Differential sensitivity of myeloid and lymphoid cell populations to apoptosis in peritoneal cavity of mice with model larval Mesocestoides vogae infection

Abstract

SummaryThe metacestode stage of the tapeworm Mesocestoides vogae (M. vogae) has the ability of asexual growth in the peritoneal cavity of rodents and other intermediate hosts without restriction. Early immunological events have decisive role in the establishment of infection. In the present study we investigated the kinetic of myeloid and lymphoid cell populations and the proportions of cells undergoing apoptosis in peritoneal cavities of mice within the first month after oral infection with M. vogae larvae. Proportions of cell phenotypes and apoptotic cells were examined by flow cytometry and by microscopical analysis of cells following May/Grünwald staining and fluorescent stain Hoechst 33234, respectively. Total numbers of peritoneal cells increased and their distribution changed towards accumulation of myelo-monocytic cell lineage in the account of reduced proportions of lymphoid cells. CD4+ T cell subpopulations were more abundant than CD8+ and their proportions elevated within two weeks post infection (p.i.) which was followed by a significant decline. Expression level of CD11c marker on myelo-monocytic cells revealed phenotype heterogeneity and proportions of cells with low and medium expression elevated from day 14 p.i. along with concurrent very low presence of CD11chigh phenotype. Lymphoid cell population was highly resistant to apoptosis but elevated proportions of myeloid cells were in early/late stage of apoptosis. Apoptosis was detected in a higher number of adherent cells from day 14 p.i. onwards as evidenced by nuclear fluorescent staining. By contrast, cells adherent to larvae, mostly macrophages and eosinophils, did not have fragmented nuclei. Our data demonstrated that apoptosis did not account for diminished population of peritoneal lymphoid cells and substantial proportions of myeloid cells seem to be more susceptible to apoptotic turnover in peritoneal cavity of mice with ongoing M. vogae infection, suggesting their important role in the host-parasite interactions.

Cellular and humoral peritoneal immunity to Mesocestoides vogae metacestode infection in mice

“…Moreover, we found that M. vogae infection influenced the expression of F4/80 and MHC II markers on the myeloid peritoneal cell population. Recently, we showed that peritoneal myeloid cells undergo apoptosis in response to M. vogae infection [ 33 ] and that ES products can directly inhibit the activation of antigen presenting cells [ 34 ], which may mediate immunosuppression. The alternation of MHC II and F4/80 expression levels in PEC demonstrates the complex network of interactions and regulatory mechanisms that occur during an experimental infection.…”

Cellular and humoral peritoneal immunity to Mesocestoides vogae metacestodes infection in mice.

“…Moreover, we found that M. vogae infection in uenced the expression of F4/80 and MHC II markers on the myeloid peritoneal cell population. Recently, we showed that peritoneal myeloid cells undergo apoptosis in response to M. vogae infection [33] and that ES products can directly inhibit the activation of antigen presenting cells [34], which may mediate immunosuppression. The alternation of MHC II and F4/80 expression levels in PEC demonstrates the complex network of interactions and regulatory mechanisms that occur during an experimental infection.…”