Effects of baicalin on alveolar fluid clearance and α-ENaC expression in rats with LPS-induced acute lung injury

• Published in: Canadian journal of physiology and pharmacology 2017-02, Vol.95 (2), p.122-128
• Main Authors: Deng, Jia, Wang, Dao-xin, Liang, Ai-ling, Tang, Jing, Xiang, Da-kai
• Format: Article
• Language: English
• Subjects: acute lung injury; Acute Lung Injury - chemically induced; Acute Lung Injury - metabolism; Acute Lung Injury - physiopathology; Acute respiratory distress syndrome; Adenylyl Cyclase Inhibitors - pharmacology; alveolar fluid clearance; Animals; Anti-Inflammatory Agents, Non-Steroidal - antagonists & inhibitors; Anti-Inflammatory Agents, Non-Steroidal - pharmacology; baicalin; baicaline; canaux sodiques de la membrane apicale des cellules épithéliales; Carbazoles - pharmacology; Cells, Cultured; clairance du liquide alvéolaire; Cyclic AMP - metabolism; Dose-Response Relationship, Drug; Edema - complications; Edema - drug therapy; Edema - physiopathology; Epithelial Cells - metabolism; Epithelial Cells - physiology; epithelial sodium channel; Epithelial Sodium Channels - metabolism; Flavonoids - antagonists & inhibitors; Flavonoids - pharmacology; Flavonoids - therapeutic use; Gene expression; Genetic aspects; Health aspects; Ionomycin - pharmacology; Lipopolysaccharides; Lung - drug effects; Lung - metabolism; Lung - physiopathology; lésion pulmonaire aiguë; Male; Mice; Protein Kinase Inhibitors - pharmacology; Pyrroles - pharmacology; Rats; Sodium channels; Water - metabolism
• ISSN: 0008-4212; 1205-7541
• DOI: 10.1139/cjpp-2016-0212

Baicalin has been reported to attenuate lung edema in the process of lung injury. However, the effect of baicalin on alveolar fluid clearance (AFC) and epithelial sodium channel (ENaC) expression has not been tested. Sprague-Dawley rats were anesthetized and intratracheally injected with either 1 mg/kg lipopolysaccharide (LPS) or saline vehicle. Baicalin with various concentrations (10, 50, and 100 mg/kg) was injected intraperitoneally 30 min before administration of LPS. Then lungs were isolated for measurement of AFC, cyclic adenosine monophosphate (cAMP) level, and cellular localization of α-ENaC. Moreover, mouse alveolar type II (ATII) epithelial cell line was incubated with baicalin (30 μmol/L), adenylate cyclase inhibitor SQ22536 (10 μmol/L), or cAMP-dependent protein kinase inhibitor (PKA) KT5720 (0.3 μmol/L) 15 min before LPS (1 μg/mL) incubation. Protein expression of α-ENaC was detected by Western blot. Baicalin increased cAMP concentration and AFC in a dose-dependent manner in rats with LPS-induced acute lung injury. The increase of AFC induced by baicalin was associated with an increase in the abundance of α-ENaC protein. SQ22536 and KT5720 prevented the increase of α-ENaC expression caused by baicalin in vitro. These findings suggest that baicalin prevents LPS-induced reduction of AFC by upregulating α-ENaC protein expression, which is activated by stimulating cAMP/PKA signaling pathway.