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Katawale S, Tank S, Dhaygude H, Holm R, Shah S, Shinde U, Shidhaye S, Aswal V, Kumar S, Nagarsenker M. Impact of formulation parameters on self-assembled liposomes (LeciPlex® III): A detailed investigation. Int J Pharm 2024; 657:124147. [PMID: 38657715 DOI: 10.1016/j.ijpharm.2024.124147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 03/30/2024] [Accepted: 04/21/2024] [Indexed: 04/26/2024]
Abstract
The present study investigated the feasibility of fabricating self-assembled liposomes, LeciPlex®, a phospholipid-based vesicular nanocarrier using cationic, anionic, and nonionic stabilizers. The phospholipid investigated was soy phosphatidylcholine and the nano-precipitation method based on solvent diffusion was applied as the fabrication technique of liposomes in this study. The effects of various formulation variables, such as lipid and stabilizer concentration, total solid concentration, and solvent type on the self-assembly of vesicles were studied for physical characterization including particle size analysis, differential scanning calorimetry, viscosity, optical transmittance, transmission electron microscopy, and small angle neutron scattering. All three LeciPlex® systems exhibited a direct relationship between particle size and phospholipid concentration. The two categoric variables, solvent, and stabilizer used to prepare LeciPlex® demonstrated a significant effect on particle size for all three LeciPlex® systems. Small angle neutron scattering, and optical transmittance confirmed the formation of micellar systems at a phospholipid: stabilizer ratio of 1:2 and vesicular systems at a ratio of 2:1 for the systems stabilized with anionic and nonionic surfactants. In contrast to this, the LeciPlex® formed with the cationic stabilizer Dioctadecyldimethylammonium bromide (DODAB), formed vesicles at both ratios. From these investigations, it was clear that the formulation space for LeciPlex® was diversified by the addition of cationic, anionic, and non-ionic stabilizers.
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Affiliation(s)
- Saurabh Katawale
- Department of Pharmaceutics, Bombay College of Pharmacy, Kalina, Santacruz, Mumbai 400 098, India
| | - Shivali Tank
- Department of Pharmaceutics, VES College of Pharmacy, Chembur, Mumbai 400 074, India
| | - Harshali Dhaygude
- Department of Pharmaceutics, Bombay College of Pharmacy, Kalina, Santacruz, Mumbai 400 098, India
| | - René Holm
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55 5230, Odense, Denmark
| | - Sanket Shah
- Therapeutics Development and Supply, Janssen Pharmaceutica NV, A Johnson & Johnson Company, Turnhoutseweg 30 2340, Beerse, Belgium
| | - Ujwala Shinde
- Department of Pharmaceutics, Bombay College of Pharmacy, Kalina, Santacruz, Mumbai 400 098, India
| | - Supriya Shidhaye
- Department of Pharmaceutics, VES College of Pharmacy, Chembur, Mumbai 400 074, India
| | - Vinod Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India; Homi Bhabha National Institute, Mumbai 400 094, India
| | - Sugam Kumar
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India; Homi Bhabha National Institute, Mumbai 400 094, India
| | - Mangal Nagarsenker
- Department of Pharmaceutics, Bombay College of Pharmacy, Kalina, Santacruz, Mumbai 400 098, India; Department of Pharmaceutics, VES College of Pharmacy, Chembur, Mumbai 400 074, India.
