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Interaction of ropivacaine with cloned cardiac Kv4.3/KChIP2.2 complexes

Patrick Friederich1, Anna Solth

  • 1Department of Anesthesiology, University Hospital Hamburg Eppendorf, Germany. patrick.friederich@zmnh.uni-hamburg.de

Anesthesiology
|November 27, 2004
PubMed
Abstract

Insights

S(-)-ropivacaine inhibits human Kv4.3/KChIP2.2 channels, which are crucial for cardiac function. This local anesthetic action may worsen heart function during intoxication, highlighting its potential cardiac risks.

Area of Science:

  • Cardiovascular Pharmacology
  • Molecular Cardiology
  • Ion Channel Physiology

Background:

  • Local anesthetics can prolong the QTc interval and induce arrhythmias by inhibiting cardiac K+ channels.
  • The transient outward potassium current (Ito) is a key target for bupivacaine toxicity.
  • S(-)-ropivacaine, a safer alternative to bupivacaine, has not been studied for its effects on Ito.

Purpose of the Study:

  • To investigate the effects of S(-)-ropivacaine on human Kv4.3/KChIP2.2 channels, which form the Ito current in ventricular myocardium.

Main Methods:

  • Human Kv4.3/KChIP2.2 complementary DNA was transfected into Chinese hamster ovary cells.
  • The patch clamp technique was employed to assess the pharmacologic effects of S(-)-ropivacaine.

Main Results:

  • S(-)-ropivacaine demonstrated concentration-dependent, stereospecific, and reversible inhibition of Kv4.3/KChIP2.2 channels.
  • The IC50 for charge inhibition was 117 ± 21 μM, and for current decline acceleration was 77 ± 11 μM.
  • S(-)-ropivacaine altered channel gating by shifting activation midpoint and slowing recovery from inactivation, with Kv4.3 channels being more sensitive.

Conclusions:

  • S(-)-ropivacaine blocks Kv4.3/KChIP2.2 channels from the open state, interfering with KChIP2.2's gating modulation.
  • Inhibition of these channels by S(-)-ropivacaine may impair cardiac function during intoxication.

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