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Ni D, Qing S, Ding H, Yue H, Yu D, Wang S, Luo N, Su Z, Wei W, Ma G. Biomimetically Engineered Demi-Bacteria Potentiate Vaccination against Cancer. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2017; 4:1700083. [PMID: 29051851 PMCID: PMC5644226 DOI: 10.1002/advs.201700083] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 04/21/2017] [Indexed: 05/04/2023]
Abstract
Failure in enhancing antigen immunogenicity has limited the development of cancer vaccine. Inspired by effective immune responses toward microorganisms, demi-bacteria (DB) from Bacillus are engineered as carriers for cancer vaccines. The explored hydrothermal treatment enables the Bacillus to preserve optimal pathogen morphology with intrinsic mannose receptor agonist. Meanwhile, the treated Bacillus can be further endowed with ideal hollow/porous structure for efficient accommodation of antigen and adjuvant, such as CpG. Therefore, this optimal engineered nanoarchitecture allows multiple immunostimulatory elements integrate in a pattern closely resembling that of bacterial pathogens. Such pathogen mimicry greatly enhances antigen uptake and cross-presentation, resulting in stronger immune activation suitable for cancer vaccines. Indeed, DB-based biomimetic vaccination in mice induces synergistic cellular and humoral immune responses, achieving potent therapeutic and preventive effects against cancer. Application of microorganism-sourced materials thus presents new opportunities for potent cancer therapy.
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Affiliation(s)
- Dezhi Ni
- State Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of Sciences1 North 2nd StreetZhongguancun, Haidian DistrictBeijing100190P. R. China
| | - Shuang Qing
- State Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of Sciences1 North 2nd StreetZhongguancun, Haidian DistrictBeijing100190P. R. China
- University of Chinese Academy of SciencesNo. 19A Yuquan RoadBeijing100049P. R. China
| | - Hui Ding
- University of Chinese Academy of SciencesNo. 19A Yuquan RoadBeijing100049P. R. China
| | - Hua Yue
- State Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of Sciences1 North 2nd StreetZhongguancun, Haidian DistrictBeijing100190P. R. China
| | - Di Yu
- Molecular Immunomodulation LaboratorySchool of Biomedical SciencesMonash UniversityClaytonVictoria3800Australia
| | - Shuang Wang
- State Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of Sciences1 North 2nd StreetZhongguancun, Haidian DistrictBeijing100190P. R. China
- University of Chinese Academy of SciencesNo. 19A Yuquan RoadBeijing100049P. R. China
| | - Nana Luo
- State Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of Sciences1 North 2nd StreetZhongguancun, Haidian DistrictBeijing100190P. R. China
| | - Zhiguo Su
- State Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of Sciences1 North 2nd StreetZhongguancun, Haidian DistrictBeijing100190P. R. China
| | - Wei Wei
- State Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of Sciences1 North 2nd StreetZhongguancun, Haidian DistrictBeijing100190P. R. China
| | - Guanghui Ma
- State Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of Sciences1 North 2nd StreetZhongguancun, Haidian DistrictBeijing100190P. R. China
- University of Chinese Academy of SciencesNo. 19A Yuquan RoadBeijing100049P. R. China
- Jiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing211816P. R. China
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2
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Ganda IS, Zhong Q, Hali M, Albuquerque RLC, Padilha FF, da Rocha SRP, Whittum-Hudson JA. Dendrimer-conjugated peptide vaccine enhances clearance of Chlamydia trachomatis genital infection. Int J Pharm 2017; 527:79-91. [PMID: 28546072 PMCID: PMC5522616 DOI: 10.1016/j.ijpharm.2017.05.045] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Revised: 05/07/2017] [Accepted: 05/21/2017] [Indexed: 12/12/2022]
Abstract
Peptide-based vaccines have emerged in recent years as promising candidates in the prevention of infectious diseases. However, there are many challenges to maintaining in vivo peptide stability and enhancement of peptide immunogenicity to generate protective immunity which enhances clearance of infections. Here, a dendrimer-based carrier system is proposed for peptide-based vaccine delivery, and shows its anti-microbial feasibility in a mouse model of Chlamydia trachomatis. Chlamydiae are the most prevalent sexually transmitted bacteria worldwide, and also the causal agent of trachoma, the leading cause of preventable infectious blindness. In spite of the prevalence of this infectious agent and the many previous vaccine-related studies, there is no vaccine commercially available. The carrier system proposed consists of generation 4, hydroxyl-terminated, polyamidoamine (PAMAM) dendrimers (G4OH), to which a peptide mimic of a chlamydial glycolipid antigen-Peptide 4 (Pep4, AFPQFRSATLLL) was conjugated through an ester bond. The ester bond between G4OH and Pep4 is expected to break down mainly in the intracellular environment for antigen presentation. Pep4 conjugated to dendrimer induced Chlamydia-specific serum antibodies after subcutaneous immunizations. Further, this new vaccine formulation significantly protected immunized animals from vaginal challenge with infectious Chlamydia trachomatis, and it reduced infectious loads and tissue (genital tract) damage. Pep4 conjugated to G4OH or only mixed with peptide provided enhanced protection compared to Pep4 and adjuvant (i.e. alum), suggesting a potential adjuvant effect of the PAMAM dendrimer. Combined, these results demonstrate that hydroxyl-terminated PAMAM dendrimer is a promising polymeric nanocarrier platform for the delivery of peptide vaccines and this approach has potential to be expanded to other infectious intracellular bacteria and viruses of public health significance.
