one of the leading causes of human death worldwide. Conventional anticancer therapies are ineffective in treating cancer patients due to various reasons. Thus, more effective and accessible alternative anticancer strategies have been evolved with time with high specificity towards tumor cells and with less or no adverse effects to normal cells. One such promising therapy is the use of bacterial toxins and spores to treat advanced solid tumors. Initially, Coley paved the way towards the bacterial anticancer therapy several decades ago and now it has emerged as a potential tool to eliminate tumor cells. Bacterial spores of obligate anaerobes exclusively germinate in the hypoxic/necrotic areas and not in the well-oxygenated areas of the body. This unique phenomenon has been exploited in using bacterial spores as a remedy for cancer. Bacterial toxins also play a significant role in either directly killing tumor cells or altering the cellular processes of the tumor cells which ultimately leads to the inhibition and regression of the solid tumor. With the advancement of molecular techniques, a number of genetically-modified non-pathogenic bacteria have been developed to use in bacterial anticancer strategies. Although promising results have shown so far, further investigations are required to ensure the efficacy and the safety of the bacterial spores and toxins in treating cancer.
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Schuh RS, de Carvalho TG, Giugliani R, Matte U, Baldo G, Teixeira HF. Gene editing of MPS I human fibroblasts by co-delivery of a CRISPR/Cas9 plasmid and a donor oligonucleotide using nanoemulsions as nonviral carriers. Eur J Pharm Biopharm 2017; 122:158-166. [PMID: 29122734 DOI: 10.1016/j.ejpb.2017.10.017] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 10/16/2017] [Accepted: 10/24/2017] [Indexed: 12/21/2022]
Abstract
Mucopolysaccharidosis type I (MPS I) is an inherited disease caused by the deficiency of alpha-L-iduronidase (IDUA). This study shows the use of nanoemulsions co-complexed with the plasmid of CRISPR/Cas9 system and a donor oligonucleotide aiming at MPS I gene editing in vitro. Nanoemulsions composed of MCT, DOPE, DOTAP, DSPE-PEG, and water were prepared by high-pressure homogenization. The DNA was complexed by adsorption (NA) or encapsulation (NE) of preformed DNA/DOTAP complexes with nanoemulsions at +4/-1 charge ratio. The incubation in pure DMEM or supplemented with serum showed that the complexation with DNA was stable after 1 h of incubation, but the complexes tended to release the adsorbed DNA after 24 h of incubation, while the encapsulated DNA remained complexed in the oil core of the nanoemulsions even 48 h after incubation with DMEM. The treatment of MPS I patient's fibroblasts homozygous for the p.Trp402∗ mutation led to a significant increase in IDUA activity at 2, 15, and 30 days when compared to MPS I untreated fibroblasts. Flow cytometry and confocal microscopy demonstrated that there was a reduction in the area of lysosomes to values similar to normal, an indicator of correction of the cellular phenotype. These results show that the nanoemulsions co-complexed with the CRISPR/Cas9 system and a donor oligonucleotide could effectively transfect MPS I p.Trp402∗ patient's fibroblasts, as well as enable the production of IDUA, and represent a potential new treatment option for MPS I.
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Affiliation(s)
- Roselena Silvestri Schuh
- Programa de Pós-Graduação em Ciências Farmacêuticas da Universidade Federal do Rio Grande do Sul (UFRGS), Faculdade de Farmácia, Av. Ipiranga 2752, 90610-000 Porto Alegre, RS, Brazil; Centro de Terapia Gênica - Hospital de Clinicas de Porto Alegre, R. Ramiro Barcelos 2350, 90035-903 Porto Alegre, RS, Brazil
| | - Talita Giacomet de Carvalho
- Programa de Pós-Graduação em Genética e Biologia Molecular da Universidade Federal do Rio Grande do Sul (UFRGS), Campus do Vale, Av. Bento Gonçalves, 9500, 91501-970 Porto Alegre, RS, Brazil; Centro de Terapia Gênica - Hospital de Clinicas de Porto Alegre, R. Ramiro Barcelos 2350, 90035-903 Porto Alegre, RS, Brazil
| | - Roberto Giugliani
- Programa de Pós-Graduação em Genética e Biologia Molecular da Universidade Federal do Rio Grande do Sul (UFRGS), Campus do Vale, Av. Bento Gonçalves, 9500, 91501-970 Porto Alegre, RS, Brazil; Centro de Terapia Gênica - Hospital de Clinicas de Porto Alegre, R. Ramiro Barcelos 2350, 90035-903 Porto Alegre, RS, Brazil
| | - Ursula Matte
- Programa de Pós-Graduação em Genética e Biologia Molecular da Universidade Federal do Rio Grande do Sul (UFRGS), Campus do Vale, Av. Bento Gonçalves, 9500, 91501-970 Porto Alegre, RS, Brazil; Centro de Terapia Gênica - Hospital de Clinicas de Porto Alegre, R. Ramiro Barcelos 2350, 90035-903 Porto Alegre, RS, Brazil
| | - Guilherme Baldo
- Programa de Pós-Graduação em Genética e Biologia Molecular da Universidade Federal do Rio Grande do Sul (UFRGS), Campus do Vale, Av. Bento Gonçalves, 9500, 91501-970 Porto Alegre, RS, Brazil; Centro de Terapia Gênica - Hospital de Clinicas de Porto Alegre, R. Ramiro Barcelos 2350, 90035-903 Porto Alegre, RS, Brazil
| | - Helder Ferreira Teixeira
- Programa de Pós-Graduação em Ciências Farmacêuticas da Universidade Federal do Rio Grande do Sul (UFRGS), Faculdade de Farmácia, Av. Ipiranga 2752, 90610-000 Porto Alegre, RS, Brazil.
