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. 1991 Mar;59(3):925–931. doi: 10.1128/iai.59.3.925-931.1991

Resolution of chlamydial genital infection with antigen-specific T-lymphocyte lines.

K H Ramsey 1, R G Rank 1
PMCID: PMC258348  PMID: 1705244

Abstract

To determine cell-mediated immune mechanisms involved in the resolution of chlamydial genital infection of mice, we utilized an established murine model in which it has been demonstrated that resolution of infection occurs independently of the antibody response. Splenic T lymphocytes were obtained from mice that had previously been immunized with viable elementary bodies of the mouse pneumonitis agent (MoPn), a Chlamydia trachomatis biovar. Antigen-reactive T lymphocytes were maintained and expanded in vitro by frequent restimulation with UV light-inactivated MoPn in the presence of antigen-presenting cells and recombinant interleukin-2 (rIL-2). Flow cytometry indicated that this cell line was at least 92% positive for the pan-specific T-cell marker Thy1.2. Stimulation of the cells in the presence of syngeneic antigen-presenting cells plus MoPn antigen and in the absence of exogenous IL-2 induced the cells to produce IL-2 activity in culture supernatants. Following adoptive transfer, this T-lymphocyte line was effective in inducing resolution of an ongoing MoPn genital infection in congenitally athymic nude mice which otherwise maintain chronic unresolved infections. The line was less efficient in resolving the infection after longer periods in culture. An additional T-lymphocyte line was derived from the spleens of athymic mice that had received the first line and had resolved the infection. These T cells were also capable of inducing resolution of the infection. Lastly, this cell line was treated with specific antibody and complement to delete either CD4+ or CD8+ T lymphocytes in an attempt to enrich for T-cell subpopulations prior to transfer into infected athymic mice. The anti-CD4-treated line was essentially depleted of CD4 cells, while the anti-CD8-treated line was only partially enriched for CD4 cells, with a large proportion of CD8 cells still present. Nude mice that received either of the treated T-cell lines or the parental cell line were capable of resolving the infection, although the line with increased numbers of CD4 cells was more efficient than either the parental line or the CD8 line.

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Selected References

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