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Volume 155, Issue 12

Development of a non-invasive murine infection model for acute otitis media Free

Abstract

Otitis media (OM) is one of the most frequent diseases in childhood, and is among the main causative bacterial agents. Since current experimental models used to study the bacterial pathogenesis of OM have several limitations, such as the invasiveness of the experimental procedures, we developed a non-invasive murine OM model. In our model, adapted from a previously developed rat OM model, a pressure cabin is used in which a 40 kPa pressure increase is applied to translocate pneumococci from the nasopharyngeal cavity into both mouse middle ears. Wild-type pneumococci were found to persist in the middle ear cavity for 144 h after infection, with a maximum bacterial load at 96 h. Inflammation was confirmed at 96 and 144 h post-infection by IL-1 and TNF- cytokine analysis and histopathology. Subsequently, we investigated the contribution of two surface-associated pneumococcal proteins, the streptococcal lipoprotein rotamase A (SlrA) and the putative proteinase maturation protein A (PpmA), to experimental OM in our model. Pneumococci lacking the gene, but not those lacking the gene, were significantly reduced in virulence in the OM model. Importantly, pneumococci lacking both genes were significantly more attenuated than the Δ single mutant. This additive effect suggests that SlrA and PpmA exert complementary functions during experimental OM. In conclusion, we have developed a highly reproducible and non-invasive murine infection model for pneumococcal OM using a pressure cabin, which is very suitable to study pneumococcal pathogenesis and virulence .

  • Received:
  • Accepted:
  • Revised:
  • Published Online:
Keyword(s): AOM, acute otitis media , CI, competitive index , IL, interleukin , OM, otitis media , PPIase, peptidyl-prolyl isomerase and TNF, tumour necrosis factor
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2009-12-01
2024-04-19
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Development of a non-invasive murine infection model for acute otitis media
Microbiology 155, 4135 (2009); https://doi.org/10.1099/mic.0.033175-0
/content/journal/micro/10.1099/mic.0.033175-0
/content/journal/micro/10.1099/mic.0.033175-0
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