Abstract:
:We examined the effects of the benzoylguanidine derivative HOE 694, an inhibitor of Na(+)-H+ exchange, against veratrine-induced diastolic contractures and action potentials recorded in rat isolated left atria. Concentration-dependent protective effects against veratrine-contractures, in the absence of negative inotropic responses, were observed with HOE 694 (IC50 = 20.1(7.6-27.0) microM, n = 24) and with the chemically related amiloride derivatives DMA, EIPA, HMA and MIA, but not with amiloride itself. Concomitant Na(+)-H+ exchange blockade by a high concentration of amiloride (100 microM) failed to significantly modify the protective effects of HOE 694. HOE 694 decreased Vmax significantly at 10 microM (166.7 +/- 21 vs 154.7 +/- 20 V/s, P < 0.05, n = 6) without any effect on resting potential or action potential duration. High concentrations (100 microM) of HOE 694 further decreased Vmax and increased action potential duration. The protective effects of HOE 694 were compared with three of the class 1 antiarrhythmic agents, quinidine, lidocaine and flecainide against veratrine contracture. These Na+ channel blockers exerted protective effects in the same range of concentrations as HOE 694. Our findings demonstrate that HOE 694 prevents veratrine contractures at concentrations which presumably affect Na(+)-H+ exchange. However, the mechanism by which HOE 694 affords protection is apparently mediated by class 1-type Na+ channel blockade.
journal_name
Fundam Clin Pharmacoljournal_title
Fundamental & clinical pharmacologyauthors
Le Grand B,Marty A,Talmant JM,John GWdoi
10.1111/j.1472-8206.1996.tb00602.xsubject
Has Abstractpub_date
1996-01-01 00:00:00pages
467-73issue
5eissn
0767-3981issn
1472-8206pii
0767398196839867journal_volume
10pub_type
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