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Nanoparticle-Based Vaccines Against Respiratory Viruses

Soultan Al-Halifa, Laurie Gauthier, Dominic Arpin and 2 more

Frontiers in Immunology · 2019 · Review · CC BY

doi:10.3389/fimmu.2019.00022

Abstract

The respiratory mucosa is the primary portal of entry for numerous viruses such as the respiratory syncytial virus, the influenza virus and the parainfluenza virus. These pathogens initially infect the upper respiratory tract and then reach the lower respiratory tract, leading to diseases. Vaccination is an affordable way to control the pathogenicity of viruses and constitutes the strategy of choice to fight against infections, including those leading to pulmonary diseases. Conventional vaccines based on live-attenuated pathogens present a risk of reversion to pathogenic virulence while inactivated pathogen vaccines often lead to a weak immune response. Subunit vaccines were developed to overcome these issues. However, these vaccines may suffer from a limited immunogenicity and, in most cases, the protection induced is only partial. A new generation of vaccines based on nanoparticles has shown great potential to address most of the limitations of conventional and subunit vaccines. This is due to recent advances in chemical and biological engineering, which allow the design of nanoparticles with a precise control over the size, shape, functionality and surface properties, leading to enhanced antigen presentation and strong immunogenicity. This short review provides an overview of the advantages associated with the use of nanoparticles as vaccine delivery platforms to immunize against respiratory viruses and highlights relevant examples demonstrating their potential as safe, effective and affordable vaccines.

Full text

From PubMed Central, U.S. National Library of Medicine, as current on Oct 20, 2026. Paragraph numbers are ours, so an answer can point at one.

Introduction

Lower respiratory tract infections (LRTIs) constitute a major public health burden worldwide. LRTIs represent a leading cause of human mortality and morbidity, causing annually over 3 million deaths worldwide. Among these infections, about 80% of LRTI cases are caused by viruses. In most cases, these pathogens enter the host via airborne transmissions (e.g., droplets or aerosols), replicate efficiently in the respiratory tract and cause clinical manifestations, ranging from fever to bronchiolitis and pneumonia. In addition, LRTIs associated with viruses represent an important source of economic loss for livestock and poultry industry as these infections predispose animals to secondary bacterial infections.

Viruses infecting the human lower respiratory tract include the influenza virus, the respiratory syncytial virus (RSV), the parainfluenza virus and the adenovirus. Seasonal influenza virus epidemics result in a significant burden of disease in children and elderlies and account for 3–5 million cases of severe illness and for nearly 290,000–650,000 deaths worldwide each year. RSV and parainfluenza virus infections are the leading cause of hospitalization for acute respiratory infections in young children, causing 45 and 40% of pediatric hospitalizations, respectively. Adenovirus infections account for 3–5% of LRTIs cases in children and can be fatal for immunocompromised patients. In general, respiratory viruses represent a major health problem in infants, young children, immunocompromised patients and the elderly population. According to Global Burden of Diseases (GBD), 74% of deaths associated with LRTIs represent these vulnerable patient groups.

Vaccination remains the most cost-effective strategy to fight against infectious diseases. Conventionally, vaccine formulations consist of attenuated viruses, killed pathogens (inactivated) or subunit protein antigens, which elicit a specific immune response. These vaccine formulations have allowed the prevention, or the control, of several important diseases including rubella, yellow fever, polio and measles, and, in the case of smallpox, even eradication. Considerable efforts have been devoted for the development of efficient vaccines against LRTIs, including inactivated/fragmented trivalent or quadrivalent seasonal vaccines against influenza type A and type B viruses such as Influvac®, Vaxigrip®, and Fluzone® as well as live attenuated vaccines such as Nasovac® and Flumist® for nasal administration in young children. Nevertheless, live-attenuated vaccines against influenza virus suffer from safety concerns due to their nature and represent a risk for elderly and immunosuppressed humans. Besides, killed pathogen vaccines and virus-derived subunit vaccines induce weaker immune responses and often require the use of an adjuvant to boost efficiency.

Several promising vaccines are currently evaluated in the clinics for different respiratory viruses. These new vaccine formulations aim to be safer and more efficient compared to traditional vaccines based on attenuated viruses, killed pathogens and subunits. Nevertheless, the high level of antigenic drift (genetic mutations) of some viruses, such as the influenza virus, reduces the efficacy of vaccines and needs to be addressed. Therefore, while improving safety and efficiency, vaccines should also be less sensitive to antigenic drift. The concept of “universal vaccine” is critical for viruses like the influenza virus, and new formulations to induce broad-spectrum immunity are being investigated. In the next sections, we discuss the advantages of using nanoparticle formulations against respiratory viruses and we highlight relevant examples of the use of nanoparticles as safe, effective, and affordable vaccines.

Nanoparticles, an Alternative Approach to Conventional Vaccines

The use of particles as nanoplatforms displaying relevant antigenic moieties is appealing as an alternative approach to conventional vaccines. These nano-sized materials can be obtained from biological sources and/or can be synthetic. Currently, there is a large variety of particles evaluated as antigen carriers, including inorganic and polymeric nanoparticles, virus-like particles (VLPs), liposomes and self-assembled protein nanoparticles (Figure 1A). The advantages of these materials reside primarily in their size (at least one dimension should be at the nanometer level), since many biological systems such as viruses and proteins are nano-sized. Nanoparticles can be administered via sub-cutaneous and intramuscular injections, or can be delivered through the mucosal sites (oral and intranasal), and penetrate capillaries as well as mucosal surfaces. Recent progresses have allowed the preparation of nanoparticles with unique physicochemical properties. For instance, size, shape, solubility, surface chemistry, and hydrophilicity can be tuned and controlled, which allows the preparation of nanoparticles with tailored biological properties. Moreover, nanoparticles can be designed to allow the incorporation of a wide range of molecules including antigens which makes them highly interesting in vaccinology.

