Powerful technique to test selectivity of agents acting on cardiac ion Channels

The action potential voltage-clamp

N. Szentandrássy, D. Nagy, F. Ruzsnavszky, G. Harmati, T. Bányász, J. Magyar, A. J. Szentmiklósi, P. Nánási

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Action potential voltage-clamp (APVC) is a technique to visualize the profile of various currents during the cardiac action potential. This review summarizes potential applications and limitations of APVC, the properties of the most important ion currents in nodal, atrial, and ventricular cardiomyocytes. Accordingly, the profiles ("fingerprints") of the major ion currents in canine ventricular myocytes, i.e. in cells of a species having action potential morphology and set of underlying ion currents very similar to those found in the human heart, are discussed in details. The degree of selectivity of various compounds, which is known to be a critical property of drugs used in APVC experiments, is overviewed. Thus the specificity of agents known to block sodium (tetrodotoxin, saxitoxin), potassium (chromanol 293B, HMR 1556, E-4031, dofetilide, sotalol, 4-aminopyridine, BaCl 2), calcium (nifedipine, nisolpidine, nicardipine, diltiazem, verapamil, gallopamil), and chloride (anthracene-9-carboxylic acid, DIDS) channels, the inhibitor of the sodium-calcium exchanger (SEA0400), and the activator of sodium current (veratridine) are accordingly discussed. Based on a theory explaining how calcium current inhibitors block calcium channels, the structural comparison of the studied substances usually confirmed the results of the literature. Using these predictions, a hypothetical super-selective calcium channel inhibitor structure was designed. APVC is a valuable tool not only for studying the selectivity of the known ion channel blockers, but is also suitable for safety studies to exclude cardiac ion channel actions of any agent under development.

Original languageEnglish
Pages (from-to)3737-3756
Number of pages20
JournalCurrent Medicinal Chemistry
Volume18
Issue number24
DOIs
Publication statusPublished - Aug 2011

Fingerprint

Clamping devices
Ion Channels
Action Potentials
Electric potential
Calcium Channels
Ions
Sodium
Sodium-Calcium Exchanger
Saxitoxin
Gallopamil
Veratridine
4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid
Calcium
Sotalol
Nicardipine
4-Aminopyridine
Diltiazem
Tetrodotoxin
Nifedipine
Verapamil

Keywords

  • Action potential
  • Action potential voltage-clamp
  • Calcium channel
  • Chemical structure
  • Ion channel blocker
  • Ion current
  • Selective calcium channel blocker

ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmacology

Cite this

Powerful technique to test selectivity of agents acting on cardiac ion Channels : The action potential voltage-clamp. / Szentandrássy, N.; Nagy, D.; Ruzsnavszky, F.; Harmati, G.; Bányász, T.; Magyar, J.; Szentmiklósi, A. J.; Nánási, P.

In: Current Medicinal Chemistry, Vol. 18, No. 24, 08.2011, p. 3737-3756.

Research output: Contribution to journalArticle

Szentandrássy, N. ; Nagy, D. ; Ruzsnavszky, F. ; Harmati, G. ; Bányász, T. ; Magyar, J. ; Szentmiklósi, A. J. ; Nánási, P. / Powerful technique to test selectivity of agents acting on cardiac ion Channels : The action potential voltage-clamp. In: Current Medicinal Chemistry. 2011 ; Vol. 18, No. 24. pp. 3737-3756.
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