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Izeli Portilho A, Araujo Correa V, Dos Santos Cirqueira C, De Gaspari E. Intranasal and Intramuscular Immunization with Outer Membrane Vesicles from Serogroup C Meningococci Induced Functional Antibodies and Immunologic Memory. Immunol Invest 2022; 51:2066-2085. [PMID: 35950702 DOI: 10.1080/08820139.2022.2107931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Immunization is the key to prevent invasive meningococcal disease (IMD), caused by Neisseria meningitidis. Outer membrane vesicles (OMVs) can be used as meningococcal antigens. METHODS Isogenic mice A/Sn (H2a) were immunized with low antigenic doses of OMVs of an N. meningitidis C:2a:P1.5 strain, via intranasal/intramuscular route, adjuvanted by cholera toxin subunit B (CTB) or via intramuscular route only, adjuvanted by aluminium hydroxide (AH). Mice were followed until old age and humoral and cellular responses were assessed by ELISA, Immunoblotting, Dot-blot, Serum-bactericidal assay, Immunohistochemistry and ELISpot. RESULTS OMV+CTB and OMV+AH groups presented statistically higher antibodies titers, which persisted until middle and old ages. IgG isotypes point to a Th2 type of response. Avidity indexes were considered high, regardless of adjuvant use, but only groups immunized with OMVs and adjuvants (OMV+CTB and OMV+AH) presented bactericidal activity. The antibodies recognized antigens of molecular weights attributed to porin and cross-reactivity proteins. Although the spleen of old mice did not present differences in immunohistochemistry marking of CD68+, CD4+, CD79+ and CD25+ cells, splenocytes of immune groups secreted IL-4 and IL-17 when stimulated with OMVs and meningococcal C polysaccharide. CONCLUSION We concluded that both adjuvants, CTB and AH, improved the immunogenicity of low doses of OMVs and contributed to a persistent immune response. Even though AH is well established in the vaccinology area, CTB seems to be a promising adjuvant candidate for meningococcal vaccines: it is suitable for mucosal delivery and supports a Th2 type of response. Therefore, OMVs are still a relevant vaccine platform.
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Affiliation(s)
- Amanda Izeli Portilho
- Immunology Center, Adolfo Lutz Institute, São Paulo, Brazil.,Graduate Program Interunits in Biotechnology, University of São Paulo, São Paulo, Brazil
| | - Victor Araujo Correa
- Immunology Center, Adolfo Lutz Institute, São Paulo, Brazil.,Graduate Program Interunits in Biotechnology, University of São Paulo, São Paulo, Brazil
| | | | - Elizabeth De Gaspari
- Immunology Center, Adolfo Lutz Institute, São Paulo, Brazil.,Graduate Program Interunits in Biotechnology, University of São Paulo, São Paulo, Brazil
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Correa VA, Portilho AI, De Gaspari E. Immunological Effects of Dimethyldioctadecylammonium Bromide and Saponin as Adjuvants for Outer Membrane Vesicles from Neisseria meningitidis. Diseases 2022; 10:diseases10030046. [PMID: 35892740 PMCID: PMC9326571 DOI: 10.3390/diseases10030046] [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: 05/06/2022] [Revised: 06/13/2022] [Accepted: 06/29/2022] [Indexed: 11/29/2022] Open
Abstract
The meningococcal disease is a global health threat, but is preventable through vaccination. Adjuvants improve meningococcal vaccines and are able to trigger different aspects of the immune response. The present work evaluated the immune response of mice against Neisseria meningitidis outer membrane vesicles (OMV) complexed with the adjuvants aluminium hydroxide (AH), via subcutaneous route; and dimethyldioctadecylammonium bromide (DDA) or Saponin (Sap), via intranasal/subcutaneous routes. ELISA demonstrated that all adjuvants increased IgG titers after the booster dose, remaining elevated for 18 months. Additionally, adjuvants increased the avidity of the antibodies and the bactericidal titer: OMVs alone were bactericidal until 1:4 dilution but, when adjuvanted by Alum, DDA or Sap, it increased to 1/32. DDA and Sap increased all IgG isotypes, while AH improved IgG1 and IgG2a levels. Thus, Sap led to the recognition of more proteins in Immunoblot, followed by DDA and AH. Sap and AH induced higher IL-4 and IL-17 release, respectively. The use of adjuvants improved both cellular and humoral immune response, however, each adjuvant contributed to particular parameters. This demonstrates the importance of studying different adjuvant options and their suitability to stimulate different immune mechanisms, modulating the immune response.
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Affiliation(s)
- Victor Araujo Correa
- Immunology Center, Adolfo Lutz Institute, Av. Dr. Arnaldo, 355, 11th Floor, Room 1116, Cerqueira César, São Paulo 01246-902, SP, Brazil; (V.A.C.); (A.I.P.)
- Graduate Program Interunits in Biotechnology, Biomedical Sciences Institute, São Paulo University, Av. Prof. Lineu Prestes, 2415, ICB Hall III, Cidade Universitária, São Paulo 05508-900, SP, Brazil
| | - Amanda Izeli Portilho
- Immunology Center, Adolfo Lutz Institute, Av. Dr. Arnaldo, 355, 11th Floor, Room 1116, Cerqueira César, São Paulo 01246-902, SP, Brazil; (V.A.C.); (A.I.P.)
