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Malkawi WI, Laird NZ, Phruttiwanichakun P, Mohamed E, Elangovan S, Salem AK. Application of Lyophilized Gene-Delivery Formulations to Dental Implant Surfaces: Non-Cariogenic Lyoprotectant Preserves Transfection Activity of Polyplexes Long-Term. J Pharm Sci 2023; 112:83-90. [PMID: 36372226 PMCID: PMC9772140 DOI: 10.1016/j.xphs.2022.11.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 11/04/2022] [Accepted: 11/04/2022] [Indexed: 11/13/2022]
Abstract
Titanium is the metal of choice for dental implants because of its biocompatibility and ability to merge with human bone tissue. Despite the great success rate of dental implants, early and late complications occur. Coating titanium dental implant surfaces with polyethyleneimine (PEI)-plasmid DNA (pDNA) polyplexes improve osseointegration by generating therapeutic protein expression at the implantation site. Lyophilization is an approach for stabilizing polyplexes and extending their shelf life; however, most lyoprotectants are sugars that can aid bacterial growth in the peri-implant environment. In our research, we coated titanium surfaces with polyplex solutions containing varying amounts of lyoprotectants. We used two common lyoprotectants (sucrose and polyvinylpyrrolidone K30) and showed for the first time that sucralose (a sucrose derivative used as an artificial sweetener) might act as a lyoprotectant for polyplex solutions. Human embryonic kidney (HEK) 293T cells were used to quantify the transfection efficiency and cytotoxicity of the polyplex/lyoprotectant formulations coating titanium surfaces. Polyplexes that were lyophilized in the presence of a lyoprotectant displayed both preserved particle size and high transfection efficiencies. Polyplexes lyophilized in 2% sucralose have maintained transfection efficacy for three years. These findings suggest that modifying dental implants with lyophilized polyplexes might improve their success rate in the clinic.
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Affiliation(s)
- Walla I Malkawi
- Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy, University of Iowa, Iowa City, IA, 52242, United States
| | - Noah Z Laird
- Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy, University of Iowa, Iowa City, IA, 52242, United States
| | - Pornpoj Phruttiwanichakun
- Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy, University of Iowa, Iowa City, IA, 52242, United States
| | - Esraa Mohamed
- Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy, University of Iowa, Iowa City, IA, 52242, United States
| | - Satheesh Elangovan
- Department of Periodontics, College of Dentistry and Dental Clinics, The University of Iowa, Iowa City, IA, 52242, United States
| | - Aliasger K Salem
- Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy, University of Iowa, Iowa City, IA, 52242, United States.
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2
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Santhanes D, Wilkins A, Zhang H, John Aitken R, Liang M. Microfluidic formulation of lipid/polymer hybrid nanoparticles for plasmid DNA (pDNA) delivery. Int J Pharm 2022; 627:122223. [PMID: 36155792 DOI: 10.1016/j.ijpharm.2022.122223] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 09/03/2022] [Accepted: 09/18/2022] [Indexed: 11/27/2022]
Abstract
Lipid/polymer hybrid nanoparticles loaded with red fluorescent protein (RFP) encoded plasmid DNA (pDNA) was formulated using poly-lactic-co-glycolic acid (PLGA), cationic lipid DC-cholesterol and surfactant mPEG2000- DSPE. A lipid/ polymer ratio of 1: 10 at 1 mg/mL surfactant concentration was found to be optimal for producing nanoparticles with diameters of 100-120 nm that remained stable upon ultracentrifugation. The production of lipid/ polymer hybrid nanoparticles was investigated using microfluidics with a toroidal mixer design. Our results showed that the flow parameters significantly influenced the physicochemical characteristics of nanoparticles and loading of pDNA was only achieved at flow rate ratio (FRR) of 3: 1. The pDNA associated with nanoparticles was demonstrated to be structurally intact using gel electrophoresis, and the encapsulation efficiency (EE) was measured to be ∼65%. The prepared hybrid nanoparticles resulted in 20% of transfection efficacy in human embryonic kidney cells (HEK293T). This study demonstrated the potential of microfluidics in the development of hybrid nanoparticles for pDNA delivery, thus facilitating the clinical translation of DNA therapeutics.
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Affiliation(s)
- Diviya Santhanes
- School of Biomedical Sciences and Pharmacy, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Alex Wilkins
- Priority Research Centre for Reproductive Science, School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Huiming Zhang
- Electron Microscopy and X-ray Unit, Research and Innovation Division, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Robert John Aitken
- Priority Research Centre for Reproductive Science, School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Mingtao Liang
- School of Biomedical Sciences and Pharmacy, University of Newcastle, Callaghan, NSW 2308, Australia.
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3
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Ariyadasa S, Daear W, Abeysekera G, Billington C, Fee C, Prenner E, Pang L. Evaluation of Biopolymer Materials and Synthesis Techniques to Develop a Rod-Shaped Biopolymer Surrogate for Legionella pneumophila. Polymers (Basel) 2022; 14:polym14132571. [PMID: 35808617 PMCID: PMC9269393 DOI: 10.3390/polym14132571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 06/16/2022] [Accepted: 06/21/2022] [Indexed: 11/22/2022] Open
Abstract
Biopolymer microparticles have been developed for applications that require biocompatibility and biodegradability, such as drug delivery. In this study, we assessed the production of microparticles using carnauba wax, κ-carrageenan, alginate, and poly (lactic-co-glycolic acid) (PLGA) with the aim of developing a novel, DNA-tracer-loaded, biopolymer surrogate with a size, shape, surface charge, and relative hydrophobicity similar to stationary-phase Legionella pneumophila to mimic the bacteria’s mobility and persistence in engineered water systems. We found that the type and concentration of biopolymer, reaction conditions, and synthesis methods affected the morphology, surface charge, relative hydrophobicity, and DNA tracer loading efficiency of the biopolymer microparticles produced. Carnauba wax, κ-carrageenan, and alginate (Protanal®, and low and medium viscosity) produced highly polydisperse microspheres. In contrast, PLGA and alginate-CaCO3 produced uniform microspheres and rod-shaped microparticles, respectively, with high DNA tracer loading efficiencies (PLGA 70% and alginate-CaCO3 95.2 ± 5.7%) and high reproducibilities. Their synthesis reproducibility was relatively high. The relative hydrophobicity of PLGA microspheres closely matched the cell surface hydrophobicity of L. pneumophila but not the bacterial morphology, whereas the polyelectrolyte layer-by-layer assembly was required to enhance the relative hydrophobicity of alginate-CaCO3 microparticles. Following this surface modification, alginate-CaCO3 microparticles represented the best match to L. pneumophila in size, morphology, surface charge, and relative hydrophobicity. This new biopolymer surrogate has the potential to be used as a mimic to study the mobility and persistence of L. pneumophila in water systems where the use of the pathogen is impractical and unsafe.
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Affiliation(s)
- Sujani Ariyadasa
- Institute of Environmental Science and Research, P.O. Box 29181, Christchurch 8540, New Zealand; (G.A.); (C.B.); (L.P.)
- School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8041, New Zealand
- Correspondence: ; Tel.: +64-3351-6019
| | - Weiam Daear
- Department of Biological Sciences, University of Calgary, Calgary, AB T2N 1N4, Canada; (W.D.); (E.P.)
| | - Gayan Abeysekera
- Institute of Environmental Science and Research, P.O. Box 29181, Christchurch 8540, New Zealand; (G.A.); (C.B.); (L.P.)
| | - Craig Billington
- Institute of Environmental Science and Research, P.O. Box 29181, Christchurch 8540, New Zealand; (G.A.); (C.B.); (L.P.)
| | - Conan Fee
- School of Product Design, University of Canterbury, Private Bag 4800, Christchurch 8041, New Zealand;
- Biomolecular Interaction Centre, University of Canterbury, Private Bag 4800, Christchurch 8041, New Zealand
| | - Elmar Prenner
- Department of Biological Sciences, University of Calgary, Calgary, AB T2N 1N4, Canada; (W.D.); (E.P.)
| | - Liping Pang
- Institute of Environmental Science and Research, P.O. Box 29181, Christchurch 8540, New Zealand; (G.A.); (C.B.); (L.P.)
