Septicaemia models using Streptococcus pneumoniae and Listeria monocytogenes: understanding the role of complement properdin

Aline Dupont, Fatima Mohamed, Nur'Ain Salehen, Sarah Glenn, Lorenza Francescut, Rozita Adib, Simon Byrne, Hannah Brewin, Irina Elliott, Luke Richards, Petya Dimitrova, Wilhelm Schwaeble, Nina Ivanovska, Aras Kadioglu, Lee Machado, Peter W Andrew, Cordula Stover

Research output: Contribution to JournalArticlepeer-review


Streptococcus pneumoniae and Listeria monocytogenes, pathogens which can cause severe infectious disease in human, were used to infect properdin-deficient and wildtype mice. The aim was to deduce a role for properdin, positive regulator of the alternative pathway of complement activation, by comparing and contrasting the immune response of the two genotypes in vivo. We show that properdin-deficient and wildtype mice mounted antipneumococcal serotype-specific IgM antibodies, which were protective. Properdin-deficient mice, however, had increased survival in the model of streptococcal pneumonia and sepsis. Low activity of the classical pathway of complement and modulation of FcγR2b expression appear to be pathogenically involved. In listeriosis, however, properdin-deficient mice had reduced survival and a dendritic cell population that was impaired in maturation and activity. In vitro analyses of splenocytes and bone marrow-derived myeloid cells support the view that the opposing outcomes of properdin-deficient and wildtype mice in these two infection models is likely to be due to a skewing of macrophage activity to an M2 phenotype in the properdin-deficient mice. The phenotypes observed thus appear to reflect the extent to which M2- or M1-polarised macrophages are involved in the immune responses to S. pneumoniae and L. monocytogenes. We conclude that properdin controls the strength of immune responses by affecting humoral as well as cellular phenotypes during acute bacterial infection and ensuing inflammation.
Original languageEnglish
Pages (from-to)257–271
Number of pages15
JournalMedical Microbiology and Immunology
Issue number4
Early online date12 Apr 2014
Publication statusPublished - 1 Aug 2014


  • Complement
  • Fc receptor
  • bacterial infection
  • dendritic cells
  • macrophages
  • mouse model


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