Protective effects of different anti‑inflammatory drugs on tracheal stenosis following injury and potential mechanisms

Huang,Zhenjie; Wei,Peng; Gan,Luoman; Li,Wentao; Zeng,Tonghua; Qin,Caicheng; Chen,Zhiyu; Liu,Guangnan

doi:10.3892/mmr.2021.11953

Protective effects of different anti‑inflammatory drugs on tracheal stenosis following injury and potential mechanisms

Authors:
- Zhenjie Huang
- Peng Wei
- Luoman Gan
- Wentao Li
- Tonghua Zeng
- Caicheng Qin
- Zhiyu Chen
- Guangnan Liu
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Affiliations: Department of Respiratory Medicine, Second Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530007, P.R. China, School of Medicine, Qinghai University, Xining, Qinghai 810000, P.R. China, Department of Respiratory Medicine, Beihai People's Hospital, Beihai, Guangxi 536000, P.R. China
Published online on: March 2, 2021 https://doi.org/10.3892/mmr.2021.11953
Article Number: 314
Copyright: © Huang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Tracheal stenosis following injury cannot be effectively treated. The current study compared the protective effects of different anti‑inflammatory drugs on tracheal stenosis and investigated their possible mechanisms. Rabbit tracheal stenosis models following injury were constructed and confirmed using hematoxylin and eosin (H&E) staining. A total of 30 rabbits were divided into the control (CON), penicillin (PEN), erythromycin (ERY), budesonide (BUD) and PEN + ERY + BUD groups (n=6). Stenotic tracheal tissue, serum and bronchoalveolar lavage fluid (BALF) were collected 10 days after continuous treatment. Pathological changes in the tracheas were observed by H&E staining. Histone deacetylase 2 (HDAC2) expression in tracheal tissues was detected by immunofluorescence. Immunohistochemistry was performed to detect collagen I (Col‑I) and collagen III (Col‑III) levels in tracheal tissues. Transforming growth factor β1 (TGF‑β1), vascular endothelial growth factor (VEGF) and interleukin 8 (IL‑8) levels in serum and BALF samples were determined using ELISA kits. Western blotting detected HDAC2, IL‑8, TGF‑β1 and VEGF levels in tracheal tissues. H&E staining demonstrated that tracheal epithelial hyperplasia and fibroblast proliferation in the ERY and PEN + ERY + BUD groups markedly improved compared with the CON group. Furthermore, in tracheal tissues, HDAC2 expression was significantly increased and IL‑8, TGF‑β1, VEGF, Col‑I and Col‑III levels were significantly decreased in the ERY and PEN + ERY + BUD groups compared with the CON group. Additionally, the results for the PEN + ERY + BUD were more significant compared with the ERY group. In serum and BALF samples, IL‑8, TGF‑β1 and VEGF levels in the ERY and PEN + ERY + BUD groups were significantly lower compared with the CON group, with the results of the PEN + ERY + BUD group being more significant compared with the ERY group. There were no significant differences between the PEN, BUD and CON groups. ERY inhibited tracheal granulation tissue proliferation and improved tracheal stenosis following injury and synergistic effects with PEN and BUD further enhanced these protective effects. The mechanism may involve HDAC2 upregulation and inhibition of local airway and systemic inflammatory responses.

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