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DOI: 10.1055/s-0035-1546242
Inhibition of COX-2 and NF-κB1 Gene Expression, NO Production, 5-LOX, and COX-1 and COX-2 Enzymes by Extracts and Constituents of Onopordum acanthium
Publication History
received 29 December 2014
revised 24 May 2015
accepted 01 June 2015
Publication Date:
18 September 2015 (online)
![](https://www.thieme-connect.de/media/plantamedica/201514/lookinside/thumbnails/10-1055-s-0035-1546242_pmy1421-1.jpg)
Abstract
The present study focused on the investigation of the inhibition of cyclooxygenase-2 and nuclear factor kappa B1 gene expression, nitric oxide production, leukotriene biosynthesis (5-lipoxygenase), and cyclooxygenase-1 and cyclooxygenase-2 enzymes of Onopordum acanthium, and the isolation and identification of its active compounds. From the chloroform soluble part of the MeOH extract prepared from aerial parts, lignans [pinoresinol (1), syringaresinol (2), and medioresinol (3)] and flavonoids [hispidulin (4), nepetin (5), apigenin (6), and luteolin (7)] were isolated by a combination of different chromatographic methods. The structures of the compounds were determined by means of mass spectrometry and 1D- and 2D-nuclear magnetic resonance spectroscopy, and by comparison of the spectral data with literature values. Extracts of different polarity and the isolated compounds obtained from the aerial parts, together with those previously isolated from the roots of the plant [4β,15-dihydro-3-dehydrozaluzanin C (8), zaluzanin C (9), 4β,15,11β,13-tetrahydrozaluzanin C (10), nitidanin diisovalerianate (11), 24-methylenecholesterol (12), and 13-oxo-9Z,11E-octadecadienoic acid (13)], were evaluated for their inhibitory effects on cyclooxygenase-2 and nuclear factor kappa B1 gene expression, inducible nitric oxide synthase, 5-lipoxygenase, and cyclooxygenase-1 and cyclooxygenase-2 enzymes in in vitro assays. It was found that O. acanthium extracts exert strong inhibitory activities in vitro and some lignans, flavonoids, and sesquiterpenes may play a role in these activities. 4β,15-Dihydro-3-dehydrozaluzanin C and zaluzanin C at 20 µM were the most active constituents tested against lipopolysaccharide/interferon-γ-induced nitric oxide production (100.4 ± 0.5 % and 99.4 ± 0.8 %) in the inhibition of cyclooxygenase-2 (98.6 ± 0.2 % and 97.0 ± 1.1 %) and nuclear factor kappa B1 gene expression (76.7 ± 7.3 % and 69.9 ± 3.4 %). Furthermore, it was shown that these inhibitory effects are not due to cytotoxicity of the compounds.
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