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5
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Ghassemi F, Madadgar O, Roohvand F, Rasekhian M, Etemadzadeh MH, Boroujeni GRN, Langroudi AG, Azadmanesh K. Translational efficiency of BVDV IRES and EMCV IRES for T7 RNA polymerase driven cytoplasmic expression in mammalian cell lines. Mol Biol 2017. [DOI: 10.1134/s002689331702011x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Schuh RS, Baldo G, Teixeira HF. Nanotechnology applied to treatment of mucopolysaccharidoses. Expert Opin Drug Deliv 2016; 13:1709-1718. [DOI: 10.1080/17425247.2016.1202235] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Roselena S. Schuh
- Programa de Pós-Graduação em Ciências Farmacêuticas da UFRGS, Faculdade de Farmácia, Porto Alegre, RS, Brazil
| | - Guilherme Baldo
- Programa de Pós-Graduação em Genética e Biologia Molecular da UFRGS, Departamento de Fisiologia, Porto Alegre, RS, Brazil
| | - Helder F. Teixeira
- Programa de Pós-Graduação em Ciências Farmacêuticas da UFRGS, Faculdade de Farmácia, Porto Alegre, RS, Brazil
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7
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Kilicay E, Karahaliloglu Z, Hazer B, Tekin IÖ, Denkbas EB. Concanavaline A conjugated bacterial polyester-based PHBHHx nanoparticles loaded with curcumin for breast cancer therapy. J Microencapsul 2016; 33:274-85. [DOI: 10.3109/02652048.2016.1169325] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Ebru Kilicay
- Zonguldak Vocational High School, Bülent Ecevit University, Zonguldak, Turkey
| | | | - Baki Hazer
- Department of Chemistry, Physical Chemistry Division, Bülent Ecevit University, Zonguldak, Turkey
| | - Ishak Özel Tekin
- Department of Medical Immunology, Faculty of Medicine, Bülent Ecevit University, Zonguldak, Turkey
| | - Emir Baki Denkbas
- Department of Chemistry, Biochemistry Division, Hacettepe University, Ankara, Turkey
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8
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Rodik RV, Anthony AS, Kalchenko VI, Mély Y, Klymchenko AS. Cationic amphiphilic calixarenes to compact DNA into small nanoparticles for gene delivery. NEW J CHEM 2015. [DOI: 10.1039/c4nj01395f] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cationic amphiphilic calixarenes with longer alkyl chains are less cytotoxic and their virus-sized DNA nanoparticles exhibit higher transfection efficiency.
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Affiliation(s)
- Roman V. Rodik
- Laboratoire de Biophotonique et Pharmacologie
- UMR 7213 CNRS
- Université de Strasbourg
- Faculté de Pharmacie
- 67401 ILLKIRCH Cedex
| | - Anne-Sophie Anthony
- Laboratoire de Biophotonique et Pharmacologie
- UMR 7213 CNRS
- Université de Strasbourg
- Faculté de Pharmacie
- 67401 ILLKIRCH Cedex
| | - Vitaly I. Kalchenko
- Institute of Organic Chemistry
- National Academy of Science of Ukraine
- Kiev
- Ukraine
| | - Yves Mély
- Laboratoire de Biophotonique et Pharmacologie
- UMR 7213 CNRS
- Université de Strasbourg
- Faculté de Pharmacie
- 67401 ILLKIRCH Cedex
| | - Andrey S. Klymchenko
- Laboratoire de Biophotonique et Pharmacologie
- UMR 7213 CNRS
- Université de Strasbourg
- Faculté de Pharmacie
- 67401 ILLKIRCH Cedex
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9
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Abstract
Plasmid or non-viral gene therapy offers an alternative to classic viral gene delivery that negates the need for a biological vector. In this case, delivery is enhanced by a variety of approaches including lipid or polymer conjugation, particle-mediated delivery, hydrodynamic delivery, ultrasound or electroporation. Electroporation was originally used as a laboratory tool to deliver DNA to bacterial and mammalian cells in culture. Electrode development allowed this technique to be modified for in vivo use. After preclinical therapeutic studies, clinical delivery of cell impermeant chemotherapeutic agents progressed to clinical delivery of plasmid DNA. One huge benefit of this delivery technique is its malleability. The pulse protocol used for plasmid delivery can be fine-tuned to control the levels and duration of subsequent transgene expression. This fine-tuning allows transgene expression to be tailored to each therapeutic application. Effective and appropriate expression induces the desired clinical response that is a critical component for any gene therapy. This chapter focuses on clinical trials using in vivo electroporation or electrotransfer as a plasmid delivery method. The first clinical trial was initiated in 2004, and now more than fifty trials use electric fields for gene delivery. Safety and tolerability has been demonstrated by several groups, and early clinical efficacy results are promising in both cancer therapeutic and infectious disease vaccine applications.