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Affiliation(s)
- Ingrid S Ganda
- Biomaterials Laboratory, Technology and Research Institute, Tiradentes University, Aracaju, SE, 49032-490, Brazil; Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA; Departments of Immunology and Microbiology, Internal Medicine (Rheumatology), and Ophthalmology, School of Medicine, Wayne State University, Detroit, MI 48201, USA.
| | - Qian Zhong
- Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA.
| | - Mirabela Hali
- Departments of Immunology and Microbiology, Internal Medicine (Rheumatology), and Ophthalmology, School of Medicine, Wayne State University, Detroit, MI 48201, USA.
| | - Ricardo L C Albuquerque
- Laboratory of Morphology and Structural Biology, Technology and Research Institute, Tiradentes University, Aracaju, SE, 49032-490, Brazil.
| | - Francine F Padilha
- Biomaterials Laboratory, Technology and Research Institute, Tiradentes University, Aracaju, SE, 49032-490, Brazil.
| | - Sandro R P da Rocha
- Biomaterials Laboratory, Technology and Research Institute, Tiradentes University, Aracaju, SE, 49032-490, Brazil; Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA.
| | - Judith A Whittum-Hudson
- Departments of Immunology and Microbiology, Internal Medicine (Rheumatology), and Ophthalmology, School of Medicine, Wayne State University, Detroit, MI 48201, USA.
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3
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Black M, Trent A, Kostenko Y, Lee JS, Olive C, Tirrell M. Self-assembled peptide amphiphile micelles containing a cytotoxic T-cell epitope promote a protective immune response in vivo. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:3845-9. [PMID: 22550019 DOI: 10.1002/adma.201200209] [Citation(s) in RCA: 173] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2012] [Revised: 02/20/2012] [Indexed: 05/20/2023]
MESH Headings
- Adaptive Immunity
- Amino Acid Sequence
- Animals
- Drug Delivery Systems
- Epitopes, T-Lymphocyte/administration & dosage
- Epitopes, T-Lymphocyte/chemistry
- Female
- HEK293 Cells
- Humans
- Lipopeptides/administration & dosage
- Lipopeptides/chemistry
- Lipopeptides/immunology
- Mice
- Mice, Inbred C57BL
- Micelles
- Models, Molecular
- Molecular Structure
- Neoplasms, Experimental/immunology
- Neoplasms, Experimental/pathology
- Neoplasms, Experimental/therapy
- Ovalbumin/immunology
- Surface-Active Agents/administration & dosage
- Surface-Active Agents/chemistry
- T-Lymphocytes, Cytotoxic/immunology
- Vaccines, Subunit/administration & dosage
- Vaccines, Subunit/chemistry
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Affiliation(s)
- Matthew Black
- Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
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4
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Receptor-based biomimetic NVP/DMA contact lenses for loading/eluting carbonic anhydrase inhibitors. J Memb Sci 2011. [DOI: 10.1016/j.memsci.2011.08.030] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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5
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Bharatwaj B, Wu L, Whittum-Hudson JA, da Rocha SRP. The potential for the noninvasive delivery of polymeric nanocarriers using propellant-based inhalers in the treatment of Chlamydial respiratory infections. Biomaterials 2010; 31:7376-85. [PMID: 20615546 DOI: 10.1016/j.biomaterials.2010.06.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Accepted: 06/01/2010] [Indexed: 10/19/2022]
Abstract
A novel strategy for pulmonary delivery of polymeric nanocarriers (NCs) pressurized-metered dose inhalers (pMDIs) is reported in this work. Core-shell particles consisting of a water soluble, hydrofluoroalkane(HFA)-philic biodegradable copolymer of chitosan and poly(lactic acid), and a core of poly(d,l-lactide-co-glycolide) (PLGA) NCs were prepared by a modified emulsification-diffusion methodology. Dispersions of the core-shell particles in HFA propellant revealed enhanced physical stability compared to polymeric NCs alone, and more importantly, excellent aerosol characteristics as determined by inertial impaction studies. Confocal microscopy revealed that the polymeric NCs from such core-shell particles are capable not only to be taken up by Calu-3 (airway epithelial) cells that have been infected with Chlamydia pneumoniae, an intracellular pathogen, but are also internalized within chlamydial inclusions. Our results suggest that the proposed methodology can be used as a general platform for the delivery of polymeric NCs to the respiratory tract using the inexpensive pMDIs, and that such an approach may be used to target and deliver drugs to treat chlamydial-related infections.
