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Possible role of cyclic AMP in the relaxation process of mammalian heart: Effects of dibutyryl cyclic AMP and theophylline on potassium contractures in cat papillary muscles

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Summary

The effect of dibutyryl cyclic AMP (DB-c-AMP; 3×10−4–3×10−3 M) on electrically induced twitch and high potassium (142.4 mM KCl)-induced contracture tension was studied in papillary muscles from normal and reserpinized cats ([Ca]0 1.8 mM; 25°C; pH 7.4). In both groups of preparations, the increase in twitch tension evoked by DB-c-AMP was accompanied by an abbreviation of the time to peak force and of relaxation time. In the same preparations, the high potassium contracture was markedly depressed by DB-c-AMP in a concentration-dependent manner. Similar results were obtained with the N6-monobutyryl derivative of cyclic AMP.

The relaxing effects of the cyclic nucleotides on KCl contractures did not appear to be due to possible non-cyclic breakdown products: adenosine; 5′-AMP and sodium butyrate did not attenuate contracture tension at concentrations up to 3×10−3 M. The same applies to ATP and non-cyclic N6-2′-O-3′-O-tributyryl-adenosine-monophosphate. Theophylline (10−2 M) was found to prolong the relaxation time of the twitch and to enhance the high KCl contracture.

It is concluded that cyclic AMP may be capable of modulating the relaxation process of mammalian heart and that not only the positive inotropic but also the relaxant effects of catecholamines on myocardium described before may be mediated by the cyclic AMP system. The relaxant effects of cyclic AMP derivatives on intact myocardial preparations are attributed to a stimulation by cyclic AMP of the calcium transport of the sarcoplasmic reticulum (SR) and are interpreted to be a corollary to the effects of cyclic AMP previously obtained on isolated SR preparations.

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  1. Pharmakologisches Institut der Universität Mainz, Obere Zahlbacher Strasse 67, D-6500, Mainz, Germany

    Thomas Meinertz, Hermann Nawrath & Hasso Scholz

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  1. Thomas Meinertz
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  2. Hermann Nawrath
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  3. Hasso Scholz
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Meinertz, T., Nawrath, H. & Scholz, H. Possible role of cyclic AMP in the relaxation process of mammalian heart: Effects of dibutyryl cyclic AMP and theophylline on potassium contractures in cat papillary muscles. Naunyn-Schmiedeberg's Arch. Pharmacol. 293, 129–137 (1976). https://doi.org/10.1007/BF00499217

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