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Feng H, Yang X, Zhang L, Liu Q, Feng Y, Wu D, Liu Y, Yang J. Mannose-Modified Chitosan Poly(lactic- co-glycolic acid) Microspheres Act as a Mannose Receptor-Mediated Delivery System Enhancing the Immune Response. Polymers (Basel) 2021; 13:polym13132208. [PMID: 34279352 PMCID: PMC8271610 DOI: 10.3390/polym13132208] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 06/26/2021] [Accepted: 06/30/2021] [Indexed: 12/16/2022] Open
Abstract
The mannose receptor (MAN-R)-targeted delivery system is commonly used to deliver antigens to macrophages or immature dendritic cells (DCs) to promote the efficiency of antigen presentation. To maximize the enhancement effects of chitosan (CS) and induce an efficient humoral and cellular immune response against an antigen, we encapsulated ovalbumin (OVA) in poly(lactic-co-glycolic acid) (PLGA) microspheres (MPs) and conjugated it with MAN-modified CS to obtain MAN-R-targeting nano-MPs (MAN-CS-OVA-PLGA-MPs). The physicochemical properties, drug loading rate, and immunomodulation activity of MAN-CS-OVA-PLGA-MPs were evaluated. In vitro, MAN-CS-OVA-PLGA-MPs (80 μg mL−1) could enhance the proliferation of DCs and increase their phagocytic efficiency. In vivo, MAN-CS-OVA-PLGA-MPs significantly increased the ratio of CD3+CD4+/CD3+CD8+ T cells, increased CD80+, CD86+, and MHC II expression in DCs, and improved OVA-specific IgG, IgG1, IgG2a, and IgG2b antibodies. Moreover, MAN-CS-OVA-PLGA-MPs promoted cytokine (IFN-γ, IL-4, and IL-6) production in mice. Taken together, our results show that MAN-CS-OVA-PLGA-MPs may act by activating the T cells to initiate an immune response by promoting the maturation of dendritic cells and improving their antigen presentation efficiency. The current study provides a basis for the use of MAN-CS-OVA-PLGA-MPs as an antigen and adjuvant delivery system targeting the MAN-R on the surface of macrophages and dendritic cells.
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Affiliation(s)
- Haibo Feng
- College of Animal Husbandry and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China; (X.Y.); (L.Z.); (Q.L.); (Y.F.); (D.W.)
- Key Laboratory of Ministry of Education and Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Chengdu 610041, China
- Correspondence: ; Tel./Fax: +86-28-85522310
| | - Xiaonong Yang
- College of Animal Husbandry and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China; (X.Y.); (L.Z.); (Q.L.); (Y.F.); (D.W.)
- Key Laboratory of Ministry of Education and Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Chengdu 610041, China
| | - Linzi Zhang
- College of Animal Husbandry and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China; (X.Y.); (L.Z.); (Q.L.); (Y.F.); (D.W.)
- Key Laboratory of Ministry of Education and Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Chengdu 610041, China
| | - Qianqian Liu
- College of Animal Husbandry and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China; (X.Y.); (L.Z.); (Q.L.); (Y.F.); (D.W.)
- Key Laboratory of Ministry of Education and Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Chengdu 610041, China
| | - Yangyang Feng
- College of Animal Husbandry and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China; (X.Y.); (L.Z.); (Q.L.); (Y.F.); (D.W.)
- Key Laboratory of Ministry of Education and Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Chengdu 610041, China
| | - Daiyan Wu
- College of Animal Husbandry and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China; (X.Y.); (L.Z.); (Q.L.); (Y.F.); (D.W.)
- Key Laboratory of Ministry of Education and Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Chengdu 610041, China
| | - Yunjie Liu
- Department of Veterinary Medicine, Southwest University, Rongchang 402460, China; (Y.L.); (J.Y.)
| | - Jie Yang
- Department of Veterinary Medicine, Southwest University, Rongchang 402460, China; (Y.L.); (J.Y.)
