Antibody responses, cytokine levels and protection of mice immunised with HSV-2 antigens formulated into NISV or ISCOM delivery systems

Mohamedi, S.A., Brewer, J.M. , Alexander, J., Heath, A.W. and Jennings, R. (2000) Antibody responses, cytokine levels and protection of mice immunised with HSV-2 antigens formulated into NISV or ISCOM delivery systems. Vaccine, 18(20), pp. 2083-2094. (doi: 10.1016/S0264-410X(99)00567-8) (PMID:10715522)

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The immunogenicity of a type 2 herpes simplex virus (HSV-2) antigen preparation following its formulation into immunostimulating complexes (ISCOMs) or non-ionic surfactant vesicles (NISV) was investigated in a murine model. The immune responses induced by each formulation were characterised by antigen specific total and subclass serum responses, and by lymphocyte proliferation and cytokine (interleukin-2 (IL-2), interleukin-4 (IL-4) and interferon-gamma (IFN-γ)) production by in vitro restimulated spleen cells. The degree of protection afforded to mice by these various HSV-2 vaccine preparations against homologous (HSV-2) and heterologous (HSV-1) challenge infection was also determined. The findings suggest that formulation of the HSV-2 glycoprotein antigens with ISCOM or NISV delivery vehicles, and the methods used to prepare these formulations, influenced the immunogenicity of the final preparation. Higher IgG2a and neutralising antibody levels, IL-2 and IFN-γ levels and lymphoproliferative responses were noted in mice immunised with the HSV-2 ISCOM formulated vaccine preparation. Furthermore, although HSV-2 antigens formulated in dehydration–rehydration NISV, or entrapped in NISV by freeze–thawing at 30°C (HSV-2 NISV 30), also elicited relatively high antibody, IL-2 and IFN-γ levels and relatively high lymphoproliferative responses, formulation of HSV-2 antigens by freeze–thawing with NISV at 60°C (HSV-2 NISV 60) did not. There were no differences between any of the HSV-2 vaccine formulations in terms of IL-4 induction in in vitro stimulated spleen cell cultures. Almost complete protection against HSV-2 challenge was afforded by the HSV-2 ISCOM preparation, while partial protection against challenge infection was afforded by the HSV-2 NISV 30 vaccine formulation. The findings are discussed in relation to the nature of the immune mechanisms, particularly Th1- or Th2-like responses, that may be elicited by HSV-2 antigen preparations formulated into various delivery systems and the relevance of these immune responses to protection against HSV infection in the murine model.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Brewer, Professor James
Authors: Mohamedi, S.A., Brewer, J.M., Alexander, J., Heath, A.W., and Jennings, R.
College/School:College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation
Journal Name:Vaccine
ISSN (Online):1873-2518
Published Online:09 March 2000

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