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  • 1
    Online Resource
    Online Resource
    Lisse :Taylor & Francis Group,
    Keywords: Drug delivery systems. ; Drug targeting. ; Gene therapy. ; Genetic vectors. ; Electronic books.
    Description / Table of Contents: 1. Present and Future Status of Gene Therapy 2. DNA Packaging in Non Viral Systems 3. Biological Barriers to Gene Transfer 4. Therapeutic Applications of Lipid-Based Gene Delivery Systems 5. Polycation-based Delivery Systems for Receptor-Mediated Gene Delivery 6. DNA Delivery Systems Based on Synthetic Peptides 7. Expression Plasmids for Non-Viral Gene Therapy 8. Gene Therapy Clinical Trials for Cystic Fibrosis 9. Polymeric Gene Delivery Systems for In Vivo Gene Therapy 10. Intravascular Delivery of Naked Plasmid DNA 11. Cationic Lipid-Based Gene Delivery Systems 12. Gene-based Vaccines 13. Gene Therapy for Cancer: Strategies and Review of Clinical Trials.
    Type of Medium: Online Resource
    Pages: 1 online resource (300 pages)
    Edition: 1st ed.
    ISBN: 9780203303818
    DDC: 616.042
    Language: English
    Note: BOOK COVER -- HALF-TITLE -- TITLE -- COPYRIGHT -- DEDICATION -- CONTENTS -- PREFACE TO THE SERIES -- PREFACE -- CONTRIBUTORS -- 1. PRESENT AND FUTURE STATUS OF GENE THERAPY -- GENE THERAPY OR GENE DELIVERY? -- GENE THERAPY: A PARADIGM -- THE FUTURE OF GENE THERAPY -- A NOVEL WAY TO TREAT METABOLIC DISEASE -- RETROVIRAL VECTORS, A PROTOTYPIC GENE THERAPY SYSTEM -- DEFECTIVE VIRUSES AND TRANS-COMPLEMENTATION -- IMMUNE RESPONSES: THE BANE OF GENE THERAPY? -- A THIRD UNANTICIPATED PROBLEM: RECEPTOR EXPRESSION -- IMMUNE RESPONSES: A BOON FOR GENE THERAPY? -- WHAT FUTURE FOR GENE THERAPY? -- REFERENCES -- 2. EXPRESSION PLASMIDS FOR NON-VIRAL GENE THERAPY -- INTRODUCTION -- EXPRESSION PLASMID STRUCTURE -- Bacterial Elements -- Mammalian Transcription Unit -- Enhancer/Promoter -- 5′ Untranslated Region -- Intron -- Coding Sequence -- 3′ Untranslated Region -- Poly(A) Signal -- MULTIVALENT EXPRESSION PLASMIDS -- Multiple Transcription Units Per Plasmid -- Multicistronic mRNA (IRES-Dependent Translation) -- Alternative RNA Splicing -- IMMUNOSTIMULATORY SEQUENCES -- PERSISTENCE -- Preventing Promoter Attenuation -- Replication/Nuclear Retention -- Integration -- Immune Response -- TISSUE-SPECIFIC EXPRESSION -- Muscle -- Liver -- Lung -- Tumors -- Inducible Promoters -- DRUG-REGULATED EXPRESSION SYSTEMS -- Tetracycline System -- Rapamycin System -- Antiprogestin System -- CONCLUDING REMARKS -- REFERENCES -- 3. DNA PACKAGING IN NON-VIRAL SYSTEMS -- INTRODUCTION -- ASSEMBLY OF POLYAMINE-DNA COMPLEXES: DNA CONDENSATION -- The Morphology of Polyamine-DNA Complexes -- Phenomenological Models for DNA Condensation by Polyamines -- Quantitative Models for DNA Condensation by Polyamines -- Manning's Counterion Condensation Theory -- The Forces of DNA Condensation -- The Coil-Globule Transition as a Model for DNA Condensation -- A Kinetic Model for DNA Condensation. , DNA PACKAGING BY POLYMER CROWDING EFFECTS -- ASSEMBLY OF LIPID-DNA COMPLEXES -- Internal Model -- Electrostatic Model -- Coated Electrostatic Model -- Spaghetti and Meatball Model -- Mixed Model -- Micellar Aggregate Model -- Hydrophobic Complex Model -- LINC (lipid interactive-non condensing) Structures -- DISCUSSION -- REFERENCES -- 4. BIOLOGICAL BARRIERS TO GENE TRANSFER -- INTRODUCTION -- INTRAVENOUS ADMINISTRATION AND BARRIERS TO EXTRAVASATION -- Biodistribution of Colloidal Systems -- Interactions with Blood Components -- Biodistribution of Gene Delivery Systems -- EPITHELIAL BARRIERS -- BIODISTRIBUTION WITHIN TISSUES -- CELLULAR INTERNALIZATION -- Ligand-mediated Uptake -- INTRACELLULAR BARRIERS -- Escape from the Degradative Pathway -- Transport within the Cytoplasm -- Delivery of DNA to the Nucleus -- REFERENCES -- 5. CATIONIC LIPID-BASED GENE DELIVERY SYSTEMS -- INTRODUCTION -- DNA PLASMID DESIGN, TRANSFECTION AND GENE EXPRESSION -- PHASE BEHAVIOR OF DNA -- CATIONIC LIPIDS AND THEIR PHASE BEHAVIOR -- INTERACTIONS OF CATIONIC LIPIDS AND DNA -- STRUCTURE OF THE COMPLEXES -- GENOSOME PREPARATION -- TRANSFECTION AND GENE EXPRESSION IN VITRO AND IN VIVO -- STRUCTURE ACTIVITY RELATIONSHIPS -- CONCLUSION -- REFERENCES -- 6. THERAPEUTIC APPLICATIONS OF LIPID-BASED GENE DELIVERY SYSTEMS -- INTRODUCTION -- REQUIREMENTS FOR OPTIMAL LIPID-BASED GENE TRANSFER -- Pharmacological Considerations -- Transport from the Site of Administration to Target Tissues or Cells -- Intracellular Factors Influencing Transgene Expression from Lipoplex -- EFFECTS OF FORMULATION OF LIPID-BASED DELIVERY SYSTEMS -- Influence of Formulation -- Biological Stability and Pharmacokinetics -- Organ Specificity of Transgene Expression -- Duration of Transgene Expression -- Toxicity -- SCALE UP CONSIDERATIONS OF LIPID PREPARATIONS -- Shelf Stability -- Preparation and Manufacturing. , THERAPEUTIC APPLICATIONS OF LIPID-BASED SYSTEMS -- CONCLUSION -- REFERENCES -- 7. POLYMERIC GENE DELIVERY SYSTEMS FOR IN VIVO GENE THERAPY -- INTRODUCTION -- POLYVINYLPYRIDINIUM-BASED POLYMERS -- CHITOSAN-BASED SYSTEMS -- HYDROXYLATED NYLONS -- POLYETHYLENIMINES -- DENDRIMERS -- METHACRYLATE-BASED POLYMERS -- PINC SYSTEMS -- GELATIN-BASED SYSTEMS -- SUSTAINED RELEASE POLYMERIC SYSTEMS -- OTHER POLYMERIC SYSTEMS -- CONCLUDING REMARKS -- REFERENCES -- 8. POLYCATION-BASED DELIVERY SYSTEMS FOR RECEPTOR-MEDIATED GENE DELIVERY -- POLYELECTROLYTE REACTION AND VECTOR SELF-ASSEMBLY -- Techniques for Determination of Complex Formation -- TARGETED DELIVERY OF POLYELECTROLYTE DNA COMPLEXES TO SPECIFIC CELLS -- Transferrin-mediated Targeting -- Targeting Using the Asialoglycoprotein Receptor -- Targeting Using Other Ligand Systems -- DELIVERY OF GENES FROM THE ENDOSOME/LYSOSOME INTO THE CYTOPLASM -- Chloroquine and Other Weak Bases -- Poly(ethylene imine) and Starburst™ Dendrimers -- Influenza Virus Hemagglutinin Peptides -- Synergistic Effects of Transfection Agents -- NUCLEAR DELIVERY AND EFFICIENCY OF TRANSCRIPTION -- Direct Intracytoplasmic Injection -- Direct Intranuclear Injection -- SYSTEMIC DELIVERY OF POLYELECTROLYTE COMPLEXES -- Barriers to Successful Systemic Gene Delivery -- Nuclease Degradation of DNA in the Bloodstream -- Activation of the Complement Cascade -- Interaction with Serum Proteins -- In Vitro Analysis of Protein Binding -- Oriented Self-assembly Using Block Copolymers to Inhibit Protein Binding -- CONCLUDING REMARKS -- REFERENCES -- 9. DNA DELIVERY SYSTEMS BASED ON SYNTHETIC PEPTIDES -- INTRODUCTION -- Itinerary of a Non-viral DNA Delivery System -- Why Synthetic Peptides? -- DNA CONDENSING PEPTIDES -- Poly-(L-Lysine) -- Synthetic Cationic Peptides -- Lipophilic Cationic Peptides -- ENDOSOMOLYTIC PEPTIDES. , Influenza HA Variants and JTS-1 -- GALA -- NUCLEAR LOCALIZATION SEQUENCES -- SUMMARY AND PERSPECTIVE -- ACKNOWLEDGEMENTS -- REFERENCES -- 10. GENE-BASED VACCINES -- WHAT ARE GENE-BASED VACCINES? -- OVERVIEW OF IMMUNE RESPONSES TO VACCINES -- WHAT ARE THE SHORTCOMINGS OF ANTIGEN-BASED VACCINES? -- ADVANTAGES OF GENE-BASED VACCINES -- DESIGN AND MECHANISM OF GENE-BASED VACCINES -- Basic Design of Plasmid DNA Vaccines -- Methods of DNA Vaccine Delivery -- Nature and Mechanism of Antigen Presentation and T-Cell Responses -- Nature and Mechanism of Humoral Responses -- POTENTIAL APPLICATIONS