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Mycoplasma pneumoniae is one of the causative agents of atypical community-acquired pneumonia. Tigecycline belongs to a new class of glycylcycline antimicrobials that have activity against a wide range of microorganisms, including in vitro activity againstM. pneumoniae . We investigated the effect of tigecycline on microbiologic, histologic, and immunologic indices in a murine model ofM. pneumoniae pneumonia. BALB/c mice were inoculated intranasally withM. pneumoniae and treated subcutaneously with tigecycline or placebo for 6 days. Outcome variables included quantitative bronchoalveolar lavage (BAL)M. pneumoniae culture, lung histopathologic score (HPS), BAL cytokine and chemokine concentrations (tumor necrosis factor alpha [TNF-α], gamma interferon [IFN-γ], interleukin 1β [IL-1β], IL-2, IL-4, IL-5, IL-6, IL-10, IL-12 [p40/p70], granulocyte-macrophage colony-stimulating factor, MIP-1α, MIG, KC, MCP-1, and IP-10). BALM. pneumoniae concentrations in mice treated with tigecycline (MpTige) tended to be reduced compared with mice treated with placebo (MpPl); however this did not reach statistical significance. The lung HPS was significantly lower, as well as the parenchymal-pneumonia subscore, in the MpTige mice than in the MpPl mice. MpTige mice had significantly lower BAL cytokine concentrations of IL-1β, IL-12 (p40/p70), IFN-γ, and TNF-α; of the chemokines, MIG, MIP-1α, and IP-10 were statistically lower in MpTige mice. While tigecycline treatment demonstrated a modest microbiologic effect, it significantly improved lung histologic inflammation and reduced pulmonary cytokines and chemokines.

antimicrobial agents and chemotherapy

Tigecycline Therapy Significantly Reduces the Concentrations of Inflammatory Pulmonary Cytokines and Chemokines in a Murine Model of <i>Mycoplasma pneumoniae</i> Pneumonia

Tigecycline Therapy Significantly Reduces the Concentrations of Inflammatory Pulmonary Cytokines and Chemokines in a Murine Model of Mycoplasma pneumoniae Pneumonia