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Affiliation(s)
- Balaji Bharatwaj
- Chemical Engineering and Materials Science, College of Engineering, Detroit, USA
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6
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Black M, Trent A, Tirrell M, Olive C. Advances in the design and delivery of peptide subunit vaccines with a focus on toll-like receptor agonists. Expert Rev Vaccines 2010; 9:157-73. [PMID: 20109027 DOI: 10.1586/erv.09.160] [Citation(s) in RCA: 132] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Considerable success has been made with many peptide antigen formulations, and peptide-based vaccines are emerging as the next generation of prophylactic and remedial immunotherapy. However, finding an optimal platform balancing all of the requirements for an effective, specific and safe immune response remains a major challenge for many infectious and chronic diseases. This review outlines how peptide immunogenicity is influenced by the way in which peptides are presented to the immune system, underscoring the need for multifunctional delivery systems that couple antigen and adjuvant into a single construct. Particular attention is given to the ability of Toll-like receptor agonists to act as adjuvants. A survey of recent approaches to developing peptide antigen delivery systems is given, many of which incorporate Toll-like receptor agonists into the design.
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Affiliation(s)
- Matthew Black
- University of California, Santa Barbara, CA 93106, USA.
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7
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Gonzalez-Fernandez M, Torres T, Andrés-Vergés M, Costo R, de la Presa P, Serna C, Morales M, Marquina C, Ibarra M, Goya G. Magnetic nanoparticles for power absorption: Optimizing size, shape and magnetic properties. J SOLID STATE CHEM 2009. [DOI: 10.1016/j.jssc.2009.07.047] [Citation(s) in RCA: 116] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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8
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Lo CT, Van Tassel PR, Saltzman WM. Simultaneous release of multiple molecules from poly(lactide-co-glycolide) nanoparticles assembled onto medical devices. Biomaterials 2009; 30:4889-97. [PMID: 19592089 DOI: 10.1016/j.biomaterials.2009.05.074] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2009] [Accepted: 05/21/2009] [Indexed: 10/20/2022]
Abstract
Cell and tissue responses to implanted biomaterials often limit their effectiveness and lifetime. This is particularly true for materials implanted into the brain. We present here a new approach for the modification of materials to enable release of multiple agents, which might be useful in modulating tissue responses, without changing the properties of the underlying material, in this case, a silicon probe. Poly(lactide-co-glycolide) nanoparticles (NPs) were assembled onto silicon probe surfaces by electrostatic interactions. Charged NPs were fabricated by altering the properties of the surfactant. NPs formed with poly(ethylene-alt-maleic anhydride) (PEMA) were strongly negatively charged; these NPs assembled onto probes best when suspended at nearly physiological conditions (surface density approximately 83,600+/-3000 particles/mm(2)). The percentage of surface area coverage by the NPs was estimated to be approximately 13% and was maintained over two weeks during constant exposure to PBS. Multiple fluorescent NP populations were attached to the same probe to allow visualization of simultaneous delivery of multiple agents by fluorescence microscopy. Release from NP coatings was reproducible and controllable. The distinct release profiles of each agent from the coatings were preserved upon attachment to the surfaces. The unique feature of this new system is that NPs encapsulating various molecules (i.e. drugs, proteins, or DNA) can be fabricated separately, in advance, and simply mixed prior to attachment. The versatility of this delivery system, therefore, makes it suitable for many applications.
