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- Title
Shoseiryuto Promotes the Formation of a Tight-Junction Barrier in Cultured Human Bronchial Epithelial Cells.
- Authors
Lu, Jingya; Hu, Ailing; Yamaguchi, Takuji; Tabuchi, Masahiro; Ikarashi, Yasushi; Kobayashi, Hiroyuki
- Abstract
Shoseiryuto (SST) (Xiao-Qing-Long-Tang in Chinese) is an effective treatment for respiratory diseases, such as bronchial asthma and allergic rhinitis, but its effects on the bronchial tight-junction (TJ) barrier have not been clarified. This study aimed to evaluate the effect of SST on TJ-barrier function in human bronchial epithelial (16HBE) cells. The 16HBE cells were cultured in a culture medium without (control) and with SST in the absence and presence of bacterial endotoxin lipopolysaccharide (LPS) in transwell chambers. Transepithelial electrical resistance (TEER) and sodium fluorescein (Na-F) permeability of the cultured-cell monolayer were measured as TJ integrity markers. In addition, immunofluorescence staining and quantitative real-time polymerase chain reaction analysis were used to measure the expression of the TJ protein, occludin. SST increased TEER and decreased Na-F permeability of the 16HBE cell monolayers. Furthermore, SST increased both occludin mRNA and immunostained protein expressions, suggesting that SST has the effect of directly promoting epithelial TJ-barrier function. LPS decreased TEER, increased Na-F permeability, and decreased both occludin mRNA and protein expression. LPS-induced barrier dysfunction was completely blocked by pre/co- and posttreatment with SST. These results suggest that SST has protective and therapeutic effects against LPS-induced TJ-barrier damage. To our knowledge, these are the first results to demonstrate the protective and therapeutic effects conferred by TJ-barrier promoting, which may be a novel mechanism contributing to the efficacy of SST for respiratory diseases.
- Subjects
HERBAL medicine; CELL culture; STAINS &; staining (Microscopy); PERMEABILITY; GENE expression; CELL communication; BRONCHI; BIOELECTRIC impedance; FLUORESCENT antibody technique; MESSENGER RNA; EPITHELIAL cells; MEMBRANE proteins; POLYMERASE chain reaction; CHINESE medicine
- Publication
Evidence-based Complementary & Alternative Medicine (eCAM), 2023, p1
- ISSN
1741-427X
- Publication type
Article
- DOI
10.1155/2023/4694243