Incorporation of antigens in nanoparticles can be achieved by encapsulation (physical entrapment) or by conjugation (covalent functionalization). Studies have demonstrated that nanoparticles could protect the native structure of antigens from proteolytic degradation and/or improve antigen delivery to antigen-presenting cells (APCs). In addition, nanoparticles incorporating antigens can exert a local depot effect, ensuring prolonged antigen presentation to immune cells. Interestingly, nanoparticles have also shown intrinsic immunomodulatory activity. For instance, nanoparticles such as carbon nanotubes (CNTs), carbon black nanoparticles, poly(lactic-co-glycolic acid) (PLGA) and polystyrene nanoparticles, titanium dioxide (TiO2) nanoparticles, silicon dioxide (SiO2) nanoparticles, and aluminum oxyhydroxide nanoparticles have been reported to induce NLRP3-associated inflammasome activation. In fact, once internalized by APCs, these nanoparticles provide signals that trigger lysosomal destabilization and the production of reactive oxygen species (ROS), leading to the release of lysosomal contents, including the cysteine protease cathepsin B. This protease is sensed by NLRP3, which subsequently activates the formation of the inflammasome complex. Subsequently, interleukins are produced as downstream signaling events, leading to the recruitment and/or activation of immune cells. Taken together, these properties advocate that nanoparticles are promising antigen carriers and immune cell activators for vaccination.

Nanoparticles and the Respiratory Tract Immune System

The respiratory mucosa represents the primary site for invasion and infection by a virus whose replication occurs in the ciliated cells of the upper respiratory tract (URT). Subsequently, infection spreads to the low respiratory tract (LRT) by virus-rich secretions and by infected cell debris from the URT. Nasal-associated lymphoid tissue (NALT), the first site for inhaled antigen recognition located in the URT, is an important line of defense against respiratory viruses. NALT is present in rodents, birds and primates. This structure is characterized by aggregates of lymphoid cells located in the nasopharyngeal cavity. In human, the Waldever's ring, made of adenoid and tonsil, is considered as the equivalent of NALT structure, which contains various narrow epithelial channels. NALT comprises aggregates of lymphoid follicles (B-cell areas), interfollicular areas (T-cell areas), macrophages and dendritic cells (DCs) (Figure 1B), which, when activated, support the clearance of infectious agents. Accordingly, NALT is considered as an inductive site for humoral and cellular immune responses and represents a promising target for vaccines against respiratory viruses. Ideally, nanovaccines would follow a path similar to respiratory viruses in order to efficiently deliver antigens to NALT and trigger a specific mucosal immune response. Therefore, formulation, size and antigen exposition are critical aspects when designing nanovaccines targeting NALT. Most respiratory viruses have an average diameter size ranging between 20 and 200 nm. Thus, in addition of being safe and immunogenic on its own, a nanovaccine should have a size similar to viruses while incorporating relevant antigens.

Over the last decade, a number of nanoparticles have been designed to mimic respiratory viruses in terms of size, shape and surface property in order to target NALT as well as to raise humoral and cellular immune responses. First, beside a nanoparticle size of 20–200 nm in diameter to match the size of most respiratory viruses, nanoparticles should be preferably positively charged. In fact, positively charged polymeric, phospholipidic, metallic, inorganic, and protein-based nanoparticles have shown stronger immune responses compared to their negatively charged counterparts. Second, the incorporation of antigens/epitopes within or on the surface of the nanoparticles can be challenging and requires advanced approaches in chemical and/or biological engineering. The most common strategy is to encapsulate or entrap antigens/epitopes within the nanoparticles. In this case, nanoparticles are used to protect the antigen/epitopes and deliver them to NALT. Nanoencapsulation can be achieved by using different procedures, including nanoprecipitation and oil in water (o/w) emulsion. Alternatively, antigens can be attached and exposed on the nanoparticle surface. This strategy aims at mimicking viruses. Conjugation of antigenic epitope can be performed directly on the nanoparticles using different chemical reactions like the disulfide bond and the thiolate-gold bond formation. Otherwise, it can be achieved by first preparing an epitope-functionalized self-assembling unit, which upon self-assembly form nanoparticles decorated with the antigen. Third, the formulation and administration strategies are also critical aspects to consider. Vaccines administered via subcutaneous or intramuscular injection induce systemic immunity and usually, a weak mucosal response is observed. On the other hand, mucosal vaccination, either oral or intranasal delivery, induces humoral, and cellular immune responses at the systemic level and the mucosal surfaces, which is more effective in the protection against respiratory viruses. Studies have demonstrated that vaccination via the intranasal route provides a better protection when compared to subcutaneous immunization in the context of respiratory pathogens and mucosal immunity. Intranasal vaccination led to higher antigen-specific lymphocyte proliferation, cytokine production (interferon-γ, interleukins) and induction of antigen-specific IgA antibody. A promising formulation strategy is the intranasal spray, which delivers conveniently and safely the nanovaccines directly to the respiratory mucosa. However, the number of clinical trials using nanovaccine formulations for intranasal delivery, including spray dried nanovaccines, is limited. This is mostly associated with the difficulty of keeping the nanovaccine integrity during the entire formulation process. Moreover, the immune response is particularly sensitive to the nature, size, shape, and surface properties of the nanoparticles as well as to the density and the potency of the antigens. Thus, it is very challenging to predict the effect of a given nanovaccine on the immune system. In addition, nanoparticles have some limitations associated with their synthesis, or preparation, and their properties. These include limited antigen loading, low synthesis yield, poor targeting capability to immune cells, limited manufacturability, and, in some cases, toxicity. These drawbacks can lead to side effects and/or poor immunogenicity, which precludes their clinical usage. Besides, little is known about the interactions between nanoparticles and immune cells. In fact, their adjuvant effect and their ability to activate the immune system still remain unclear and need to be better understood at the molecular level. Nonetheless, nanoparticle formulations have recently revealed promising results against respiratory virus infections (Table 1) and relevant examples will now be discussed.

