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  2. Tangeretin attenuates lipopolysaccharide-induced acute lung injury through Notch signaling pathway via suppressing Th17 cell response in mice

Tangeretin attenuates lipopolysaccharide-induced acute lung injury through Notch signaling pathway via suppressing Th17 cell response in mice

  • Microb Pathog. 2020 Jan;138:103826. doi: 10.1016/j.micpath.2019.103826.
Mengqin Li 1 Yan Zhao 2 Di Qi 2 Jing He 2 Daoxin Wang 3
Affiliations

Affiliations

  • 1 Department of Respiratory and Critical Care Medicine, The Second Affiliated Hospital of Chongqing Medical University, China; Department of Emergency, The Affiliated Hospital of North Sichuan Medical College, China.
  • 2 Department of Respiratory and Critical Care Medicine, The Second Affiliated Hospital of Chongqing Medical University, China.
  • 3 Department of Respiratory and Critical Care Medicine, The Second Affiliated Hospital of Chongqing Medical University, China. Electronic address: wangdaoxin11@163.com.
Abstract

Tangeretin, a polymethoxylated flavonoid is abundant in citrus fruits, which has been reported to inhibit inflammation by inhibiting NF-κB activation and proinflammatory cytokines. Notch blockage inhibits Th17 cells response that are involved in the development of acute lung injury (ALI). This study investigated the protective effects of tangeretin on LPS-induced ALI in mice. Male C57BL/6 mice were treated with phosphate-buffered saline (PBS), lipopolysaccharide (LPS), LPS and tangeretin, or LPS and N-[N-(3,5-difluorophenacetyl)-l-alanyl]-S-phenylglycine t-butyl ester (DAPT, a Notch signaling inhibitor), which were harvested at 48 h after challenged by LPS. CD4+ T cells were treated with tangeretin or DAPT and harvested after 72 h. Tangeretin notably attenuated pathological changes and decreased the wet to dry weight ratio of the mouse lungs. The total cell and neutrophil counts, tumor necrosis factor (TNF)-α in bronchoalveolar lavage fluid (BALF), myeloperoxidase activity of lung tissue were markedly reduced by tangeretin. The percentage of CD4+IL-17 + T cells in the lungs and the concentration of interleukin (IL)-17 and IL-22 in BALF were significantly down-regulated by tangeretin. As with the positive control (DAPT), tangeretin inhibited the activity of the Notch signaling pathway accompanied with the down-regulation of acid-related orphan receptor gamma t and IL-23 Receptor expression. This study demonstrated that tangeretin protects against LPS-induced ALI by suppressing Th17 response at least partially, through a Notch-dependent mechanism.

Keywords

Acute lung injury; IL-23R; Notch; RORγt; Tangeretin; Th17.

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