Development of candidate combination vaccine for hepatitis E and hepatitis B: a liposome encapsulation approach

Vaccine. 2009 Nov 5;27(47):6582-8. doi: 10.1016/j.vaccine.2009.08.033. Epub 2009 Sep 9.

Abstract

To reduce extra injections, cost and ensure better coverage, use of combination vaccines is preferable. An attempt was made to evaluate the encapsulation of hepatitis E virus neutralizing epitope (NE) region and hepatitis B virus surface antigen (HBsAg) in liposomes as DNAs, proteins and DNA+protein. Mice groups were immunized with different liposome-encapsulated formulations and monitored for anti-HEV and anti-HBs titres, IgG subtypes, antigen-specific lymphocyte proliferation and cytokine levels. The protective levels of anti-HBs and in vitro virus-binding capacity of anti-HEV antibodies were assessed. Liposome-encapsulated DNA either singly or in combination did not elicit antibody response. Anti-HEV and anti-HBs IgG titres of individual component of protein alone (Lipo-E-P/Lipo-B-P) or DNA+protein formulations (Lipo-E-DP/Lipo-B-DP) were comparable to respective titres in combination vaccine of protein (Lipo-BE-P) and DNA+protein formulations (Lipo-BE-DP). IgG1 levels were significantly higher in Lipo-BE-P group whereas, equivalent levels of IgG1 and IgG2a were observed in Lipo-BE-DP group against both components of the vaccine. Combination vaccine group showed mixed Th1/Th2 cytokine profile. Liposome entrapped NE and HBsAg in protein and DNA+protein formats induce excellent immune response to both the components and need to be evaluated in higher animals.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antibody Formation
  • Cell Proliferation
  • Cytokines / immunology
  • Female
  • Hepatitis Antibodies / blood
  • Hepatitis B / immunology
  • Hepatitis B / prevention & control*
  • Hepatitis B Surface Antigens / immunology
  • Hepatitis E / immunology
  • Hepatitis E / prevention & control*
  • Immunity, Cellular
  • Immunoglobulin G / blood
  • Liposomes / immunology*
  • Mice
  • Recombinant Proteins / immunology
  • Vaccines, Combined / immunology
  • Vaccines, DNA / immunology
  • Viral Hepatitis Vaccines / immunology*

Substances

  • Cytokines
  • Hepatitis Antibodies
  • Hepatitis B Surface Antigens
  • Immunoglobulin G
  • Liposomes
  • Recombinant Proteins
  • Vaccines, Combined
  • Vaccines, DNA
  • Viral Hepatitis Vaccines