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Jamaledin R, Sartorius R, Di Natale C, Vecchione R, De Berardinis P, Netti PA. Recombinant Filamentous Bacteriophages Encapsulated in Biodegradable Polymeric Microparticles for Stimulation of Innate and Adaptive Immune Responses. Microorganisms 2020; 8:microorganisms8050650. [PMID: 32365728 PMCID: PMC7285279 DOI: 10.3390/microorganisms8050650] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 04/24/2020] [Accepted: 04/27/2020] [Indexed: 11/24/2022] Open
Abstract
Escherichia coli filamentous bacteriophages (M13, f1, or fd) have attracted tremendous attention from vaccinologists as a promising immunogenic carrier and vaccine delivery vehicle with vast possible applications in the development of vaccines. The use of fd bacteriophage as an antigen delivery system is based on a modification of bacteriophage display technology. In particular, it is designed to express multiple copies of exogenous peptides (or polypeptides) covalently linked to viral capsid proteins. This study for the first time proposes the use of microparticles (MPs) made of poly (lactic-co-glycolic acid) (PLGA) to encapsulate fd bacteriophage. Bacteriophage–PLGA MPs were synthesized by a water in oil in water (w1/o/w2) emulsion technique, and their morphological properties were analyzed by confocal and scanning electron microscopy (SEM). Moreover, phage integrity, encapsulation efficiency, and release were investigated. Using recombinant bacteriophages expressing the ovalbumin (OVA) antigenic determinant, we demonstrated the immunogenicity of the encapsulated bacteriophage after being released by MPs. Our results reveal that encapsulated bacteriophages are stable and retain their immunogenic properties. Bacteriophage-encapsulated PLGA microparticles may thus represent an important tool for the development of different bacteriophage-based vaccine platforms.
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Affiliation(s)
- Rezvan Jamaledin
- Center for Advanced Biomaterials for Health Care (CABHC), Istituto Italiano di Tecnologia, 80125 Naples, Italy; (R.J.); (C.D.N.); (P.A.N.)
| | - Rossella Sartorius
- Institute of Biochemistry and Cell Biology (IBBC), CNR, 80131 Naples, Italy; (R.S.); (P.D.B.)
| | - Concetta Di Natale
- Center for Advanced Biomaterials for Health Care (CABHC), Istituto Italiano di Tecnologia, 80125 Naples, Italy; (R.J.); (C.D.N.); (P.A.N.)
- Department of Chemical Materials and Industrial Production (DICMAPI), University of Naples Federico II, 80125 Naples, Italy
| | - Raffaele Vecchione
- Center for Advanced Biomaterials for Health Care (CABHC), Istituto Italiano di Tecnologia, 80125 Naples, Italy; (R.J.); (C.D.N.); (P.A.N.)
- Correspondence:
| | | | - Paolo Antonio Netti
- Center for Advanced Biomaterials for Health Care (CABHC), Istituto Italiano di Tecnologia, 80125 Naples, Italy; (R.J.); (C.D.N.); (P.A.N.)
- Department of Chemical Materials and Industrial Production (DICMAPI), University of Naples Federico II, 80125 Naples, Italy
- Interdisciplinary Research Center of Biomaterials, CRIB, University Federico II, P.leTecchio 80, 80125 Naples, Italy
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Choi Y, Jeong JH, Kim J. Mechanically Enhanced Hierarchically Porous Scaffold Composed of Mesoporous Silica for Host Immune Cell Recruitment. Adv Healthc Mater 2017; 6. [PMID: 28169511 DOI: 10.1002/adhm.201601160] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Revised: 12/28/2016] [Indexed: 12/30/2022]
Abstract
Hierarchically porous materials have been of interest in many diverse fields, including catalysis, separations, and tissue engineering, because the hierarchical porosity of the materials contributes to improvements in mechanical properties, transport properties, and molecule selectivity. In this study, we, for the first time, introduce a new approach to fabricate hierarchical macroporous and mesoporous silica scaffolds based on a salt-leaching process using as-prepared mesoporous silica as a building block. The mechanical strength of the resulting inorganic 3D scaffold was significantly improved by controlling the interfaces of mesoporous silica particles, which allowed for high structural stability during in vivo implantation. Implantation of the scaffold loaded with pro-inflammatory cytokine in mesopores into mice successfully recruited a high number of host immune cells, including dendritic cells, into the macropores, which shows their potential use for immunomodulation.
