Summary
An adenosine A1 receptor agonist R-N6-phenylisopropyladenosine (R-PIA) elicited a pronounced negative inotropic effect with the EC50 value of 0.69 μmol/1 in the presence of a β-adrenoceptor blocking agent bupranolol (0.3 μmol/1) in the isolated ferret papillary muscle. The negative inotropic effect of R-PIA was not associated with changes in cyclic AMP level. Adenosine and other A1 receptor agonists also elicited a negative inotropic effect. DPCPX (1,3-dipropyl-8-cyclopentyl xanthine) antagonized the negative inotropic effect of R-PIA in a competitive manner (pA2 value = 8.4). The inhibitory action of R-PIA was markedly attenuated in the ventricular muscle preparation isolated from ferrets pretreated with pertussis toxin that caused ADP-ribosylation of 39 kDa proteins in the membrane fraction. In the membrane fraction derived from the ferret ventricle, [3H]-DPCPX bound to a single binding site in a saturable and reversible manner with high affinity (Kd value = 1.21±0.41 nmol/l; B max = 12.8±3.02 fmol/mg protein; n = 7). The binding characteristics of [3H]-DPCPX in the rat ventricle (Kd value = 1.51 ±0.09 nmol/l; B max = 12.7±1.47 fmol/mg protein; n = 5) were similar to those in the ferret. On the other hand, the content of Go, a major pertussis toxin-sensitive G protein in the ferret heart, was much higher in the ferret than in the rat ventricle. The present results indicate that adenosine receptors may play an important role in the inhibitory regulation of ventricular contractility in the ferret in contrast to other mammalian species. The signal transduction process subsequent to agonist binding to A1 receptors including the pertussis toxin-sensitive G protein and ion channels may be responsible for the unique inhibitory action of adenosine in this species.
Similar content being viewed by others
References
Asano T, Semba R, Ogasawara N, Kato K (1987) Highly sensitive immunoassay for the α subunit of the GTP-binding protein Go and its regional distribution in bovine brain. J Neurochem 48:1617–1623
Asano T, Shinohara H, Morishita R, Kato K (1990) Immunochemical and immunohistochemical localization of the G protein G11 in rat central nervous tissues. J Biochem 108:988–994
Bauman G, Schrader J, Gerlach E (1981) Inhibitory action of adenosine on histamine- and dopamine-stimulated cardiac contractility and adenylate cyclase in guinea pigs. Circ Res 48:259–266
Böhm M, Brückner R, Hackbarth I, Haubitz B, Linhart R, Meyer W, Schmidt B, Schmitz W, Scholz H (1984) Adenosine inhibition of catecholamine-induced increase in force of contraction in guinea-pig atrial and ventricular heart preparations. Evidence against a cyclic AMP- and cyclic GMP-dependent effect. J Pharmacol Exp Ther 230:483–492
Böhm M, Brückner R, Neumann J, Nose M, Schmitz W, Scholz H (1988) Adenosine inhibits the positive inotropic effect of 3-isobutyl-1-methylxanthine in papillary muscles without effect on cyclic AMP or cyclic GMP. Br J Pharmacol 93:729–738
Boyett MR, Kirby MS, Orchard CH, Roberts A (1988) The negative inotropic effect of acetylcholine on ferret ventricular myocardium. J Physiol (London) 404:613–635
Brückner R, Fenner A, Meyer W, Nobis TM, Schmitz W, Scholz H (1985) Cardiac effects of adenosine and adenosine analogs in guinea-pig atrial and ventricular preparations: evidence against a role of cyclic AMP and cyclic GMP. J Pharmacol Exp Ther 234:766–774
Endoh M (1979) Correlation of cyclic AMP and cyclic GMP levels with changes in contractile force of dog ventricular myocardium during cholinergic antagonism of positive inotropic actions of histamine, glucagon, theophylline and papaverine. Jpn J Pharmacol 29:855–864
Endoh M (1987) Dual inhibition of myocardial function through muscarinic and adenosine receptors in the mammalian heart. J Appl Cardiol 2:213–230
Endoh M, Blinks JR (1984) Effects of endogenous neurotransmitters on calcium transients in mammalian atrial muscle. In: Fleming WW, Langer SZ, Graefe KH, Weiner N (eds) Neuronal and extraneuronal events in autonomic pharmacology. Raven Press, New York, pp 221–230
Endoh M, Honma M (1979) Effects of papaverine and its interaction with isoprenaline and carbachol on the contractile force and cyclic nucleotide levels of the canine ventricular myocardium. Naunyn-Schmiedeberg's Arch Pharmacol 306:241–248
Endoh M, Kushida H, Norota I, Takanashi M (1991) Pharmacological characteristics of adenosine-induced inhibition of dog ventricular contractility: dependence of the pre-existing level of β-adrenoceptor activation. Naunyn-Schmiedeberg's Arch Pharmacol 344:70–78