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4
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Optimizing Zinc-HisTag Coordination Remote Loading of Proteins in PLGA Microspheres. Int J Pharm 2022; 623:121889. [PMID: 35671852 DOI: 10.1016/j.ijpharm.2022.121889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 05/18/2022] [Accepted: 05/31/2022] [Indexed: 11/20/2022]
Abstract
Metal-HisTag coordination remote loading (MHCRL) of proteins in PLGA microspheres was previously developed to provide a useful tool for discovery and preclinical development of controlled release protein formulations. Here we describe optimization of MHCRL, including (1) reducing thermal stress, (2) decreasing the complexity and duration of the procedure, (3) increasing loading capacity, (4) increasing the penetration depth of protein, and (5) improving the release profile. Directly encapsulating ZnCO3as a Zn2+source for HisTag coordination, rather than remotely loading Zn2+, increased the Zn content ∼6-fold. Microspheres with directly encapsulated ZnCO3more deeply encapsulated green fluorescent protein and more efficiently encapsulated human serum albumin at protein loading solutions concentrations ≥ 100 μg/mL than remotely loaded Zn2+microspheres. Tributyl acetylcitrate plasticized microspheres in terms of decreasingTg, but led to a decrease in protein encapsulation efficiency. As such, the plasticizer was not deemed useful. The loading/healing cycles were reduced in time and temperature from 48h/42h at 43°C to 2h/6h at 37°C while maintaining strong encapsulation efficiency, resulting in significantly improved protein stability. Immunoreactive protein was slowly released for months following a modest burst release. The improved microspheres and shorter, low-temperature encapsulation could be a valuable asset to drug discovery scientists interested in controlled release of delicate and/or costly biologic candidates.
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5
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Albert J, Chang RS, Garcia GA, Schwendeman SP. Metal‐HisTag
Coordination for Remote Loading of Very Small Quantities of Biomacromolecules into
PLGA
Microspheres. Bioeng Transl Med 2021; 7:e10272. [PMID: 35600641 PMCID: PMC9115689 DOI: 10.1002/btm2.10272] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 11/14/2021] [Accepted: 11/16/2021] [Indexed: 11/19/2022] Open
Abstract
Challenges to discovery and preclinical development of long‐acting release systems for protein therapeutics include protein instability, use of organic solvents during encapsulation, specialized equipment and personnel, and high costs of proteins. We sought to overcome these issues by combining remote‐loading self‐healing encapsulation with binding HisTag protein to transition metal ions. Porous, drug‐free self‐healing microspheres of copolymers of lactic and glycolic acids with high molecular weight dextran sulfate and immobilized divalent transition metal (M2+) ions were placed in the presence of proteins with or without HisTags to bind the protein in the pores of the polymer before healing the surface pores with modest temperature. Using human serum albumin, insulin‐like growth factor 1, and granulocyte‐macrophage colony‐stimulating factor (GM‐CSF), encapsulated efficiencies of immunoreactive protein relative to nonencapsulation protein solutions increased from ~41%, ~23%, and ~9%, respectively, without Zn2+ and HisTags to ~100%, ~83%, and ~75% with Zn2+ and HisTags. These three proteins were continuously released in immunoreactive form over seven to ten weeks to 73%–100% complete release, and GM‐CSF showed bioactivity >95% relative to immunoreactive protein throughout the release interval. Increased encapsulation efficiencies were also found with other divalent transition metals ions (Co2+, Cu2+, Ni2+, and Zn2+), but not with Ca2+. Ethylenediaminetetraacetic acid was found to interfere with this process, reverting encapsulation efficiency back to Zn2+‐free levels. These results indicate that M2+‐immobilized self‐healing microspheres can be prepared for simple and efficient encapsulation by simple mixing in aqueous solutions. These formulations provide slow and continuous release of immunoreactive proteins of diverse types by using a amount of protein (e.g., <10 μg), which may be highly useful in the discovery and early preclinical development phase of new protein active pharmaceutical ingredients, allowing for improved translation to further development of potent proteins for local delivery.
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Affiliation(s)
- Jason Albert
- Department of Pharmaceutical Sciences and the Biointerfaces Institute University of Michigan 2800 Plymouth Rd Ann Arbor MI USA
| | - Rae Sung Chang
- Department of Pharmaceutical Sciences and the Biointerfaces Institute University of Michigan 2800 Plymouth Rd Ann Arbor MI USA
| | - George A. Garcia
- Department of Medicinal Chemistry University of Michigan 2800 Plymouth Rd Ann Arbor MI USA
| | - Steven P. Schwendeman
- Department of Pharmaceutical Sciences and the Biointerfaces Institute University of Michigan 2800 Plymouth Rd Ann Arbor MI USA
- Department of Biomedical Engineering University of Michigan 2800 Plymouth Rd Ann Arbor MI USA
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6
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Estabrook DA, Day RA, Sletten EM. Redox-Responsive Gene Delivery from Perfluorocarbon Nanoemulsions through Cleavable Poly(2-oxazoline) Surfactants. Angew Chem Int Ed Engl 2021; 60:17362-17367. [PMID: 33930255 PMCID: PMC8319079 DOI: 10.1002/anie.202102413] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 04/20/2021] [Indexed: 12/19/2022]
Abstract
The clinical utility of emulsions as delivery vehicles is hindered by a dependence on passive release. Stimuli-responsive emulsions overcome this limitation but rely on external triggers or are composed of nanoparticle-stabilized droplets that preclude sizes necessary for biomedical applications. Here, we employ cleavable poly(2-oxazoline) diblock copolymer surfactants to form perfluorocarbon (PFC) nanoemulsions that release cargo upon exposure to glutathione. These surfactants allow for the first example of redox-responsive nanoemulsions in cellulo. A noncovalent fluorous tagging strategy is leveraged to solubilize a GFP plasmid inside the PFC nanoemulsions, whereupon protein expression is achieved selectively when employing a stimuli-responsive surfactant. This work contributes a methodology for non-viral gene delivery and represents a general approach to nanoemulsions that respond to endogenous stimuli.
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Affiliation(s)
- Daniel A Estabrook
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young, Dr. E., Los Angeles, CA, 90095, USA
| | - Rachael A Day
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young, Dr. E., Los Angeles, CA, 90095, USA
| | - Ellen M Sletten
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young, Dr. E., Los Angeles, CA, 90095, USA
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7
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Estabrook DA, Day RA, Sletten EM. Redox‐Responsive Gene Delivery from Perfluorocarbon Nanoemulsions through Cleavable Poly(2‐oxazoline) Surfactants. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202102413] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Daniel A. Estabrook
- Department of Chemistry and Biochemistry University of California, Los Angeles 607 Charles E. Young, Dr. E. Los Angeles CA 90095 USA
| | - Rachael A. Day
- Department of Chemistry and Biochemistry University of California, Los Angeles 607 Charles E. Young, Dr. E. Los Angeles CA 90095 USA
| | - Ellen M. Sletten
- Department of Chemistry and Biochemistry University of California, Los Angeles 607 Charles E. Young, Dr. E. Los Angeles CA 90095 USA
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8
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Lu XA, He T, Han Z, Ding Y, Zhao L, Liu G, De Smet F, Huang X, Chen D, Qi F, Zhao X. Production of lentiviral vectors in suspension cells using low proportion of supercoiled circular plasmid DNA. Cytotechnology 2020; 72:10.1007/s10616-020-00433-4. [PMID: 33123933 PMCID: PMC7695760 DOI: 10.1007/s10616-020-00433-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Accepted: 10/16/2020] [Indexed: 10/23/2022] Open
Abstract
The supercoiled circular (SC) topology form of plasmid DNA has been regarded to be advantageous over open circular or linearized analogue in transfection and expression efficiency, and therefore are largely demanded in the biopharmaceutical manufacturing. However, production of high-purity SC plasmid DNA would result in high manufacturing cost. The effect of SC proportion in plasmid DNA on the quality of packaged lentiviral vectors has never been reported. In this study, we established an efficient system for production of high-titer lentiviral vectors using suspension HEK293SF cells in serum-free media, and the lentiviral titer was not associated with the proportion of SC plasmid DNA. Plasmids DNA with different proportion of SC, open-circular, and linearized forms were prepared using the thermal denaturation method, and were transfected to adherent HEK293T or suspension HEK293SF cells for packaging of lentiviral vectors. The titer of lentiviral vectors from HEK293T cells, but not from HEK293SF cells, was significantly impaired when the proportion of SC plasmid DNA decreased from 60-80% to 30-40%. Further decrease of SC plasmid proportion to 3% led to a dramatic reduction of lentiviral titer no matter the packaging cell line was. However, lentiviral vectors from HEK293SF cells still showed a high titer even when the proportion of SC plasmid DNA was 3%. This study demonstrated that extremely high proportion of SC plasmid DNA was not required for packaging of high-titer lentiviral vector in HEK293SF cells, at least under our manufacturing process.
