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Background    Chlamydia pneumoniae  ( C. pneumoniae)  is pathogenic to humans, by causing pulmonary inflammation or bronchitis in both adolescents and young adults. However, the molecular signals linking  C. pneumoniae  components to inflammation remain elusive. This study was to investigate the effect of Chlamydia-specific Cpn0423 of  C. pneumoniae  on  C. pneumoniae -mediated inflammation.    Results  Cpn0423 was detected outside of  C. pneumoniae  inclusions, which induced production of several cytokines including macrophage inflammatory protein-2 (MIP-2) and interleukins (ILs). Production of the Cpn0423-induced cytokines was markedly reduced in cells pretreated with NOD2-siRNA, but not with negative control oligonucleotides. Mice treated with Cpn0423 through intranasal administration exhibited pulmonary inflammation as evidenced by infiltration of inflammatory cells, increased inflammatory scores in the lung histology, recruitment of neutrophils and increased cytokines levels in the BALF.    Conclusion  Cpn0423 could be sensed by NOD2, which was identified as an essential element in a pathway contributing to the development of  C. pneumoniae  -mediated inflammation.

Hypothetical protein Cpn0423 triggers NOD2 activation and contributes to Chlamydia pneumoniae-mediated inflammation