ABSTRACT
Abstract INTRODUCTION: Pseudo-infectious yellow fever viral particles (YFV-PIVs) have been used to study vaccines and viral packaging. Here, we report the development of a packaging cell line, which expresses the YFV prM/E proteins. METHODS: HEK293 cells were transfected with YFV prM/E and C (84 nt) genes to generate HEK293-YFV-PrM/E-opt. The cells were evaluated for their ability to express the heterologous proteins and to package the replicon repYFV-17D-LucIRES, generating YFV-PIVs. RESULTS: The expression of prM/E proteins was confirmed, and the cell line trans-packaged the replicon for recovery of a reporter for the YFV-PIVs. CONCLUSIONS: HEK293-YFV-prM/E-opt trans-packaging capacity demonstrates its possible biotechnology application.
Subject(s)
Humans , Virus Replication/immunology , Yellow fever virus/immunology , Virus Assembly/immunology , Vaccines, Virus-Like Particle/immunology , Virus Replication/genetics , Yellow fever virus/genetics , Virus Assembly/genetics , Fluorescent Antibody Technique, Indirect , Green Fluorescent Proteins , HEK293 Cells , Vaccines, Virus-Like Particle/genetics , Flow CytometryABSTRACT
Objectives: To analyze the immunogenicity of virus-like particles (VLP) of human papillomavirus type 16 (HPV16) isolated in East China and the adjuvant potential of interleukin-12 (IL-12). Methods: The variant HPV16 L1VLP expressed in sf9 insect cells were purified with cesium chloride gradient centrifugation. BALB/c mice were vaccinated with VLP (L1N), VLP with Freund's adjuvant (L1A) or VLP with IL-12 recombinant plasmid (L1P). HPV16 VLP specific IgG and IFN-γ level in the serum were detected by ELISA, and the percentage of CD4+ and CD8+ in spleen cells was detected with flow cytometry. Results: The titers of serum IgG antibodies in vaccinated groups were higher than in negative control and the serum antibodies mainly recognized conformation-dependent HPV16 VLP epitopes. Splenic CD4+ and CD8+ T cell subsets increased after vaccination in every experimental group, and CD8+ increased obviously in L1P group. The ratio of CD4+/CD8+ decreased in L1P group and increased in the other two groups, compared to control group. Vaccination induced specific secretion of IFN-γ in the serum of vaccinated group (p < 0.05), especially in the L1P group. Conclusions: VLP of HPV16 variant strain isolated in East China could induce humoral immunity and cellular immunity in mice, and IL-12 recombinant plasmid can enhance cellular immunity. .
Subject(s)
Animals , Female , Humans , Mice , /immunology , /blood , /genetics , Papillomavirus Infections/prevention & control , Vaccines, Virus-Like Particle/immunology , Adjuvants, Immunologic , Antibodies, Viral/blood , Antibodies, Viral/immunology , Enzyme-Linked Immunosorbent Assay , Flow Cytometry , Immunity, Cellular/immunology , Immunoglobulin G/blood , Immunoglobulin G/immunology , /immunology , Mice, Inbred BALB C , Molecular Sequence Data , Papillomavirus Infections/immunologyABSTRACT
Virus-like particles (VLPs) composed of the truncated capsid protein of swine hepatitis E virus (HEV) were developed and immune responses of mice immunized with the VLPs were evaluated. IgG titers specific for the capsid protein of swine HEV were significantly higher for all groups of mice immunized with the VLPs than those of the negative control mice. Splenocytes from mice immunized with the VLPs also produced significantly greater quantities of interferon (IFN)-gamma than interleukin (IL)-4 and IL-10. These newly developed swine HEV VLPs have the capacity to induce antigen-specific antibody and IFN-gamma production in immunized mice.