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Affiliation(s)
- Xin-An Lu
- Immunochina Pharmaceuticals Co., Ltd, 100089, Beijing, China
| | - Ting He
- Immunochina Pharmaceuticals Co., Ltd, 100089, Beijing, China
| | - Zhihai Han
- Department of Pulmonary and Critical Care Medicine, The Sixth Medical Center of PLA General Hospital, 100048, Beijing, China
| | - Yanping Ding
- Immunochina Pharmaceuticals Co., Ltd, 100089, Beijing, China
| | - Liang Zhao
- Immunochina Pharmaceuticals Co., Ltd, 100089, Beijing, China
| | - Guanghua Liu
- Immunochina Pharmaceuticals Co., Ltd, 100089, Beijing, China
| | - Floris De Smet
- Sartorius Stedim North America Inc., 565 Johnson Avenue, Bohemia, New York, 11716, USA
| | - Xiaojun Huang
- Peking University People's Hospital, Peking University Institute of Hematology, National Clinical Research Center for Hematologic Disease, Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, No. 11 South Street of Xizhimen, Xicheng District, 100044, Beijing, China
| | - Danqing Chen
- Immunochina Pharmaceuticals Co., Ltd, 100089, Beijing, China
| | - Feifei Qi
- Immunochina Pharmaceuticals Co., Ltd, 100089, Beijing, China.
| | - Xiangyu Zhao
- Peking University People's Hospital, Peking University Institute of Hematology, National Clinical Research Center for Hematologic Disease, Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, No. 11 South Street of Xizhimen, Xicheng District, 100044, Beijing, China.
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9
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Malik S, Lim J, Slack FJ, Braddock DT, Bahal R. Next generation miRNA inhibition using short anti-seed PNAs encapsulated in PLGA nanoparticles. J Control Release 2020; 327:406-419. [PMID: 32835710 DOI: 10.1016/j.jconrel.2020.08.026] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 08/14/2020] [Accepted: 08/17/2020] [Indexed: 02/07/2023]
Abstract
Selective inhibition of microRNAs (miRNAs) offers a new avenue for cancer therapeutics. While most of the current anti-miRNA (antimiR) reagents target full length miRNAs, here we investigate novel nanoparticle-delivered short PNA probes containing cationic domains targeting the seed region of the miRNA for effective antimiR therapy. For proof of concept, we tested PNAs targeting miRNA-155 and employed poly(lactic-co-glycolic acid) (PLGA)-based nanoparticle formulation for delivery. A comprehensive evaluation of PLGA nanoparticles (NPs) containing short PNA probes showed significantly superior loading, release profile, and uniform size distribution, compared to conventional non-cationic PNA probes. Confocal microscopy and flow cytometry analyses showed efficient transfection efficiency and uniform distribution of PLGA NPs containing short PNA probes in the cytoplasm. Functional analysis also confirmed efficient miRNA-155 inhibition including an effect on its downstream target proteins. Further, reduced tumor growth was observed after systemic delivery of PLGA nanoparticles containing short PNA probes in vivo in a xenograft mouse model following inhibition of miR-155. There was no evidence of acute or chronic toxicity associated with systemic delivery of PLGA NPs containing short PNA probes in the mice. Overall, in this paper we present a novel antimiR strategy based on PLGA nanoparticle delivered short PNA probes for potential cancer therapy.
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Affiliation(s)
- Shipra Malik
- Department of Pharmaceutical Sciences, University of Connecticut, Storrs, CT 06269, USA
| | - Jihoon Lim
- Department of Pathology, BIDMC Cancer Center, Harvard Medical School, 330, Brookline Ave, Boston, MA 02215, USA
| | - Frank J Slack
- Department of Pathology, BIDMC Cancer Center, Harvard Medical School, 330, Brookline Ave, Boston, MA 02215, USA
| | - Demetrios T Braddock
- Department of Pathology, Yale University School of Medicine, 310 Cedar Street, New Haven, CT 06510, USA
| | - Raman Bahal
- Department of Pharmaceutical Sciences, University of Connecticut, Storrs, CT 06269, USA.
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10
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Aldawsari HM, Fahmy UA, Abd-Allah F, Ahmed OAA. Formulation and Optimization of Avanafil Biodegradable Polymeric Nanoparticles: A Single-Dose Clinical Pharmacokinetic Evaluation. Pharmaceutics 2020; 12:E596. [PMID: 32604853 PMCID: PMC7356025 DOI: 10.3390/pharmaceutics12060596] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 06/22/2020] [Accepted: 06/23/2020] [Indexed: 12/22/2022] Open
Abstract
Avanafil (AVA) is a second-generation phosphodiesterase-5 (PDE5) inhibitor. AVA shows high selectivity to penile tissues and fast absorption, but has a bioavailability of about 36%. The aim was to formulate and optimize AVA-biodegradable nanoparticles (NPs) to enhance AVA bioavailability. To assess the impact of variables, the Box-Behnken design was utilized to investigate and optimize the formulation process variables: the AVA:poly (lactic-co-glycolic acid) (PLGA) ratio (w/w, X1); sonication time (min, X2); and polyvinyl alcohol (PVA) concentration (%, X3). Particle size (nm, Y1) and EE% (%, Y2) were the responses. The optimized NPs were characterized for surface morphology and permeation. Furthermore, a single-oral dose (50 mg AVA) pharmacokinetic investigation on healthy volunteers was carried out. Statistical analysis revealed that all the investigated factors exhibited a significant effect on the particle size. Furthermore, the entrapment efficiency (Y2) was significantly affected by both the AVA:PLGA ratio (X1) and PVA concentration (X3). Pharmacokinetic data showed a significant increase in the area under the curve (1.68 folds) and plasma maximum concentration (1.3-fold) for the AVA NPs when compared with raw AVA. The optimization and formulation of AVA as biodegradable NPs prepared using solvent evaporation (SE) proves a successful way to enhance AVA bioavailability.
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Affiliation(s)
- Hibah M. Aldawsari
- Department of Pharmaceutics, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia; (U.A.F.); (O.A.A.A.)
| | - Usama A. Fahmy
- Department of Pharmaceutics, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia; (U.A.F.); (O.A.A.A.)
| | - Fathy Abd-Allah
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Al-Azhar University, Cairo 11865, Egypt;
| | - Osama A. A. Ahmed
- Department of Pharmaceutics, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia; (U.A.F.); (O.A.A.A.)
- Department of Pharmaceutics & Industrial Pharmacy, Faculty of Pharmacy, Minia University, Minia 61111, Egypt
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11
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Polylactide-Based Reactive Micelles as a Robust Platform for mRNA Delivery. Pharm Res 2020; 37:30. [PMID: 31915939 DOI: 10.1007/s11095-019-2749-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 12/07/2019] [Indexed: 01/09/2023]
Abstract
PURPOSE mRNA has recently emerged as a potent therapeutics and requires safe and effective delivery carriers, particularly prone to address its issues of poor stability and escape from endosomes. In this context, we designed poly(D,L-lactide) (PLA)-based micelles with N-succinimidyl (NS) ester decorated hydrophilic hairy corona to trap/couple a cationic fusogenic peptide and further complex mRNA. METHODS Two strategies were investigated, namely (i) sequential immobilization of peptide and mRNA onto the micelles (layer-by-layer, LbL) or (ii) direct immobilization of peptide-mRNA pre-complex (PC) on the micelles. After characterization by means of size, surface charge, peptide/mRNA coupling/complexation and mRNA serum stability, carrier cytotoxicity and transfection capacity were evaluated with dendritic cells (DCs) using both GFP and luciferase mRNAs. RESULTS Whatever the approach used, the micellar assemblies afforded full protection of mRNA in serum while the peptide-mRNA complex yielded complete mRNA degradation. In addition, the micellar assemblies allowed to significantly reduce the toxicity observed with the peptide-mRNA complex. They successfully transfected hard-to transfect DCs, with a superior efficiency for the LbL made ones (whatever mRNAs studied) showing the impact of the elaboration process on the carrier properties. CONCLUSIONS These results show the relevance and potential of this new PLA/peptide based micelle platform to improve mRNA stability and delivery, while offering the possibility of further multifunctionality through PLA core encapsulation.
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12
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Lu Y, Wu F, Duan W, Mu X, Fang S, Lu N, Zhou X, Kong W. Engineering a “PEG-g-PEI/DNA nanoparticle-in- PLGA microsphere” hybrid controlled release system to enhance immunogenicity of DNA vaccine. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 106:110294. [DOI: 10.1016/j.msec.2019.110294] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 09/18/2019] [Accepted: 10/07/2019] [Indexed: 12/31/2022]
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13
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Zupanič Pajnič I, Marrubini G, Pogorelc BG, Zupanc T, Previderè C, Fattorini P. On the long term storage of forensic DNA in water. Forensic Sci Int 2019; 305:110031. [PMID: 31707238 DOI: 10.1016/j.forsciint.2019.110031] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 10/21/2019] [Accepted: 10/28/2019] [Indexed: 11/19/2022]
Abstract
A rectrospective study was conducted on the effect of the long term storage of 122 DNA samples resuspended in water, one of the elution media still suggested by well established protocols. These DNA samples come from four different kinds of forensically relevant samples (saliva swabs, FTA card bloodstains, nails and II° World War bones) extracted in 2008-2018 and stored at - 20°C (n=113 of groups #1-#5) and at +4°C (n=9 of the group #6), respectively. At the time of the present study (2019), quantitative PCR (qPCR) was employed as tool for assessing the degradation of the samples. The employment of the Human Quantifiler Kit showed that the median loss of DNA ranged from 17.8% to 66.6% in groups #1-#5 while it was 85.0% in group #6. However, it is likely that these values represent an underestimation due to the shortness of the qPCR probe (62 bp). Noteworthy, the DNA loss was statistically significant in each of the six groups (p values ≤ 0.0167). Thus, in agreement with the data on spontaneous DNA decay, no forensic DNA sample should be stored in water for long term periods. In conclusion, the results of this technical note warn against the use of water for this purpose.
