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J Med Chem ; 45(1): 127-36, 2002 Jan 03.
Article in English | MEDLINE | ID: mdl-11754584

ABSTRACT

Several hydroindenic derivatives (7a-methyl-2,3,5,6,7,7a-hexahydro-1H-indenes), bearing an amidinohydrazone at C-5 and different moieties at C-1, have been synthesized and evaluated for their inotropic and chronotropic effects on right- and left-guinea-pig-atria activity. Three of them showed the same profile as digoxin, although with lower potency. The effect on Na(+),K(+)-ATPase (NKA) was also evaluated for these three compounds, observing that two of them, with the same absolute configuration as natural cardenolides, are also NKA inhibitors, while the compound with the opposite configuration lacks such an effect. More interestingly, both active compounds act without affecting the cardiac rhythm. This could be related to the selective inhibition of the human alpha2beta1 isozyme (associated with the inotropic effect) with respect to the alpha1beta1 isozyme (associated with the maintenance of basal ionic levels in the cell and the toxic effect of cardenolides).


Subject(s)
Cardiotonic Agents/chemical synthesis , Hydrazones/chemical synthesis , Indenes/chemical synthesis , Amidines/chemical synthesis , Amidines/chemistry , Amidines/pharmacology , Animals , Biological Transport , Cardiotonic Agents/chemistry , Cardiotonic Agents/pharmacology , Enzyme Inhibitors/chemical synthesis , Enzyme Inhibitors/chemistry , Enzyme Inhibitors/pharmacology , Female , Guinea Pigs , Heart/drug effects , Heart/physiology , Heart Rate , Humans , Hydrazones/chemistry , Hydrazones/pharmacology , In Vitro Techniques , Indenes/chemistry , Indenes/pharmacology , Isoenzymes/metabolism , Male , Myocardial Contraction , Oocytes/metabolism , Rats , Sodium-Potassium-Exchanging ATPase/antagonists & inhibitors , Sodium-Potassium-Exchanging ATPase/metabolism , Transfection , Xenopus laevis
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