Polymeric Nanoparticles

A polymer consists of a large molecule constructed from monomeric units. Depending on the construction, polymers can be linear, slightly branched or hyperbranched (3D network). Polymeric nanoparticles can be either obtained from the polymerization of monomeric units or from preformed polymers. These nanoparticles are attractive in the medical field due to their adjustable properties (size, composition, and surface properties), which allow controlled release, ability to combine both therapy and imaging (theranostics), and protection of drug molecules. For example, poly(lactic-co-glycolic acid) (PLGA) is a biodegradable and biocompatible polymer approved by the Food and Drug Administration (FDA) and European Medicines Agency (EMA) for use in humans. This is due to its ability to undergo hydrolysis in vivo, resulting in lactic acid and glycolic acid metabolites, which are efficiently processed by the body. PLGA can be engineered to form nanoparticles capable of encapsulating different types of biomolecules and release them sustainably over time. These nanoparticles can encapsulate antigens and prevent their degradation over 4 weeks under physiological conditions, which is critical for mucosal vaccination. Moreover, PLGA-NPs promote antigen internalization by APCs and facilitate antigen processing and presentation to naïve lymphocytes. For instance, spherical PLGA-NPs (200–300 nm of diameter) were used to encapsulate an inactivated Swine influenza virus (SwIV) H1N2 antigens (KAg) via water/oil/water double emulsion solvent evaporation. It was observed that pigs vaccinated twice with this preparation and challenged with a virulent heterologous influenza virus strain, have a significantly milder disease in comparison to non-vaccinated animals. This observation correlated closely with the reduced lung pathology and the substantial clearance of the virus from the animal lungs. Other polymeric nanoparticles, such as chitosan, a natural polymer composed of randomly distributed β--linked d-glucosamine and N-acetyl-d-glucosamine, and N-(2-hydroxypropyl)methacrylamide/N-isopropylacrylamide (HPMA/NIPAM), were also investigated as intranasal vaccines against respiratory viruses. Overall, polymeric nanoparticles have many advantages, including biocompatibility, antigen encapsulation and stabilization, controlled release of antigens and intracellular persistence in APCs, pathogen-like characteristics, and suitability for intranasal administration. Nevertheless, the effect of the polymer properties (core chemistry, size, shape, surface properties) on the transport within the URT remains unknown. More studies are needed to better understand the effect of changing nanoparticle properties on their biological activities and to, ultimately, predict the fate of these nanocarriers upon their intranasal administration.

Self-Assembling Protein Nanoparticles and VLPs

Self-assembling protein nanoparticles (SAPNs) are structures obtained from the oligomerization of monomeric proteins. The protein building blocks are mostly obtained through recombinant technologies and are considered safe for biomedical applications. SAPNs can be engineered to have a diameter ranging from 20 to 100 nm, similar to the sizes of many viruses and therefore, are considered as nanovaccine candidates against viruses, including respiratory viruses. For example, SANPs, designed to elicit an immune response against RSV, have been explored using the nucleoprotein (N) from the virus nucleocapsid. The N protein is a major target of antigen-specific cytotoxic T-cell response. The self-assembly of N protein protomers led to the formation of supramolecular nanorings of 15 nm diameter. This platform was modified by fusing the FsII epitope targeted by monoclonal neutralizing antibody (palivizumab) to the N-protein, in order to form chimeric nanorings with enhanced immune response and virus protection against RSV. The results showed reduced virus load in the lungs of challenged mice. Similarly, chimeric nanorings displaying 3 repeats of the highly conserved ectodomain of the influenza virus A matrix protein 2 (M2e), were prepared by recombinant technologies. When administrated via the intranasal route, these M2e-functionalized nanorings induced local production of mucosal antibodies and led to mice protection. These N-nanorings are interesting for intranasal delivery of antigen due to their similarities with respiratory viruses in term of size and structure (sub-nucleocapsid-like superstructures). Other examples of SAPNs as potential nanovaccines against respiratory viruses include the capsid protein of the papaya mosaic virus (PapMV), the purified coronavirus spike protein and ferritin, which are self-assembling proteins that form rod-shaped and nearly spherical nanostructures, respectively. Recently, assemblies composed of four tandem copies of M2e and headless HA proteins were prepared and stabilized by sulfosuccinimidyl propionate crosslinking, showing the possibility of generating protein nanoparticles almost entirely composed of the antigens of interest.

VLPs are spherical supramolecular assemblies of 20–200 nm diameter, which result from the self-assembly of viral capsid proteins. These particles are free from genetic materials and have the advantage of mimicking perfectly the structure and the antigenic epitopes of their corresponding native viruses. Therefore, this repetitive antigen display promotes efficient phagocytosis by APCs and subsequent activation. Recently, Lee and colleagues demonstrated that intranasal delivery of influenza-derived VLPs expressed in insect cells and exposing 5 repeats of the M2e epitopes, confers cross protection against different serotypes of influenza viruses by inducing humoral and cellular immune responses.

SAPNs and VLPs are thus attractive but their formulation into stable and spray dried vaccines for intranasal injection can be challenging and may require the use of surfactants and saccharides. In the last decades, self-assembling peptides (SAPs) have also been investigated as intranasal nanovaccines against respiratory viruses due to their straightforward chemical synthesis and their storage stability upon lyophilization.

Inorganic Nanoparticles

There are many inorganic nanoparticles suitable for biomedical applications, including superparamagnetic nanoparticles (iron oxide nanoparticles), quantum dots and plasmonic nanoparticles (gold and silver nanoparticles). Inorganic materials are mostly used as tools with improved therapeutic efficacy, biodistribution and pharmacokinetics. However, inherently, plain inorganic core nanoparticles would not be suitable in biological fluids due to particle aggregation. Therefore, in the medical field, these nanoparticles are often coated with organic molecules via adsorption or chemical reactions. In fact, these biocompatible nanoparticles can be described as complex hybrids materials with an inorganic core and an organic outer shell. Among inorganic nanoparticles, the most commonly used for vaccination are gold nanoparticles (AuNPs). AuNPs are readily internalized by macrophages and dendritic cells, and induce their activation. Large scale production is possible with strict control on particle size and ease of functionalization using the strong affinity between thiol groups and gold. Thiol groups can be attached to AuNP surface by forming thiolate–Au bonds. Furthermore, no immune response is elicited toward inert carriers like AuNPs. Thus, these nanoparticles are an appealing platform for nanovaccine engineering via antigen functionalization.

A wide range of molecules, including adjuvants and antigens can be conjugated on AuNPs at high density, resulting in improved immunogenicity and antigen presentation. AuNPs can be formulated for intranasal administration and can diffuse into the lymph nodes, triggering robust antigen-specific cytotoxic T-cell immune responses. Tao and coworkers have demonstrated that the peptide consensus M2e of influenza A viruses with a non-native cysteine residue at the C-terminal end could be attached on the AuNPs via thiolate–Au chemistry. The resulting M2e-AuNPs was administered by the intranasal route to mice with CpG (cytosine-guanine rich oligonucleotide) adjuvant, triggering a fully protective immune response against the influenza virus PR8 strain. More recently, it was demonstrated that this formulation could induce lung B cell activation and robust serum anti-M2e IgG response, with stimulation of both IgG1 and IgG2a subclasses. Additionally, this vaccination strategy led to protection against infection by the pandemic influenza virus strain, A/California/04/2009 (H1N1pdm) pandemic strain, influenza virus A/Victoria/3/75 (H3N2) strain and the highly pathogenic avian influenza virus A/Vietnam/1203/2004 (H5N1). Although gold nanoparticles constitute an attractive platform for antigen conjugation, they can accumulate in organs such as liver and spleen for a long period, which could be ultimately associated with toxicity. Coating with biocompatible materials reduces their toxicity, although it can lead to alterations of the physicochemical and biological properties. Therefore, safety issues of AuNPs still need to be addressed.