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Affiliation(s)
- Richard Heller
- Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, VA, USA; School of Medical Diagnostics and Translational Sciences, College of Health Sciences, Old Dominion University, Norfolk, VA, USA
| | - Loree C Heller
- Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, VA, USA; School of Medical Diagnostics and Translational Sciences, College of Health Sciences, Old Dominion University, Norfolk, VA, USA
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LIU SAI, XU XIAOPING, ZENG XIN, LI LONGJIANG, CHEN QIANMING, LI JING. Tumor-targeting bacterial therapy: A potential treatment for oral cancer (Review). Oncol Lett 2014; 8:2359-2366. [PMID: 25364397 PMCID: PMC4214492 DOI: 10.3892/ol.2014.2525] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2013] [Accepted: 08/01/2014] [Indexed: 01/30/2023] Open
Abstract
Certain obligate or facultative anaerobic bacteria, which exhibit an inherent ability to colonize solid tumors in vivo, may be used in tumor targeting. As genetically manipulated bacteria may actively and specifically penetrate into the tumor tissue, bacterial therapy is becoming a promising approach in the treatment of tumors. However, to the best of our knowledge, no reports have been published thus far regarding the bacterial treatment of oral cancer, one of the most common types of cancer worldwide. In this review, the progress in the understanding of bacterial strategies used in tumor-targeted therapy is discussed and particular bacterial strains that may have great therapeutic potential in oral squamous cell carcinoma (OSCC) tumor-targeted therapy are predicted as determined by previous studies.
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Affiliation(s)
| | | | - XIN ZENG
- State Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - LONGJIANG LI
- State Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - QIANMING CHEN
- State Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - JING LI
- State Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
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12
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da Silva AL, Martini SV, Abreu SC, Samary CDS, Diaz BL, Fernezlian S, de Sá VK, Capelozzi VL, Boylan NJ, Goya RG, Suk JS, Rocco PRM, Hanes J, Morales MM. DNA nanoparticle-mediated thymulin gene therapy prevents airway remodeling in experimental allergic asthma. J Control Release 2014; 180:125-33. [PMID: 24556417 DOI: 10.1016/j.jconrel.2014.02.010] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 02/01/2014] [Accepted: 02/10/2014] [Indexed: 11/30/2022]
Abstract
Thymulin has been shown to present anti-inflammatory and anti-fibrotic properties in experimental lung diseases. We hypothesized that a biologically active thymulin analog gene, methionine serum thymus factor, delivered by highly compacted DNA nanoparticles may prevent lung inflammation and remodeling in a mouse model of allergic asthma. The DNA nanoparticles are composed of a single molecule of plasmid DNA compacted with block copolymers of poly-L-lysine and polyethylene glycol (CK30PEG), which have been found safe in a human phase I/II clinical trial. Thymulin plasmids were detected in the lungs of ovalbumin-challenged asthmatic mice up to 27days after administration of DNA nanoparticles carrying thymulin plasmids. A single dose of DNA nanoparticles carrying thymulin plasmids prevented lung inflammation, collagen deposition and smooth muscle hypertrophy in the lungs of a murine model of ovalbumin-challenged allergic asthma, leading to improved lung mechanics. In the present model of chronic allergic asthma, highly compacted DNA nanoparticles using thymulin analog gene modulated the inflammatory and remodeling processes improving lung mechanics.
