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Amiodarone is a potent calmodulin antagonist.

P Nokin1, J P Blondiaux, P Schaeffer

  • 1Sanofi-Labaz Research Center, Brussels, Belgium.

Naunyn-Schmiedeberg'S Archives of Pharmacology
|April 1, 1989
PubMed
Summary

Amiodarone, an antiarrhythmic drug, was found to be a potent calmodulin antagonist. It inhibited calmodulin-activated enzymes and directly interacted with calmodulin, affecting its fluorescence.

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Area of Science:

  • Biochemistry
  • Pharmacology
  • Molecular Biology

Background:

  • Calmodulin (CaM) is a crucial calcium-binding protein involved in regulating numerous cellular processes.
  • Amiodarone is a widely used antiarrhythmic and antianginal medication with a complex mechanism of action.

Purpose of the Study:

  • To investigate the potential interaction between amiodarone and calmodulin.
  • To determine if amiodarone modulates the activity of calmodulin-dependent enzymes.

Main Methods:

  • Assessing amiodarone's effect on Ca2+/calmodulin-activated cyclic nucleotide phosphodiesterase (CaM-PDE).
  • Evaluating amiodarone's impact on CaM-activated (Ca2+ + Mg2+)-ATPase from human erythrocytes.
  • Measuring direct amiodarone-calmodulin interaction using fluorescence spectroscopy with 9-anthroylcholine (9AC).

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Main Results:

  • Amiodarone did not affect basal CaM-PDE or (Ca2+ + Mg2+)-ATPase activities.
  • Amiodarone competitively inhibited calmodulin-activation of aortic CaM-PDE (Ki = 650 nM) and erythrocyte (Ca2+ + Mg2+)-ATPase (IC50 = 4.5 microM).
  • Amiodarone reduced the fluorescence of 9AC bound to calmodulin (IC50 = 5 microM), indicating direct binding.

Conclusions:

  • Amiodarone acts as a potent calmodulin antagonist.
  • The drug's interaction with calmodulin may contribute to its pharmacological effects.
  • These findings elucidate a novel mechanism of amiodarone action at the molecular level.