Abstract：
:3-alpha-Methyl substituted digitoxigenin-3-beta-glucoside (methyl-dtg-gluc) displays unusual features, e.g. a high dissociation rate constant from its binding site leading to rapid reversibility of the inotropic and toxic effects, and a flat dose-response curve attaining higher inotropic maxima thus indicating an increased therapeutic index in animal experiments. In order to check whether or not methyl-dtg-gluc is specifically bound to the same receptors as classic cardiac glycosides we compared binding of ouabain and of methyl-dtg-gluc to guinea-pig heart muscle homogenate. For both compounds specific binding required the addition of ATP (2.5 mM). The binding curve for ouabain yielded half maximum binding at 1.3 x 10(-7) M and maximum number of binding sites of 6 pmole/mg protein; the corresponding values for methyl-dtg-gluc amounted to 1.4 x 10(-6) M and 6 pmole/mg protein, respectively. A mutual competition could be demonstrated between the two compounds. Since the provided data are equilibrium values they do not exclude higher turnover rates of methyl-dtg-gluc in comparison with ouabain at a given glycoside-ATPase complex concentration which can be expected from the fast dissociation rate constant of the methyl-dtg-gluc-ATPase complex. The results are briefly discussed with respect to the molecular mole of action of cardiac glycosides.
journal_name
Biochem Pharmacoljournal_title
Biochemical pharmacologyauthors
Lüllmann H,Mohr Kdoi
10.1016/0006-2952(82)90059-4subject
Has Abstractpub_date
1982-08-01 00:00:00pages
2489-94issue
15eissn
0006-2952issn
1873-2968pii
0006-2952(82)90059-4journal_volume
31pub_type
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