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Affiliation(s)
- Irena Zupanič Pajnič
- Institute of Forensic Medicine, Faculty of Medicine, University of Ljubljana, Slovenia.
| | | | | | - Tomaž Zupanc
- Institute of Forensic Medicine, Faculty of Medicine, University of Ljubljana, Slovenia.
| | - Carlo Previderè
- Department of Public Health, Experimental and Forensic Medicine, Section of Legal Medicine and Forensic Sciences, University of Pavia, Italy.
| | - Paolo Fattorini
- Department of Medicine, Surgery and Health, University of Trieste, Italy.
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14
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Malik S, Bahal R. Investigation of PLGA nanoparticles in conjunction with nuclear localization sequence for enhanced delivery of antimiR phosphorothioates in cancer cells in vitro. J Nanobiotechnology 2019; 17:57. [PMID: 31010426 PMCID: PMC6475967 DOI: 10.1186/s12951-019-0490-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 04/13/2019] [Indexed: 01/14/2023] Open
Abstract
Numerous first generation phosphorothioates (PS) and their derivatives have shown promise targeting mRNA for therapeutic applications and also gained market approval for their use as a drug. However, PS have not been explored for targeting microRNAs (miRNAs or miRs). In particular, efficient delivery remains a critical cog in PS-based antimiR applications. In this study, we tested and characterized a series of poly-lactic-co-glycolic-acid (PLGA) polymers of different molecular weights that can encapsulate the optimum amount of antimiR-155 PS with uniform morphology and surface charge density. We found that nuclear localization sequence substantially increases loading of antimiR-155 PS in PLGA nanoparticles. Further, in a battery of cell culture studies, we confirmed that PLGA nanoparticles encapsulated nuclear localization sequence/antimiR-155 PS combination undergoes significant intracellular delivery and results in reduced expression of miR-155. In conclusion, we successfully demonstrate the feasibility and promise of optimized PLGA nanoparticles based PS delivery in combination with nuclear localization sequence for antimiRs based therapeutics.
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Affiliation(s)
- Shipra Malik
- Department of Pharmaceutical Sciences, University of Connecticut, 69 North Eagleville Road, Unit 3092, Storrs, CT, 06269-3092, USA
| | - Raman Bahal
- Department of Pharmaceutical Sciences, University of Connecticut, 69 North Eagleville Road, Unit 3092, Storrs, CT, 06269-3092, USA.
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15
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Islam MA, Firdous J, Badruddoza AZM, Reesor E, Azad M, Hasan A, Lim M, Cao W, Guillemette S, Cho CS. M cell targeting engineered biomaterials for effective vaccination. Biomaterials 2018; 192:75-94. [PMID: 30439573 DOI: 10.1016/j.biomaterials.2018.10.041] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 10/09/2018] [Accepted: 10/28/2018] [Indexed: 02/08/2023]
Abstract
Vaccines are one of the greatest medical interventions of all time and have been successful in controlling and eliminating a myriad of diseases over the past two centuries. Among several vaccination strategies, mucosal vaccines have wide clinical applications and attract considerable interest in research, showing potential as innovative and novel therapeutics. In mucosal vaccination, targeting (microfold) M cells is a frontline prerequisite for inducing effective antigen-specific immunostimulatory effects. In this review, we primarily focus on materials engineered for use as vaccine delivery platforms to target M cells. We also describe potential M cell targeting areas, methods to overcome current challenges and limitations of the field. Furthermore, we present the potential of biomaterials engineering as well as various natural and synthetic delivery technologies to overcome the challenges of M cell targeting, all of which are absent in current literature. Finally, we briefly discuss manufacturing and regulatory processes to bring a robust perspective on the feasibility and potential of this next-generation vaccine technology.
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Affiliation(s)
- Mohammad Ariful Islam
- Center for Nanomedicine and Department of Anesthesiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
| | - Jannatul Firdous
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Abu Zayed Md Badruddoza
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Emma Reesor
- Department of Nanotechnology Engineering, University of Waterloo, Waterloo, Canada
| | - Mohammad Azad
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Anwarul Hasan
- Department of Mechanical and Industrial Engineering, Qatar University, Doha 2713, Qatar; Biomedical Research Center, Qatar University, Doha 2713, Qatar
| | - Michael Lim
- Department of Nanotechnology Engineering, University of Waterloo, Waterloo, Canada
| | - Wuji Cao
- Department of Nanotechnology Engineering, University of Waterloo, Waterloo, Canada
| | - Simon Guillemette
- Department of Nanotechnology Engineering, University of Waterloo, Waterloo, Canada
| | - Chong Su Cho
- Department of Agricultural Biotechnology and Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 08826, South Korea.
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16
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Patil TS, Deshpande AS. Nanostructured lipid carriers-based drug delivery for treating various lung diseases: A State‐of‐the‐Art Review. Int J Pharm 2018; 547:209-225. [DOI: 10.1016/j.ijpharm.2018.05.070] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 05/28/2018] [Accepted: 05/31/2018] [Indexed: 02/07/2023]
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17
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Keles E, Song Y, Du D, Dong WJ, Lin Y. Recent progress in nanomaterials for gene delivery applications. Biomater Sci 2018; 4:1291-309. [PMID: 27480033 DOI: 10.1039/c6bm00441e] [Citation(s) in RCA: 133] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Nanotechnology-based gene delivery is the division of nanomedicine concerned with the synthesis, characterization, and functionalization of nanomaterials to be used in targeted-gene delivery applications. Nanomaterial-based gene delivery systems hold great promise for curing fatal inherited and acquired diseases, including neurological disorders, cancer, cardiovascular diseases, and acquired immunodeficiency syndrome (AIDS). However, their use in clinical applications is still controversial. To date, the Food and Drug Administration (FDA) has not approved any gene delivery system because of the unknown long-term toxicity and the low gene transfection efficiency of nanomaterials in vivo. Compared to viral vectors, nonviral gene delivery vectors are characterized by a low preexisting immunogenicity, which is important for preventing a severe immune response. In addition, nonviral vectors provide higher loading capacity and ease of fabrication. For these reasons, this review article focuses on applications of nonviral gene delivery systems, including those based on lipids, polymers, graphene, and other inorganic nanoparticles, and discusses recent advances in nanomaterials for gene therapy. Methods of synthesizing these nanomaterials are briefly described from a materials science perspective. Also, challenges, critical issues, and concerns about the in vivo applications of nanomaterial-based gene delivery systems are discussed. It should be noted that this article is not a comprehensive review of the literature.
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Affiliation(s)
- Erhan Keles
- Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA 99164, USA
| | - Yang Song
- Department of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA.
| | - Dan Du
- Department of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA.
| | - Wen-Ji Dong
- Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA 99164, USA and Department of Integrated Physiology and Neuroscience, Washington State University, Pullman, WA 99164, USA
| | - Yuehe Lin
- Department of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA.
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18
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Gupta V, Khan Y, Berkland CJ, Laurencin CT, Detamore MS. Microsphere-Based Scaffolds in Regenerative Engineering. Annu Rev Biomed Eng 2018. [PMID: 28633566 DOI: 10.1146/annurev-bioeng-071516-044712] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Microspheres have long been used in drug delivery applications because of their controlled release capabilities. They have increasingly served as the fundamental building block for fabricating scaffolds for regenerative engineering because of their ability to provide a porous network, offer high-resolution control over spatial organization, and deliver growth factors/drugs and/or nanophase materials. Because they provide physicochemical gradients via spatiotemporal release of bioactive factors and nanophase ceramics, microspheres are a desirable tool for engineering complex tissues and biological interfaces. In this review we describe various methods for microsphere fabrication and sintering, and elucidate how these methods influence both micro- and macroscopic scaffold properties, with a special focus on the nature of sintering. Furthermore, we review key applications of microsphere-based scaffolds in regenerating various tissues. We hope to inspire researchers to join a growing community of investigators using microspheres as tissue engineering scaffolds so that their full potential in regenerative engineering may be realized.
