title: Immunogenicity of a new type of yeast-derived hepatitis B vaccine consisting of M (pre-S2 + S) protein particles.
abstract: Genetically modified M (pre-S2+S; P31) protein (M-P31c) particles were formulated into a vaccine (TGP-943) through adsorption on to an alum adjuvant. The immunogenicity of this vaccine was investigated using guinea-pigs and various kinds of mice. In terms of anti-HBs(S) response, TGP-943 was found to be as immunogenic as the control plasma-derived vaccine (PDV) and yeast-derived S vaccine (YDSV) in Balb/c mice. TGP-943 induced anti-S antibodies even in S low-responder mice. In addition to the anti-S antibodies, TGP-943 was shown to elicit anti-pre-S2 antibodies dose-dependently, and the anti-pre-S2 antibodies were maintained at a high level after immunization with a high dose of TGP-943. The antibody response to pre-S2 had a tendency to appear earlier than that to S. M-P31c particles induced in vitro proliferation of TGP-943-primed lymph node cells, indicating that TGP-943 is more immunogenic than conventional vaccines in terms of T-cell levels. These results suggest that TGP-943 would be a promising candidate for a third generation hepatitis B vaccine.
authors.affiliation: Biotechnology Research Laboratories, Takeda Chemical Industries, Ltd., Osaka, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Hazama
authors.forename: M
authors.initials: M
authors.lastname: Takaoki
authors.forename: K
authors.initials: K
authors.lastname: Ohfune
authors.forename: S
authors.initials: S
authors.lastname: Hinuma
authors.forename: Y
authors.initials: Y
authors.lastname: Fujisawa
mesh_terms: D000818:Animals; D005260:Female; D006168:Guinea Pigs; D006510:Hepatitis B Antibodies / Q000032:analysis; D006514:Hepatitis B Surface Antigens / Q000276:immunology*; D017325:Hepatitis B Vaccines; D007114:Immunization; D007376:Interleukin-2 / Q000096:biosynthesis; D008213:Lymphocyte Activation; D051379:Mice; D008815:Mice, Inbred Strains; D011498:Protein Precursors / Q000276:immunology*; D014612:Vaccines / Q000276:immunology*; D014614:Vaccines, Synthetic / Q000276:immunology*; D014761:Viral Hepatitis Vaccines / Q000276:immunology*; D014763:Viral Matrix Proteins / Q000276:immunology*; D015003:Yeasts / Q000235:genetics
chemical_list: D006510:Hepatitis B Antibodies; D006514:Hepatitis B Surface Antigens; D017325:Hepatitis B Vaccines; D007376:Interleukin-2; D011498:Protein Precursors; D014612:Vaccines; D014614:Vaccines, Synthetic; D014761:Viral Hepatitis Vaccines; D014763:Viral Matrix Proteins; C050807:presurface protein 2, hepatitis B surface antigen