Polymorphonuclear Neutrophils Are Necessary for the Recruitment of CD8+T Cells in the Liver in a Pregnant Mouse Model ofChlamydophila abortus(Chlamydia psittaciSerotype 1) Infection

Abstract

The role of polymorphonuclear neutrophils (PMNs) in the development of the specific immune response againstChlamydophila abortus(Chlamydia psittaciserotype 1) infection was studied in a pregnant mouse model involving treatment with RB6-8C5 monoclonal antibody. PMN depletion significantly affected the immune response in the liver, in which the T-lymphocyte and F4/80⁺cell populations decreased, particularly the CD8⁺T-cell population. A Th1-like response, characterized by high levels of gamma interferon without detectable levels of interleukin 4 (IL-4) in serum, was observed in both depleted and nondepleted mice, although an increased production of IL-10 was detected in the depleted group. Our results suggest that PMNs play a very important role in the recruitment of other leukocyte populations to the inflammatory foci but have little influence in the polarization of the immune specific response toward a Th1-like response.