FOR GENE-BASED VACCINES -- Prophylactic Vaccination Against Infectious Diseases -- Immunotherapeutic Vaccination for Chronic Infections -- Immunotherapy for Cancer -- OTHER CONSIDERATIONS -- Safety and Regulatory Issues -- Implications for Gene Therapy -- Gene Vaccines as a Research Tool -- REFERENCES -- 11. INTRAVASCULAR DELIVERY OF NAKED PLASMID DNA -- INTRODUCTION -- INTERSTITIAL DELIVERY TO MUSCLE -- INTRAVASCULAR DELIVERY TO MUSCLE -- INTRAVASCULAR DELIVERY TO LIVER -- CONCLUSIONS -- REFERENCES -- 12. GENE THERAPY CLINICAL TRIALS FOR CYSTIC FIBROSIS: VIRAL AND NON-VIRAL APPROACHES -- INTRODUCTION -- THE GOALS OF CF GENE THERAPY -- CF AIRWAY BIOLOGY -- CELLULAR TARGETS IN CF GENE THERAPY -- GENE TRANSFER-HOW MUCH IS ENOUGH? -- IN VIVO PRECLINICAL STUDIES -- VIRAL VECTORS -- Adenovirus -- Adeno-associated Virus (AAV) -- NON-VIRAL DELIVERY SYSTEMS -- PHASE 1 CLINICAL TRIALS: VECTORS AND DOSAGES -- Viral -- Non Viral Delivery Systems -- CRITICAL REVIEW OF RESULTS AND DESIGN -- THE WAY FORWARD -- SUMMARY -- REFERENCE -- 13. GENE THERAPY FOR CANCER: STRATEGIES AND REVIEW OF CLINICAL TRIALS -- INTRODUCTION -- METHODS FOR GENE TRANSFER INTO SOLID TUMORS -- Non-viral or DNA-Mediated Gene Transfer into Solid Tumors -- Viral-Mediated Gene Transfer into Solid Tumors. , Retroviral Vectors -- Pseudotyped Retroviral Vectors -- Adenoviral Vectors -- Second Generation Adenoviral Vectors -- Adeno-associated Viral Vectors (AAV) -- Other Viral Vectors -- GENERAL APPROACHES FOR GENE THERAPY OF SOLID TUMORS -- GENE THERAPY STRATEGIES AND CLINICAL TRIALS FOR SOLID TUMORS -- Drug Sensitivity Genes and "Suicide Genes" -- Herpes Simplex Virus Thymidine Kinase Gene Therapy -- Cytosine Deaminase Gene Therapy -- Drug Sensitivity and Suicide Gene Therapy Clinical Trials -- Immunomodulation Using Gene Therapy -- Cytokine Genes -- Granulocyte-Monocyte Colony Stimulating Factor (GM-CSF) -- Interleukin-2 (IL-2) -- Interleukin-4 (IL4) -- Interleukin-7 (IL-7) -- Interleukin-12 (IL-12) -- Interferon-gamma (INF-g) -- Tumor Necrosis Factor (TNF) -- Introduction of Major Histocompatibility Complex (MHC) Genes -- Co-stimulatory Molecules -- Tumor-Specific Antigens -- Tumor Suppressor and Oncogene Inactivation Gene Therapy -- Oncogene-Targeted Antisense Clinical Trials -- p53 Gene Therapy Clinical Trials -- SUMMARY -- REFERENCES -- INDEX.
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  • 2
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] Tumors require ongoing angiogenesis to support their growth. Inhibition of angiogenesis by production of angiostatic factors should be a viable approach for cancer gene therapy. Endostatin, a potent angiostatic factor, was expressed in mouse muscle and secreted into the bloodstream for up to 2 ...
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature America, Inc.
    Nature biotechnology 17 (1999), S. 26-26 
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] Alain Rolland is Vice President, Research & Development and Head of The Woodlands Center at Valentis, Inc., a publicly traded biologics delivery company formed in March 1999 through the merger of GeneMedicine and Megabios. At Valentis, he leads the company's plasmid therapeutics ...
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] A cationic lipid-based delivery system composed of N [(1-(2,3-dioleyloxy)propyl)]-N,N,N-trimethylammonium chloride (DOTMA) and cholesterol, at a 4:1 mole ratio, was developed to express anti-angiogenic gene products from normal and tumor vasculature upon intravenous administration. Plasmid ...
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-904X