Conclusion and Perspectives

Engineered nanoparticles have demonstrated their potential as vaccine delivery platforms. They can be envisaged as both antigen nanocarriers and adjuvants. In all cases, intranasal administration of nanovaccines allows a convenient and safe delivery of the antigen to NALT, inducing mucosal and systemic immunity. Nonetheless, additional studies are still needed before their clinical translation. While intranasal vaccination of nanoparticles generates specific IgA antibody in the URT and leads to high survival rates in animal models, there are still limited studies on non-human primates, thus making nanoparticle's fate difficult to predict in a human URT. In addition, nanoparticle vaccines are generally functionalized with specific antigen(s), which result in an immune response targeted against these antigenic determinants. Considering antigenic drifts, the growing human population that needs to be vaccinated and the different type of viruses, the cost to address all these aspects would be too prohibitive to produce affordable vaccines. Consequently, the development of broad spectrum vaccines constitutes a critical need and we consider that nanovaccine engineering will contribute to achieve this objective.

Author Contributions

SA-H, LG, DoA, SB, and DeA have participated in writing and preparation of the manuscript, and approved it for publication.

Conflict of Interest Statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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    Marasini N Skwarczynski M Toth I. Intranasal delivery of nanoparticle-based vaccines. Ther Deliv. (2017 ) 8:151–67.

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    Zuercher AW Coffin SE Thurnheer MC Fundova P Cebra JJ. Nasal-associated lymphoid tissue is a mucosal inductive site for virus-specific humoral and cellular immune responses. J Immunol. (2002 ) 168:1796.

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    Lamb RA Choppin PW. The gene structure and replication of influenza virus. Annu Rev Biochem. (1983 ) 52:467–506.

    Not in our library10.1146/annurev.bi.52.070183.002343

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    Henrickson KJ. Parainfluenza viruses. Clin Microbiol Rev. (2003 ) 16:242–64.

    Not in our library10.1128/cmr.16.2.242-264.2003

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    Utley TJ Ducharme NA Varthakavi V Shepherd BE Santangelo PJ Lindquist ME. Respiratory syncytial virus uses a Vps4-independent budding mechanism controlled by Rab11-FIP2. Proc Natl Acad Sci USA. (2008 ) 105:10209–14.

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    Hall K Blair Zajdel ME Blair GE. Unity and diversity in the human adenoviruses: exploiting alternative entry pathways for gene therapy. Biochem J. (2010 ) 431:321–36.

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    Gomes AC Mohsen M Bachmann MF. Harnessing nanoparticles for immunomodulation and vaccines. Vaccines (2017 ) 5:E6.

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    Niu Y Yu M Hartono SB Yang J Xu H Zhang H. Nanoparticles mimicking viral surface topography for enhanced cellular delivery. Adv Mater. (2013 ) 25:6233–7.

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    Fogarty JA Swartz JR The exciting potential of modular nanoparticles for rapid development of highly effective vaccines. Curr Opin Chem Eng. (2018 ) 19:1–8.

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    Fromen CA Robbins GR Shen TW Kai MP Ting JP Desimone JM. Controlled analysis of nanoparticle charge on mucosal and systemic antibody responses following pulmonary immunization. Proc Natl Acad Sci USA. (2015 ) 112:488–93.

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    Rahimian S Kleinovink JW Fransen MF Mezzanotte L Gold H Wisse P. Near-infrared labeled, ovalbumin loaded polymeric nanoparticles based on a hydrophilic polyester as model vaccine: In vivo tracking and evaluation of antigen-specific CD8(+) T cell immune response. Biomaterials (2015 ) 37:469–77.

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  59. 59.

    Kasturi SP Kozlowski PA Nakaya HI Burger MC Russo P Pham M. Adjuvanting a simian immunodeficiency virus vaccine with toll-like receptor ligands encapsulated in nanoparticles induces persistent antibody responses and enhanced protection in TRIM5alpha restrictive macaques. J Virol. (2017 ) 91:e01844–16.

    Not in our library10.1128/jvi.01844-16

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    Nanoparticles for the Induction of Antigen-Specific Immunological Tolerance · 2018
    No notice
  61. 61.

    Kumari A Singla R Guliani A Yadav SK. Nanoencapsulation for drug delivery. EXCLI J. (2014 ) 13:265–86.

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    Hirosue S Kourtis IC Van Der Vlies AJ Hubbell JA Swartz MA. Antigen delivery to dendritic cells by poly(propylene sulfide) nanoparticles with disulfide conjugated peptides: Cross-presentation and T cell activation. Vaccine (2010 ) 28:7897–906.

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    Ding P Zhang T Li Y Teng M Sun Y Liu X. Nanoparticle orientationally displayed antigen epitopes improve neutralizing antibody level in a model of porcine circovirus type 2. Int J Nanomed. (2017 ) 12:5239–54.

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    Tao W Hurst BL Shakya AK Uddin MJ Ingrole RS Hernandez-Sanabria M. Consensus M2e peptide conjugated to gold nanoparticles confers protection against H1N1, H3N2 and H5N1 influenza A viruses. Antiviral Res. (2017 ) 141:62–72.

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    Mora-Solano C Wen Y Han H Chen J Chong AS Miller ML. Active immunotherapy for TNF-mediated inflammation using self-assembled peptide nanofibers. Biomaterials (2017 ) 149:1–11.

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    Negahdaripour M Golkar N Hajighahramani N Kianpour S Nezafat N Ghasemi Y. Harnessing self-assembled peptide nanoparticles in epitope vaccine design. Biotechnol Adv. (2017 ) 35:575–96.

    Not in our library10.1016/j.biotechadv.2017.05.002

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    Babych M Bertheau-Mailhot G Zottig X Dion J Gauthier L Archambault D. Engineering and evaluation of amyloid assemblies as a nanovaccine against the Chikungunya virus. Nanoscale (2018 ) 10:19547–56.

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    Ichinohe T Ainai A Tashiro M Sata T Hasegawa H. PolyI:polyC12U adjuvant-combined intranasal vaccine protects mice against highly pathogenic H5N1 influenza virus variants. Vaccine (2009 ) 27:6276–9.