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Affiliation(s)
- Adriana L da Silva
- Laboratory of Pulmonary Investigation, Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil; Laboratory of Cellular and Molecular Physiology, Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Sabrina V Martini
- Laboratory of Cellular and Molecular Physiology, Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Soraia C Abreu
- Laboratory of Pulmonary Investigation, Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Cynthia dos S Samary
- Laboratory of Pulmonary Investigation, Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Bruno L Diaz
- Laboratory of Immunology, Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Sandra Fernezlian
- Department of Pathology, School of Medicine, University of São Paulo, São Paulo, Brazil
| | - Vanessa Karen de Sá
- Department of Pathology, School of Medicine, University of São Paulo, São Paulo, Brazil
| | - Vera Luiza Capelozzi
- Department of Pathology, School of Medicine, University of São Paulo, São Paulo, Brazil
| | - Nicholas J Boylan
- Department of Chemical & Biomolecular Engineering, Johns Hopkins University, Baltimore, USA; The Center for Nanomedicine, Johns Hopkins University School of Medicine, Baltimore, USA
| | - Rodolfo Gustavo Goya
- Institute for Biochemical Research at La Plata (INIBIOLP), and Histology and Embryology, Faculty of Medicine, National University of La Plata, La Plata, Argentina
| | - Jung Soo Suk
- The Center for Nanomedicine, Johns Hopkins University School of Medicine, Baltimore, USA; Department of Ophthalmology, The Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, USA
| | - Patricia R M Rocco
- Laboratory of Pulmonary Investigation, Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Justin Hanes
- Department of Chemical & Biomolecular Engineering, Johns Hopkins University, Baltimore, USA; The Center for Nanomedicine, Johns Hopkins University School of Medicine, Baltimore, USA; Department of Ophthalmology, The Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, USA.
| | - Marcelo M Morales
- Laboratory of Cellular and Molecular Physiology, Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
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Luo Y, Liu J, Wang Y, Su J, Wu Y, Hu G, Gao M, Quan F, Zhang Y. PhiC31 integrase-mediated genomic integration and stable gene expression in the mouse mammary gland after gene electrotransfer. J Gene Med 2013; 15:356-65. [PMID: 24288809 DOI: 10.1002/jgm.2723] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND PhiC31 integrase is capable of conferring long-term transgene expression in various transfected tissues in vivo. In the present study, we investigated the activity of phiC31 integrase in mouse mammary glands. METHODS The normal mouse mammary epithelial cell line HC11 was transfected with FuGENE® HD Transfection Reagent (Roche Diagnostics, Shanghai, China). Transfection of the mouse mammary gland in vivo was performed by electrotransfer. Transgene expression was detected by western blotting and an enzyme-linked immunosorbent assay. Genomic integration and integration at mpsL1 was confirmed by a nested polymerase chain reaction. RESULTS An optimal electrotransfer protocol for the lactating mouse mammary gland was attained through investigation of different voltages and pulse durations. PhiC31 integrase mediated site-specific transgene integration in HC11 cells and the mouse mammary gland. In addition, the site-specific integration occurred efficiently at the ‘hot spot’ mpsL1. Co-delivery of PhiC31 integrase enhanced and prolonged transgene expression in the mouse mammary gland. CONCLUSIONS The results obtained in the present study show that the use of phiC31 integrase is a feasible and efficient method for high and stable transgene expression in the mouse mammary gland.
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14
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Katz MG, Fargnoli AS, Bridges CR. Myocardial gene transfer: routes and devices for regulation of transgene expression by modulation of cellular permeability. Hum Gene Ther 2013; 24:375-92. [PMID: 23427834 DOI: 10.1089/hum.2012.241] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Heart diseases are major causes of morbidity and mortality in Western society. Gene therapy approaches are becoming promising therapeutic modalities to improve underlying molecular processes affecting failing cardiomyocytes. Numerous cardiac clinical gene therapy trials have yet to demonstrate strong positive results and advantages over current pharmacotherapy. The success of gene therapy depends largely on the creation of a reliable and efficient delivery method. The establishment of such a system is determined by its ability to overcome the existing biological barriers, including cellular uptake and intracellular trafficking as well as modulation of cellular permeability. In this article, we describe a variety of physical and mechanical methods, based on the transient disruption of the cell membrane, which are applied in nonviral gene transfer. In addition, we focus on the use of different physiological techniques and devices and pharmacological agents to enhance endothelial permeability. Development of these methods will undoubtedly help solve major problems facing gene therapy.