    Keywords: gene delivery system ; gene targeting ; glycopeptide ; hepatocyte ; transfection efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Purpose. To design, synthesize, and test synthetic glycopeptide-baseddelivery systems for gene targeting to hepatocytes by systemicadministration.Methods. All peptides were synthesized by the solid phase methoddeveloped using Fmoc chemistry on a peptide synthesizer. The bindingof galactosylated peptides to HepG2 cells and accessibility of thegalactose residues on particle surface was demonstrated by acompetition assay using 125I-labeleld asialoorosomucoid and RCA lectinagglutination assay, respectively. DNA plasmid encoding chloramphenicolacetyl transferase (CAT) gene was complexed with a tri-galactosylatedpeptide (GM245.3) or tri-galactosylated lipopeptide (GM246.3) in thepresence of an endosomolytic peptide (GM225.1) or endosomolyticlipopeptide (GM227.3) to obtain DNA particles of 100–150 nm insize. The plasmid/peptide complexes were added to HepG2 cell culturesor intravenously administered by tail vein injection into normal miceor rats. Plasmid uptake and expression was quantified by qPCR andELISA, respectively.Results. Multiple antennary glycopeptides that have the ability tocondense and deliver DNA plasmid to hepatocytes were synthesized andcomplexed with DNA plasmid to obtain colloidally stable DNA/peptidecomplexes. Addition of DNA/GM245.3/GM225.1 peptide complexes(1:3:1 (−/+/−)) to HepG2 cell cultures yielded CAT expression intransfected cells. The transfection efficiency was significantly reducedin the absence of galactose ligand or removal of endosomolytic peptide.Intravenous administration of DNA/GM245.3 peptide complexes (1:0.5(−/+)) into the tail vein of normal rats yielded DNA uptake in theliver. Substitution of GM245.3 by galactosylated lipopeptide GM246.3resulted in more stable DNA particles, and a 10-fold enhancement inliver plasmid uptake. CAT expression was detectable in liver followingintravenous administration of DNA/GM246.3 complexes. Addition ofendosomolytic lipopeptide GM227.3 into the complexes(DNA/GM246.3/GM227.3 (1:0.5:1 (−/+/−))) yielded a 5-fold increase inCAT expression. Liver expression was 8-fold and 40-fold higher thanlung and spleen, respectively, and localized in the hepatocytes only.The transfection efficiency in liver was enhanced by increasing DNAdose and injection volume. The plasmid uptake and expression in liverusing DNA/GM246.3/GM227.3 complexes was 100-200-fold higherthan DNA formulated in glucose. Tissue examination and serumbiochemistry did not show any adverse effect of the DNA/GM246.3/GM227.3 (1:0.5:1 (−/+/−)) complexes after intravenous delivery.Conclusions. Gene targeting to hepatocytes was achieved by systemicadministration of a well-tolerated synthetic glycopeptide-baseddelivery system. The transfection efficiency of this glycopeptide deliverysystem was dependent on peptide structure, endosomolytic activity,colloidal particle stability, and injection volume.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1573-904X
    Keywords: pulmonary gene medicine ; plasmid ; aerosol ; ultrasonic nebulization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Purpose. This study relates to the development of gene therapies for the treatment of lung diseases. It describes for the first time the use of ultrasonic nebulization for administration of plasmid/lipid complexes to the lungs to transfect lung epithelial cells. Methods. Plasmid complexed to cationic liposomes at a specific stoichiometric ratio was nebulized using an ultrasonic nebulizer. We assessed: (i) the stability of plasmid and plasmid/lipid complexes to ultrasonic nebulization, (ii) the