- Graduate Program Interunits in Biotechnology, Biomedical Sciences Institute, São Paulo University, Av. Prof. Lineu Prestes, 2415, ICB Hall III, Cidade Universitária, São Paulo 05508-900, SP, Brazil
| | - Elizabeth De Gaspari
- Immunology Center, Adolfo Lutz Institute, Av. Dr. Arnaldo, 355, 11th Floor, Room 1116, Cerqueira César, São Paulo 01246-902, SP, Brazil; (V.A.C.); (A.I.P.)
- Graduate Program Interunits in Biotechnology, Biomedical Sciences Institute, São Paulo University, Av. Prof. Lineu Prestes, 2415, ICB Hall III, Cidade Universitária, São Paulo 05508-900, SP, Brazil
- Correspondence: ; Tel.: +55-11-3068-2898
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Gaspar EB, Prudencio CR, De Gaspari E. Experimental studies using OMV in a new platform of SARS-CoV-2 vaccines. Hum Vaccin Immunother 2021; 17:2965-2968. [PMID: 33950776 PMCID: PMC8108191 DOI: 10.1080/21645515.2021.1920272] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 04/15/2021] [Indexed: 12/26/2022] Open
Abstract
Although COVID-19 vaccines have recently been approved for emergency use, search for new vaccines are still urgent, since the access of the countries, especially the poorest, to the vaccines, has shown to be slower than the necessary to rapidly control the pandemic. We proposed a novel platform for vaccine using recombinant receptor binding domain (rRBD) from Sars-Cov-2 spike protein and Neisseria meningitidis outer membrane vesicles (OMVs). The antigen preparation produced a humoral and cellular immune response. Taken together our findings suggest a good immunostimulatory patter in response to immunization with rRBD plus N. meningitidis OMV.
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Affiliation(s)
- Emanuelle B. Gaspar
- Animal Health Department, Embrapa Southern Region Animal Husbandry, Bagé, Brazil
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Trzewikoswki de Lima G, Rodrigues TS, Portilho AI, Correa VA, Gaspar EB, De Gaspari E. Immune responses of meningococcal B outer membrane vesicles in middle-aged mice. Pathog Dis 2021; 78:5868766. [PMID: 32639524 DOI: 10.1093/femspd/ftaa028] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 07/07/2020] [Indexed: 01/18/2023] Open
Abstract
The elderly are more likely to die when infected with Neisseria meningitidis. Aging is associated with immune system dysfunctions that impair responses to vaccines and infections. Therefore, immunization of middle-aged individuals could be beneficial. This study aims to evaluate the immunogenicity of N. meningitidis B outer membrane vesicles (OMVs) complexed to two different adjuvants. Middle-aged BALB/c and A/Sn mice were immunized and subsequent immune response was assessed by ELISA, immunoblotting and ELISpot. IgG levels were similar between the animals immunized with OMVs complexed to adjuvants. A total of 235 days after the last immunization only A/Sn mice presented higher IgG levels than those observed in the baseline, especially the group immunized with OMVs and aluminum hydroxide. The predominant IgG subclasses were IgG2a and IgG2b. Immunization with the three-dose regimen generated IgG antibodies that recognized a variety of antigens present in the homologous and heterologous meningococcal OMVs evaluated. There was an increase in the frequency of antigen-specific IFN-γ secreting splenocytes, after in vitro stimulation, in mice immunized with OMVs and adjuvants compared to the control group, almost 1 year after the last immunization. Both adjuvants showed similar performance. Immunization of middle-aged mice has generated a robust immune response and it appears to be advantageous.