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Affiliation(s)
- Catherine T Lo
- Department of Biomedical Engineering, Yale University, Malone Engineering Center, Room 414, 55 Prospect Street, New Haven, CT 06511, USA
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9
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Bumgarner GW, Shashidharamurthy R, Nagarajan S, D'Souza MJ, Selvaraj P. Surface engineering of microparticles by novel protein transfer for targeted antigen/drug delivery. J Control Release 2009; 137:90-7. [DOI: 10.1016/j.jconrel.2009.03.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2009] [Accepted: 03/17/2009] [Indexed: 10/21/2022]
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10
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Pan J, Xue X, Wang J, Xie H, Wu Z. Recognition property and preparation of Staphylococcus aureus protein A-imprinted polyacrylamide polymers by inverse-phase suspension and bulk polymerization. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.04.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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11
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Xue X, Pan J, Xie H, Wang J, Zhang S. Specific recognition of staphylococcus aureus by staphylococcus aureus protein A-imprinted polymers. REACT FUNCT POLYM 2009. [DOI: 10.1016/j.reactfunctpolym.2008.12.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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12
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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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13
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Bergmann NM, Peppas NA. Molecularly imprinted polymers with specific recognition for macromolecules and proteins. Prog Polym Sci 2008. [DOI: 10.1016/j.progpolymsci.2007.09.004] [Citation(s) in RCA: 139] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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14
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Silva GA, Ducheyne P, Reis RL. Materials in particulate form for tissue engineering. 1. Basic concepts. J Tissue Eng Regen Med 2007; 1:4-24. [DOI: 10.1002/term.2] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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15
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Phagocytosis of poly(L-lysine)-graft-poly (ethylene glycol) coated microspheres by antigen presenting cells: Impact of grafting ratio and poly (ethylene glycol) chain length on cellular recognition. Biointerphases 2006; 1:123-33. [DOI: 10.1116/1.2409645] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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16
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Jain S, Yap WT, Irvine DJ. Synthesis of protein-loaded hydrogel particles in an aqueous two-phase system for coincident antigen and CpG oligonucleotide delivery to antigen-presenting cells. Biomacromolecules 2005; 6:2590-600. [PMID: 16153096 DOI: 10.1021/bm0503221] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Materials that effectively deliver protein antigens together with activating ligands to antigen-presenting cells are sought for improved nonviral vaccines. To this end, we synthesized protein-loaded poly(ethylene glycol) (PEG)-based hydrogel particles by cross-linking PEG within the polymer-rich phase of an emulsion formed by a poly(ethylene oxide-b-propylene oxide-b-ethylene oxide) triblock copolymer in saturated aqueous salt solution. These particles (500-nm diameter) contained high levels of encapsulated protein (approximately 75% of dry mass), which was selectively released by proteolytic enzymes normally present in the phagosomal/endosomal compartments of dendritic cells (DCs). For co-delivery of cellular activation signals, gel particles were surface-modified by sequential adsorption of poly(l-arginine) and CpG oligonucleotides. DCs pulsed with protein-loaded particles activated naïve T cells in vitro approximately 10-fold more efficiently than DCs incubated with soluble protein. This organic solvent-free strategy for protein encapsulation within submicron-sized hydrophilic particles is attractive for macromolecule delivery to a variety of phagocytic and nonphagocytic cells.
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Affiliation(s)
- Siddhartha Jain
- Biological Engineering Division, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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17
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Shakweh M, Ponchel G, Fattal E. Particle uptake by Peyer's patches: a pathway for drug and vaccine delivery. Expert Opin Drug Deliv 2005; 1:141-63. [PMID: 16296726 DOI: 10.1517/17425247.1.1.141] [Citation(s) in RCA: 120] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Particle uptake by Peyer's patches offers the possibility of tailoring vaccines that can be delivered orally. However, particle uptake by the follicle-associated epithelium in the gastrointestinal tract depends on several different factors that are the physicochemical properties of the particles, the physiopathological state of the animal, the analytical method used to evaluate the uptake and finally the experimental model. These parameters do not allow a clear idea about the optimal conditions to target the Peyer's patches. The goal of this review is to clarify the role of each factor in this uptake.