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Affiliation(s)
- Michael G Katz
- Thoracic and Cardiovascular Surgery, Sanger Heart & Vascular Institute, Carolinas Healthcare System, Charlotte, NC 28203, USA
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15
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Park JH, Kim HA, Park JH, Lee M. Amphiphilic peptide carrier for the combined delivery of curcumin and plasmid DNA into the lungs. Biomaterials 2012; 33:6542-50. [DOI: 10.1016/j.biomaterials.2012.05.046] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Accepted: 05/21/2012] [Indexed: 10/28/2022]
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16
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Heller R, Shirley S, Guo S, Donate A, Heller L. Electroporation based gene therapy--from the bench to the bedside. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2012; 2011:736-8. [PMID: 22254415 DOI: 10.1109/iembs.2011.6090167] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A critical aspect of gene transfer is effective delivery of the transgene to the appropriate target. Electrically mediated delivery (electroporation) of plasmid DNA has been accepted as a viable approach to achieve effective delivery. One promising area is delivering plasmid DNA to skin. Gene transfer to the skin with electroporation is currently being evaluated for its potential for inducing angiogenesis for wound healing and for delivering DNA vaccines to the skin. Experiments utilizing a plasmid encoding for vascular endothelial growth factor has demonstrated how wound healing could be accelerated. In another study, delivery of a plasmid encoding Hepatitis B surface antigen have demonstrated that high antibody titers can be induced after two applications (prime/boost). Our laboratory has also examined the use of electroporation to delivery plasmid DNA encoding various cytokines as a potential therapy for melanoma. The plasmid is injected directly into the tumor followed by the administration of electroporation. Extensive preclinical work provided the rationale for a Phase I proof of concept first in human trial in patients with accessible cutaneous melanoma metastases. Biopsies of treated lesions showed significant necrosis of melanoma cells within the tumor as well as IL-12 expression. Lymphocytic infiltrate was observed in biopsies from patients in several cohorts. Clinical evidence of responses in untreated lesions suggested there was a systemic response following therapy was observed. Since this trial several other clinical studies utilizing electroporation to deliver plasmid DNA have been initiated. It is clear that this delivery approach has tremendous potential to facilitate the translation of gene transfer protocols from the bench to the bedside.
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Affiliation(s)
- Richard Heller
- Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, VA 23508, USA.
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17
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Plasmid DNA is internalized from the apical plasma membrane of the salivary gland epithelium in live animals. Histochem Cell Biol 2012; 138:201-13. [PMID: 22544351 DOI: 10.1007/s00418-012-0959-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/13/2012] [Indexed: 10/28/2022]
Abstract
Non-viral-mediated gene delivery represents an alternative way to express the gene of interest without inducing immune responses or other adverse effects. Understanding the mechanisms by which plasmid DNAs are delivered to the proper target in vivo is a fundamental issue that needs to be addressed in order to design more effective strategies for gene therapy. As a model system, we have used the submandibular salivary glands in live rats and we have recently shown that reporter transgenes can be expressed in different cell populations of the glandular epithelium, depending on the modality of administration of plasmid DNA. Here, by using a combination of immunofluorescence and intravital microscopy, we have explored the relationship between the pattern of transgenes expression and the internalization of plasmid DNA. We found that plasmid DNA is internalized: (1) by all the cells in the salivary gland epithelium, when administered alone, (2) by large ducts, when mixed with empty adenoviral particles, and (3) by acinar cells upon stimulation of compensatory endocytosis. Moreover, we showed that plasmid DNA utilizes different routes of internalization, and evades both the lysosomal degradative pathway and the retrograde pathway towards the Golgi apparatus. This study clearly shows that in vivo approaches have the potential to address fundamental questions on the cellular mechanisms regulating gene delivery.
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Lactose-ornithine bolaamphiphiles for efficient gene delivery in vitro. Int J Pharm 2012; 423:392-400. [DOI: 10.1016/j.ijpharm.2011.12.026] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2011] [Accepted: 12/14/2011] [Indexed: 01/25/2023]
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Takano K, Sato K, Negishi Y, Aramaki Y. Involvement of actin cytoskeleton in macrophage apoptosis induced by cationic liposomes. Arch Biochem Biophys 2011; 518:89-94. [PMID: 22203089 DOI: 10.1016/j.abb.2011.12.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2011] [Revised: 12/09/2011] [Accepted: 12/12/2011] [Indexed: 01/24/2023]
Abstract
We clarified whether actin cytoskeleton is involved in the macrophage apoptosis induced by cationic liposomes composed of stearylamine (SA-liposomes). Externalization of phosphatidylserine induced by SA-liposomes was suppressed by cytochalasin D, a specific inhibitor of polymerization of F-actin. Furthermore, activation of PKCδ and reactive oxygen species (ROS) generation, which could be involved in the macrophage apoptosis, were inhibited by cytochalasin D. Microscopical observation revealed the co-localization of 1,1'-dioctadecyl-3,3,3',3'-tetramethylindocarbocyanine perchlorate (DiI)-labeled SA-liposomes and fluorescein-labeled phalloidin, which specifically binds to F-actin, and this co-localization was also inhibited by cytochalasin D. Co-localization of SA-liposomes and F-actin was also inhibited by the pre-treatment of cells with chondroitinase ABC. These findings could be the first observation concerning the contribution of the proteoglycan-actin cytoskeleton-ROS generation pathway to apoptosis induced by SA-liposomes in macrophages.
