PMID: 1981910Sep 1, 1990

Negative inotropic effect induced by diethylamiloride (DEA) in rabbit myocardium

The Journal of Pharmacy and Pharmacology
M D PerezS Barrigón

Abstract

The effects of the Na+/H+ exchange blocking drug diethylamiloride (DEA) on mechanical function have been studied in the rabbit isolated, arterially perfused interventricular septum. At concentrations of 10(-6)-10(-5) M, DEA induced a significant, dose-dependent, negative inotropic effect (a 54% decrease from control values at the highest concentration), which was slow to develop. After a 45 min washout, recovery was almost complete (95 +/- 3.4%). At concentrations greater than 5 x 10(-5) M, DEA induced a rapid and marked decrease in developed tension, associated with a progressive decrease in excitability and incomplete recovery. Resting tension was not significantly modified at any of the concentrations tested. At greater than 10(-6) M DEA enhanced significantly the transient negative inotropic effect of the brief intracellular acidosis induced by removal of NH4Cl perfusion, both by decreasing the minimal value of developed tension and by increasing the time required to produce this effect. These effects suggest that the dose-dependent DEA negative inotropic effect could be mediated by a progressive intracellular acidosis produced by inhibition of the Na+/H+ exchange system.

References

Feb 1, 1997·Canadian Journal of Physiology and Pharmacology·L PerchenetP Kreher
Oct 2, 2004·The British Journal of Psychiatry : the Journal of Mental Science·Jed BoardmanSasi Willmott

Citations

Sep 1, 1975·The American Journal of Physiology·P A Poole-Wilson, G A Langer
Nov 1, 1976·The Journal of Physiology·D Ellis, R C Thomas
Nov 1, 1989·The Journal of Physiology·C Bountra, R D Vaughan-Jones
Aug 27, 1985·Biochimica Et Biophysica Acta·G N Pierce, K D Philipson
Sep 1, 1981·Bioscience Reports·R Iles
Apr 1, 1981·Physiological Reviews·A Roos, W F Boron

Related Concepts

Myocardial Contraction
Depression, Chemical
5-diethylamiloride
Protoplasm
Myocardium
Metabolic Inhibition
Heart
Interphase Cell
Acidosis
Block Drugs

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