Induction of IL-2 and IFN- in BALB/c mice immunised with subunit influenza A vaccine in combination with whole cell or acellular DTP vaccine Free

Abstract

Splenocytes from mice immunised with two doses of subunit influenza A/Beijing/353/89 vaccine mixed with whole cell DTP (wDTP), acellular DTP (aDTP) or PBS were collected 7 and 10 days after the second immunisation, and re-stimulated with subunit influenza vaccine or live virus . Interleukin-2 (IL-2) and interferon- (IFN-) were assayed in supernates from these cultures by an ELISA procedure. Splenocytes from mice given subunit influenza vaccine in wDTP produced greater than two-fold and greater than five-fold responses of IL-2 and IFN-, respectively, compared with splenocytes from mice immunised with subunit vaccine alone. In contrast, the response of splenocytes from mice immunised with subunit vaccine in saline or aDTP was similar, significantly less than for vaccine in wDTP (p < 0.01) and only slightly greater than for controls (p < 0.05). The production of IL-2 and IFN- by these spleen cells was not significantly different on days 7 and 10 post-immunisation. Previous reports have shown that wDTP and aDTP enhance the serum antibody response of mice to influenza vaccine, but wDTP enhanced the response 100-fold greater than aDTP, and induced greater IgG2a and IgG2b subclass antibody responses; this last result indicates a cell-mediated immune response to vaccine. The present studies confirm these earlier findings; furthermore, as the IL-2 and IFN- responses of splenocytes are associated with Th-1 subset T-lymphocyte response, the findings indicate a cytotoxic T-cell response to immunisation. The results indicate that influenza vaccine combined with wDTP induced a cell-mediated response in mice, which could confer a more solid immunity to challenge virus infection.

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1997-01-01
2024-03-29
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