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Lacasta A, Mody KT, De Goeyse I, Yu C, Zhang J, Nyagwange J, Mwalimu S, Awino E, Saya R, Njoroge T, Muriuki R, Ndiwa N, Poole EJ, Zhang B, Cavallaro A, Mahony TJ, Steinaa L, Mitter N, Nene V. Synergistic Effect of Two Nanotechnologies Enhances the Protective Capacity of the Theileria parva Sporozoite p67C Antigen in Cattle. J Immunol 2021; 206:686-699. [PMID: 33419770 PMCID: PMC7851744 DOI: 10.4049/jimmunol.2000442] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 12/03/2020] [Indexed: 11/19/2022]
Abstract
East Coast fever (ECF), caused by Theileria parva, is the most important tick-borne disease of cattle in sub-Saharan Africa. Practical disadvantages associated with the currently used live-parasite vaccine could be overcome by subunit vaccines. An 80-aa polypeptide derived from the C-terminal portion of p67, a sporozoite surface Ag and target of neutralizing Abs, was the focus of the efforts on subunit vaccines against ECF and subjected to several vaccine trials with very promising results. However, the vaccination regimen was far from optimized, involving three inoculations of 450 μg of soluble p67C (s-p67C) Ag formulated in the Seppic adjuvant Montanide ISA 206 VG. Hence, an improved formulation of this polypeptide Ag is needed. In this study, we report on two nanotechnologies that enhance the bovine immune responses to p67C. Individually, HBcAg-p67C (chimeric hepatitis B core Ag virus-like particles displaying p67C) and silica vesicle (SV)-p67C (s-p67C adsorbed to SV-140-C18, octadecyl-modified SVs) adjuvanted with ISA 206 VG primed strong Ab and T cell responses to p67C in cattle, respectively. Coimmunization of cattle (Bos taurus) with HBcAg-p67C and SV-p67C resulted in stimulation of both high Ab titers and CD4 T cell response to p67C, leading to the highest subunit vaccine efficacy we have achieved to date with the p67C immunogen. These results offer the much-needed research depth on the innovative platforms for developing effective novel protein-based bovine vaccines to further the advancement.
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Affiliation(s)
- Anna Lacasta
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya;
| | - Karishma T Mody
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Ine De Goeyse
- Enzootic, Vector-borne and Bee Diseases, Sciensano, 1180 Brussels, Belgium.,Department of Biomedical Sciences, Institute of Tropical Medicine, 2000 Antwerp, Belgium
| | - Chengzhong Yu
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Jun Zhang
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - James Nyagwange
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
| | - Stephen Mwalimu
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
| | - Elias Awino
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
| | - Rosemary Saya
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
| | - Thomas Njoroge
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
| | - Robert Muriuki
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
| | - Nicholas Ndiwa
- Research Methods Group, International Livestock Research Institute, Nairobi 00100, Kenya; and
| | - Elisabeth Jane Poole
- Research Methods Group, International Livestock Research Institute, Nairobi 00100, Kenya; and
| | - Bing Zhang
- Department of Agriculture and Fisheries, Brisbane, Queensland 4102, Australia
| | - Antonino Cavallaro
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Timothy J Mahony
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Lucilla Steinaa
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
| | - Neena Mitter
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Vishvanath Nene
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
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Caljon G, Broos K, De Goeyse I, De Ridder K, Sternberg JM, Coosemans M, De Baetselier P, Guisez Y, Den Abbeele JV. Identification of a functional Antigen5-related allergen in the saliva of a blood feeding insect, the tsetse fly. Insect Biochem Mol Biol 2009; 39:332-341. [PMID: 19507303 DOI: 10.1016/j.ibmb.2009.01.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Our previous screening of a Glossina morsitans morsitans lamdagt11 salivary gland expression library with serum of a tsetse fly exposed rabbit identified a cDNA encoding Tsetse Antigen5 (TAg5, 28.9 kDa), a homologue of Antigen5 sting venom allergens. Recombinant TAg5 was produced in Sf9 cells in order to assess its immunogenic properties in humans. Plasma from a patient that previously exhibited anaphylactic reactions against tsetse fly bites contained circulating anti-TAg5 and anti-saliva IgEs. In a significant proportion of plasma samples of African individuals, TAg5 and saliva binding IgEs (respectively 56 and 65%) can be detected. Saliva, harvested from flies that were subjected to TAg5- specific RNA interference (RNAi), displayed significantly reduced IgE binding potential. Allergenic properties of TAg5 and tsetse fly saliva were further illustrated in immunized mice, using an immediate cutaneous hypersensitivity and passive cutaneous anaphylaxis assay. Collectively, TAg5 was illustrated to be a tsetse fly salivary allergen, demonstrating that Antigen5-related proteins are represented as functional allergens not only in stinging but also in blood feeding insects.
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Affiliation(s)
- Guy Caljon
- Department of Parasitology, Institute of Tropical Medicine Antwerp, Belgium
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