Abstract
Purpose
Patients in whom neutropenia recovery is complicated by pneumonia have an increased risk of acute lung injury (ALI) and detrimental outcomes. The aim of the present study was to investigate whether inhibition of neutrophil elastase (NE) is effective in lipopolysaccharide (LPS)-induced ALI during neutropenia recovery in a murine model, and whether it upregulates the activation of the MerTK signaling pathway.
Methods
Cyclophosphamide was given to mice to induce neutropenia. Seven days later, they were administered LPS by intratracheal instillation. Sivelestat, a neutrophil elastase inhibitor, was given by intraperitoneal injection once daily starting on day 0 and continuing until mice were sacrificed on day 5 (preventive group). Alternatively, sivelestat was given after, instead of before, LPS administration on day 2 (therapeutic group).
Results
Sivelestat attenuated the lung edema and histopathological changes associated with LPS-induced lung injury. The accumulation of neutrophils and the concentrations of TNF-α, IL-6, and MPO in bronchoalveolar lavage (BAL) fluids were inhibited effectively by sivelestat. The expression of ICAM-1 and NF-κB p65 was also reduced after sivelestat administration. The protein and gene expression of MerTK tended to increase with sivelestat treatment.
Conclusions
Sivelestat significantly attenuated LPS-induced ALI during recovery from neutropenia, and this effect was associated with MerTK induction. These findings suggest that NE inhibition could be a promising means of alleviating lung inflammation without increasing susceptibility to infection in ALI/ARDS during neutropenia recovery.
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J. M. Lee and C. D. Yeo contributed equally to this work.
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Lee, J.M., Yeo, C.D., Lee, H.Y. et al. Inhibition of neutrophil elastase contributes to attenuation of lipopolysaccharide-induced acute lung injury during neutropenia recovery in mice. J Anesth 31, 397–404 (2017). https://doi.org/10.1007/s00540-017-2311-9
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DOI: https://doi.org/10.1007/s00540-017-2311-9