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Affiliation(s)
- Gabriela Trzewikoswki de Lima
- Department of Immunology, Adolfo Lutz Institute, Av. Dr. Arnaldo 355, 11 floor, Sao Paulo, SP, Brazil.,Interunits Post-Graduate Program in Biotechnology, University of Sao Paulo, Sao Paulo, SP, Brazil
| | - Thais Sousa Rodrigues
- Department of Immunology, Adolfo Lutz Institute, Av. Dr. Arnaldo 355, 11 floor, Sao Paulo, SP, Brazil
| | - Amanda Izeli Portilho
- Department of Immunology, Adolfo Lutz Institute, Av. Dr. Arnaldo 355, 11 floor, Sao Paulo, SP, Brazil.,Interunits Post-Graduate Program in Biotechnology, University of Sao Paulo, Sao Paulo, SP, Brazil
| | - Victor Araujo Correa
- Department of Immunology, Adolfo Lutz Institute, Av. Dr. Arnaldo 355, 11 floor, Sao Paulo, SP, Brazil.,Interunits Post-Graduate Program in Biotechnology, University of Sao Paulo, Sao Paulo, SP, Brazil
| | | | - Elizabeth De Gaspari
- Department of Immunology, Adolfo Lutz Institute, Av. Dr. Arnaldo 355, 11 floor, Sao Paulo, SP, Brazil.,Interunits Post-Graduate Program in Biotechnology, University of Sao Paulo, Sao Paulo, SP, Brazil
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Rinaldi FM, Gaspar EB, Brito LT, Gaspari ED. Immunogenicity of antigens from outer membrane vesicles of Neisseria meningitidis associated with bilayer fragment of dioctadecyldimethylammonium in Swiss adult mice. Clin Exp Vaccine Res 2021; 10:106-122. [PMID: 34222123 PMCID: PMC8217576 DOI: 10.7774/cevr.2021.10.2.106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 01/29/2021] [Indexed: 11/15/2022] Open
Abstract
Purpose In the present study, meningococcal serogroup B outer membrane vesicles (OMVs) were associated with bilayer fragments of a cationic lipid, dioctadecyldimethylammonium (DDA-BF), used as adjuvant, in an antigenic preparation tested in adult female outbred mice. This adjuvant was compared to the traditional adjuvant aluminum hydroxide. Materials and Methods The potential in generating humoral response was evaluated by enzyme-linked immunosorbent assay (ELISA). Individual serum was collected and immunoglobulin G (IgG), IgG1, IgG2a, and IgG2b were quantified. Analyses were carried out 15 and 60 days after immunization. Antibodies avidity index were also analyzed by ELISA. Immunoblot and dot-ELISA were carried out to evaluate specific reaction for homologous strains and cross-reactive antigens present in other meningococcal strains isolated in 2011–2012 year, in Brazil. Delayed type hypersensitivity was used as indicative of cellular immunity and compared between two experimental groups, 24 hours after homologous strain challenge. Results The OMVs of Neisseria meningitidis, and N. lactamica (related species) were characterized by electrophoretic separation of proteins in 13% polyacrylamide gel. The strains presented antigens in the range of 8 to 130 kDa, showing a heterogeneous protein migration pattern. In the group immunized with OMVs/DDA-BF, we found no significant production of total IgG 15 days after the first immunization. On the other hand, 60 days after first immunization both adjuvants act benefiting total IgG production similarly. The antibodies of the IgG isotype produced by animals immunized after one or two doses after first immunization, showed intermediate and high avidity, independent on the adjuvant used. In both experimental groups the swelling of the footpads was significantly higher than those of the controls, suggesting that only one dose was enough to stimulate the generation of cellular immunity. Conclusion The use of this cationic adjuvant for N. meningitidis OMVs preparation revealed good potential for future new antigen preparation for N. meningitidis vaccine.
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Cationic Nanoparticle-Based Cancer Vaccines. Pharmaceutics 2021; 13:pharmaceutics13050596. [PMID: 33919378 PMCID: PMC8143365 DOI: 10.3390/pharmaceutics13050596] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 04/14/2021] [Accepted: 04/17/2021] [Indexed: 12/15/2022] Open
Abstract
Cationic nanoparticles have been shown to be surprisingly effective as cancer vaccine vehicles in preclinical and clinical studies. Cationic nanoparticles deliver tumor-associated antigens to dendritic cells and induce immune activation, resulting in strong antigen-specific cellular immune responses, as shown for a wide variety of vaccine candidates. In this review, we discuss the relation between the cationic nature of nanoparticles and the efficacy of cancer immunotherapy. Multiple types of lipid- and polymer-based cationic nanoparticulate cancer vaccines with various antigen types (e.g., mRNA, DNA, peptides and proteins) and adjuvants are described. Furthermore, we focus on the types of cationic nanoparticles used for T-cell induction, especially in the context of therapeutic cancer vaccination. We discuss different cationic nanoparticulate vaccines, molecular mechanisms of adjuvanticity and biodistribution profiles upon administration via different routes. Finally, we discuss the perspectives of cationic nanoparticulate vaccines for improving immunotherapy of cancer.
