Abstract
7-[2-[4-(2-chlorophenyl)piperazinyl]ethyl]-1,3-dimethylxanthine (KMUP-1) produces tracheal relaxation, intracellular accumulation of cyclic nucleotides, inhibition of phosphodiesterases (PDEs) and activation of K+ channels. KMUP-1 (0.01-100 microm) induced concentration-dependent relaxation responses in guinea-pig epithelium-intact trachea precontracted with carbachol. Relaxation responses were also elicited by the PDE inhibitors theophylline, 3-isobutyl-1-methylxanthine (IBMX), milrinone, rolipram and zaprinast (100 microm), and a KATP channel opener, levcromakalim. Tracheal relaxation induced by KMUP-1 was attenuated by epithelium removal and by pretreatment with inhibitors of soluble guanylate cyclase (sGC) (1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ), 1 microm), nitric oxide synthase (Nomega-nitro-L-arginine methyl ester, 100 microm), K+ channels (tetraethylammonium, 10 mm), KATP channels (glibenclamide, 1 microm), voltage-dependent K+ channels (4-aminopyridine, 100 microm) and Ca2+-dependent K+ channels (charybdotoxin, 0.1 microm or apamin, 1 microm). Both KMUP-1 (10 microm) and theophylline nonselectively and slightly inhibited the enzyme activity of PDE3, 4 and 5, suggesting that they are able to inhibit the metabo...Continue Reading
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