Obtusifolin isolated from the seeds of Cassia obtusifolia regulates the gene expression and production of MUC5AC mucin in airway epithelial cells via affecting NF‐κB pathway

author Byung‐Soo Choi, Yu‐jin Kim, Jae Sue Choi, Hyun Jae Lee, Choong Jae Lee
his workplace 1Department of Pharmacology, School of Medicine Chungnam National University Daejeon Korea 2 Department of Food Science and Nutrition Pukyong National University Busan Korea 3 Smith Liberal Arts College and Department of Addiction Science, Graduate School Sahmyook University Seoul Korea
periodicalPhytotherapy Research, 2019, Vol.33 (4), pp.919-928
sourceWiley Journal
key word Airway; Mucin; Obtusifolin;
Original abstractWe investigated whether obtusin, obtusifolin, and cassiaside isolated from the seeds of Cassia obtusifolia inhibit the gene expression and production of airway mucin 5AC (MUC5AC). Confluent NCI‐H292 cells were pretreated with obtusin, obtusifolin, or cassiaside for 30 min and then stimulated with epidermal growth factor (EGF), phorbol 12‐myristate 13‐acetate (PMA), or tumor necrosis factor‐α (TNF‐α) for 24 hr. The MUC5AC mucin gene expression was measured by reverse transcription‐polymerase chain reaction. Production of MUC5AC mucin protein was measured by enzyme‐linked immunosorbent assay. To elucidate the action mechanism of obtusifolin, effect of obtusifolin on PMA‐induced nuclear factor kappa B (NF‐κB) signaling pathway was investigated by western blot analysis. Obtusin, obtusifolin, or cassiaside inhibited the expression of MUC5AC mucin gene and the production of MUC5AC mucin protein, induced by EGF, PMA, or TNF‐α. Obtusifolin inhibited PMA‐induced activation (phosphorylation) of inhibitory kappa B kinase, and thus phosphorylation and degradation of inhibitory kappa B alpha. Obtusifolin inhibited PMA‐induced nuclear translocation of NF‐κB p65. These results suggest that obtusifolin can regulate the production and gene expression of mucin by acting on airway epithelial cells through regulation of NF‐κB signaling pathway.
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