Helicobacter pylori has stimulatory effects on naive T cells

TY - JOUR

T1 - Helicobacter pylori has stimulatory effects on naive T cells

AU - Malfitano, A M

AU - Cahill, R

AU - Mitchell, P

AU - Frankel, G

AU - Dougan, G

AU - Bifulco, M

AU - Lombardi, G

AU - Lechler, R I

AU - Bamford, K B

PY - 2006/2

Y1 - 2006/2

N2 - Background: Despite an apparently active host response, Helicobacter pylori infection can persist for life. Unexpectedly, T cells from apparently uninfected individuals respond to H. pylori antigen by proliferating. Also, the T-cell proliferative response appears to be less in infected compared with uninfected individuals. Materials and Methods: We have investigated the T-cell response of isolated human peripheral blood, naive, and memory CD4(+) T cells to H. pylori antigen in infected and uninfected subjects. Results: In agreement with previous findings, the peripheral blood proliferative response was higher in uninfected compared with infected subjects. Interestingly, there was a response in CD4(+)CD45RO(+) (memory) and CD4(+)CD45RA(+) (naive) subsets. The RO/RA ratio of the response to H. pylori antigen was 0.8-2.1 in both H. pylori-positive and H. pylori-negative subjects, which was similar to that of a known superantigen (2.5 and 2.2 in Helicobacter-positive and -negative subjects, respectively) whereas the RO/RA response ratio to a recall antigen (tetanus toxoid) was 9.8 and 18.7 in Helicobacter-positive and -negative subjects, respectively. Mononuclear cells isolated from cord blood also responded to H. pylori antigen, whereas there was no response to tetanus toxoid. The cord blood response and CD4(+)CD45RA(+) cell response to H. pylori antigen were inhibited predominantly by anti-HLA-DR and to some extent by anti-HLA-DQ antibodies. Investigation of the response to five different recombinant H. pylori antigens identified two that produced a response in naive T cells. Conclusions: These data suggest that H. pylori possesses molecules that cause higher than expected proliferation of naive T cells

AB - Background: Despite an apparently active host response, Helicobacter pylori infection can persist for life. Unexpectedly, T cells from apparently uninfected individuals respond to H. pylori antigen by proliferating. Also, the T-cell proliferative response appears to be less in infected compared with uninfected individuals. Materials and Methods: We have investigated the T-cell response of isolated human peripheral blood, naive, and memory CD4(+) T cells to H. pylori antigen in infected and uninfected subjects. Results: In agreement with previous findings, the peripheral blood proliferative response was higher in uninfected compared with infected subjects. Interestingly, there was a response in CD4(+)CD45RO(+) (memory) and CD4(+)CD45RA(+) (naive) subsets. The RO/RA ratio of the response to H. pylori antigen was 0.8-2.1 in both H. pylori-positive and H. pylori-negative subjects, which was similar to that of a known superantigen (2.5 and 2.2 in Helicobacter-positive and -negative subjects, respectively) whereas the RO/RA response ratio to a recall antigen (tetanus toxoid) was 9.8 and 18.7 in Helicobacter-positive and -negative subjects, respectively. Mononuclear cells isolated from cord blood also responded to H. pylori antigen, whereas there was no response to tetanus toxoid. The cord blood response and CD4(+)CD45RA(+) cell response to H. pylori antigen were inhibited predominantly by anti-HLA-DR and to some extent by anti-HLA-DQ antibodies. Investigation of the response to five different recombinant H. pylori antigens identified two that produced a response in naive T cells. Conclusions: These data suggest that H. pylori possesses molecules that cause higher than expected proliferation of naive T cells

U2 - 10.1111/j.0083-8703.2006.00374.x

DO - 10.1111/j.0083-8703.2006.00374.x

M3 - Article

VL - 11

SP - 21

EP - 30

JO - HELICOBACTER

JF - HELICOBACTER

IS - 1

ER -