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Affiliation(s)
- Youngjin Choi
- School of Chemical Engineering; Sungkyunkwan University (SKKU); Suwon 16419 Republic of Korea
| | - Ji Hoon Jeong
- School of Pharmacy; Sungkyunkwan University (SKKU); Suwon 16419 Republic of Korea
| | - Jaeyun Kim
- School of Chemical Engineering; Sungkyunkwan University (SKKU); Suwon 16419 Republic of Korea
- Samsung Advanced Institue for Health Science & Technology (SAIHST); Sungkyunkwan University (SKKU); Suwon 16419 Republic of Korea
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Abstract
Whilst oral vaccination is a potentially preferred route in terms of patient adherence and mass vaccination, the ability to formulate effective oral vaccines remains a challenge. The primary barrier to oral vaccination is effective delivery of the vaccine through the GI tract owing to the many obstacles it presents, including low pH, enzyme degradation and bile-salt solubilization, which can result in breakdown/deactivation of a vaccine. For effective immune responses after oral administration, particulates need to be taken up by the M cells however, these are few in number. To enhance M-cell uptake, particle characteristics can be optimized with particle size, surface charge, targeting groups and bioadhesive properties all being considerations. Yet improved uptake may not translate into enhanced immune responses and formulating particulates with inherent adjuvant properties can offer advantages. Within this article, we establish the options available for consideration when building effective oral particulate vaccines.
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Sezer AD, Akbuğa J. Comparison on in vitro characterization of fucospheres and chitosan microspheres encapsulated plasmid DNA (pGM-CSF): formulation design and release characteristics. AAPS PharmSciTech 2009; 10:1193-9. [PMID: 19859814 DOI: 10.1208/s12249-009-9324-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2009] [Accepted: 09/30/2009] [Indexed: 01/23/2023] Open
Abstract
Granulocyte-macrophage colony-stimulating factor (GM-CSF) is a cytokine used in the treatment of serious conditions resulting from chemotherapy and bone marrow transplantation such as neutropenia and aplastic anemia. Despite these effects, GM-CSF has a very short biological half-life, and it requires frequent injection during the treatment. Therefore, the cytokine production is possible in the body with plasmid-encoded GM-CSF (pGM-CSF) coding for cytokine administered to the body. However, the selection of the proper delivery system for the plasmid is important. In this study, two different delivery systems, encapsulated plasmid such as fucoidan-chitosan (fucosphere) and chitosan microspheres, were prepared and the particle physicochemical properties evaluated. Fucospheres and chitosan microspheres size ranges are 151-401 and 376-681 nm. The zeta potential values of the microspheres were changed between 8.3-17.1 mV (fucosphere) and +21.9-28.9 mV (chitosan microspheres). The encapsulation capacity of fucospheres changed between 84.2% and 94.7% depending on the chitosan molecular weight used in the formulation. In vitro plasmid DNA release from both delivery systems exhibited slower profiles of approximately 90-140 days. Integrity of released samples was checked by agarose gel electrophoresis, and any additional band was not seen. All formulations were analyzed kinetically. The calculated regression coefficients showed a higher r2 value with zero-order kinetics. In conclusion, the characterizations of the microspheres can be modulated by changing the formulation variables, and it can be concluded that fucospheres might be a potential carrier system for the controlled delivery of GM-CSF encoding plasmid DNA.
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Guo C, Gemeinhart RA. Understanding the adsorption mechanism of chitosan onto poly(lactide-co-glycolide) particles. Eur J Pharm Biopharm 2008; 70:597-604. [PMID: 18602994 PMCID: PMC2612535 DOI: 10.1016/j.ejpb.2008.06.008] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2007] [Revised: 06/06/2008] [Accepted: 06/10/2008] [Indexed: 12/14/2022]
Abstract
Polyelectrolyte-coated nanoparticles or microparticles interact with bioactive molecules (peptides, proteins or nucleic acids) and have been proposed as delivery systems for these molecules. However, the mechanism of adsorption of polyelectrolyte onto particles remains unsolved. In this study, cationic poly(lactide-co-glycolide) (PLGA) nanoparticles were fabricated by adsorption of various concentrations of a biodegradable polysaccharide, chitosan (0-2.4g/L), using oil-in-water emulsion and solvent evaporation techniques. The particle diameter, zeta-potential, and chitosan adsorption of chitosan-coated PLGA nanoparticles confirmed the increase of polyelectrolyte adsorption. Five adsorption isotherm models (Langmuir, Freundlich, Halsey, Henderson, and Smith) were applied to the experimental data in order to better understand the mechanism of adsorption. Both particle diameter and chitosan adsorption increased with chitosan concentration during adsorption. A good correlation was obtained between PLGA-chitosan nanoparticle size and adsorbed chitosan on the surface, suggesting that the increased particle size was primarily due to the increased chitosan adsorption. The zeta-potential of chitosan-coated PLGA nanoparticles was positive and increased with chitosan adsorbed until a maximum value (+55mV) was reached at approximately 0.4-0.6g/L; PLGA nanoparticles had a negative zeta-potential (-20mV) prior to chitosan adsorption. Chitosan adsorption on PLGA nanoparticles followed a multilayer adsorption behavior, although the Langmuir monolayer equation held at low concentrations of chitosan. The underlying reasons for adsorption of chitosan on PLGA nanoparticles were thought to be the cationic nature of chitosan, high surface energy and microporous non-uniform surface of PLGA nanoparticles.
