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Dexmedetomidine alleviates airway hyperresponsiveness and allergic airway inflammation through the TLR4/NF‑κB signaling pathway in mice

  • Authors:
    • Shilin Xiao
    • Qianyu Wang
    • Huibin Gao
    • Xumin Zhao
    • Juan Zhi
    • Dong Yang

  • View Affiliations

  • Published online on: January 10, 2022     https://doi.org/10.3892/mmr.2022.12590
  • Article Number: 74

  • Copyright: © Xiao et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Dexmedetomidine (DEX) suppresses inflammatory responses and protects against organ injury. The aim of the present study was to investigate the effect of DEX on airway hyperresponsiveness (AHR) and allergic airway inflammation, as well as its underlying mechanism of action in a murine model of ovalbumin (OVA)‑induced asthma. A total of 30 female BALB/c mice were divided into 6 groups (n=5 mice/group): Control, OVA, OVA + DEX (20, 30 or 50 µg/kg) and OVA + TAK‑242 [a toll‑like receptor 4 (TLR4) inhibitor]. The mice were intraperitoneally injected with 20, 30 or 50 µg/kg DEX 1 h before OVA challenge. AHR to inhaled methacholine (Mch) was measured, and the mice were sacrificed 24 h after the last challenge. AHR following Mch inhalation was measured using the FlexiVent apparatus. Hematoxylin and eosin, periodic acid‑Schiff and Wright‑Giemsa staining was performed to evaluate inflammatory cell infiltration in the lung tissue. The levels of IL‑4, IL‑5 and IL‑13 in the bronchoalveolar lavage fluid were analyzed using ELISA, and their mRNA expression levels in the lung tissue were examined using reverse transcription‑quantitative PCR. The protein expression of TLR4, NF‑κB and phosphorylated (p)NF‑κB in the lung tissue was also detected using immunohistochemistry. In the murine OVA‑induced asthma model, DEX decreased AHR following Mch inhalation and reduced the infiltration of inflammatory cells. IL‑4, IL‑5 and IL‑13 levels in the bronchoalveolar lavage fluid were significantly lower following DEX treatment. Furthermore, DEX treatment inhibited the expression of TLR4, NF‑κB and p‑NF‑κB in the lung tissue and exhibited a similar effect to TAK‑242 treatment. In conclusion, DEX may attenuate AHR and allergic airway inflammation by inhibiting the TLR4/NF‑κB pathway. These results suggested that DEX may represent a potential anti‑inflammatory agent for the treatment and management of patients with asthma.
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March-2022
Volume 25 Issue 3

Print ISSN: 1791-2997
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Spandidos Publications style
Xiao S, Wang Q, Gao H, Zhao X, Zhi J and Yang D: Dexmedetomidine alleviates airway hyperresponsiveness and allergic airway inflammation through the TLR4/NF‑κB signaling pathway in mice. Mol Med Rep 25: 74, 2022.
APA
Xiao, S., Wang, Q., Gao, H., Zhao, X., Zhi, J., & Yang, D. (2022). Dexmedetomidine alleviates airway hyperresponsiveness and allergic airway inflammation through the TLR4/NF‑κB signaling pathway in mice. Molecular Medicine Reports, 25, 74. https://doi.org/10.3892/mmr.2022.12590
MLA
Xiao, S., Wang, Q., Gao, H., Zhao, X., Zhi, J., Yang, D."Dexmedetomidine alleviates airway hyperresponsiveness and allergic airway inflammation through the TLR4/NF‑κB signaling pathway in mice". Molecular Medicine Reports 25.3 (2022): 74.
Chicago
Xiao, S., Wang, Q., Gao, H., Zhao, X., Zhi, J., Yang, D."Dexmedetomidine alleviates airway hyperresponsiveness and allergic airway inflammation through the TLR4/NF‑κB signaling pathway in mice". Molecular Medicine Reports 25, no. 3 (2022): 74. https://doi.org/10.3892/mmr.2022.12590