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    Lycke N. Recent progress in mucosal vaccine development: potential and limitations. Nat Rev Immunol. (2012 ) 12:592–605.

    Not in our library10.1038/nri3251

  70. 70.

    Chen L Wang J Zganiacz A Xing Z. Single intranasal mucosal Mycobacterium bovis BCG vaccination confers improved protection compared to subcutaneous vaccination against pulmonary tuberculosis. Infect Immun. (2004 ) 72:238–46.

    Not in our library10.1128/iai.72.1.238-246.2004

  71. 71.

    Giri PK Sable SB Verma I Khuller GK. Comparative evaluation of intranasal and subcutaneous route of immunization for development of mucosal vaccine against experimental tuberculosis. FEMS Immunol Med Microbiol. (2005 ) 45:87–93.

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    Mapletoft JW Latimer L Babiuk LA Van Drunen Littel-Van Den Hurk S. Intranasal immunization of mice with a bovine respiratory syncytial virus vaccine induces superior immunity and protection compared to those by subcutaneous delivery or combinations of intranasal and subcutaneous prime-boost strategies. Clin Vaccine Immunol. (2010 ) 17:23.

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    Kharb S Charan S. Mucosal immunization provides better protection than subcutaneous immunization against Pasteurella multocida (B:2) in mice preimmunized with the outer membrane proteins. Vet Res Commun. (2011 ) 35:457–61.

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    Mccormick AA Shakeel A Yi C Kaur H Mansour AM Bakshi CS. Intranasal administration of a two-dose adjuvanted multi-antigen TMV-subunit conjugate vaccine fully protects mice against Francisella tularensis LVS challenge. PLoS ONE (2018 ) 13:e0194614.

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  75. 75.

    Birkhoff M Leitz M Marx D Advantages of intranasal vaccination and considerations on device selection. Indian J Pharmaceut Sci. (2009 ) 71:729–31.

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    Kanojia G Have RT Soema PC Frijlink H Amorij JP Kersten G. Developments in the formulation and delivery of spray dried vaccines. Hum Vaccin Immunother. (2017 ) 13:2364–78.

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    Kim SH Jang YS. The development of mucosal vaccines for both mucosal and systemic immune induction and the roles played by adjuvants. Clin Exp Vaccine Res. (2017 ) 6:15–21.

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    Shao K Singha S Clemente-Casares X Tsai S Yang Y Santamaria P. Nanoparticle-based immunotherapy for cancer. ACS Nano. (2015 ) 9:16–30.

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    Zilker C Kozlova D Sokolova V Yan H Epple M Überla K. Nanoparticle-based B-cell targeting vaccines: tailoring of humoral immune responses by functionalization with different TLR-ligands. Nanomedicine (2017 ) 13:173–82.

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    Pan J Wang Y Zhang C Wang X Wang H Wang J. Antigen-directed fabrication of a multifunctional nanovaccine with ultrahigh antigen loading efficiency for tumor photothermal-immunotherapy. Adv Mater. (2018 ) 30:1704408.

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    Sahdev P Ochyl LJ Moon JJ. Biomaterials for nanoparticle vaccine delivery systems. Pharmaceut Res. (2014 ) 31:2563–82.

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  82. 82.

    Mansoor F Earley B Cassidy JP Markey B Doherty S Welsh MD. Comparing the immune response to a novel intranasal nanoparticle PLGA vaccine and a commercial BPI3V vaccine in dairy calves. BMC Vet Res. (2015 ) 11:220.

    Not in our library10.1186/s12917-015-0481-y

  83. 83.

    Dhakal S Hiremath J Bondra K Lakshmanappa YS Shyu DL Ouyang K. Biodegradable nanoparticle delivery of inactivated swine influenza virus vaccine provides heterologous cell-mediated immune response in pigs. J Control Release (2017 ) 247:194–205.

    Not in our library10.1016/j.jconrel.2016.12.039

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    Okamoto S Matsuura M Akagi T Akashi M Tanimoto T Ishikawa T. Poly(gamma-glutamic acid) nano-particles combined with mucosal influenza virus hemagglutinin vaccine protects against influenza virus infection in mice. Vaccine (2009 ) 27:5896–905.

    Not in our library10.1016/j.vaccine.2009.07.037

  85. 85.

    Liu Q Zheng X Zhang C Shao X Zhang X Zhang Q. Conjugating influenza a (H1N1) antigen to n-trimethylaminoethylmethacrylate chitosan nanoparticles improves the immunogenicity of the antigen after nasal administration. J Med Virol. (2015 ) 87:1807–15.

    Not in our library10.1002/jmv.24253

  86. 86.

    Sawaengsak C Mori Y Yamanishi K Mitrevej A Sinchaipanid N. Chitosan nanoparticle encapsulated hemagglutinin-split influenza virus mucosal vaccine. AAPS PharmSciTech. (2014 ) 15:317–25.

    Not in our library10.1208/s12249-013-0058-7

  87. 87.
    Mucosal Immunity and Protective Efficacy of Intranasal Inactivated Influenza Vaccine Is Improved by Chitosan Nanoparticle Delivery in Pigs · 2018
    No notice
  88. 88.

    Dabaghian M Latifi AM Tebianian M Najminejad H Ebrahimi SM. Nasal vaccination with r4M2e.HSP70c antigen encapsulated into N-trimethyl chitosan (TMC) nanoparticulate systems: preparation and immunogenicity in a mouse model. Vaccine (2018 ) 36:2886–95.

    Not in our library10.1016/j.vaccine.2018.02.072

  89. 89.

    Lynn GM Laga R Darrah PA Ishizuka AS Balaci AJ Dulcey AE. In vivo characterization of the physicochemical properties of polymer-linked TLR agonists that enhance vaccine immunogenicity. Nat Biotechnol. (2015 ) 33:1201.

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    Francica JR Lynn GM Laga R Joyce MG Ruckwardt TJ Morabito KM. Thermoresponsive polymer nanoparticles Co-deliver RSV F Trimers with a TLR-7/8 Adjuvant. Bioconjug Chem. (2016 ) 27:2372–85.

    Not in our library10.1021/acs.bioconjchem.6b00370

  91. 91.

    Ulery BD Phanse Y Sinha A Wannemuehler MJ Narasimhan B Bellaire BH. Polymer chemistry influences monocytic uptake of polyanhydride nanospheres. Pharm Res. (2009 ) 26:683–90.

