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• W2035532914 abstract "The cellular mechanisms of vasorelaxant effects of newly synthesized KMUP-3 and KMUP-4 were investigated in rat aortic smooth muscle (RASM). KMUP-3 (7-[2-[4-(4-nitrobenzene)piperazinyl]ethyl]-1,3-dimethylxanthine) and KMUP-4 (7-[2-[4-(2-nitrobenzene)piperazinyl]ethyl]-1,3-dimethylxanthine) elicited concentration-dependent relaxation of endothelium-intact and denuded RASM precontracted with phenylephrine. Relaxant responses were also produced by the PDE inhibitors theophylline, milrinone, rolipram, and zaprinast (1 nM-100 μM). The relaxant responses of KMUP-3 and KMUP-4 were reduced by endothelium removal and by the presence of the NOS inhibitor L-NAME (100 μM), the sGC inhibitor ODQ (1 μM), the adenylyl cyclase (AC) inhibitor SQ 22536 (100 μM), and the prostaglandin inhibitor indomethacin (10 μM). Additionally, the vasorelaxations of both agents were also attenuated by pretreatment with the nonselective K+ channel blocker TEA (10 mM), the KATP channel blocker glibenclamide (1 μM), the voltage-dependent K+ (KV) channel blocker 4-AP (100 μM), and Ca2+-dependent K+ (KCa) channel blockers apamin (1 μM) and charybdotoxin (ChTX, 0.1 μM). In addition, elevated extracellular K+ (80 mM) interferes with KMUP-3- and KMUP-4-induced vasorelaxations. Preincubation with both agents (1 μM) significantly enhanced the dilator responses of isoproterenol and SNP. KMUP-3 and KMUP-4 inhibited PDE activities and increased cAMP and cGMP levels in primary culture of RASM that were inhibited by SQ 22536 and ODQ, respectively. In cultured HUVECs, KMUP-3 and KMUP-4 (0.1 μM), more potent than YC-1, significantly increased the expression of eNOS protein. In summary, KMUP-3 and KMUP-4 induce aortic relaxations through both endothelium-dependent and -independent mechanisms. Mechanisms of vasorelaxation induced by both compounds involve multiple processes, such as accumulation of cyclic nucleotides partly as a result of PDE inhibition, K+-channel activation, and indomethacin-sensitive endothelium function." @default.
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• W2035532914 date "2005-11-01" @default.
• W2035532914 modified "2023-10-17" @default.
• W2035532914 title "Aortic Smooth Muscle Relaxants KMUP-3 and KMUP-4, Two Nitrophenylpiperazine Derivatives of Xanthine, Display cGMP-Enhancing Activity" @default.
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• W2035532914 doi "https://doi.org/10.1097/01.fjc.0000180900.32489.f9" @default.
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