Abstract
Arctigenin, a lignan extract from Arctium lappa (L.), exhibits anti-inflammation, antioxidation, vasodilator effects, etc. However, the effects of arctigenin on bronchus relaxation are not well investigated. This study aimed to investigate how arctigenin regulates bronchus tone and calcium ion (Ca2+) flow. Trachea strips of guinea pigs were prepared for testing the relaxation effect of arctigenin to acetylcholine, histamine, KCl, and CaCl2, respectively. Furthermore, l-type calcium channel currents were detected by patch–clamp, and intracellular Ca2+ concentration was detected by confocal microscopy. The results showed that arctigenin exhibited relaxation effect on tracheae to different constrictors, and this was related to decreasing cytoplasmic Ca2+ concentration by inhibiting Ca2+ influx partly through l-type calcium channel as well as promoting Ca2+ efflux. In summary, this study provides new insight into the mechanisms by which arctigenin exhibits relaxation effect on bronchus and suggests its potential use for airway disease therapy.
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Acknowledgments
This study was financially supported by grants from the National Nature Science Fund (NNSF) of China (no. 81173638, 81373506) and the Ministry of Education Doctoral Fund (no. 20120031110042), Key Teacher Training Project of Heilongjiang Province (1155G61), and Chinese Postdoctoral Fund (20080440687). We appreciate the valuable comments from other members of our laboratories.
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The authors declare that they have no conflict of interest.
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Zhenying Zhao and Yongqiang Yin contributed equally to this article.
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Zhao, Z., Yin, Y., Wang, Z. et al. Arctigenin Exhibits Relaxation Effect on Bronchus by Affecting Transmembrane Flow of Calcium. Biol Trace Elem Res 156, 181–187 (2013). https://doi.org/10.1007/s12011-013-9839-9
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DOI: https://doi.org/10.1007/s12011-013-9839-9