    Not in our library10.1007/s11095-008-9760-7

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    Mcgill JL Kelly SM Kumar P Speckhart S Haughney SL Henningson J. Efficacy of mucosal polyanhydride nanovaccine against respiratory syncytial virus infection in the neonatal calf. Sci Rep. (2018 ) 8:3021.

    Not in our library10.1038/s41598-018-21292-2

  93. 93.

    Roux X Dubuquoy C Durand G Tran-Tolla TL Castagne N Bernard J. Sub-nucleocapsid nanoparticles: a nasal vaccine against respiratory syncytial virus. PLoS ONE (2008 ) 3:e1766.

    Not in our library10.1371/journal.pone.0001766

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    Herve PL Deloizy C Descamps D Rameix-Welti MA Fix J Mclellan JS. RSV N-nanorings fused to palivizumab-targeted neutralizing epitope as a nanoparticle RSV vaccine. Nanomedicine (2017 ) 13:411–20.

    Not in our library10.1016/j.nano.2016.08.006

  95. 95.

    Herve PL Raliou M Bourdieu C Dubuquoy C Petit-Camurdan A Bertho N. A novel subnucleocapsid nanoplatform for mucosal vaccination against influenza virus that targets the ectodomain of matrix protein 2. J Virol. (2014 ) 88:325–38.

    Not in our library10.1128/jvi.01141-13

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    Qi M Zhang XE Sun X Zhang X Yao Y Liu S. Intranasal nanovaccine confers homo- and hetero-subtypic influenza protection. Small (2018 ) 14:e1703207.

    Not in our library10.1002/smll.201703207

  97. 97.

    Si Y Wen Y Kelly SH Chong AS Collier JH. Intranasal delivery of adjuvant-free peptide nanofibers elicits resident CD8(+) T cell responses. J Control Release (2018 ) 282:120–30.

    Not in our library10.1016/j.jconrel.2018.04.031

  98. 98.

    Quan FS Huang C Compans RW Kang SM. Virus-like particle vaccine induces protective immunity against homologous and heterologous strains of influenza virus. J Virol. (2007 ) 81:3514–24.

    Not in our library10.1128/jvi.02052-06

  99. 99.

    Lee YT Ko EJ Lee Y Kim KH Kim MC Lee YN. Intranasal vaccination with M2e5x virus-like particles induces humoral and cellular immune responses conferring cross-protection against heterosubtypic influenza viruses. PLoS ONE (2018 ) 13:e0190868.

    Not in our library10.1371/journal.pone.0190868

  100. 100.

    Cai M Wang C Li Y Gu H Sun S Duan Y. Virus-like particle vaccine by intranasal vaccination elicits protective immunity against respiratory syncytial viral infection in mice. Acta Biochim Biophys Sin. (2017 ) 49:74–82.

    Not in our library10.1093/abbs/gmw118

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    Wee JL Scheerlinck JP Snibson KJ Edwards S Pearse M Quinn C. Pulmonary delivery of ISCOMATRIX influenza vaccine induces both systemic and mucosal immunity with antigen dose sparing. Mucosal Immunol. (2008 ) 1:489–96.

    Not in our library10.1038/mi.2008.59

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    Coulter A Harris R Davis R Drane D Cox J Ryan D Intranasal vaccination with ISCOMATRIX® adjuvanted influenza vaccine. Vaccine (2003 ) 21:946–9.

    Not in our library10.1016/s0264-410x(02)00545-5

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    Tai W Roberts L Seryshev A Gubatan JM Bland CS Zabriskie R. Multistrain influenza protection induced by a nanoparticulate mucosal immunotherapeutic. Mucosal Immunol. (2011 ) 4:197–207.

    Not in our library10.1038/mi.2010.50

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    Piluso S Soultan AH Patterson J. Molecularly engineered polymer-based systems in drug delivery and regenerative medicine. Curr Pharm Des. (2017 ) 23:281–94.

    Not in our library10.2174/1381612822666161021104239

  105. 105.

    Kamaly N Xiao Z Valencia PM Radovic-Moreno AF Farokhzad OC. Targeted polymeric therapeutic nanoparticles: design, development and clinical translation. Chem Soc Rev. (2012 ) 41:2971–3010.

    Not in our library10.1039/c2cs15344k

  106. 106.

    Krasia-Christoforou T Georgiou TK Polymeric theranostics: using polymer-based systems for simultaneous imaging and therapy. J Mater Chem B (2013 ) 1:3002

    Not in our library10.1039/c3tb20191k

  107. 107.

    Tang Z He C Tian H Ding J Hsiao BS Chu B Polymeric nanostructured materials for biomedical applications. Progress Polymer Sci. (2016 ) 60:86–128.

    Not in our library10.1016/j.progpolymsci.2016.05.005

  108. 108.

    Acharya S Sahoo SK. PLGA nanoparticles containing various anticancer agents and tumour delivery by EPR effect. Adv Drug Deliv Rev. (2011 ) 63:170–83.

    Not in our library10.1016/j.addr.2010.10.008

  109. 109.
    Biodegradable nanoparticles are excellent vehicle for site directed in-vivo delivery of drugs and vaccines · 2011
    No notice
  110. 110.

    Danhier F Ansorena E Silva JM Coco R Le Breton A Preat V. PLGA-based nanoparticles: an overview of biomedical applications. J Control Release (2012 ) 161:505–22.

    Not in our library10.1016/j.jconrel.2012.01.043

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    PLGA particulate delivery systems for subunit vaccines: Linking particle properties to immunogenicity · 2016
    No notice
  112. 112.

    Getts DR Shea LD Miller SD King NJ. Harnessing nanoparticles for immune modulation. Trends Immunol. (2015 ) 36:419–27.

    Not in our library10.1016/j.it.2015.05.007

  113. 113.

    Woodrow KA Bennett KM Lo DD. Mucosal vaccine design and delivery. Annu Rev Biomed Eng. (2012 ) 14:17–46.

    Not in our library10.1146/annurev-bioeng-071811-150054

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    Santos DM Carneiro MW De Moura TR Soto M Luz NF Prates DB. PLGA nanoparticles loaded with KMP-11 stimulate innate immunity and induce the killing of Leishmania. Nanomedicine (2013 ) 9:985–95.

    Not in our library10.1016/j.nano.2013.04.003

  115. 115.

    Csaba N Garcia-Fuentes M Alonso MJ. Nanoparticles for nasal vaccination. Adv Drug Deliv Rev. (2009 ) 61:140–57.

    Not in our library10.1016/j.addr.2008.09.005

  116. 116.

