Abstract
Mycoplasma pneumoniae (Mp) may cause immune cell reactions as pivotal aspects of this clinically common respiratory pathogen. Our aim is to determine if Mp extract induces a cellular immune response associated with interleukin (IL)-17, leading to lung inflammation and lung injury. BALB/c mice were immunized with Mp extract intraperitoneally followed by its intratracheal administration, to mimic repeated Mp infection found in humans (repeated inoculation, RI group). Those with a single inoculation were compared as single inoculation group (SI group). Analysis of bronchoalveolar lavage fluid (BALF) demonstrated that keratinocyte-derived cytokine, tumor necrosis factor-α, and IL-6 were produced and peaked on days 0.5 or 1, followed by IL-17 on day 2. Levels of these mediators in BALF were higher in RI group than SI group (P < 0.05). Further, significantly more neutrophils were recruited to the lungs of the RI group (P < 0.05). These observations suggest that IL-17 is involved in the prolonged induction of neutrophils in mice treated with Mp extract.
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This research was partially supported by the Japanese Ministry of Education, Science, Sports and Culture Grants-in-Aid for Scientific Research of 2007, 1959091, and 2009, 21591298.
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Kurai, D., Nakagaki, K., Wada, H. et al. Mycoplasma pneumoniae Extract Induces an IL-17-Associated Inflammatory Reaction in Murine Lung: Implication for Mycoplasmal Pneumonia. Inflammation 36, 285–293 (2013). https://doi.org/10.1007/s10753-012-9545-3
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DOI: https://doi.org/10.1007/s10753-012-9545-3