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Affiliation(s)
- Vineet Gupta
- Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, Kansas 66045;
| | - Yusuf Khan
- Department of Orthopaedic Surgery, University of Connecticut Health Campus, Farmington, Connecticut 06030; , .,Department of Materials Science and Engineering, University of Connecticut, Storrs, Connecticut 06269.,Institute for Regenerative Engineering, University of Connecticut Health Campus, Farmington, Connecticut 06030
| | - Cory J Berkland
- Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, Kansas 66045; .,Department of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045;
| | - Cato T Laurencin
- Department of Orthopaedic Surgery, University of Connecticut Health Campus, Farmington, Connecticut 06030; , .,Department of Materials Science and Engineering, University of Connecticut, Storrs, Connecticut 06269.,Institute for Regenerative Engineering, University of Connecticut Health Campus, Farmington, Connecticut 06030
| | - Michael S Detamore
- Stephenson School of Biomedical Engineering, University of Oklahoma, Norman, Oklahoma 73019;
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19
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Anchordoquy TJ, Simberg D. Watching the gorilla and questioning delivery dogma. J Control Release 2017; 262:87-90. [PMID: 28713040 PMCID: PMC5662108 DOI: 10.1016/j.jconrel.2017.07.021] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 06/30/2017] [Accepted: 07/12/2017] [Indexed: 11/27/2022]
Affiliation(s)
- Thomas J Anchordoquy
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA.
| | - Dmitri Simberg
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
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20
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Giampetruzzi L, Blasi L, Quarta A, Argentiere S, Cella C, Salvatore L, Madaghiele M, Gigli G, Sannino A. Poly(lactide-co-glycolide) nanoparticles embedded in a micropatterned collagen scaffold for neuronal tissue regeneration. INT J POLYM MATER PO 2017. [DOI: 10.1080/00914037.2016.1217533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Lucia Giampetruzzi
- Istituto Italiano di Tecnologia, Lecce, Italy
- Department of Mathematics and Physics “Ennio De Giorgi”, University of Salento, Lecce, Italy
| | - Laura Blasi
- CNR NANOTEC - Institute of Nanotechnology, University of Salento, Lecce, Italy
| | - Alessandra Quarta
- CNR NANOTEC - Institute of Nanotechnology, University of Salento, Lecce, Italy
| | | | | | - Luca Salvatore
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
| | - Marta Madaghiele
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
| | - Giuseppe Gigli
- Department of Mathematics and Physics “Ennio De Giorgi”, University of Salento, Lecce, Italy
- CNR NANOTEC - Institute of Nanotechnology, University of Salento, Lecce, Italy
| | - Alessandro Sannino
- Department of Engineering for Innovation, University of Salento, Lecce, Italy
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21
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Recent development of synthetic nonviral systems for sustained gene delivery. Drug Discov Today 2017; 22:1318-1335. [PMID: 28428056 DOI: 10.1016/j.drudis.2017.04.001] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 03/02/2017] [Accepted: 04/05/2017] [Indexed: 12/22/2022]
Abstract
Sustained gene delivery is of particular importance today because it circumvents the need for repeated therapeutic administration and provides spatial and temporal control of the release profile. Better understanding of the genetic basis of diseases and advances in gene therapy have propelled significant research on biocompatible gene carriers for therapeutic purposes. Varied biodegradable polymer-based architectures have been used to create new compositions with unique properties suitable for sustained gene delivery. This review presents the most recent advances in various polymeric systems: hydrogels, microspheres, nanospheres and scaffolds, having complex architectures to encapsulate and deliver functional genes. Through the recombination of different existing polymer systems, the multicomplex systems can be further endowed with new properties for better-targeted biomedical applications.
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22
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Iyer R, Hsia CCW, Nguyen KT. Nano-Therapeutics for the Lung: State-of-the-Art and Future Perspectives. Curr Pharm Des 2016; 21:5233-44. [PMID: 26412358 DOI: 10.2174/1381612821666150923095742] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2015] [Accepted: 09/22/2015] [Indexed: 11/22/2022]
Abstract
Inhalation of aerosolized compounds is a popular, non-invasive route for the targeted delivery of therapeutic molecules to the lung. Various types of nanoparticles have been used as carriers to facilitate drug uptake and intracellular action in order to treat lung diseases and/or to facilitate lung repair and growth. These include polymeric nanoparticles, liposomes, and dendrimers, among many others. In addition, nanoparticles are sometimes used in combination with small molecules, cytokines, growth factors, and/or pluripotent stem cells. Here we review the rationale and state-of-the-art nanotechnology for pulmonary drug delivery, with particular attention to new technological developments and approaches as well as the challenges associated with them, the emerging advances, and opportunities for future development in this field.
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Affiliation(s)
| | | | - Kytai T Nguyen
- Department of Bioengineering, University of Texas at Arlington, 500 UTA Blvd, ERB 241, Arlington, TX 76019.
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23
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Abstract
In this article, advances in designing polymeric nanoparticles for targeted cancer gene therapy are reviewed. Characterization and evaluation of biomaterials, targeting ligands, and transcriptional elements are each discussed. Advances in biomaterials have driven improvements to nanoparticle stability and tissue targeting, conjugation of ligands to the surface of polymeric nanoparticles enable binding to specific cancer cells, and the design of transcriptional elements has enabled selective DNA expression specific to the cancer cells. Together, these features have improved the performance of polymeric nanoparticles as targeted non-viral gene delivery vectors to treat cancer. As polymeric nanoparticles can be designed to be biodegradable, non-toxic, and to have reduced immunogenicity and tumorigenicity compared to viral platforms, they have significant potential for clinical use. Results of polymeric gene therapy in clinical trials and future directions for the engineering of nanoparticle systems for targeted cancer gene therapy are also presented.
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Affiliation(s)
- Jayoung Kim
- Department of Biomedical Engineering and the Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - David R. Wilson
- Department of Biomedical Engineering and the Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Camila G. Zamboni
- Department of Biomedical Engineering and the Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins Medical Institutions, Baltimore, MD, USA
- Instituto do Câncer do Estado de São Paulo, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Jordan J. Green
- Department of Biomedical Engineering and the Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, USA
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Department of Ophthalmology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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24
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25
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Olabisi RM. Cell microencapsulation with synthetic polymers. J Biomed Mater Res A 2015; 103:846-59. [PMID: 24771675 PMCID: PMC4309473 DOI: 10.1002/jbm.a.35205] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 04/11/2014] [Accepted: 04/21/2014] [Indexed: 12/18/2022]
Abstract
The encapsulation of cells into polymeric microspheres or microcapsules has permitted the transplantation of cells into human and animal subjects without the need for immunosuppressants. Cell-based therapies use donor cells to provide sustained release of a therapeutic product, such as insulin, and have shown promise in treating a variety of diseases. Immunoisolation of these cells via microencapsulation is a hotly investigated field, and the preferred material of choice has been alginate, a natural polymer derived from seaweed due to its gelling conditions. Although many natural polymers tend to gel in conditions favorable to mammalian cell encapsulation, there remain challenges such as batch to batch variability and residual components from the original source that can lead to an immune response when implanted into a recipient. Synthetic materials have the potential to avoid these issues; however, historically they have required harsh polymerization conditions that are not favorable to mammalian cells. As research into microencapsulation grows, more investigators are exploring methods to microencapsulate cells into synthetic polymers. This review describes a variety of synthetic polymers used to microencapsulate cells.
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Affiliation(s)
- Ronke M Olabisi
- Department of Biomedical Engineering, Rutgers University, 599 Taylor Road, Piscataway, New Jersey, 08854
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26
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Sherwani MA, Tufail S, Khan AA, Owais M. Dendrimer-PLGA based multifunctional immuno-nanocomposite mediated synchronous and tumor selective delivery of siRNA and cisplatin: potential in treatment of hepatocellular carcinoma. RSC Adv 2015. [DOI: 10.1039/c5ra03651h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The in-house synthesized PLK-1 siRNA and cisplatin loaded innovative dendrimer-PLGA immuno-nanocomposite bears the capacity of delivering both the cargos simultaneously to the same liver cancer cell in a targeted manner.
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Affiliation(s)
| | - Saba Tufail
- Interdisciplinary Biotechnology Unit
- Aligarh Muslim University
- Aligarh
- India
| | - Aijaz Ahmed Khan
- Department of Anatomy
- Jawaharlal Nehru Medical College
- Faculty of Medicine
- Aligarh Muslim University
- Aligarh
| | - Mohammad Owais
- Interdisciplinary Biotechnology Unit
- Aligarh Muslim University
- Aligarh
- India
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27
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Kapoor M, Burgess DJ. Targeted Delivery of Nucleic Acid Therapeutics via Nonviral Vectors. ADVANCES IN DELIVERY SCIENCE AND TECHNOLOGY 2015. [DOI: 10.1007/978-3-319-11355-5_8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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28
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Iliescu C, Mărculescu C, Venkataraman S, Languille B, Yu H, Tresset G. On-chip controlled surfactant-DNA coil-globule transition by rapid solvent exchange using hydrodynamic flow focusing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:13125-13136. [PMID: 25351469 DOI: 10.1021/la5035382] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This paper presents a microfluidic method for precise control of the size and polydispersity of surfactant-DNA nanoparticles. A mixture of surfactant and DNA dispersed in 35% ethanol is focused between two streams of pure water in a microfluidic channel. As a result, a rapid change of solvent quality takes place in the central stream, and the surfactant-bound DNA molecules undergo a fast coil-globule transition. By adjusting the concentrations of DNA and surfactant, fine-tuning of the nanoparticle size, down to a hydrodynamic diameter of 70 nm with a polydispersity index below 0.2, can be achieved with a good reproducibility.