    Li P Tan H Xu D Yin F Cheng Y Zhang X. Effect and mechanisms of curdlan sulfate on inhibiting HBV infection and acting as an HB vaccine adjuvant. Carbohydr Polym. (2014 ) 110:446–55.

    Not in our library10.1016/j.carbpol.2014.04.025

  117. 117.

    Li P Zhang X Cheng Y Li J Xiao Y Zhang Q. Preparation and in vitro immunomodulatory effect of curdlan sulfate. Carbohydr Polym. (2014 ) 102:852–61.

    Not in our library10.1016/j.carbpol.2013.10.078

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    Islam S Bhuiyan MAR Islam MN Chitin and chitosan: structure, properties and applications in biomedical engineering. J Polym Environ. (2016 ) 25:854–66.

    Not in our library10.1007/s10924-016-0865-5

  119. 119.

    Marasini N Giddam AK Khalil ZG Hussein WM Capon RJ Batzloff MR. Double adjuvanting strategy for peptide-based vaccines: trimethyl chitosan nanoparticles for lipopeptide delivery. Nanomedicine (2016 ) 11:3223–35.

    Not in our library10.2217/nnm-2016-0291

  120. 120.
    Intranasal Vaccination with Mannosylated Chitosan Formulated DNA Vaccine Enables Robust IgA and Cellular Response Induction in the Lungs of Mice and Improves Protection against Pulmonary Mycobacterial Challenge · 2017
    Not checked
  121. 121.

    Zhang S Huang S Lu L Song X Li P Wang F. Curdlan sulfate-O-linked quaternized chitosan nanoparticles: potential adjuvants to improve the immunogenicity of exogenous antigens via intranasal vaccination. Int J Nanomed. (2018 ) 13:2377–94.

    Not in our library10.2147/ijn.s158536

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    Vela-Ramirez JE Goodman JT Boggiatto PM Roychoudhury R Pohl NL Hostetter JM. Safety and biocompatibility of carbohydrate-functionalized polyanhydride nanoparticles. AAPS J. (2015 ) 17:256–67.

    Not in our library10.1208/s12248-014-9699-z

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    Carrillo-Conde B Schiltz E Yu J Chris Minion F Phillips GJ Wannemuehler MJ. Encapsulation into amphiphilic polyanhydride microparticles stabilizes Yersinia pestis antigens. Acta Biomater. (2010 ) 6:3110–9.

    Not in our library10.1016/j.actbio.2010.01.040

  124. 124.

    Petersen LK Phanse Y Ramer-Tait AE Wannemuehler MJ Narasimhan B. Amphiphilic polyanhydride nanoparticles stabilize Bacillus anthracis protective antigen. Mol Pharm. (2012 ) 9:874–82.

    Not in our library10.1021/mp2004059

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    Ulery BD Kumar D Ramer-Tait AE Metzger DW Wannemuehler MJ Narasimhan B. Design of a protective single-dose intranasal nanoparticle-based vaccine platform for respiratory infectious diseases. PLoS ONE (2011 ) 6:e17642.

    Not in our library10.1371/journal.pone.0017642

  126. 126.

    Ulery BD Petersen LK Phanse Y Kong CS Broderick SR Kumar D. Rational design of pathogen-mimicking amphiphilic materials as nanoadjuvants. Sci Rep. (2011 ) 1:198.

    Not in our library10.1038/srep00198

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    Ross KA Haughney SL Petersen LK Boggiatto P Wannemuehler MJ Narasimhan B. Lung deposition and cellular uptake behavior of pathogen-mimicking nanovaccines in the first 48 hours. Adv Healthc Mater. (2014 ) 3:1071–7.

    Not in our library10.1002/adhm.201300525

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    Scheerlinck JP Greenwood DL. Virus-sized vaccine delivery systems. Drug Discov Today (2008 ) 13:882–7.

    Not in our library10.1016/j.drudis.2008.06.016

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    Schneider-Ohrum K Ross TM. Virus-like particles for antigen delivery at mucosal surfaces. In: Kozlowski PA editor. Mucosal Vaccines: Modern Concepts, Strategies, and Challenges. (Berlin;Heidelberg: Springer) (2012 ). pp. 53–73.

    Not in our library10.1007/82_2011_135

  130. 130.

    Lawson DM Artymiuk PJ Yewdall SJ Smith JM Livingstone JC Treffry A. Solving the structure of human H ferritin by genetically engineering intermolecular crystal contacts. Nature (1991 ) 349:541–4.

    Not in our library10.1038/349541a0

  131. 131.

    Lee LA Wang Q. Adaptations of nanoscale viruses and other protein cages for medical applications. Nanomedicine (2006 ) 2:137–49.

    Not in our library10.1016/j.nano.2006.07.009

  132. 132.

    Li CQ Soistman E Carter DC Ferritin nanoparticle technology. A new platform for antigen presentation and vaccine development. Ind Biotechnol. (2006 ) 2:143–7.

    Not in our library10.1089/ind.2006.2.143

  133. 133.

    Yamashita I Iwahori K Kumagai S. Ferritin in the field of nanodevices. Biochim Biophys Acta (2010 ) 1800:846–57.

    Not in our library10.1016/j.bbagen.2010.03.005

  134. 134.

    Yang S Wang T Bohon J Gagne ME Bolduc M Leclerc D. Crystal structure of the coat protein of the flexible filamentous papaya mosaic virus. J Mol Biol. (2012 ) 422:263–73.

    Not in our library10.1016/j.jmb.2012.05.032

  135. 135.

    Babin C Majeau N Leclerc D. Engineering of papaya mosaic virus (PapMV) nanoparticles with a CTL epitope derived from influenza NP. J Nanobiotechnol. (2013 ) 11:10.

    Not in our library10.1186/1477-3155-11-10

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    Kanekiyo M Wei CJ Yassine HM Mctamney PM Boyington JC Whittle JR. Self-assembling influenza nanoparticle vaccines elicit broadly neutralizing H1N1 antibodies. Nature (2013 ) 499:102–6.

    Not in our library10.1038/nature12202

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    Coleman CM Liu YV Mu H Taylor JK Massare M Flyer DC. Purified coronavirus spike protein nanoparticles induce coronavirus neutralizing antibodies in mice. Vaccine (2014 ) 32:3169–74.

    Not in our library10.1016/j.vaccine.2014.04.016

  138. 138.
    Self-assembling protein nanoparticles in the design of vaccines · 2015
    No notice
  139. 139.