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Affiliation(s)
- Monjed Shakweh
- University of Paris-South, Faculty of Pharmacy, UMR CNRS 8612, 5 rue Jean-Batiste Clement, 92290 Chatenay-Malabry Cedex, France
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18
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Smyth SH, Doyle-McCullough M, Cox OT, Carr KE. Effect of reproductive status on uptake of latex microparticles in rat small intestine. Life Sci 2005; 77:3287-305. [PMID: 16005026 DOI: 10.1016/j.lfs.2005.04.030] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2004] [Accepted: 04/25/2005] [Indexed: 02/06/2023]
Abstract
This study investigates whether pregnancy or lactation affects microparticle uptake across the small intestinal mucosal barrier, since aspects of gastrointestinal physiology such as motility may be altered in these conditions. It also reports on validation of the model by several methods and discusses the findings in relation to possible mechanisms. Anaesthetised, pregnant, lactating, virgin female or male adult rats were gavaged with fluorescent latex microparticles. The small intestine was removed and fixed either 5 or 30 min later and successive segments of equal length were examined with fluorescence microscopy. Minor adjustments were made to experimental methods to explore details of the uptake mechanism. Control sections contained no particles. All experimental samples showed luminal and surface particles and also contained particles within the tissue, most associated with villous absorptive enterocytes. Particle uptake was greatest at the 30-min time-point, when maximum uptake was usually in the proximal jejunum; although in the early lactating group, this was shifted distally. Total tissue uptake was increased in pregnant and early lactating groups, mainly at villous absorptive and mucus-secreting cells. Accumulation and progression of particles was reflected in increased numbers in the lamina propria. These data were validated by several methods, including particle detection in the blood and mesenteric lymph nodes in some groups. At both time-points, uptake profiles for pregnancy and early lactation differed from those of other groups, implying possible links between particle uptake and hormone levels, surface mucus and tight junction patency.
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Affiliation(s)
- Sharon H Smyth
- The Queen's University of Belfast, Belfast, BT7 1NN, United Kingdom.
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19
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des Rieux A, Ragnarsson EGE, Gullberg E, Préat V, Schneider YJ, Artursson P. Transport of nanoparticles across an in vitro model of the human intestinal follicle associated epithelium. Eur J Pharm Sci 2005; 25:455-65. [PMID: 15946828 DOI: 10.1016/j.ejps.2005.04.015] [Citation(s) in RCA: 229] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2004] [Revised: 03/15/2005] [Accepted: 04/14/2005] [Indexed: 11/21/2022]
Abstract
An in vitro model of the human follicle associated epithelium (FAE) was characterized and the influence of nanoparticle properties on the transcellular transport across the in vitro model was investigated. The model was established by co-culturing Caco-2 and Raji cells, with Caco-2 cells alone as control. The conversion of Caco-2 cells to follicle associated epithelium (FAE) like cells was monitored by following the surface expression of beta1-integrins (immunofluorescence) and nanoparticle transport (flow cytometry). The influence of the nanoparticle concentration at the apical side, temperature, size and surface properties of nanoparticles on transport was evaluated, as well as the influence of transport conditions. The conversion of Caco-2 cells into FAE-like cells occurred. The transport was concentration, temperature and size-dependent. Aminated nanoparticles were more efficiently transported than carboxylated nanoparticles, suggesting a role of nanoparticle surface functional groups and hydrophobicity, possibly leading to a different pattern of protein adsorption at their surface. In conclusion, this in vitro model is a promising tool to study the role of M cells in transintestinal nanoparticle transport, as well as to evaluate new drug delivery systems.
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Affiliation(s)
- Anne des Rieux
- Department of Pharmacy, Uppsala University, Uppsala, Sweden.
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20
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Luginbuehl V, Meinel L, Merkle HP, Gander B. Localized delivery of growth factors for bone repair. Eur J Pharm Biopharm 2005; 58:197-208. [PMID: 15296949 DOI: 10.1016/j.ejpb.2004.03.004] [Citation(s) in RCA: 239] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2004] [Accepted: 02/16/2004] [Indexed: 11/16/2022]
Abstract
Delivery of growth factors for tissue (e.g. bone, cartilage) or cell repair (e.g. nerves) is about to gain important potential as a future therapeutic tool. Depending on the targeted cell type and its state of differentiation, growth factors can activate or regulate a variety of cellular functions. Therefore, strictly localized delivery regimens at well-defined kinetics appear to be logical prerequisites to assure safe and efficacious therapeutic use of such factors and avoid unwanted side effects and toxicity, a major hurdle in the clinical development of growth factor therapies so far. This review summarizes various approaches for localized growth factor delivery as focused on bone repair. Similar considerations may apply to other growth factors and therapeutic indications. Considering the vast number of preclinical studies reported in the area of growth factor-assisted bone repair, it surprises though that only two medical products for bone repair have so far been commercialized, both consisting of a collagen matrix impregnated with a bone morphogenetic protein. The marked diversity of the reported growth factors, delivery concepts and not yet standardized animal models adds to the complexity to learn from past preclinical studies presented in the literature. Nonetheless, it is now firmly established from the available information that the type, dose and delivery kinetics of growth factors all play a decisive role for the therapeutic success of any such approach. Very likely, all of these parameters have to be adapted and optimized for each animal model or clinical case. In the future, systems for localized growth factor delivery thus need to be designed in such a way that their modular components are readily adaptable to the individual pathology. To make such customized systems feasible, close cooperative networks of biomedical and biomaterials engineers, pharmaceutical scientists, chemists, biologists and clinicians need to be established.