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Affiliation(s)
- Ciprian Iliescu
- Institute of Bioengineering and Nanotechnology , 31 Biopolis Way, The Nanos #04-01, Singapore 138669, Singapore
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29
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Haladjova E, Toncheva-Moncheva N, Apostolova MD, Trzebicka B, Dworak A, Petrov P, Dimitrov I, Rangelov S, Tsvetanov CB. Polymeric Nanoparticle Engineering: From Temperature-Responsive Polymer Mesoglobules to Gene Delivery Systems. Biomacromolecules 2014; 15:4377-95. [DOI: 10.1021/bm501194g] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Emi Haladjova
- Institute
of Polymers, Bulgarian Academy of Sciences, “Akad. G. Bonchev”
St. 103A, 1113 Sofia, Bulgaria
| | - Natalia Toncheva-Moncheva
- Institute
of Polymers, Bulgarian Academy of Sciences, “Akad. G. Bonchev”
St. 103A, 1113 Sofia, Bulgaria
| | - Margarita D. Apostolova
- Institute
of Molecular Biology “Roumen Tsanev”, Bulgarian Academy of Sciences, “Akad. G. Bonchev” St. 21, 1113 Sofia, Bulgaria
| | - Barbara Trzebicka
- Centre
of Polymer and Carbon Materials, Polish Academy of Sciences, M. Curie-Sklodowskiej 34, 41-819 Zabrze, Poland
| | - Andrzej Dworak
- Centre
of Polymer and Carbon Materials, Polish Academy of Sciences, M. Curie-Sklodowskiej 34, 41-819 Zabrze, Poland
| | - Petar Petrov
- Institute
of Polymers, Bulgarian Academy of Sciences, “Akad. G. Bonchev”
St. 103A, 1113 Sofia, Bulgaria
| | - Ivaylo Dimitrov
- Institute
of Polymers, Bulgarian Academy of Sciences, “Akad. G. Bonchev”
St. 103A, 1113 Sofia, Bulgaria
| | - Stanislav Rangelov
- Institute
of Polymers, Bulgarian Academy of Sciences, “Akad. G. Bonchev”
St. 103A, 1113 Sofia, Bulgaria
| | - Christo B. Tsvetanov
- Institute
of Polymers, Bulgarian Academy of Sciences, “Akad. G. Bonchev”
St. 103A, 1113 Sofia, Bulgaria
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30
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Huang W, Li X, Shi X, Lai C. Microsphere based scaffolds for bone regenerative applications. Biomater Sci 2014; 2:1145-1153. [DOI: 10.1039/c4bm00161c] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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31
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Purwada A, Roy K, Singh A. Engineering vaccines and niches for immune modulation. Acta Biomater 2014; 10:1728-40. [PMID: 24373907 DOI: 10.1016/j.actbio.2013.12.036] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 12/16/2013] [Accepted: 12/18/2013] [Indexed: 12/14/2022]
Abstract
Controlled modulation of immune response, especially the balance between immunostimulatory and immunosuppressive responses, is critical for a variety of clinical applications, including immunotherapies against cancer and infectious diseases, treatment of autoimmune disorders, transplant surgeries, regenerative medicine, prosthetic implants, etc. Our ability to precisely modify both innate and adaptive immune responses could provide new therapeutic directions in a variety of diseases. In the context of vaccines and immunotherapies, the interplay between antigen-presenting cells (e.g. dendritic cells and macrophages), B cells, T helper and killer subtypes, and regulatory T- and B-cell responses is critical for generating effective immunity against cancer, infectious diseases and autoimmune diseases. In recent years, immunoengineering has emerged as a new field that uses quantitative engineering tools to understand molecular-, cellular- and system-level interactions of the immune system and to develop design-driven approaches to control and modulate immune responses. Biomaterials are an integral part of this engineering toolbox and can exploit the intrinsic biological and mechanical cues of the immune system to directly modulate and train immune cells and direct their response to a particular phenotype. A large body of literature exists on strategies to evade or suppress the immune response in implants, transplantation and regenerative medicine. This review specifically focuses on the use of biomaterials for immunostimulation and controlled modulation, especially in the context of vaccines and immunotherapies against cancer, infectious diseases and autoimmune disorders. Bioengineering smart systems that can simultaneously deliver multiple bioactive agents in a controlled manner or can work as a niche for in situ priming and modulation of the immune system could significantly enhance the efficacy of next-generation immunotherapeutics. In this review, we describe our perspective on the important design aspects for the development of biomaterials that can actively modulate immune responses by stimulating receptor complexes and cells, and delivering multiple immunomodulatory biomolecules.
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32
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Tian Y, Wang H, Liu Y, Mao L, Chen W, Zhu Z, Liu W, Zheng W, Zhao Y, Kong D, Yang Z, Zhang W, Shao Y, Jiang X. A peptide-based nanofibrous hydrogel as a promising DNA nanovector for optimizing the efficacy of HIV vaccine. NANO LETTERS 2014; 14:1439-45. [PMID: 24564254 DOI: 10.1021/nl404560v] [Citation(s) in RCA: 137] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
This report shows that a nanovector composed of peptide-based nanofibrous hydrogel can condense DNA to result in strong immune responses against HIV. This nanovector can strongly activate both humoral and cellular immune responses to a balanced level rarely reported in previous studies, which is crucial for HIV prevention and therapy. In addition, this nanovector shows good biosafety in vitro and in vivo. Detailed characterizations show that the nanofibrous structure of the hydrogel is critical for the dramatically improved immune responses compared to existing materials. This peptide-based nanofibrous hydrogel shows great potential for efficacious HIV DNA vaccines and can be potentially used for delivering other vaccines and drugs.
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Affiliation(s)
- Yue Tian
- Beijing Engineering Research Center for BioNanotechnology and CAS Key Lab for Biological Effects of Nanomaterials and Nanosafety, National Center for NanoScience and Technology , No., 11 Zhongguancun Beiyitiao, Beijing 100190, China
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33
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Dey AK, Srivastava IK. Novel adjuvants and delivery systems for enhancing immune responses induced by immunogens. Expert Rev Vaccines 2014; 10:227-51. [DOI: 10.1586/erv.10.142] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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34
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Gene therapy and DNA delivery systems. Int J Pharm 2013; 459:70-83. [PMID: 24286924 DOI: 10.1016/j.ijpharm.2013.11.041] [Citation(s) in RCA: 294] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Revised: 10/31/2013] [Accepted: 11/19/2013] [Indexed: 12/29/2022]
Abstract
Gene therapy is a promising new technique for treating many serious incurable diseases, such as cancer and genetic disorders. The main problem limiting the application of this strategy in vivo is the difficulty of transporting large, fragile and negatively charged molecules like DNA into the nucleus of the cell without degradation. The key to success of gene therapy is to create safe and efficient gene delivery vehicles. Ideally, the vehicle must be able to remain in the bloodstream for a long time and avoid uptake by the mononuclear phagocyte system, in order to ensure its arrival at the desired targets. Moreover, this carrier must also be able to transport the DNA efficiently into the cell cytoplasm, avoiding lysosomal degradation. Viral vehicles are the most commonly used carriers for delivering DNA and have long been used for their high efficiency. However, these vehicles can trigger dangerous immunological responses. Scientists need to find safer and cheaper alternatives. Consequently, the non-viral carriers are being prepared and developed until techniques for encapsulating DNA can be found. This review highlights gene therapy as a new promising technique used to treat many incurable diseases and the different strategies used to transfer DNA, taking into account that introducing DNA into the cell nucleus without degradation is essential for the success of this therapeutic technique.
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Mitra RN, Han Z, Merwin M, Al Taai M, Conley SM, Naash MI. Synthesis and characterization of glycol chitosan DNA nanoparticles for retinal gene delivery. ChemMedChem 2013; 9:189-96. [PMID: 24203490 DOI: 10.1002/cmdc.201300371] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Indexed: 12/13/2022]
Abstract
Given the number of monogenic ocular diseases and the number of non-monogenic degenerative ocular diseases for which gene therapy is considered as a treatment, the development of effective therapeutic delivery strategies for DNA is a critical research goal. In this work, nonviral nanoparticles (NPs) composed of glycol chitosan (GCS) and plasmid DNA (pDNA) were generated, characterized, and evaluated. These particles are stable, do not aggregate in saline, are resistant to DNases, and have a hydrodynamic diameter of approximately 250 nm. Furthermore, the plasmid in these NPs was shown to maintain its proper conformation and can be released and expressed inside the cell. To determine whether these NPs would be suitable for intraocular use, pDNA carrying the ubiquitously expressed CBA-eGFP expression cassette was compacted and subretinally injected into adult wild-type albino mice. At day 14 post-injection (PI), substantial green fluorescent protein (GFP) expression was observed exclusively in the retinal pigment epithelium (RPE) in eyes treated with GCS NPs but not in those treated with uncompacted pDNA or vehicle (saline). No signs of gross retinal toxicity were observed, and at 30 days PI, there was no difference in electroretinogram function between GCS NP-, pDNA-, or vehicle-treated eyes. These results suggest that with further development, GCS NPs could be a useful addition to the available repertoire of genetic therapies for the treatment of RPE-associated diseases.
