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- W1988408001 abstract "The effects of cGMP analogues and phosphodiesterase inhibitors were investigated on cAMP and cGMP hydrolysis by cGMP-stimulated phosphodiesterase (cGS-PDE), isolated from a canine heart sinoatrial node-enriched preparation and from the left ventricle. There was no significant difference between the effects of drugs and cGMP analogues on cGS-PDE from the cardiac ventricle and from the sinoatrial node, suggesting that cGS-PDE has similar characteristics in the two tissues, cGMP itself, 8-bromo-cGMP and 2'-deoxy-cGMP had dual effects: at low concentrations, cAMP hydrolysis was stimulated (maximal effect at 10 microM, 100 microM and 100 microM respectively), while at higher concentrations these compounds inhibited cAMP hydrolysis. Monobutyryl-cGMP and dibutyryl-cGMP had only an inhibitory effect on cAMP hydrolysis. Inhibitors of cAMP- or cGMP-selective PDEs, including the cardiotonic drugs rolipram and zaprinast, were not effective inhibitors of cGS-PDE. Cilostamide (a selective inhibitor of cGMP-inhibited PDE). IBMX (nonspecific inhibitor of PDEs) and dipyridamole inhibited basal cGS-PDE hydrolysis of cAMP and cGMP, and their apparent Ki for cAMP hydrolysis was decreased by 5 microM cGMP (from 30, 14 and 18 to 15.7 and 2.6 microM, respectively, for the ventricular enzyme).(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W1988408001 date "1991-01-01" @default.
- W1988408001 modified "2023-09-25" @default.
- W1988408001 title "Cardiac cGMP-stimulated cyclic nucleotide phosphodiesterases: effects of cGMP analogues and drugs" @default.
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- W1988408001 doi "https://doi.org/10.1016/0922-4106(91)90140-d" @default.
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