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. 1988 Mar;63(3):355–362.

Role of interferon-gamma in T-cell responses to Semliki Forest virus-infected murine brain cells.

P T Tomkins 1, G A Ward 1, A G Morris 1
PMCID: PMC1454749  PMID: 2832313

Abstract

Primary brain cell cultures prepared from newborn C3H mice were infected with Semliki Forest virus (SFV) or treated with a beta-propiolactone-inactivated preparation of SFV (BPL-SFV). The effects of recombinant interferon-gamma (IFN-gamma) treatment on SFV replication, SFV antigen display, major histocompatibility complex (MHC) class I and class II antigen expression, susceptibility to lysis by SFV-specific cytotoxic T lymphocytes (CTL) and the ability to stimulate SFV-specific T lymphocytes to release IFN-gamma were determined. The IFN-gamma treatment prevented replication of SFV, as determined by incorporation of [3H]uridine into SFV-RNA, and reduced expression of SFV antigens on the cell surface, as determined by lysis with antibody and complement or indirect immunofluorescence. BPL-SFV-treated brain cells expressed no SFV antigen detectable by lysis with antibody and complement or indirect immunofluorescence. IFN-gamma increased expression of MHC class I and class II antigens, measured by indirect immunofluorescence, susceptibility to killing by alloreactive T-cell lines and ability to stimulate an allogeneic mixed lymphocyte reaction (MLR). Brain cells infected with SFV or treated with BPL-SFV were susceptible to killing by the CTL. The killing was MHC restricted and neither uninfected nor untreated cells were killed. IFN-gamma treatment prior to SFV infection or BPL-SFV treatment resulted in an augmentation of lysis by the CTL, indicating that even where SFV antigen expression is reduced or present at very low levels, in the context of enhanced MHC class I expression cells remain susceptible to CTL killing. Brain cells treated with BPL-SFV stimulated SFV-specific T cells to release IFN-gamma. Pretreatment of brain cells with IFN-alpha beta or IFN-gamma prior to BPL-SFV treatment markedly increased the ability of the cells to stimulate the SFV-specific T cells to release IFN-gamma. Release of IFN-gamma was MHC restricted and brain cells untreated with BPL-SFV did not stimulate IFN-gamma release. IFN-gamma released by T cells stimulated with BPL-SFV-treated brain cells increased class II MHC expression by brain cells as assessed by indirect immunofluorescence.

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Selected References

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