T-independent IFNγ and B cells synergize to prevent mortality associated with disseminated Chlamydia muridarum genital infection

• Published in: The Journal of immunology (1950) 2018-05, Vol.200 (1_Supplement), p.117-117.6
• Main Authors: Poston, Taylor, O’Connell, Catherine, Girardi, Jenna, Sullivan, Jeanne E., Nagarajan, Uma, Marinov, Anthony, Scurlock, Amy, Darville, Toni
• Format: Article
• Language: English
• ISSN: 0022-1767; 1550-6606
• DOI: 10.4049/jimmunol.200.Supp.117.6

CD4 T cells and antibody are required for optimal acquired immunity to C. muridarum genital tract infection, and T cell-mediated IFNγ production is necessary to clear infection in the absence of humoral immunity. However, the role of protective T cell-independent immune responses against primary infection remain unclear. We addressed this problem by inoculating wild-type and immune-deficient mice with a plaque-purified strain (CM001) isolated from C. muridarum Nigg stock capable of enhanced extragenital replication. Genital CM001 inoculation resulted in transient dissemination to the lungs and spleen in wild-type mice prior to clearance. However, CM001 genital infection induced lethality in STAT1−/− and IFNG−/− mice, where IFNγ signaling is absent, and in Rag1−/− mice that lack T and B cells but are competent for innate IFNγ signaling. In contrast, muMT, nude, and Tcra−/− mice survived. These data collectively indicate that IFNγ prevents lethal CM001 infection in the absence of T cells and suggest a B cell co-requirement for protection. Adoptive transfer of convalescent immune sera, but not naïve IgM antibody, to Rag1−/− mice significantly increased survival time and transfer of naïve B cells completely rescued Rag1−/− mice against CM001 lethality. Protection was associated with a significant reduction in the lung chlamydial burden of genitally infected mice. These data reveal an important synergism between T-independent B cell responses and innate IFNγ in chlamydial host defense, and suggest cooperative interactions between T-independent IgG and IFNγ are essential for limiting extragenital dissemination.