Murine granulocyte-macrophage colony-stimulating factor expressed from a bicistronic simian immunodeficiency virus-based integrase-defective lentiviral vector does not enhance T-cell responses in mice.
Journal Article (Journal Article)
As a prelude to immunization studies in nonhuman primates, we compared in mice the immunogenicity of a simian immunodeficiency virus (SIV)-based integrase (IN)-defective lentiviral vector (IDLV) encoding the model antigen-enhanced green fluorescence protein (eGFP) in the presence or absence of the murine granulocyte-macrophage colony-stimulating factor (mGM-CSF) expressed from an internal ribosomal entry site (IRES) sequence. BALB/c mice were immunized once intramuscularly with IDLV expressing eGFP alone or eGFP and mGM-CSF and immune responses were evaluated up to 90 days from the single intramuscular immunization. Results indicated that the mGM-CSF was unable to improve the magnitude and quality of the immune response against the eGFP transgene in the context of the SIV-based IDLV, as evaluated by enzyme-linked immunosorbent spot (ELISPOT) assays for interferon-γ (IFN-γ) and by intracellular cytokine staining for IFN-γ, interleukin-2 (IL-2), and tumor necrosis factor-alpha (TNF-α). These findings suggest that for vaccination purposes, the presence of mGM-CSF expressed after the IRES in a SIV-based IDLV system does not favor the improvement of the immunological response against the transgene of interest. Further studies should investigate whether the selection of a different cytokine gene might improve the immune response against the transgene.
Full Text
Duke Authors
Cited Authors
- Michelini, Z; Negri, D; Biava, M; Baroncelli, S; Spada, M; Leone, P; Bona, R; Blasi, M; Nègre, D; Klotman, ME; Cara, A
Published Date
- December 2014
Published In
Volume / Issue
- 27 / 10
Start / End Page
- 512 - 520
PubMed ID
- 25343523
Electronic International Standard Serial Number (EISSN)
- 1557-8976
Digital Object Identifier (DOI)
- 10.1089/vim.2014.0062
Language
- eng
Conference Location
- United States