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Affiliation(s)
- Katsuki Takano
- Tokyo University of Pharmacy and Life Sciences, Horinouchi, Hachioji, Tokyo, Japan
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Rodik RV, Klymchenko AS, Jain N, Miroshnichenko SI, Richert L, Kalchenko VI, Mély Y. Virus-Sized DNA Nanoparticles for Gene Delivery Based on Micelles of Cationic Calixarenes. Chemistry 2011; 17:5526-38. [DOI: 10.1002/chem.201100154] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2010] [Indexed: 11/07/2022]
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The nuclear localization signal sequence of porcine circovirus type 2 ORF2 enhances intracellular delivery of plasmid DNA. Arch Virol 2011; 156:803-15. [DOI: 10.1007/s00705-011-0920-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2010] [Accepted: 01/12/2011] [Indexed: 12/11/2022]
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Chakravarty P, Qian W, El-Sayed MA, Prausnitz MR. Delivery of molecules into cells using carbon nanoparticles activated by femtosecond laser pulses. NATURE NANOTECHNOLOGY 2010; 5:607-11. [PMID: 20639882 PMCID: PMC2917490 DOI: 10.1038/nnano.2010.126] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2010] [Accepted: 05/21/2010] [Indexed: 05/21/2023]
Abstract
A major barrier to drug and gene delivery is crossing the cell's plasma membrane. Physical forces applied to cells via electroporation, ultrasound and laser irradiation generate nanoscale holes in the plasma membrane for direct delivery of drugs into the cytoplasm. Inspired by previous work showing that laser excitation of carbon nanoparticles can drive the carbon-steam reaction to generate highly controlled shock waves, we show that carbon black nanoparticles activated by femtosecond laser pulses can facilitate the delivery of small molecules, proteins and DNA into two types of cells. Our initial results suggest that interaction between the laser energy and carbon black nanoparticles may generate photoacoustic forces by chemical reaction to create transient holes in the membrane for intracellular delivery.
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Affiliation(s)
- Prerona Chakravarty
- Ph.D. Graduate, School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332,
| | - Wei Qian
- Senior Research Scientist and Assistant Director of the Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology, Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332,
| | - Mostafa A. El-Sayed
- Julius Brown Chair and Regents Professor; Director of the Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology, Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332
| | - Mark R. Prausnitz
- Professor, School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332, , Phone: 404-894-5135, Fax: 404-894-2291
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Xiong YC, Yao YC, Zhan XY, Chen GQ. Application of polyhydroxyalkanoates nanoparticles as intracellular sustained drug-release vectors. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2010; 21:127-40. [PMID: 20040158 DOI: 10.1163/156856209x410283] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Polyhydroxybutyrate (PHB), co-polyesters of 3-hydroxybutyrate and 3-hydroxyhexanoate (PHBHHx), and polylactic acid (PLA) were used to prepare nanoparticles with average sizes of 160, 250 and 150 nm, respectively. A lipid-soluble colorant, rhodamine B isothiocyanate (RBITC), was employed to study drug-release behaviors from these nanoparticles. A high RBITC drug-loading efficiency of over 75% was achieved with all PHA nanoparticles prepared. Macrophage endocytosis led to an intracellular RBITC drug sustained release over a period of at least 20 days for PHB and PHBHHx nanoparticles, while PLA nanoparticles and free drug lasted only 15 days and a week, respectively. Polymer properties and particle sizes showed little effect on drug-release behavior. This study showed for the first time that PHB and PHBHHx can be used effectively to achieve intracellular controlled drug releases.
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Affiliation(s)
- Yu-Cui Xiong
- Multidisciplinary Research Center, Shantou University, Shantou 515063, Guangdong, P. R. China
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Kren BT, Unger GM, Sjeklocha L, Trossen AA, Korman V, Diethelm-Okita BM, Reding MT, Steer CJ. Nanocapsule-delivered Sleeping Beauty mediates therapeutic Factor VIII expression in liver sinusoidal endothelial cells of hemophilia A mice. J Clin Invest 2009; 119:2086-99. [PMID: 19509468 DOI: 10.1172/jci34332] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2007] [Accepted: 04/22/2009] [Indexed: 12/16/2022] Open
Abstract
Liver sinusoidal endothelial cells are a major endogenous source of Factor VIII (FVIII), lack of which causes the human congenital bleeding disorder hemophilia A. Despite extensive efforts, gene therapy using viral vectors has shown little success in clinical hemophilia trials. Here we achieved cell type-specific gene targeting using hyaluronan- and asialoorosomucoid-coated nanocapsules, generated using dispersion atomization, to direct genes to liver sinusoidal endothelial cells and hepatocytes, respectively. To highlight the therapeutic potential of this approach, we encapsulated Sleeping Beauty transposon expressing the B domain-deleted canine FVIII in cis with Sleeping Beauty transposase in hyaluronan nanocapsules and injected them intravenously into hemophilia A mice. The treated mice exhibited activated partial thromboplastin times that were comparable to those of wild-type mice at 5 and 50 weeks and substantially shorter than those of untreated controls at the same time points. Further, plasma FVIII activity in the treated hemophilia A mice was nearly identical to that in wild-type mice through 50 weeks, while untreated hemophilia A mice exhibited no detectable FVIII activity. Thus, Sleeping Beauty transposon targeted to liver sinusoidal endothelial cells provided long-term expression of FVIII, without apparent antibody formation, and improved the phenotype of hemophilia A mice.
