Selectivity of linopirdine (DuP 996), a neurotransmitter release enhancer, in blocking voltage-dependent and calcium-activated potassium currents in hippocampal neurons.

Linopirdine [DuP 996, 3, 3-bis(4-pyridinylmethyl)-1-phenylindolin-2-one], a putative cognition enhancing drug, increases acetylcholine release in rat brain tissue and improves performance in animal models of learning and memory. The mechanism whereby linopirdine enhances acetylcholine release has been proposed to involve inhibition of the M-type K+ current (IM). Our study examines the selectivity of linopirdine for IM by determining its effects on other ionic currents present in rat hippocampal CA1 neurons using patch clamp techniques. Linopirdine was found to block voltage-gated, calcium-activated and leak K+ currents in a dose-dependent manner. Of the seven currents measured, linopirdine was most selective for IM with an IC50 of 2.4 +/- 0.4 microM, followed by IC (measured as a medium afterhyperpolarization tail current, ImAHP) with an IC50 of 16.3 +/- 2.4 microM. Both IM and IC were completely suppressed by linopirdine. At a concentration of 100 microM, linopirdine weakly inhibited the K+ leak current, IL, the transient outward current, IA, the delayed rectifier, IK, and the slow component of IAHP, by 28 +/- 8, 37 +/- 10, 36 +/- 9 and 52 +/- 10 percent, respectively. The mixed Na+/K+ inward rectifying current, IQ, was essentially unaffected by linopirdine (IC50 >300 microM). These results indicate that linopirdine selectively blocks IM at concentrations </= 3 microM, the approximate EC50 for acetylcholine release enhancement. Inhibition of other voltage-gated and calcium-activated K+ currents could also contribute to enhanced neurotransmitter release by linopirdine at intermediate (IC) and high (IL, IA, IK, IsAHP) concentrations.

• Publication year

  1998

• Venue

  Journal of Pharmacology and Experimental Therapeutics

• Publication date

  1998-08-01

• Fields of study

  Medicine, Chemistry

• Identifiers
  DOI 10.1016/s0022-3565(24)37644-xPMID 9694925
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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