Abstract
Objective and design
Toll-like receptor 4 (TLR4) plays important roles in the recognition of lipopolysaccharide (LPS) and the activation of inflammatory cascade. In this study, we evaluated the effect of TAK-242, a selective TLR4 signal transduction inhibitor, on acute lung injury (ALI).
Materials and methods
C57BL/6J mice were intravenously treated with TAK-242 15 min before the intratracheal administration of LPS or Pam3CSK4, a synthetic lipopeptide. Six hours after the challenge, bronchoalveolar lavage fluid was obtained for a differential cell count and the measurement of cytokine and myeloperoxidase levels. Lung permeability and nuclear factor-κB (NF-κB) DNA binding activity were also evaluated.
Results
TAK-242 effectively attenuated the neutrophil accumulation and activation in the lungs, the increase in lung permeability, production of inflammatory mediators, and NF-κB DNA-binding activity induced by the LPS challenge. In contrast, TAK-242 did not suppress inflammatory changes induced by Pam3CSK4.
Conclusion
TAK-242 may be a promising therapeutic agent for ALI, especially injuries associated with pneumonia caused by Gram-negative bacteria.
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Acknowledgments
We thank Miyuki Yamamoto of Keio University School of Medicine and Masumi Uekata of Takeda Pharmaceutical Co. Ltd. for their technical assistance. This study was supported in part by a grant-in-aid for scientific research from the Ministry of Health, Labour and Welfare of Japan (no. 19590913) (S. T.).
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Seki, H., Tasaka, S., Fukunaga, K. et al. Effect of Toll-like receptor 4 inhibitor on LPS-induced lung injury. Inflamm. Res. 59, 837–845 (2010). https://doi.org/10.1007/s00011-010-0195-3
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DOI: https://doi.org/10.1007/s00011-010-0195-3