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Affiliation(s)
- Betsy T Kren
- Department of Medicine, University of Minnesota Medical School, Minneapolis, Minnesota 55455, USA
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Aneja MK, Geiger JP, Himmel A, Rudolph C. Targeted gene delivery to the lung. Expert Opin Drug Deliv 2009; 6:567-83. [DOI: 10.1517/17425240902927841] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Fu Q, Jia S, Sun Z, Tian F, Du J, Zhou Y, Wang Y, Wang X, Zhan L. φC31 integrase and liver-specific regulatory elements confer high-level, long-term expression of firefly luciferase in mouse liver. Biotechnol Lett 2009; 31:1151-7. [DOI: 10.1007/s10529-009-9996-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2009] [Revised: 03/16/2009] [Accepted: 03/19/2009] [Indexed: 01/28/2023]
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Induced apoptosis with ultrasound-mediated microbubble destruction and shRNA targeting survivin in transplanted tumors. Adv Ther 2009; 26:99-106. [PMID: 19083158 DOI: 10.1007/s12325-008-0129-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2008] [Indexed: 12/13/2022]
Abstract
INTRODUCTION This study was designed to evaluate the consequences of survivin down-modulation on tumor growth in a nude mice model combined with short hairpin RNA recombinant vector (shRNA) and ultrasound-mediated microbubble destruction (UMMD). METHODS BALB/c nude mice were inoculated subcutaneously with cervical cancer cells (HeLa) and tumors (5-10 mm) developed. A shRNA recombinant vector that targeted the survivin gene (survivin-shRNA) was constructed. The mice were divided into three groups (n=6 in each group) and injected with survivin-shRNA: plasmid group (P), plasmid+ultrasound exposure group (P+US), and plasmid+microbubble (SonoVue(R))+ultrasound group (P+UMMD). Protein expression of survivin, proliferating cell nuclear antigen (PCNA), and caspase-3 were investigated by immunohistochemistry, and proliferation index (PI) and apoptotic index (AI) were measured. RESULTS The protein expression of survivin and PCNA was markedly downregulated, while caspase-3 was markedly upregulated in the P+UMMD group as compared with that of the P group and P+US group. PI decreased significantly (P<0.05), whereas AI increased remarkably (P<0.01) in the P+UMMD group as compared with that of the P group and P+US group. These data indicate that the combined strategy of UMMD and survivin-shRNA effectively induces silencing of the survivin gene, resulting in inhibition of proliferation and induction of apoptosis in nude mice. CONCLUSIONS Survivin could be regarded as an ideal target for anticancer intervention of cervical cancer. The combination of shRNA and UMMD could enhance antitumor efficacy as a result of synergism. This may be a powerful, promising non-viral technology that could be used in tumor gene therapy.
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Hecker JG, Berger GO, Scarfo KA, Zou S, Nantz MH. A flexible method for the conjugation of aminooxy ligands to preformed complexes of nucleic acids and lipids. ChemMedChem 2008; 3:1356-61. [PMID: 18666266 DOI: 10.1002/cmdc.200800084] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Attachment of targeted ligands to nonviral DNA or RNA delivery systems is a promising strategy that seeks to overcome the poor target selectivity generally observed in systemic delivery applications. Several methods have been developed for the conjugation of ligands to lipids or polymers, however, direct conjugation of ligands onto lipid- or polymer-nucleic acid complexes is not as straightforward. Here, we examine an oximation approach to directly label a lipoplex formulation. Specifically, we report the synthesis of a cationic diketo lipid DMDK, and its use as a convenient ligation tool for attachment of aminooxy-functionalized reagents after its complexation with DNA. We demonstrate the feasibility of direct lipoplex labeling by attaching an aminooxy-functionalized fluorescent probe onto pre-formed plasmid DNA-DMDK lipoplexes (luciferase, GFP). The results reveal that DMDK protects DNA from degradation on exposure to either DNase or human cerebral spinal fluid, and that simple mixing of DMDK lipoplexes with the aminooxy probe labels the complexes without sacrificing transfection efficiency. The biocompatibility and selectivity of this method, as well as the ease of bioconjugation, make this labeling approach ideal for biological applications.
