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  • Title: Identification of Chlamydia trachomatis Antigens Recognized by T Cells From Highly Exposed Women Who Limit or Resist Genital Tract Infection.
    Author: Russell AN, Zheng X, O'Connell CM, Wiesenfeld HC, Hillier SL, Taylor BD, Picard MD, Flechtner JB, Zhong W, Frazer LC, Darville T.
    Journal: J Infect Dis; 2016 Dec 15; 214(12):1884-1892. PubMed ID: 27738051.
    Abstract:
    BACKGROUND:  Natural infection induces partial immunity to Chlamydia trachomatis Identification of chlamydial antigens that induce interferon γ (IFN-) secretion by T cells from immune women could advance vaccine development. METHODS:  IFN-γ production by CD4+ and CD8+ peripheral blood T cells from 58 high-risk women was measured after coculture with antigen-presenting cells preincubated with recombinant Escherichia coli expressing a panel of 275 chlamydial antigens. Quantile median regression analysis was used to compare frequencies of IFN-γ responses in women with only cervical infection to those in women with endometrial infection and frequencies in women who remained uninfected for over 1 year to those in women who developed incident infection. Statistical methods were then used to identify proteins associated with protection. RESULTS:  A higher median frequency of CD8+ T-cell responses was detected in women with lower genital tract chlamydial infection, compared with those with upper genital tract chlamydial infection (13.8% vs 9.5%; P =04), but the CD4+ T-cell response frequencies were not different. Women who remained uninfected displayed a greater frequency of positive CD4+ T-cell responses (29% vs 18%; P < .0001), compared with women who had incident infection, while the frequencies of CD8+ T-cell responses did not differ. A subset of proteins involved in central metabolism, type III secretion, and protein synthesis were associated with protection. CONCLUSIONS:  Investigations in naturally exposed women reveal protective responses and identify chlamydial vaccine candidate antigens.
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