Loganin attenuates intestinal injury in severely burned rats by regulating the toll‑like receptor 4/NF‑κB signaling pathway

Wen,Hailing; Xing,Liang; Sun,Kui; Xiao,Changshuan; Meng,Xiangxi; Yang,Jingzhe

doi:10.3892/etm.2020.8725

Loganin attenuates intestinal injury in severely burned rats by regulating the toll‑like receptor 4/NF‑κB signaling pathway

Authors:
- Hailing Wen
- Liang Xing
- Kui Sun
- Changshuan Xiao
- Xiangxi Meng
- Jingzhe Yang
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Affiliations: Department of Burns and Plastic Surgery, Affiliated Hospital of Chengde Medical University, Chengde, Hebei 067000, P.R. China, Department of Burns and Plastic Surgery, The First Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
Published online on: May 7, 2020 https://doi.org/10.3892/etm.2020.8725
Pages: 591-598

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Abstract

Severe burns may lead to intestinal inflammation and oxidative stress, resulting in intestinal barrier damage and gut dysfunction. Loganin, an iridoid glycoside compound, has been isolated from Cornus officinalis Sieb. et Zucc; however, its role in the treatment of burn injury is yet to be fully elucidated. Therefore, the present study examined the effect of loganin administration on burn‑induced intestinal inflammation and oxidative stress after severe burns in male Sprague‑Dawley rats. Histological injury was assessed by hematoxylin and eosin staining. Furthermore, cytokine expression in intestinal tissues was measured by ELISA and reverse transcription‑quantitative PCR. Antioxidative activities were assessed by determining the levels of reactive oxygen species (ROS), superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GSH‑Px) and malondialdehyde (MDA). Apoptosis was detected by flow cytometry. Apoptosis‑related proteins, toll‑like receptor 4 (TLR4) protein and NF‑κB translocation were examined by western blotting. Immunohistochemical staining was used to observe TLR4 and NF‑κB p65 expression in intestinal tissues. The present study suggested that loganin administration significantly reduced burn injury‑induced intestinal histological changes, tumor necrosis factor‑α, interleukin (IL)‑6 and IL‑1β production and oxidative stress, evidenced by decreased ROS levels and MDA content (P<0.05). Furthermore, loganin increased SOD, CAT and GSH‑Px levels and intestinal epithelial cell apoptosis. Loganin treatment also significantly inhibited activation of the TLR4/NF‑κB signaling pathway in the intestine of severely burned rats (P<0.05). In conclusion, loganin reduced burns‑induced intestinal inflammation and oxidative stress, potentially by regulating the TLR4/NF‑κB signaling pathway.

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