Endoh M, Maruyama M, Taira N (1983a) Modification by islet-activating protein of direct and indirect inhibitory actions of adenosine on rat atrial contraction in relation to cyclic nucleotide metabolism. J Cardiovasc Pharmacol 5:131–142
Endoh M, Maruyama M, Taira N (1983b) Adenosine-induced changes in rate of beating and cyclic nucleotide levels in rat atria: modification by islet-activating protein. In: Daly JW, Kuroda Y, Phillis JW, Shimizu H, Ui M (eds) Physiology and pharmacology of adenosine derivatives. Raven Press, New York, pp 127–141
Eschenhagen T, Mende U, Nose M, Schmitz W, Scholz H, Warnholtz A, Wüstel J-M (1991) Isoprenaline-induced increase in mRNA levies of inhibitory G-protein α-subunits in rat heart. Naunyn-Schmiedeberg's Arch Pharmacol 343:609–615
Hazeki O, Ui M (1981) Modification by islet-activating protein of receptor-mediated regulation of cyclic AMP accumulation in isolated rat heart cells. J Biol Chem 256:2856–2862
Hiramoto T, Kushida H, Endoh M (1988) Further characterization of the myocardial a-adrenoceptors mediating positive inotropic effects in the rabbit myocardium. Eur J Pharmacol 152:301–310
Kurachi Y, Nakajima T, Sugimoto T (1986) On the mechanism of activation of muscarinic K+ channels by adenosine in isolated atrial cells: involvement of GTP-binding proteins. Pflügers Arch 407:264–274
Laemmli UK (1970) Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature 227:680–685
Linden J, Hollen CE, Patel A (1985) The mechanism by which adenosine and cholinergic agents reduce contractility in rat myocardium. Correlation with cyclic adenosine monophosphate and receptor densities. Circ Res 56:728–735
Löffelholz K, Pappano AJ (1985) The parasympathetic neuroeffector junction of the heart. Pharmacol Rev 37:1–24
Londos C, Cooper DMF, Wolff J (1980) Subclasses of external adenosine receptors. Proc Natl Acad Sci USA 77:2551–2554
Lowry OH, Rosebrough NJ, Farr AL, Randall RJ (1951) Protein measurement with Folin phenol reagent. J Biol Chem 193:265–275
McIvor ME, Orchard CH, Lakkata EG (1988) Dissociation of changes in apparent myofibrillar Ca 2+ sensitivity and twitch relaxation induced by adrenergic cholinergic stimulation in isolated ferret cardiac muscle. J Gen Physiol 92:509–529
Morishita R, Kato K, Asano T (1988) Major pertussis-toxin-sensitive GTP-binding protein of bovine lung: purification, characterization and production of specific antibodies. Eur J Biochem 174:87–94
Pfaffinger PJ, Martin JM, Hunter DD, Nathanson NM, Hille B (1985) GTP-binding proteins couple cardiac muscarinic receptors to a K channel. Nature 317:536–538
Schaffner W, Weissmann C (1973) A rapid sensitive, and specific method for the determination of protein in dilute solution. Anal Biochem 56:502–514
Schrader J, Baumann G, Gerlach E (1977) Adenosine as inhibitor of myocardial effects of catecholamines. Pflügers Arch 372:29–35
Shinohara H, Kato K, Asano T (1992) Differential localization of G proteins, Gi and GO, in the olfactory epithelium and the main olfactory bulb of the rat. Acta Anat 144:167–171
Sternweis PC, Robishaw JD (1984) Isolation of two proteins with high affinity for guanine nucleotides from membranes of bovine brain. J Biol Chem 259:13806–13813
Tawfik-Schlieper H, Klotz K-N, Kreye VAW, Schwabe U (1989) Characterization of the K+-channel-coupled adenosine receptor in guinea pig atria. Naunyn-Schmiedeberg's Arch Pharmacol 340:684–688
Toutant M, Aunis D, Bockaert J, Homburger V, Rouot B (1987) Presence of three pertussis toxin substrates and GOα immunoreactivity in both plasma and granule membranes of chromaffin cells. FEBS Lett 215:339–344
Ui M, Katada T, Murayama T, Kurose H, Yajima M, Tamura M, Nakamura T, Nogimori K (1984) Islet-activating protein, pertussis toxin: a specific uncouples of receptor-mediated inhibition of adenylate cyclase. Adv Cyclic Nucleotide Protein Phosphoryl Res 17:145–151
von der Leyen H, Schmitz W, Scholz H, Scholz J, Lohse MJ, Schwabe U (1989) Effects of 1,3-dipropyl-8-cyclopentylxanthine (DPCPX), a highly selective adenosine receptor antagonist, on force of contraction in guinea-pig atrial and ventricular cardiac preparations. Naunyn-Schmiedeberg's Arch Pharmacol 340:204–209
Author information
Authors and Affiliations
Additional information
Correspondence to M. Endoh at the above address
Rights and permissions
About this article
Cite this article
Endoh, M., Takanashi, M., Norota, I. et al. Pronounced direct inhibitory action mediated by adenosine A1 receptor and pertussis toxin-sensitive G protein on the ferret ventricular contraction. Naunyn-Schmiedeberg's Arch Pharmacol 348, 282–289 (1993). https://doi.org/10.1007/BF00169157
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00169157