Abstract:
:Baicalin, a flavonoid monomer derived from Scutellaria baicalensis called Huangqin in mandarin, is the main active ingredient contributing to S. baicalensis' efficacy. It is known in China that baicalin has potential therapeutic effects on inflammatory diseases. However, its anti-inflammatory mechanism has still not been fully interpreted. We aim to investigate the anti-inflammatory effect of baicalin on lipopolysaccharide (LPS)-induced inflammation in HBE16 airway epithelial cells and also to explore the underlying signaling mechanisms. The anti-inflammatory action of baicalin was evaluated in human airway epithelial cells HBE16 treated with LPS. Airway epithelial cells HBE16 were pretreated with a range of concentrations of baicalin for 30 min and then stimulated with 10 μg/ml LPS. The secretions of interleukin-6 (IL-6), interleukin-8 (IL-8), and tumor necrosis factor-α (TNF-α) in cell culture supernatants were quantified by enzyme-linked immunosorbent assay (ELISA). The messenger RNA (mRNA) expressions of IL-6, IL-8, and TNF-α were tested by quantitative real-time polymerase chain reaction (real-time RT-PCR). Furthermore, Western blotting was used to determine whether the signaling pathway NF-κB was involved in the anti-inflammatory action of baicalin. The inflammatory cell model was successfully built with 10 μg/ml LPS for 24 h in our in vitro experiments. Both the secretions and the mRNA expressions of IL-6, IL-8, and TNF-α were significantly inhibited by baicalin. Moreover, the expression levels of phospho-IKKα/β and phospho-NF-κB p65 were downregulated, and the phospho-IκB-α level was upregulated by baicalin. These findings suggest that the anti-inflammatory properties of baicalin may be resulted from the inhibition of IL-6, IL-8, and TNF-α expression via preventing signaling NF-κB pathway in HBE16 airway epithelial cells. In addition, this study provides evidence to understand the therapeutic effects of baicalin on inflammatory diseases in clinical practice.
journal_name
Inflammationjournal_title
Inflammationauthors
Dong SJ,Zhong YQ,Lu WT,Li GH,Jiang HL,Mao Bdoi
10.1007/s10753-015-0124-2subject
Has Abstractpub_date
2015-08-01 00:00:00pages
1493-501issue
4eissn
0360-3997issn
1573-2576journal_volume
38pub_type
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