    Park H-J Lee E-Y Jung S Ko HL Lee S-M Nam J-H Spike nanoparticle and recombinant adenovirus 5 vaccines induce specific antibodies against the Middle East respiratory syndrome coronavirus (MERS-CoV). J Immunol. (2017 ) 198:225.

    Not in our library

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    Therien A Bedard M Carignan D Rioux G Gauthier-Landry L Laliberte-Gagne ME. A versatile papaya mosaic virus (PapMV) vaccine platform based on sortase-mediated antigen coupling. J Nanobiotechnol. (2017 ) 15:54.

    Not in our library10.1186/s12951-017-0289-y

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    Double-layered protein nanoparticles induce broad protection against divergent influenza A viruses · 2018
    No notice
  142. 142.

    Kushnir N Streatfield SJ Yusibov V. Virus-like particles as a highly efficient vaccine platform: diversity of targets and production systems and advances in clinical development. Vaccine (2012 ) 31:58–83.

    Not in our library10.1016/j.vaccine.2012.10.083

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    Mathieu C Rioux G Dumas MC Leclerc D. Induction of innate immunity in lungs with virus-like nanoparticles leads to protection against influenza and Streptococcus pneumoniae challenge. Nanomedicine (2013 ) 9:839–48.

    Not in our library10.1016/j.nano.2013.02.009

  144. 144.

    Zeltins A. Construction and characterization of virus-like particles: a review. Mol Biotechnol. (2013 ) 53:92–107.

    Not in our library10.1007/s12033-012-9598-4

  145. 145.

    Zhao Q Li S Yu H Xia N Modis Y. Virus-like particle-based human vaccines: quality assessment based on structural and functional properties. Trends Biotechnol. (2013 ) 31:654–63.

    Not in our library10.1016/j.tibtech.2013.09.002

  146. 146.

    Mohsen MO Zha L Cabral-Miranda G Bachmann MF. Major findings and recent advances in virus-like particle (VLP)-based vaccines. Semin Immunol. (2017 ) 34:123–32.

    Not in our library10.1016/j.smim.2017.08.014

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    Lang R Winter G Vogt L Zurcher A Dorigo B Schimmele B. Rational design of a stable, freeze-dried virus-like particle-based vaccine formulation. Drug Dev Ind Pharm. (2009 ) 35:83–97.

    Not in our library10.1080/03639040802192806

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    Feliu N Docter D Heine M Del Pino P Ashraf S Kolosnjaj-Tabi J. In vivo degeneration and the fate of inorganic nanoparticles. Chem Soc Rev. (2016 ) 45:2440–57.

    Not in our library10.1039/c5cs00699f

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    Giner-Casares JJ Henriksen-Lacey M Coronado-Puchau M Liz-Marzán LM Inorganic nanoparticles for biomedicine: where materials scientists meet medical research. Mater Today (2016 ) 19:19–28.

    Not in our library

  150. 150.

    Bastus NG Sanchez-Tillo E Pujals S Farrera C Kogan MJ Giralt E. Peptides conjugated to gold nanoparticles induce macrophage activation. Mol Immunol. (2009 ) 46:743–8.

    Not in our library10.1016/j.molimm.2008.08.277

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    Kang S Ahn S Lee J Kim JY Choi M Gujrati V. Effects of gold nanoparticle-based vaccine size on lymph node delivery and cytotoxic T-lymphocyte responses. J Control Release (2017 ) 256:56–67.

    Not in our library10.1016/j.jconrel.2017.04.024

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    Hiramatsu H Osterloh FE A simple large-scale synthesis of nearly monodisperse gold and silver nanoparticles with adjustable sizes and with exchangeable surfactants. Chem Mater. (2004 ) 16:2509–11.

    Not in our library10.1021/cm049532v

  153. 153.

    Pensa E Cortes E Corthey G Carro P Vericat C Fonticelli MH. The chemistry of the sulfur-gold interface: in search of a unified model. Acc Chem Res. (2012 ) 45:1183–92.

    Not in our library10.1021/ar200260p

  154. 154.

    Spampinato V Parracino MA La Spina R Rossi F Ceccone G. Surface analysis of gold nanoparticles functionalized with thiol-modified glucose SAMs for biosensor applications. Front Chem. (2016 ) 4:8.

    Not in our library10.3389/fchem.2016.00008

  155. 155.

    Belmouaddine H Shi M Sanche L Houde D. Tuning the size of gold nanoparticles produced by multiple filamentation of femtosecond laser pulses in aqueous solutions. Phys Chem Chem Phys. (2018 ) 20:23403–13.

    Not in our library10.1039/c8cp02054j

  156. 156.

    Wang C Zhu W Luo Y Wang BZ. Gold nanoparticles conjugating recombinant influenza hemagglutinin trimers and flagellin enhanced mucosal cellular immunity. Nanomedicine (2018 ) 14:1349–60.

    Not in our library10.1016/j.nano.2018.03.007

  157. 157.

    Cao-Milan R Liz-Marzan LM. Gold nanoparticle conjugates: recent advances toward clinical applications. Expert Opin Drug Deliv. (2014 ) 11:741–52.

    Not in our library10.1517/17425247.2014.891582

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    Jazayeri MH Amani H Pourfatollah AA Pazoki-Toroudi H Sedighimoghaddam B Various methods of gold nanoparticles (GNPs) conjugation to antibodies. Sens Bio Sensing Res. (2016 ) 9:17–22.

    Not in our library10.1016/j.sbsr.2016.04.002

  159. 159.

    Salazar-Gonzalez JA Gonzalez-Ortega O Rosales-Mendoza S. Gold nanoparticles and vaccine development. Exp Rev Vaccines (2015 ) 14:1197–211.

    Not in our library10.1586/14760584.2015.1064772

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    Marques Neto LM Kipnis A Junqueira-Kipnis AP. Role of metallic nanoparticles in vaccinology: implications for infectious disease vaccine development. Front Immunol. (2017 ) 8:239.

    Not in our library10.3389/fimmu.2017.00239

  161. 161.

    Tao W Ziemer KS Gill HS. Gold nanoparticle-M2e conjugate coformulated with CpG induces protective immunity against influenza a virus. Nanomedicine (2014 ) 9:237–51.

    Not in our library10.2217/nnm.13.58

  162. 162.

    Boisselier E Astruc D. Gold nanoparticles in nanomedicine: preparations, imaging, diagnostics, therapies and toxicity. Chem Soc Rev. (2009 ) 38:1759–82.

    Not in our library10.1039/b806051g

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