title: Improved immunogenicity in mice of a mammalian cell-derived recombinant hepatitis B vaccine containing pre-S1 and pre-S2 antigens as compared with conventional yeast-derived vaccines.
abstract: The widely used hepatitis B virus (HBV) vaccines consist of the small hepatitis B surface (SHBs) protein produced in transfected yeast cells. The frequency of non-responders, especially among immunocompromised patients, has increased the demand for a more immunogenic vaccine. We evaluated the immunogenicity of recombinant HBs 20 nm particles secreted by transfected Chinese hamster ovary (CHO) cells, Bio-Hep-B (BioTechnology General Ltd, Israel), and compared it with yeast-derived vaccines. The CHO-derived vaccine contains the small hepatitis B surface antigen (SHBs protein) as the major component, as well as the middle HBs (MHBs, pre-S2) and the large HBs (LHBs, pre-S1) antigens. Nine groups of ten female Balb/c mice, 4-6 weeks old, were injected once intraperitoneally (i.p.) with 0.09, 0.27 or 0.81 micrograms of each of three vaccines: Bio-Hep-B or two conventional yeast-derived recombinant vaccines, Engerix-B (SmithKline Beecham, Belgium) and H-B-Vax II (Merck, Sharp & Dohme, USA) containing only non-glycosylated SHBs antigen. After 30 days, 40% of the mice injected with 0.09 microgram Bio-Hep-B had seroconverted, but none of the mice receiving the same dose of the other vaccines. The immunogenic dose in 50% of the mice at day 14 after injection was 0.13 microgram for Bio-Hep-B, but over 0.81 microgram for the other two vaccines. Mice of the strain B10/M (which are unresponsive to SHBs and MHBs antigens at the T-cell level) developed 100-fold higher anti-HBs titres after immunization with 1 microgram of Bio-Hep-B i.p., as compared with mice receiving the same amount of yeast-derived HBsAg vaccines.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Liver Unit, Hadassah University Hospital, Jerusalem, Israel.
authors.forename: D
authors.initials: D
authors.lastname: Shouval
authors.forename: Y
authors.initials: Y
authors.lastname: Ilan
authors.forename: R
authors.initials: R
authors.lastname: Adler
authors.forename: R
authors.initials: R
authors.lastname: Deepen
authors.forename: A
authors.initials: A
authors.lastname: Panet
authors.forename: Z
authors.initials: Z
authors.lastname: Even-Chen
authors.forename: M
authors.initials: M
authors.lastname: Gorecki
authors.forename: W H
authors.initials: WH
authors.lastname: Gerlich
mesh_terms: D000818:Animals; D016466:CHO Cells; D006224:Cricetinae; D000939:Epitopes / Q000276:immunology; D005260:Female; D006514:Hepatitis B Surface Antigens / Q000276:immunology*; D017325:Hepatitis B Vaccines / Q000235:genetics / Q000276:immunology*; D051379:Mice; D008815:Mice, Inbred Strains; D011498:Protein Precursors / Q000276:immunology*; D012441:Saccharomyces cerevisiae / Q000235:genetics; D013045:Species Specificity; D014614:Vaccines, Synthetic / Q000235:genetics / Q000276:immunology*; D014759:Viral Envelope Proteins / Q000276:immunology*
chemical_list: D000939:Epitopes; D006514:Hepatitis B Surface Antigens; D017325:Hepatitis B Vaccines; D011498:Protein Precursors; D014614:Vaccines, Synthetic; D014759:Viral Envelope Proteins; C050806:presurface protein 1, hepatitis B surface antigen; C050807:presurface protein 2, hepatitis B surface antigen