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Affiliation(s)
- James G Hecker
- Department of Anesthesia and Critical Care, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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A specific drug targeting system based on polyhydroxyalkanoate granule binding protein PhaP fused with targeted cell ligands. Biomaterials 2008; 29:4823-30. [DOI: 10.1016/j.biomaterials.2008.09.008] [Citation(s) in RCA: 116] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2008] [Accepted: 09/02/2008] [Indexed: 12/16/2022]
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Bivalacqua TJ, Strong TD. The use of gene transfer technology to study the pathophysiology of erectile dysfunction. J Sex Med 2008; 5:268-75. [PMID: 18237370 DOI: 10.1111/j.1743-6109.2007.00758.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
INTRODUCTION The past 25 years of basic science research on erectile physiology has been devoted to investigating the pathogenesis of erectile dysfunction. Research has led to a better understanding of the biochemical factors and intracellular mechanisms responsible for corporal smooth muscle contraction and relaxation, as well as the influence of endothelial-derived relaxing factors. AIM In this essay, we propose the use of gene transfer technology to study mechanisms of disease involved in penile vascular dysfunction. METHODS The development of methods to deliver therapeutic genes to the penis has kindled a keen interest in treating ED with gene- and cell-based therapies. RESULTS Gene therapy has delineated putative mechanisms of disease in animal models of erectile dysfunction. CONCLUSION Investigation of animal models using gene therapy may ultimately lead to mechanism-based therapies for the treatment of erectile dysfunction.
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Affiliation(s)
- Trinity J Bivalacqua
- The Brady Urological Institute, Department of Urology, Johns Hopkins Hospital, Baltimore, MD, USA.
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Abstract
Transformations from one tissue type to another make up a well established set of phenomena that can be explained by the principles of developmental biology. Although these phenomena might be rare in nature, we can now imagine the possibility of deliberately reprogramming cells from one tissue type to another by manipulating the expression of transcription factors. This approach could generate new therapies for many human diseases.
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Eller CD, Regelson M, Merriman B, Nelson S, Horvath S, Marahrens Y. Repetitive sequence environment distinguishes housekeeping genes. Gene 2006; 390:153-65. [PMID: 17141428 PMCID: PMC1857324 DOI: 10.1016/j.gene.2006.09.018] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2006] [Revised: 09/18/2006] [Accepted: 09/24/2006] [Indexed: 12/14/2022]
Abstract
Housekeeping genes are expressed across a wide variety of tissues. Since repetitive sequences have been reported to influence the expression of individual genes, we employed a novel approach to determine whether housekeeping genes can be distinguished from tissue-specific genes by their repetitive sequence context. We show that Alu elements are more highly concentrated around housekeeping genes while various longer (>400-bp) repetitive sequences ("repeats"), including Long Interspersed Nuclear Element-1 (LINE-1) elements, are excluded from these regions. We further show that isochore membership does not distinguish housekeeping genes from tissue-specific genes and that repetitive sequence environment distinguishes housekeeping genes from tissue-specific genes in every isochore. The distinct repetitive sequence environment, in combination with other previously published sequence properties of housekeeping genes, was used to develop a method of predicting housekeeping genes on the basis of DNA sequence alone. Using expression across tissue types as a measure of success, we demonstrate that repetitive sequence environment is by far the most important sequence feature identified to date for distinguishing housekeeping genes.
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Affiliation(s)
- C. Daniel Eller
- UCLA Department of Human Genetics David Geffen School of Medicine, Gonda Center, 695 E. Young Drive South, Los Angeles, California 90095-7088, USA
| | - Moira Regelson
- UCLA Department of Human Genetics David Geffen School of Medicine, Gonda Center, 695 E. Young Drive South, Los Angeles, California 90095-7088, USA
| | - Barry Merriman
- UCLA Department of Human Genetics David Geffen School of Medicine, Gonda Center, 695 E. Young Drive South, Los Angeles, California 90095-7088, USA
| | - Stan Nelson
- UCLA Department of Human Genetics David Geffen School of Medicine, Gonda Center, 695 E. Young Drive South, Los Angeles, California 90095-7088, USA
| | - Steve Horvath
- UCLA Department of Human Genetics David Geffen School of Medicine, Gonda Center, 695 E. Young Drive South, Los Angeles, California 90095-7088, USA
- UCLA Department of Biostatistics, School of Public Health, Box 951772, Los Angeles, California 90095-1772, USA
| | - York Marahrens
- UCLA Department of Human Genetics David Geffen School of Medicine, Gonda Center, 695 E. Young Drive South, Los Angeles, California 90095-7088, USA
- * to whom correspondence should be addressed: York Marahrens, UCLA Department of Human Genetics, Gonda Center, Room 4554b, 695 Charles E. Young Drive, Los Angeles, CA 90095, USA, Phone: (310) 267-2466, Fax: (310) 794-5446, E-mail:
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