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Affiliation(s)
- Chunqiang Guo
- Department of Biopharmaceutical Sciences, University of Illinois, Chicago, IL 60612, USA
| | - Richard A. Gemeinhart
- Department of Biopharmaceutical Sciences, University of Illinois, Chicago, IL 60612, USA
- Department of Bioengineering, University of Illinois, Chicago, IL 60612, USA
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Voltan R, Castaldello A, Brocca-Cofano E, Altavilla G, Caputo A, Laus M, Sparnacci K, Ensoli B, Spaccasassi S, Ballestri M, Tondelli L. Preparation and Characterization of Innovative Protein-coated Poly(Methylmethacrylate) Core-shell Nanoparticles for Vaccine Purposes. Pharm Res 2007; 24:1870-82. [PMID: 17476465 DOI: 10.1007/s11095-007-9310-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2007] [Accepted: 04/04/2007] [Indexed: 10/23/2022]
Abstract
PURPOSE This study aims at developing novel core-shell poly(methylmethacrylate) (PMMA) nanoparticles as a delivery system for protein vaccine candidates. MATERIALS AND METHODS Anionic nanoparticles consisting of a core of PMMA and a shell deriving from Eudragit L100/55 were prepared by an innovative synthetic method based on emulsion polymerization. The formed nanoparticles were characterized for size, surface charge and ability to reversibly bind two basic model proteins (Lysozyme, Trypsin) and a vaccine relevant antigen (HIV-1 Tat), by means of cell-free studies. Their in vitro toxicity and capability to preserve the biological activity of the HIV-1 Tat protein were studied in cell culture systems. Finally, their safety and immunogenicity were investigated in the mouse model. RESULTS The nanoparticles had smooth surface, spherical shape and uniform size distribution with a mean diameter of 220 nm. The shell is characterized by covalently bound carboxyl groups negatively charged at physiological pH, able to reversibly adsorb large amounts (up to 20% w/w) of basic proteins (Lysozyme, Trypsin and HIV-1 Tat), mainly through specific electrostatic interactions. The nanoparticles were stable, not toxic to the cells, protected the HIV-1 Tat protein from oxidation, thus preserving its biological activity and increasing its shelf-life, and efficiently delivered and released it intracellularly. In vivo experiments showed that they are well tolerated and elicit strong immune responses against the delivered antigen in mice. CONCLUSIONS This study demonstrates that these new nanoparticles provide a versatile platform for protein surface adsorption and a promising delivery system particularly when the maintenance of the biologically active conformation is required for vaccine efficacy.
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Affiliation(s)
- Rebecca Voltan
- Department of Histology, Microbiology and Medical Biotechnology, Section of Microbiology, University of Padova, Via A. Gabelli 63, 35122, Padova, Italy
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Hirota K, Hasegawa T, Hinata H, Ito F, Inagawa H, Kochi C, Soma GI, Makino K, Terada H. Optimum conditions for efficient phagocytosis of rifampicin-loaded PLGA microspheres by alveolar macrophages. J Control Release 2007; 119:69-76. [PMID: 17335927 DOI: 10.1016/j.jconrel.2007.01.013] [Citation(s) in RCA: 126] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2006] [Revised: 01/23/2007] [Accepted: 01/24/2007] [Indexed: 10/23/2022]
Abstract
We examined the phagocytic activities of alveolar macrophages (NR8383 cells) toward poly(lactic-co-glycolic) acid (PLGA) microspheres (MS) loaded with the anti-tuberculosis agent rifampicin (RFP), the sizes of which were between 1 microm and 10 microm. We found that 1) the phagocytosis was dependent greatly on the particle size and the number of particles added; 2) macrophages phagocytosed considerably the PLGA microspheres loaded with RFP, the diameter of which was between 1 microm and 6 microm, but took up few 10-microm particles; 3) the population of the macrophages that phagocytosed 1-microm or 3-microm particles was larger than that of those phagocytosed 6- or 10-microm particles; 4) a considerable population of macrophages were not able to phagocytose even the 1- and 3-microm particles; 5) the most efficient deliveries of RFP into each macrophage cell and a large population of macrophages were achieved by the phagocytosis of 3-microm particles; and 6) phagocytosis did not affect macrophage viability in 4 h after the start of phagocytosis.
