CD4(+) T cells have been shown to be essential for
vaccine-induced protection against Helicobacter pylori
infection in mice. Less is known about the relative contributions of individual cell subpopulations, such as T(h)1 and T(h)17 cells, and their associated
cytokines. The aim of the present study was to find immune correlates to
vaccine-induced protection and further study their role in protection against H. pylori
infection. Immunized and unimmunized mice were challenged with H. pylori, and immune responses were compared.
Vaccine-induced protection was assessed by measuring H. pylori colonization in the stomach. Gastric gene expression of T(h)1- and/or T(h)17-associated
cytokines was analyzed by quantitative PCR, and contributions of individual
cytokines to protection were evaluated by antibody-mediated in vivo neutralization. By analyzing immunized and unimmunized mice, a significant inverse correlation between the levels of interleukin-12p40 (IL-12p40),
tumor necrosis factor alpha (TNF),
gamma interferon (IFN-γ), and
IL-17 gene expression and the number of H. pylori bacteria in the stomachs of individual animals after challenge could be demonstrated. In a kinetic study, upregulation of TNF, IFN-γ, and
IL-17 coincided with
vaccine-induced protection at 7 days after H. pylori challenge and was sustained for at least 21 days. In vivo neutralization of these
cytokines during the effector phase of the immune response revealed a significant role for
IL-17, but not for IFN-γ or TNF, in
vaccine-induced protection. In conclusion, although both T(h)1- and T(h)17-associated gene expression in the stomach correlate with
vaccine-induced protection against H. pylori
infection, our study indicates that mainly T(h)17 effector mechanisms are of critical importance to protection.