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Brito LT, Rinaldi FM, Gaspar EB, Correa VA, Gonçalves CA, Portilho AI, Trzewikoswki de Lima G, De Gaspari E. Study of different routes of immunization using outer membrane vesicles of Neisseria meningitidis B and comparison of two adjuvants. Vaccine 2020; 38:7674-7682. [PMID: 33082014 DOI: 10.1016/j.vaccine.2020.09.081] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 09/10/2020] [Accepted: 09/28/2020] [Indexed: 12/16/2022]
Abstract
Outer membrane vesicles (OMVs) of Neisseria meningitidis contain important antigens to trigger an immune response against meningococci and have been studied as vaccines compounds. The immune response to a vaccine may be affected by its constitution and route of administration. Therefore, Swiss mice were immunized by different routes with OMVs of N. meningitidis B with dimethyl dioctadecyl ammonium bromide in bilayer fragments (DDA-BF) or aluminum hydroxide (AH) as adjuvants. The adjuvants and different routes were compared regarding the immune responses by ELISA, western blot, delayed type hypersensitivity (DTH) and histopathologic analysis. The antigenic preparation generated humoral and cellular immune responses. In quantitative analyzes, in general, AH was superior to DDA-BF. However, analysis such as IgG avidity index, bactericidal activity and immunoblot, revealed no important differences regarding the adjuvant or route of immunization. Regarding the parameters tested, it was not possible to define a superiority between the adjuvants and routes of immunization proposed by this study.
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Affiliation(s)
- Luciana T Brito
- Department of Immunology, Adolfo Lutz Institute, São Paulo, SP, Brazil; Post-Graduate Program Interunities in Biotechnology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Fabiana M Rinaldi
- Department of Immunology, Adolfo Lutz Institute, São Paulo, SP, Brazil; Post-Graduate Program Interunities in Biotechnology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | | | - Victor Araujo Correa
- Department of Immunology, Adolfo Lutz Institute, São Paulo, SP, Brazil; Post-Graduate Program Interunities in Biotechnology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | | | - Amanda Izeli Portilho
- Department of Immunology, Adolfo Lutz Institute, São Paulo, SP, Brazil; Post-Graduate Program Interunities in Biotechnology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Gabriela Trzewikoswki de Lima
- Department of Immunology, Adolfo Lutz Institute, São Paulo, SP, Brazil; Post-Graduate Program Interunities in Biotechnology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | - Elizabeth De Gaspari
- Department of Immunology, Adolfo Lutz Institute, São Paulo, SP, Brazil; Post-Graduate Program Interunities in Biotechnology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil.
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Carmona-Ribeiro AM, Pérez-Betancourt Y. Cationic Nanostructures for Vaccines Design. Biomimetics (Basel) 2020; 5:biomimetics5030032. [PMID: 32645946 PMCID: PMC7560170 DOI: 10.3390/biomimetics5030032] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 07/02/2020] [Accepted: 07/03/2020] [Indexed: 12/20/2022] Open
Abstract
Subunit vaccines rely on adjuvants carrying one or a few molecular antigens from the pathogen in order to guarantee an improved immune response. However, to be effective, the vaccine formulation usually consists of several components: an antigen carrier, the antigen, a stimulator of cellular immunity such as a Toll-like Receptors (TLRs) ligand, and a stimulator of humoral response such as an inflammasome activator. Most antigens are negatively charged and combine well with oppositely charged adjuvants. This explains the paramount importance of studying a variety of cationic supramolecular assemblies aiming at the optimal activity in vivo associated with adjuvant simplicity, positive charge, nanometric size, and colloidal stability. In this review, we discuss the use of several antigen/adjuvant cationic combinations. The discussion involves antigen assembled to 1) cationic lipids, 2) cationic polymers, 3) cationic lipid/polymer nanostructures, and 4) cationic polymer/biocompatible polymer nanostructures. Some of these cationic assemblies revealed good yet poorly explored perspectives as general adjuvants for vaccine design.