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Affiliation(s)
- Keiji Hirota
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki Noda, Chiba 278-8510, Japan
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Schöll I, Kopp T, Bohle B, Jensen-Jarolim E. Biodegradable PLGA Particles for Improved Systemic and Mucosal Treatment of Type I Allergy. Immunol Allergy Clin North Am 2006; 26:349-64, ix. [PMID: 16701149 DOI: 10.1016/j.iac.2006.02.007] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Although allergen immunotherapy is basically a story of success, it still needs improvement. The goal of this study was to optimize parenteral and oral allergen formulations through using the biocompatible polymer of lactic and glycolic acid (PLGA). Subcutaneous application of birch pollen allergen Bet v 1 encapsulated in nanoparticles biased the immune response toward Th1 in allergic mice and did not elicit granuloma formation in mice and in human volunteers. When oral immunotherapy of mice was tried with birch pollen-filled PLGA microparticles, mucosal targeting was indispensable for achieving any immune response, and targeting of M-cells was necessary for modulating an ongoing allergic response toward Th1. The authors suggest that biocompatible PLGA nano- or microparticles can be useful tools for upgrading therapy of type I allergy.
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Affiliation(s)
- Isabella Schöll
- Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
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Ataman-Onal Y, Munier S, Ganée A, Terrat C, Durand PY, Battail N, Martinon F, Le Grand R, Charles MH, Delair T, Verrier B. Surfactant-free anionic PLA nanoparticles coated with HIV-1 p24 protein induced enhanced cellular and humoral immune responses in various animal models. J Control Release 2006; 112:175-85. [PMID: 16563545 DOI: 10.1016/j.jconrel.2006.02.006] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2005] [Revised: 02/07/2006] [Accepted: 02/14/2006] [Indexed: 10/24/2022]
Abstract
Microparticles and nanoparticles prepared with poly(D,L-lactide-co-glycolide) (PLGA) or poly(D,L-lactide) (PLA) polymers represent a promising method for in vivo delivery of encapsulated peptide, protein or DNA antigens. However, one major issue that limits the potential of these delivery systems is the instability or the degradation of the entrapped antigen. Charged microparticles carrying surface adsorbed antigen were developed to resolve this problem and appear more suitable for vaccine applications. We describe here new anionic PLA nanoparticles obtained by the dialysis method that are absolutely surfactant-free, which makes them more appropriate for use in humans. The potency of this delivery system as a vaccine carrier was tested in various animal models using HIV-1 p24 protein. p24-coated PLA nanoparticles (p24/PLA) induced high antibody titres (>10(6)) in mice, rabbits and macaques. Moreover, p24/PLA nanoparticles elicited strong CTL responses and a Th1-biased cytokine release (IFNgamma, IL-2) in mice. p24 protein seemed to generate a more Th1-oriented response when administered coated onto the surface of PLA nanoparticles than adjuvanted with Freund's adjuvant. Most importantly, the ability of p24/PLA particles to induce Th1 responses was also confirmed in the macaque model, since high levels of IFNgamma-producing CD4+ T cells and CD8+ T cells could be detected by the ELISPOT assay. This protein delivery system confirms the potential of charged nanoparticles in the field of vaccine development.
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Affiliation(s)
- Yasemin Ataman-Onal
- FRE2736 CNRS-bioMérieux, IFR128 BioSciences Lyon-Gerland, Tour CERVI, 21, Avenue Tony Garnier, F-69365 Lyon 07, France
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Fischer S, Foerg C, Ellenberger S, Merkle HP, Gander B. One-step preparation of polyelectrolyte-coated PLGA microparticles and their functionalization with model ligands. J Control Release 2006; 111:135-44. [PMID: 16377017 DOI: 10.1016/j.jconrel.2005.11.015] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2005] [Revised: 11/15/2005] [Accepted: 11/21/2005] [Indexed: 11/19/2022]
Abstract
This work aimed at the development of a novel surfactant-free, one-step process for the concomitant formation of poly(lactide-co-glycolide) (PLGA) microparticles (MP) and surface coating with the polyelectrolyte chitosan, which is suitable for subsequent covalent conjugation of bioactive ligands. The technology is based on solvent extraction from an O/W-dispersion using a static micromixer. Surface coating occurred through interaction of the negatively charged, nascent PLGA MP with the polycationic chitosan, which was dissolved in the aqueous extraction fluid. Particles of 1-10 mum in diameter were produced with excellent reproducibility. The chitosan-coated PLGA MP were spherical and showed a smooth surface without pores, as demonstrated by scanning electron microscopy (SEM). The chitosan coatings were characterized by zeta potential measurements and X-ray photoelectron spectroscopy (XPS). The functional amino groups of chitosan were used to conjugate two model ligands to the coating, i.e. fluorescamine and NHS-PEG-biotin. The presence of the conjugated ligands was revealed by confocal laser scanning microscopy (CLSM) and fluorescence activated cell sorting (FACS). Evidence for biotinylation was demonstrated through binding of fluorescently labelled streptavidin. The developed platform technology is straightforward and flexible. Future studies will focus on the design of microparticulate carriers with bioactive surfaces, e.g. as antigen delivery systems.