in vitro activity of plasmid in previously nebulized plasmid/lipid complex, (iii) the in vivo transgene expression in lungs following intratracheal instillation of nebulized plasmid/lipid formulations compared to un-nebulized complexes, (iv) the emitted dose from an ultrasonic nebulizer using plasmid/lipid complexes of different size, and (v) the transgene expression in lungs following oral inhalation of aerosolized plasmid/lipid complex generated using an ultrasonic nebulizer. Results. Integrity of plasmid formulated with cationic lipids, and colloidal stability of the plasmid/lipid complex were maintained during nebulization. In contrast, plasmid alone formulated in 10% lactose was fragmented during nebulization. The efficiency of transfection of the complex before and after nebulization was comparable. Nebulization produced respirable aerosol particles. Oral exposure of rodents for 10 minutes to aerosol produced from the ultrasonic nebulizer resulted in transgene expression in lungs in vivo. Conclusions. The performance characteristics of the ultrasonic nebulizer with our optimized plasmid/lipid formulations suggests that this device can potentially be used for administering gene medicines to the airways in clinical settings for the treatment of respiratory disorders.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1573-904X
    Keywords: flow-through diffusion cell ; topical drug delivery system ; in vitro drug release ; naphthoic acid derivative ; synthetic membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An automated flow-through diffusion cell apparatus was used for comparing the release rates of a naphthoic acid derivative, CD 271, from different topical formulations. The influence of the following parameters on CD 271 release from the formulations was investigated: receptor fluid composition, occlusion, weight of tested formulation, and dosage form type. The amount of tested formulation was shown to have no significant effect on the apparent release constant and lag time for an anionic oil-in-water emulsion and an aqueous gel. Occlusion affected drug release from the different dosage forms. Thus, occlusion increased CD 271 pharmaceutical availability for a lotion and a hydroalcoholic gel containing 0.1% of sol-ubilized drug. The release profile of CD 271 from the formulations was highly dependent on the receptor fluid composition. Drug release was dramatically enhanced with n-octanol as compared to an aqueous solution of surfactant. Using occlusive or nonocclusive procedures, CD 271 apparent release constant and lag time were found to be highly dependent on the type of tested formulation. The flow-through diffusion cell proposed in the present study allows an accurate comparison of drug release characteristics from prototype topical formulations and therefore represents a valuable tool for formulation research or quality control process.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Pharmaceutical research 12 (1995), S. 1435-1438 
    ISSN: 1573-904X
    Keywords: surface tension ; micelles ; block copolymers ; phagocytosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Purpose. This work was carried out to determine the surface tension of block copolymer micelles of 14C labelled ABA poly (oxyethylene-bi-isoprene-b-oxyethylene) which have a long circulating half life in animals. Methods. The method used was that of phagocytosis. The percentage of micelles phagocytosed by human mononuclear cells was determined in solutions of different surface tension. Results. The values obtained were 72 mN/m which may be predicted for a particle with a long circulating half life in animals. The method also gave an estimate of the surface tension for the mononuclear cells. Conclusions. This technique has the advantage of determining the surface tension of highly hydrated small particles including stable micelles in an environment similar to that in which they normally exist.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Pharmaceutical research 14 (1997), S. 853-859 