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Affiliation(s)
- Rajendra N Mitra
- Department of Cell Biology, University of Oklahoma Health Sciences Center, 940 Stanton L Young Blvd. BMSB781, Oklahoma City, OK 73104 (USA)
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Perry SL, Neumann SG, Neumann T, Cheng K, Ni J, Weinstein JR, Schaffer DV, Tirrell M. Challenges in nucleic acid-lipid films for transfection. AIChE J 2013. [DOI: 10.1002/aic.14198] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
| | - Surekha G. Neumann
- Dept. of Chemistry and Biochemistry; University of California at Santa Barbara; Santa Barbara; CA; 93106
| | | | - Karen Cheng
- Dept. of Bioengineering; University of California at Berkeley; Berkeley; CA; 94720
| | - Jennifer Ni
- Dept. of Bioengineering; University of California at Berkeley; Berkeley; CA; 94720
| | - John R. Weinstein
- Dept. of Bioengineering; University of California at Berkeley; Berkeley; CA; 94720
| | - David V. Schaffer
- Dept. of Bioengineering and Dept of Chemical and Biomolecular Engineering; University of California at Berkeley; Berkeley; CA; 94720
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Choi SJ, Oh SH, Kim IG, Chun SY, Lee JY, Lee JH. Functional recovery of urethra by plasmid DNA-loaded injectable agent for the treatment of urinary incontinence. Biomaterials 2013; 34:4766-76. [PMID: 23545290 DOI: 10.1016/j.biomaterials.2013.03.045] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Accepted: 03/15/2013] [Indexed: 02/08/2023]
Abstract
Stress urinary incontinence (SUI) is an embarrassing problem affecting a large number of women and interfering with their quality of life. The injury or weakness of urethral supporting tissues by childbirth and aging has been considered as key factors in the development of the SUI. In this study, plasmid DNA (pDNA; encoding for bFGF) complex-loaded poly(DL-lactic-co-glycolic acid) (PLGA)/Pluronic F127 mixture dispersed with polycaprolactone (PCL) microspheres was prepared as an injectable bioactive bulking agent that may provide bulking effect (by PCL microspheres) and allow stimulation of the defect tissues around urethra (by synthesis of bFGF from cells or tissues transfected by the pDNA complex) for the effective treatment of SUI. From in vitro experiments, the pDNA complex incorporated in the bulking agent was released in a sustained manner over 84 days (≥80% of the initial loading amount). The pDNA complex was effectively transfected into fibroblasts and the cells were continuously producing the target protein, bFGF. From the in vivo study using hairless mice and Sprague-Dawley rats, it was confirmed that the pDNA complex released from the bulking agent is transfected into surrounding cells/tissue, and the cells/tissues synthesize sufficient bFGF to regenerate smooth muscle with biological function around the urethra. Basis on these results, the pDNA (encoding for bFGF) complex-loaded PLGA/Pluronic F127 mixture dispersed with PCL microspheres can be a promising bioactive bulking agent system for the fundamental cure of SUI.
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Affiliation(s)
- Soo Jung Choi
- Department of Advanced Materials, Hannam University, Yuseong Gu, Daejeon, Republic of Korea
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Reinhold SE, Desai KGH, Zhang L, Olsen KF, Schwendeman SP. Self-healing microencapsulation of biomacromolecules without organic solvents. Angew Chem Int Ed Engl 2012; 51:10800-3. [PMID: 23011773 PMCID: PMC3817563 DOI: 10.1002/anie.201206387] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Indexed: 11/10/2022]
Abstract
Microencapsulation of biomacromolecules in PLGA is routinely performed with organic solvent through multiple complex steps deleterious to the biomacromolecule. The new self-healing based PLGA microencapsulation obviates micronization- and organic solvent-induced protein damage, provides very high encapsulation efficiency, exhibit stabilization and slow release of labile tetanus protein antigen, and provides long-term testosterone suppression in rats following a single injection of encapsulated leuprolide.
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Affiliation(s)
| | | | | | - Karl F. Olsen
- Department of Pharmaceutical Sciences, University of Michigan, 428 Church St., Ann Arbor, MI 48109, USA. Fax: (+) 734-615-6162
| | - Steven P. Schwendeman
- Department of Pharmaceutical Sciences, University of Michigan, 428 Church St., Ann Arbor, MI 48109, USA. Fax: (+) 734-615-6162
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Reinhold SE, Desai KGH, Zhang L, Olsen KF, Schwendeman SP. Self-Healing Microencapsulation of Biomacromolecules without Organic Solvents. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201206387] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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40
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Advances in polymeric and inorganic vectors for nonviral nucleic acid delivery. Ther Deliv 2012; 2:493-521. [PMID: 22826857 DOI: 10.4155/tde.11.14] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Nonviral systems for nucleic acid delivery offer a host of potential advantages compared with viruses, including reduced toxicity and immunogenicity, increased ease of production and less stringent vector size limitations, but remain far less efficient than their viral counterparts. In this article we review recent advances in the delivery of nucleic acids using polymeric and inorganic vectors. We discuss the wide range of materials being designed and evaluated for these purposes while considering the physical requirements and barriers to entry that these agents face and reviewing recent novel approaches towards improving delivery with respect to each of these barriers. Furthermore, we provide a brief overview of past and ongoing nonviral gene therapy clinical trials. We conclude with a discussion of multifunctional nucleic acid carriers and future directions.
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Tu F, Lee D. Controlling the stability and size of double-emulsion-templated poly(lactic-co-glycolic) acid microcapsules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:9944-52. [PMID: 22667691 DOI: 10.1021/la301498f] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The stability and size of poly(lactic-co-glycolic)acid (PLGA)-containing double emulsions and the resulting PLGA microcapsules are controlled by varying the composition of highly monodisperse water-in-oil-in-water (W/O/W) double emulsions. We propose that the basic inner phase of W/O/W double emulsions catalyzes the hydrolysis of PLGA and the ionization of carboxylic acid end groups, which enhances the surface activity of PLGA and facilitates the stabilization of the double emulsions. The size of PLGA-containing double emulsions and that of resulting microcapsules can be readily tuned by osmotic annealing, which depends on the concentration ratio of a solute in the inner and outer phases of double emulsions. The internal volume of PLGA microcapsules can be changed by more than 3 orders of magnitude using this method. This approach also overcomes the difficulty in generating monodisperse double emulsions and microcapsules over a wide range of dimensions using a single microfluidic device. The osmotic annealing method can also be used to concentrate encapsulated species such as colloidal suspensions and biomacromolecules.
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Affiliation(s)
- Fuquan Tu
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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Shau MD, Shih MF, Lin CC, Chuang IC, Hung WC, Hennink WE, Cherng JY. A one-step process in preparation of cationic nanoparticles with poly(lactide-co-glycolide)-containing polyethylenimine gives efficient gene delivery. Eur J Pharm Sci 2012; 46:522-9. [PMID: 22522118 DOI: 10.1016/j.ejps.2012.04.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Revised: 03/15/2012] [Accepted: 04/04/2012] [Indexed: 10/28/2022]
Abstract
A one-step preparation of nanoparticles with poly(lactide-co-glycolide) (PLGA) pre-modified with polyethylenimine (PEI) is better in requirements for DNA delivery compared to those prepared in a two-step process (preformed PLGA nanoparticles and subsequently coated with PEI). The particles were prepared by emulsification of PLGA/ethyl acetate in an aqueous solution of PVA and PEI. DLS, AFM and SEM were used for the size characteristics. The cytotoxicity of PLGA/PEI nanoparticles was detected by MTT assay. The transfection activity of the particles was measured using pEGFP and pβ-gal plasmid DNA. Results showed that the PLGA/PEI nanoparticles were spherical and non-porous with a size of about 0.2 μm and a small size distribution. These particles had a positive zeta potential demonstrating that PEI was attached. Interestingly, the zeta potential of the particles (from one-step procedure) was substantially higher than that of two-step process and is ascribed to the conjugation of PEI to PLGA via aminolysis. The PLGA/PEI nanoparticles were able to bind DNA and the formed complexes had a substantially lower cytotoxicity and a higher transfection activity than PEI polyplexes. In conclusion, given their small size, stability, low cytotoxicity and good transfection activity, PLGA/PEI-DNA complexes are attractive gene delivery systems.