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Affiliation(s)
- Stefan Fischer
- Institute of Pharmaceutical Sciences, ETH Zurich, 8093 Zurich, Switzerland
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Sapin A, Garcion E, Clavreul A, Lagarce F, Benoit JP, Menei P. Development of new polymer-based particulate systems for anti-glioma vaccination. Int J Pharm 2006; 309:1-5. [PMID: 16386390 DOI: 10.1016/j.ijpharm.2005.10.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2005] [Revised: 10/07/2005] [Accepted: 10/21/2005] [Indexed: 11/27/2022]
Abstract
Biodegradable and biocompatible microspheres represent a promising alternative to conventional adjuvants for anti-tumour vaccination. Focusing on glioma, we developed two poly(D,L-lactide-co-glycolide) (PLGA)-based particulate systems presenting tumour antigens associated with plasma membranes or with cell lysates. Glioma cell fractions were prepared for adsorption onto poly-D-lysine (PDL)-coated PLGA microspheres formulated using a double-emulsion procedure. Adsorption was followed by (125)I-radiolabelling, Western blot and confocal laser scanning microscopy. Only a panel (34%) of the proteins isolated from both cell fractions adsorbed onto PDL-coated PLGA microspheres. The integrity of the epitopes after loading was preserved, as shown by identification of plasma membrane and cytoplasmic markers. Finally, one of the major potential advantages of those particulate systems resides in the fact they not only serve as injectable adjuvant matrices presenting tumour antigens to antigen presenting cells, but also as potential reservoirs for controlled delivery of active immunostimulant molecules.
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Affiliation(s)
- A Sapin
- Inserm, U646, Université d'Angers, Angers F-49100, France
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Kwon YJ, Standley SM, Goh SL, Fréchet JM. Enhanced antigen presentation and immunostimulation of dendritic cells using acid-degradable cationic nanoparticles. J Control Release 2005; 105:199-212. [PMID: 15935507 PMCID: PMC7114674 DOI: 10.1016/j.jconrel.2005.02.027] [Citation(s) in RCA: 109] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2004] [Revised: 02/23/2005] [Accepted: 02/24/2005] [Indexed: 01/05/2023]
Abstract
Acid-degradable cationic nanoparticles encapsulating a model antigen (i.e., ovalbumin) were prepared by inverse microemulsion polymerization with acid-cleavable acetal cross-linkers. Incubation of these degradable nanoparticles with dendritic cells derived from bone marrow (BMDCs) resulted in the enhanced presentation of ovalbumin-derived peptides, as quantified by B3Z cells, a CD8+ T cell hybridoma. The cationic nature of the particles contributed to the increased surface endocytosis (or phagocytosis) observed with BMDCs, which is the first barrier to overcome for successful antigen delivery. The acid sensitivity of the particles served to direct more ovalbumin antigens to be processed into the appropriately trimmed peptide fragments and presented via the major histocompatibility complex (MHC) class I pathway following hydrolysis within the acidic lysosomes. It was also shown that adjuvant molecules such as unmethylated CpG oligonucleotides (CpG ODN) and anti-interleukin-10 oligonucleotides (AS10 ODN) could be co-delivered with the protein antigen for maximized cellular immune response.
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Affiliation(s)
| | | | | | - Jean M.J. Fréchet
- Corresponding author. Department of Chemistry, University of California, 718 Latimer Hall, Berkeley CA 94720-1460, United States. Tel.: +1 510 643 3077; fax: +1 510 643 3079.
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