    ISSN: 1573-904X
    Keywords: non-viral gene delivery ; plasmid ; cationic liposomes ; formulation ; transfection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Gene delivery systems are designed to control the location of administered therapeutic genes within a patient's body. Successful in vivo gene transfer may require (i) the condensation of plasmid and its protection from nuclease degradation, (ii) cellular interaction and internalization of condensed plasmid, (iii) escape of plasmid from endosomes (if endocytosis is involved), and (iv) plasmid entry into cell nuclei. Expression plasmids encoding a therapeutic protein can be, for instance, complexed with cationic liposomes or micelles in order to achieve effective in vivo gene transfer. A thorough knowledge of pharmaceutics and drug delivery, bio-engineering, as well as cell and molecular biology is required to design optimal systems for gene therapy. This mini-review provides a critical discussion on cationic lipid-based gene delivery systems and their possible uses as pharmaceuticals.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1573-904X
    Keywords: muscle ; genetic vaccines ; immune response ; polyvinylpyrrolidone ; growth hormone ; and needle-free injection device
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Purpose. A plasmid-based gene expression system was complexed with protective, interactive, and non-condensing (PINC™) polymer system and administered with Medi-Jector™, a needle-free injection device (NFID), to achieve high and sustained levels of antigen-specific antibodies in blood circulation. Methods. Human growth hormone (hGH) or bacterial β-galactosidase gene expression plasmids driven by a cytomegalovirus (CMV) promoter were formulated in saline or complexed with a PINC polymer, polyvinylpyrrolidone (PVP), and intramuscularly or subcutaneously administered into dogs and pigs using a 22-gauge needle or a NFID. The hGH-specific IgG titers in serum were measured by an ELISA. β-galactosidase expression was measured in injected muscles by an enzymatic assay or immunohistochemistry. The effect of NFID on DNA stability and topology was assessed by gel electrophoresis. Results. Intramuscular (i.m.) or subcutaneous (s.c.) injection of a hGH expression plasmid pCMV-hGH (0.05-0.5 mg/kg) in dogs and pigs elicited antigen-specific IgG antibody titers to expressed hGH. With both routes of injection, pDNA delivery by a NFID was superior to pDNA injection by needle. The magnitude of hGH-specific IgG titers with NFID was 15−20-fold higher than needle injection when pDNA was complexed with PVP, and only 3−4-fold higher with pDNA in saline. The transfection efficiency in the injected muscle, as measured by β-galaclosidase expression, following i.m. injection of pCMV-β-galaclosidase/PVP, was not significantly different between needle and NFID-injected groups. Conclusions. These data demonstrate that the combination of pDNA/ PVP complexes and a NFID act synergistically to achieve high and sustained levels of antigen-specific IgG response to expressed antigen. This gene delivery approach may offer advantage over needle injection of naked DNA for the development of genetic vaccines.
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