Abstract:
:The effects of Zizyphi fructus, a major constituent of Chinese anti-asthmatic herbal medicine, on ciliary motility and nitric oxide (NO) generation in canine cultured tracheal epithelium were studied by the microphoto-oscillation method and the specific amperometric method, respectively. Addition of Zizyphi fructus at 100 micrograms/mL rapidly increased ciliary beat frequency (CBF), an effect that was inhibited by NG-nitro-L-arginine methylester (L-NAME) but not by NG-nitro-D-arginine methylester (D-NAME), and this inhibition was reversed by L-arginine but not by D-arginine. Immersion of the NO-selective electrode in the medium bathing tracheal epithelial cells showed a baseline current of 21.3-60.4 pA, which corresponded to NO concentration ([NO]) at 34.4 +/- 7.8 nM. Zizyphi fructus caused a concentration-dependent increase in [NO], the maximal increase from the baseline [NO] level and the concentration of Zizyphi fructus required to produce a half-maximal effect (EC50) being 107 +/- 14 nM (p < .001) and 7.2 +/- 2.9 micrograms/mL, respectively. These results suggest that Zizyphi fructus enhances airway ciliary motility and that this effect is exerted through the stimulation of epithelial NO generation.
journal_name
Exp Lung Resjournal_title
Experimental lung researchauthors
Tamaoki J,Kondo M,Tagaya E,Takemura K,Konno Kdoi
10.3109/01902149609031774subject
Has Abstractpub_date
1996-05-01 00:00:00pages
255-66issue
3eissn
0190-2148issn
1521-0499journal_volume
22pub_type
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journal_title:Experimental lung research
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