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Affiliation(s)
- Min Da Shau
- Department of Biotechnology, Chia-Nan University of Pharmacy and Science, 60 Erh-Jen Rd., Sec. 1, Jen-Te, Taiwan
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Jain S, O'Hagan DT, Singh M. The long-term potential of biodegradable poly(lactide-co-glycolide) microparticles as the next-generation vaccine adjuvant. Expert Rev Vaccines 2012; 10:1731-42. [PMID: 22085176 DOI: 10.1586/erv.11.126] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Biodegradable polymeric microparticles of poly(lactide-co-glycolide) (PLG) have been extensively evaluated for drug delivery and vaccine applications over the last three decades. Despite a wealth of studies on the use of PLG microparticles in vaccines through controlled release of antigens, there is no commercial PLG-based vaccine as yet. The key challenge that prevented the development of PLG microparticles as commercial vaccines was the instability of encapsulated antigen. Over the years, advancements were made towards maintaining antigen integrity during PLG microparticle preparation and sterilization. In parallel and independently, development of PLG microparticles as therapeutic commercial products established PLG with an excellent safety record in humans, and as a suitable candidate for next-generation vaccines. Through the combination of Toll-like receptor agonist encapsulation and surface adsorption of antigen, PLG microparticles can be used as a vaccine adjuvant to address unmet medical needs, such as vaccines against HIV, malaria and TB. With strategic development of PLG-based vaccines, PLG microparticles can offer advantages over the conventional vaccine adjuvants allowing commercial development of this adjuvant.
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Affiliation(s)
- Siddhartha Jain
- Novartis Vaccines and Diagnostics, Cambridge, MA 02139, USA.
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Betker J, Smyth T, Wang W, Anchordoquy TJ. Application of a ultra performance liquid chromatography method in the determination of DNA quality and stability. J Pharm Sci 2011; 101:987-97. [PMID: 22113832 DOI: 10.1002/jps.22830] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Revised: 10/31/2011] [Accepted: 11/03/2011] [Indexed: 11/05/2022]
Abstract
The development of plasmid DNA as a pharmaceutical requires that integrity (i.e., supercoil content) be monitored as part of quality control. The standard method of determining supercoil content is gel electrophoresis followed by staining and imaging, which is complicated by a variety of factors. Previously described chromatographic methods used to quantify supercoil content have had difficulty obtaining reliable separation of the different isoforms. Using ultra performance liquid chromatography, we have optimized buffer conditions, and utilized increased column temperatures in developing a method that allows accurate quantification of each isoform by ultraviolet detection. We found that increasing the column temperature to 55°C improved separation of the isoform peaks as well as increased the resolution of each peak. We demonstrate the utility of this method by quantifying supercoil content of samples subjected to sonication, acidification or lyophilization, and storage. Our results demonstrate that this method allows for a precise quantification of individual DNA isoforms within a heterogeneous sample.
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Affiliation(s)
- Jamie Betker
- University of Colorado School of Pharmacy, Aurora, Colorado 80045, USA
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Kolk A, Haczek C, Koch C, Vogt S, Kullmer M, Pautke C, Deppe H, Plank C. A strategy to establish a gene-activated matrix on titanium using gene vectors protected in a polylactide coating. Biomaterials 2011; 32:6850-9. [PMID: 21741701 DOI: 10.1016/j.biomaterials.2011.05.071] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Accepted: 05/25/2011] [Indexed: 01/01/2023]
Abstract
Bioactive implants are promising tools in regenerative medicine. Here we describe a versatile procedure for preparing a gene-activated matrix on titanium. Lyophilized copolymer-protected gene vectors (COPROGs) suspended in poly(d,l-lactide) (PDLLA) solutions in ethyl acetate were used to varnish solid surfaces. The gene-activated PDLLA surfaces were first established on polypropylene 96-well plates. Vector release from these surfaces in aqueous buffer, cell viability and gene transfer efficiency to NIH 3T3 fibroblasts was strongly dependent on the vector dose and its ratio to PDLLA film thickness. A detailed analysis of these relationships allowed establishing correlations which can be used to calculate suitable combinations of COPROGs and PDLLA yielding optimal gene transfer efficiency. This was verified with COPROG-activated PDLLA coatings on titanium foils. HEK 293 and mesenchymal stem cells expressed the BMP-2 gene comprised in the gene-activated surface in a manner that was consistent with the predicted dose-response and toxicity profiles found in NIH 3T3 cells. The systematic procedure presented here for identifying optimal coating compositions can be applied to any combination of vector type and coating material.
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Affiliation(s)
- Andreas Kolk
- Department of Oral and Maxillofacial Surgery, Technische Universität München, Ismaninger Str. 22, 81675 Munich, Bavaria, Germany.
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Stromal-derived factor-1 alpha-loaded PLGA microspheres for stem cell recruitment. Pharm Res 2011; 28:2477-89. [PMID: 21614634 DOI: 10.1007/s11095-011-0474-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Accepted: 05/03/2011] [Indexed: 01/27/2023]
Abstract
PURPOSE Stromal-derived factor-1 alpha (SDF-1α) is a chemoattractant that has been investigated for treating various diseases, with the goal of recruiting endogenous stem cells to the site of injury. Biodegradable PLGA microspheres were investigated as a means to deliver SDF-1α in a sustained-release manner. METHODS We encapsulated SDF-1α into biodegradable poly(lactide-co-glycolide) (PLGA) microspheres using a double-emulsion solvent extraction/evaporation technique. We varied several formulation parameters, characterized the in vitro release profile of SDF-1α and the size and morphology of microspheres, and determined the bioactivity of the released SDF-1α of stimulating migration of mesenchymal stem cells (MSCs). RESULTS We found that microspheres fabricated using end-capped PLGA, BSA as an excipient, and low solvent volumes yielded a high encapsulation efficiency (>64%) and released SDF-1α over a >50-day timeframe. The released SDF-1α was bioactive and caused significant migration of MSCs throughout the duration of release from the microspheres. CONCLUSIONS We have identified several variables that led to successful encapsulation of SDF-1α into PLGA microspheres. We envision that SDF-lα-loaded microspheres may serve as injectable sources of sustained-release chemokine for promoting the recruitment of endogenous stem cells to the site of injury.
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Oh SH, Kim TH, Jang SH, Im GI, Lee JH. Hydrophilized 3D porous scaffold for effective plasmid DNA delivery. J Biomed Mater Res A 2011; 97:441-50. [PMID: 21484988 DOI: 10.1002/jbm.a.33079] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Revised: 12/10/2010] [Accepted: 02/10/2011] [Indexed: 11/06/2022]
Abstract
In this study, hydrophilic PLGA/Pluronic F127 scaffolds loaded with a pDNA/PEI-PEG complex were prepared to estimate their potential use as a polymeric matrix for pDNA delivery. The scaffold was fabricated by a novel precipitation/particulate leaching method. The prepared pDNA/PEI-PEG complex-loaded PLGA/Pluronic F127 scaffold exhibited a highly porous (porosity, 93-95%) and open pore structure, as well as hydrophilicity, which can provide the good environment for cell adhesion and growth. The pDNA/PEI-PEG complexes were efficiently loaded into the PLGA/Pluronic F127 scaffold and continuously released from the scaffolds up to ~90% of the initial loading amount over a period of 8 wk, which may lead to continuous gene transfection into human bone marrow mesenchymal stem cells (hBMMSCs). From the in vitro cell culture in the scaffolds for transfection, it was observed that the pDNA/PEI-PEG complex-loaded hydrophilic PLGA/Pluronic F127 scaffold has a higher transfection efficiency of the pDNA/PEI-PEG complexes into hBMMSCs than the hydrophobic PLGA ones. The cell viability associated with the pDNA/PEI-PEG complexes released from the PLGA/Pluronic F127 scaffold was not significantly different from that of the PLGA/Pluronic F127 scaffold without pDNA, indicating its low cytotoxicity, probably due to the sustained release of the pDNA/PEI-PEG complex from the scaffolds. From these results, we could suggest that the pDNA/PEI-PEG complex-loaded hydrophilic PLGA/Pluronic F127 scaffold can be an effective gene delivery system for 3D tissue formation.
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Affiliation(s)
- Se Heang Oh
- Department of Advanced Materials, Hannam University, 461-6 Jeonmin Dong, Yuseong Gu, Daejeon 305-811, Korea
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Formulation and characterization of naked DNA and complexed DNA loaded polymer films. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2011. [DOI: 10.1016/j.msec.2010.08.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Liu J, Xu L, Li Y, Ma J. Temporally controlled multiple-gene delivery in scaffolds: A promising strategy to enhance bone regeneration. Med Hypotheses 2011; 76:173-5. [DOI: 10.1016/j.mehy.2010.09.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2010] [Revised: 09/06/2010] [Accepted: 09/08/2010] [Indexed: 10/19/2022]
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McNeela EA, Lavelle EC. Recent Advances in Microparticle and Nanoparticle Delivery Vehicles for Mucosal Vaccination. Curr Top Microbiol Immunol 2011; 354:75-99. [DOI: 10.1007/82_2011_140] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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