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Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons
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T-type Ca(2+) channel modulation by otilonium bromide.

Peter R Strege1, Lei Sha, Arthur Beyder

  • 1Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota 55905, USA.

American Journal of Physiology. Gastrointestinal and Liver Physiology
|March 6, 2010
PubMed
Summary
This summary is machine-generated.

Otilonium bromide, an antispasmodic, inhibits T-type calcium channels, potentially explaining its effectiveness in treating gastrointestinal disorders. This study reveals a new mechanism for antispasmodic action beyond blocking L-type channels.

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Area of Science:

  • Pharmacology
  • Molecular Biology
  • Gastroenterology

Background:

  • Antispasmodics manage gastrointestinal disorders by inhibiting smooth muscle contraction.
  • L-type calcium channels are primary regulators of smooth muscle contraction, but T-type calcium channels also play a role.
  • Otilonium bromide is an antispasmodic known to inhibit L-type calcium channels and colonic contractility.

Purpose of the Study:

  • To investigate whether otilonium bromide also inhibits T-type calcium channels.
  • To explore a potential new mechanism of action for antispasmodics.

Main Methods:

  • Patch-clamp technique was used to record whole-cell currents.
  • HEK293 cells expressing T-type calcium channel alpha subunits (CaV3.1, CaV3.2, CaV3.3) were utilized.
  • Cells were exposed to varying concentrations of otilonium bromide (10⁻⁸ to 10⁻⁵ M).

Main Results:

  • Otilonium bromide demonstrated reversible inhibition of all tested T-type calcium channels (CaV3.1, CaV3.2, CaV3.3).
  • The drug exhibited a higher affinity for CaV3.3 compared to CaV3.1 and CaV3.2.
  • Otilonium bromide also slowed the inactivation of CaV3.1 and CaV3.3 channels.

Conclusions:

  • Inhibition of T-type calcium channels by otilonium bromide may contribute to its antispasmodic effect.
  • This action on T-type channels represents a novel mechanism for antispasmodics.
  • This finding could explain the enhanced clinical efficacy of otilonium bromide compared to selective L-type channel blockers.