title: Display of neutralizing epitopes of Canine parvovirus and a T-cell epitope of the fusion protein of Canine distemper virus on chimeric tymovirus-like particles and its use as a vaccine candidate both against Canine parvo and Canine distemper.
abstract: Expression of Physalis mottle tymovirus coat protein in Escherichia coli was earlier shown to self-assemble into empty capsids that were nearly identical to the capsids formed in vivo. Amino acid substitutions were made at the N-terminus of wild-type Physalis mottle virus coat protein with neutralizing epitopes of Canine parvovirus containing the antigenic sites 1-2, 4 and 6-7 and T-cell epitope of the fusion protein of Canine distemper virus in various combinations to yield PhMV1, PhMV2, PhMV3, PhMV4 and PhMV5. These constructs were cloned and expressed in E. coli. The chimeric proteins self-assembled into chimeric tymovirus-like particles (TVLPs) as determined by electron microscopy. The TVLPs were purified by ultracentrifugation and injected into guinea pigs and dogs to determine their immunogenicity. Initial immunogenicity studies in guinea pigs indicated that PhMV3 gave a higher response in comparison to the other TVLPs for both CPV and CDV and hence all further experiments in dogs were done with PhMV3. HI was done against different isolates obtained from various parts of the country. Protective titres indicated the broad spectrum of the vaccine. In conclusion the study indicated that the above chimeric VLP based vaccine could be used in dogs to generate a protective immune response against diseases caused by both Canine parvo and Canine distemper virus.
authors.affiliation: Indian Immunologicals Limited, Rakshapuram, Gachibowli, Hyderabad 500032, Andhra Pradesh, India.
authors.forename: Dev
authors.initials: D
authors.lastname: Chandran
authors.forename: Pallichera Vijayan
authors.initials: PV
authors.lastname: Shahana
authors.forename: Gudavelli Sudha
authors.initials: GS
authors.lastname: Rani
authors.forename: Parthasarthy
authors.initials: P
authors.lastname: Sugumar
authors.forename: Chinchkar Ramchandra
authors.initials: CR
authors.lastname: Shankar
authors.forename: Villuppanoor Alwar
authors.initials: VA
authors.lastname: Srinivasan
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D036022:Capsid Proteins / Q000276:immunology; D002460:Cell Line; D004216:Distemper / Q000276:immunology / Q000517:prevention & control*; D004217:Distemper Virus, Canine / Q000276:immunology; D004285:Dogs; D018984:Epitopes, T-Lymphocyte / Q000276:immunology*; D006168:Guinea Pigs; D006385:Hemagglutination Inhibition Tests; D009500:Neutralization Tests; D010322:Parvoviridae Infections / Q000276:immunology / Q000517:prevention & control*; D017993:Parvovirus, Canine / Q000276:immunology; D011817:Rabbits; D011993:Recombinant Fusion Proteins / Q000276:immunology; D014614:Vaccines, Synthetic / Q000276:immunology; D014760:Viral Fusion Proteins / Q000276:immunology*; D014765:Viral Vaccines / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral; D036022:Capsid Proteins; D018984:Epitopes, T-Lymphocyte; D011993:Recombinant Fusion Proteins; D014614:Vaccines, Synthetic; D014760:Viral Fusion Proteins; D014765:Viral Vaccines; C108931:capsid protein, Physalis mottle virus; C076619:F protein, Phocine distemper virus