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Affiliation(s)
- Vera Luginbuehl
- Institute of Pharmaceutical Sciences, Swiss Federal Institute of Technology Zurich (ETH Zurich), Zurich, Switzerland
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21
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Fahmy TM, Samstein RM, Harness CC, Mark Saltzman W. Surface modification of biodegradable polyesters with fatty acid conjugates for improved drug targeting. Biomaterials 2005; 26:5727-36. [PMID: 15878378 DOI: 10.1016/j.biomaterials.2005.02.025] [Citation(s) in RCA: 154] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2004] [Accepted: 02/14/2005] [Indexed: 12/18/2022]
Abstract
We describe a general method for incorporating target ligands into the surface of biocompatible polyester poly(lactic-co-glycolic acid) (PLGA) 50/50 materials using fatty acids. Avidin-fatty acid conjugates were prepared and efficiently incorporated into PLGA. Avidin was chosen as an adaptor protein to facilitate the attachment of a variety of biotinylated ligands. We show that fatty acid preferentially associates with the hydrophobic PLGA matrix, rather than the external aqueous environment, facilitating a prolonged presentation of avidin over several weeks. We successfully applied this approach in both microspheres encapsulating a model protein, bovine serum albumin, and PLGA scaffolds fabricated by a salt-leaching method. Because of its ease, generality and flexibility, this strategy promises widespread utility in modifying the surface of PLGA-based materials for applications in drug delivery and tissue engineering.
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Affiliation(s)
- Tarek M Fahmy
- Department of Biomedical Engineering, Yale University, PO Box 208284, New Haven, CT 06520, USA.
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Tabrizi CA, Walcher P, Mayr UB, Stiedl T, Binder M, McGrath J, Lubitz W. Bacterial ghosts – biological particles as delivery systems for antigens, nucleic acids and drugs. Curr Opin Biotechnol 2004; 15:530-7. [PMID: 15560979 DOI: 10.1016/j.copbio.2004.10.004] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Despite the exponential rate of discovery of new antigens and DNA vaccines resulting from modern molecular biology and proteomics, the lack of effective delivery technology is a major limiting factor in their application. The bacterial ghost system represents a platform technology for antigen, nucleic acid and drug delivery. Bacterial ghosts have significant advantages over other engineered biological delivery particles, owing to their intrinsic cellular and tissue tropic abilities, ease of production and the fact that they can be stored and processed without the need for refrigeration. These particles have found both veterinary and medical applications for the vaccination and treatment of tumors and various infectious diseases.
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Affiliation(s)
- Chakameh Azimpour Tabrizi
- Institute of Microbiology and Genetics, Section Microbiology and Biotechnology, University of Vienna, Althanstrasse 14, UZAII, 2B 522, A-1090 Vienna, Austria
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Abstract
Recent developments in the application of micro- and nanosystems for drug administration include a diverse range of new materials and methods. New approaches include the on-demand activation of molecular interactions, novel diffusion-controlled delivery devices, nanostructured 'smart' surfaces and materials, and prospects for coupling drug delivery to sensors and implants. Micro- and nanotechnologies are enabling the design of novel methods such as radio-frequency addressing of individual molecules or the suppression of immune response to a release device. Current challenges include the need to balance the small scale of the devices with the quantities of drugs that are clinically necessary, the requirement for more stable sensor platforms, and the development of methods to evaluate these new materials and devices for safety and efficacy.
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Affiliation(s)
- David A LaVan
- Department of Mechanical Engineering, Yale University, New Haven, Connecticut 06520-8284, USA
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