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Skakic I, Taki AC, Francis JE, Dekiwadia C, Van TTH, Joe CCD, Phan T, Lovrecz G, Gorry PR, Ramsland PA, Walduck AK, Smooker PM. Nanocapsules Comprised of Purified Protein: Construction and Applications in Vaccine Research. Vaccines (Basel) 2024; 12:410. [PMID: 38675791 PMCID: PMC11053559 DOI: 10.3390/vaccines12040410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 04/03/2024] [Accepted: 04/10/2024] [Indexed: 04/28/2024] Open
Abstract
Nanoparticles show great promise as a platform for developing vaccines for the prevention of infectious disease. We have been investigating a method whereby nanocapsules can be formulated from protein, such that the final capsules contain only the cross-linked protein itself. Such nanocapsules are made using a silica templating system and can be customised in terms of size and porosity. Here we compare the construction and characteristics of nanocapsules from four different proteins: one a model protein (ovalbumin) and three from infectious disease pathogens, namely the influenza virus, Helicobacter pylori and HIV. Two of the nanocapsules were assessed further. We confirm that nanocapsules constructed from the urease A subunit of H. pylori can reduce subsequent infection in a vaccinated mouse model. Further, we show that capsules constructed from the HIV gp120 protein can be taken up by dendritic cells in tissue culture and can be recognised by antibodies raised against the virus. These results point to the utility of this method in constructing protein-only nanocapsules from proteins of varying sizes and isoelectric points.
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Affiliation(s)
- Ivana Skakic
- School of Science, RMIT University, 264 Plenty Road, Bundoora, VIC 3083, Australia; (I.S.); (J.E.F.); (T.T.H.V.); (P.A.R.)
| | - Aya C. Taki
- Melbourne Veterinary School, Faculty of Science, The University of Melbourne, Parkville, VIC 3010, Australia;
| | - Jasmine E. Francis
- School of Science, RMIT University, 264 Plenty Road, Bundoora, VIC 3083, Australia; (I.S.); (J.E.F.); (T.T.H.V.); (P.A.R.)
| | - Chaitali Dekiwadia
- RMIT Microscopy & Microanalysis Facility, School of Science, RMIT University, Melbourne, VIC 3001, Australia;
| | - Thi Thu Hao Van
- School of Science, RMIT University, 264 Plenty Road, Bundoora, VIC 3083, Australia; (I.S.); (J.E.F.); (T.T.H.V.); (P.A.R.)
| | - Carina C. D. Joe
- CSIRO Manufacturing, Clayton, VIC 3169, Australia; (C.C.D.J.); (T.P.); (G.L.)
| | - Tram Phan
- CSIRO Manufacturing, Clayton, VIC 3169, Australia; (C.C.D.J.); (T.P.); (G.L.)
| | - George Lovrecz
- CSIRO Manufacturing, Clayton, VIC 3169, Australia; (C.C.D.J.); (T.P.); (G.L.)
| | - Paul R. Gorry
- Department of Microbiology and Immunology, University of Melbourne, Peter Doherty Institute of Infection and Immunity, Parkville, VIC 3010, Australia;
| | - Paul A. Ramsland
- School of Science, RMIT University, 264 Plenty Road, Bundoora, VIC 3083, Australia; (I.S.); (J.E.F.); (T.T.H.V.); (P.A.R.)
- Department of Immunology, Monash University, Melbourne, VIC 3004, Australia
- Department of Surgery, Austin Health, The University of Melbourne, Heidelberg, VIC 3084, Australia
| | - Anna K. Walduck
- School of Science, RMIT University, 264 Plenty Road, Bundoora, VIC 3083, Australia; (I.S.); (J.E.F.); (T.T.H.V.); (P.A.R.)
| | - Peter M. Smooker
- School of Science, RMIT University, 264 Plenty Road, Bundoora, VIC 3083, Australia; (I.S.); (J.E.F.); (T.T.H.V.); (P.A.R.)
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Francis JE, Skakic I, Majumdar D, Taki AC, Shukla R, Walduck A, Smooker PM. Solid Lipid Nanoparticles Delivering a DNA Vaccine Encoding Helicobacter pylori Urease A Subunit: Immune Analyses before and after a Mouse Model of Infection. Int J Mol Sci 2024; 25:1076. [PMID: 38256149 PMCID: PMC10816323 DOI: 10.3390/ijms25021076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 01/08/2024] [Accepted: 01/13/2024] [Indexed: 01/24/2024] Open
Abstract
In this study, novel solid lipid particles containing the adjuvant lipid monophosphoryl lipid A (termed 'SLN-A') were synthesised. The SLN-A particles were able to efficiently bind and form complexes with a DNA vaccine encoding the urease alpha subunit of Helicobacter pylori. The resultant nanoparticles were termed lipoplex-A. In a mouse model of H. pylori infection, the lipoplex-A nanoparticles were used to immunise mice, and the resultant immune responses were analysed. It was found that the lipoplex-A vaccine was able to induce high levels of antigen-specific antibodies and an influx of gastric CD4+ T cells in vaccinated mice. In particular, a prime with lipoplex-A and a boost with soluble UreA protein induced significantly high levels of the IgG1 antibody, whereas two doses of lipoplex-A induced high levels of the IgG2c antibody. In this study, lipoplex-A vaccination did not lead to a significant reduction in H. pylori colonisation in a challenge model; however, these results point to the utility of the system for delivering DNA vaccine-encoded antigens to induce immune responses and suggest the ability to tailor those responses.
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Affiliation(s)
- Jasmine E. Francis
- School of Science, RMIT University, 264 Plenty Road, Bundoora, VIC 3083, Australia; (J.E.F.); (I.S.); (D.M.); (R.S.); (A.W.)
| | - Ivana Skakic
- School of Science, RMIT University, 264 Plenty Road, Bundoora, VIC 3083, Australia; (J.E.F.); (I.S.); (D.M.); (R.S.); (A.W.)
| | - Debolina Majumdar
- School of Science, RMIT University, 264 Plenty Road, Bundoora, VIC 3083, Australia; (J.E.F.); (I.S.); (D.M.); (R.S.); (A.W.)
| | - Aya C. Taki
- Melbourne Veterinary School, Faculty of Science, The University of Melbourne, Parkville, VIC 3010, Australia;
| | - Ravi Shukla
- School of Science, RMIT University, 264 Plenty Road, Bundoora, VIC 3083, Australia; (J.E.F.); (I.S.); (D.M.); (R.S.); (A.W.)
| | - Anna Walduck
- School of Science, RMIT University, 264 Plenty Road, Bundoora, VIC 3083, Australia; (J.E.F.); (I.S.); (D.M.); (R.S.); (A.W.)
| | - Peter M. Smooker
- School of Science, RMIT University, 264 Plenty Road, Bundoora, VIC 3083, Australia; (J.E.F.); (I.S.); (D.M.); (R.S.); (A.W.)
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