Carnosic acid protects against lipopolysaccharide‑induced acute lung injury in mice

Li,Quan; Liu,Ling; Sun,Haijun; Cao,Kunyue

doi:10.3892/etm.2019.8042

Carnosic acid protects against lipopolysaccharide‑induced acute lung injury in mice

Authors:
- Quan Li
- Ling Liu
- Haijun Sun
- Kunyue Cao
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Affiliations: Intensive Care Unit, Suqian First Hospital, Suqian, Jiangsu 223800, P.R. China, Intensive Care Unit, Zhongda Hospital Southeast University, Nanjing, Jiangsu 210009, P.R. China
Published online on: September 23, 2019 https://doi.org/10.3892/etm.2019.8042
Pages: 3707-3714
Copyright: © Li et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY_NC 4.0].

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Abstract

Acute respiratory distress syndrome is a well‑known inflammatory disease associated with high rates of morbidity and mortality due to a lack of effective treatment methods. Carnosic acid (CA) is a phenolic diterpene compound that serves a central role in cytoprotective responses to inflammation. In the present study, the protective mechanism of CA on acute lung injury (ALI) induced by lipopolysaccharide (LPS) was investigated. Mice were randomly assigned to the following five groups: Control group, LPS group, and LPS plus CA groups (at 10, 20 and 40 mg/kg doses). Following pre‑treatment with vehicle or CA,ALI was induced by the administration of LPS. At 6 h after LPS treatment, mice were sacrificed and lung tissues were harvested for histologic analysis and the determination of wet‑to‑dry ratio, myeloperoxidase activity and toll‑like receptor 4 (TLR4) and NF‑κB expression. Additionally, the levels of interleukin (IL)‑1β, IL‑6 and tumor necrosis factor‑α (TNF‑α) were determined in bronchoalveolar lavage fluid (BALF) and lung tissues, as well as the rate of apoptosis of the isolated neutrophils from BALF. The alleviation of LPS‑induced ALI by CA was confirmed by histologic results and a reduction in the wet‑to‑dry ratio of lung tissues. Additionally, CA was revealed to significantly suppress the inhibitory effect of LPS on neutrophil apoptosis and the promoting effects of LPS on IL‑1β, IL‑6, TNF‑α, TLR4 and NF‑κB expression, and NF‑κB phosphorylation. The current results indicated that CA protects against LPS‑induced ALI via a mechanism that inhibits inflammation.

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