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Simple Nanoparticles from the Assembly of Cationic Polymer and Antigen as Immunoadjuvants. Vaccines (Basel) 2020; 8:vaccines8010105. [PMID: 32121174 PMCID: PMC7157673 DOI: 10.3390/vaccines8010105] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 02/19/2020] [Accepted: 02/24/2020] [Indexed: 01/05/2023] Open
Abstract
Since antigens are negatively charged, they combine well with positively charged adjuvants. Here, ovalbumin (OVA) (0.1 mg·mL-1) and poly (diallyldimethylammonium chloride) (PDDA) (0.01 mg·mL-1) yielded PDDA/OVA assemblies characterized by dynamic light scattering (DLS) and scanning electron microscopy (SEM) as spherical nanoparticles (NPs) of 170 ± 4 nm hydrodynamic diameter, 30 ± 2 mV of zeta-potential and 0.11 ± 0.01 of polydispersity. Mice immunization with the NPs elicited high OVA-specific IgG1 and low OVA-specific IgG2a production, indicating a Th-2 response. Delayed-type hypersensitivity reaction (DTH) was low and comparable to the one elicited by Al(OH)3/OVA, suggesting again a Th-2 response. PDDA advantages as an adjuvant were simplicity (a single-component adjuvant), low concentration needed (0.01 mg·mL-1 PDDA) combined with antigen yielding neglectable cytotoxicity, and high stability of PDDA/OVA dispersions. The NPs elicited much higher OVA-specific antibodies production than Al(OH)3/OVA. In vivo, the nano-metric size possibly assured antigen presentation by antigen-presenting cells (APC) at the lymph nodes, in contrast to the location of Al(OH)3/OVA microparticles at the site of injection for longer periods with stimulation of local dendritic cells. In the future, it will be interesting to evaluate combinations of the antigen with NPs carrying both PDDA and elicitors of the Th-1 response.
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Bacterial Outer Membrane Vesicles (OMVs)-based Dual Vaccine for Influenza A H1N1 Virus and MERS-CoV. Vaccines (Basel) 2019; 7:vaccines7020046. [PMID: 31141982 PMCID: PMC6631769 DOI: 10.3390/vaccines7020046] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Revised: 05/22/2019] [Accepted: 05/24/2019] [Indexed: 12/17/2022] Open
Abstract
Vaccination is the most functional medical intervention to prophylactically control severe diseases caused by human-to-human or animal-to-human transmissible viral pathogens. Annually, seasonal influenza epidemics attack human populations leading to 290–650 thousand deaths/year worldwide. Recently, a novel Middle East Respiratory Syndrome Coronavirus emerged. Together, those two viruses present a significant public health burden in areas where they circulate. Herein, we generated a bacterial outer membrane vesicles (OMVs)-based vaccine presenting the antigenic stable chimeric fusion protein of the H1-type haemagglutinin (HA) of the pandemic influenza A virus (H1N1) strain from 2009 (H1N1pdm09) and the receptor binding domain (RBD) of the Middle East Respiratory Syndrome Coronavirus (MERS-CoV) (OMVs-H1/RBD). Our results showed that the chimeric antigen could induce specific neutralizing antibodies against both strains leading to protection of immunized mice against H1N1pdm09 and efficient neutralization of MERS-CoV. This study demonstrate that OMVs-based vaccines presenting viral antigens provide a safe and reliable approach to protect against two different viral infections.
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Cai W, Kesavan DK, Wan J, Abdelaziz MH, Su Z, Xu H. Bacterial outer membrane vesicles, a potential vaccine candidate in interactions with host cells based. Diagn Pathol 2018; 13:95. [PMID: 30537996 PMCID: PMC6290530 DOI: 10.1186/s13000-018-0768-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Accepted: 11/07/2018] [Indexed: 02/07/2023] Open
Abstract
Both Gram-Positive and Gram-Negative bacteria can secrete outer membrane vesicles (OMVs) in their growth and metabolism process. Originally, OMVs were considered as a by-product of bacterial merisis. However, many scientists have reported the important role of OMVs in many fields recently. In this review, we briefly introduce OMVs biological functions and then summarize the findings about the OMVs interactions with host cells. At last, we will make an expectation about the prospects of the application of OMVs as vaccines.
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Affiliation(s)
- Wei Cai
- Department of Immunology, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | | | - Jie Wan
- Department of Immunology, Jiangsu University, Zhenjiang, 212013, Jiangsu, China
| | | | - Zhaoliang Su
- Department of Immunology, Jiangsu University, Zhenjiang, 212013, Jiangsu, China.,The Central Laboratory, the Fourth Affiliated of Jiangsu University, Zhenjiang, 212001, China
| | - Huaxi Xu
- Department of Immunology, Jiangsu University, Zhenjiang, 212013, Jiangsu, China.
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